/usr/bin/java -Xmx16000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/chromosome-trans.wvr.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-770125f [2021-05-22 02:20:53,694 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-22 02:20:53,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-22 02:20:53,733 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-22 02:20:53,793 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe-Separate.epf [2021-05-22 02:20:53,828 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-22 02:20:53,829 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-22 02:20:53,829 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-05-22 02:20:53,829 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-05-22 02:20:53,832 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-22 02:20:53,832 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-22 02:20:53,832 INFO L138 SettingsManager]: * Use SBE=true [2021-05-22 02:20:53,832 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-22 02:20:53,832 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-22 02:20:53,833 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-22 02:20:53,833 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-22 02:20:53,834 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-22 02:20:53,835 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-22 02:20:53,835 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-22 02:20:53,835 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-22 02:20:53,835 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-22 02:20:53,835 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-22 02:20:53,835 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:20:53,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-05-22 02:20:53,836 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-22 02:20:53,837 INFO L138 SettingsManager]: * Check the insufficient thread errors last=true [2021-05-22 02:20:53,837 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-05-22 02:20:54,147 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-22 02:20:54,169 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-22 02:20:54,172 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-22 02:20:54,173 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-05-22 02:20:54,174 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-05-22 02:20:54,174 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/chromosome-trans.wvr.bpl [2021-05-22 02:20:54,175 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/weaver-benchmarks/generated/chl/chromosome-trans.wvr.bpl' [2021-05-22 02:20:54,209 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-22 02:20:54,210 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-22 02:20:54,211 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-05-22 02:20:54,211 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-05-22 02:20:54,211 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-05-22 02:20:54,223 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,231 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,238 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-05-22 02:20:54,240 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-22 02:20:54,240 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-22 02:20:54,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-22 02:20:54,247 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,250 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,250 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,253 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,255 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,256 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... [2021-05-22 02:20:54,257 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-22 02:20:54,258 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-22 02:20:54,258 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-22 02:20:54,258 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-22 02:20:54,260 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-22 02:20:54,327 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread1 given in one single declaration [2021-05-22 02:20:54,327 INFO L130 BoogieDeclarations]: Found specification of procedure thread1 [2021-05-22 02:20:54,327 INFO L138 BoogieDeclarations]: Found implementation of procedure thread1 [2021-05-22 02:20:54,328 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread2 given in one single declaration [2021-05-22 02:20:54,328 INFO L130 BoogieDeclarations]: Found specification of procedure thread2 [2021-05-22 02:20:54,328 INFO L138 BoogieDeclarations]: Found implementation of procedure thread2 [2021-05-22 02:20:54,328 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-05-22 02:20:54,328 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-22 02:20:54,328 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-22 02:20:54,329 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread3 given in one single declaration [2021-05-22 02:20:54,330 INFO L130 BoogieDeclarations]: Found specification of procedure thread3 [2021-05-22 02:20:54,330 INFO L138 BoogieDeclarations]: Found implementation of procedure thread3 [2021-05-22 02:20:54,331 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-05-22 02:20:54,719 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-22 02:20:54,719 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-05-22 02:20:54,721 INFO L202 PluginConnector]: Adding new model chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:20:54 BoogieIcfgContainer [2021-05-22 02:20:54,721 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-22 02:20:54,722 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-22 02:20:54,722 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-22 02:20:54,725 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-22 02:20:54,725 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 22.05 02:20:54" (1/2) ... [2021-05-22 02:20:54,726 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b6fd140 and model type chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.05 02:20:54, skipping insertion in model container [2021-05-22 02:20:54,726 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "chromosome-trans.wvr.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.05 02:20:54" (2/2) ... [2021-05-22 02:20:54,727 INFO L111 eAbstractionObserver]: Analyzing ICFG chromosome-trans.wvr.bpl [2021-05-22 02:20:54,732 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-05-22 02:20:54,732 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-22 02:20:54,732 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-05-22 02:20:54,733 INFO L478 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-05-22 02:20:54,759 INFO L149 ThreadInstanceAdder]: Constructed 3 joinOtherThreadTransitions. [2021-05-22 02:20:54,781 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-22 02:20:54,799 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-05-22 02:20:54,799 INFO L379 AbstractCegarLoop]: Hoare is false [2021-05-22 02:20:54,799 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-22 02:20:54,799 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-22 02:20:54,799 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-22 02:20:54,800 INFO L383 AbstractCegarLoop]: Difference is false [2021-05-22 02:20:54,800 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-22 02:20:54,800 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-22 02:20:54,808 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 32 places, 25 transitions, 74 flow [2021-05-22 02:20:54,824 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 110 states, 108 states have (on average 2.8703703703703702) internal successors, (310), 109 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:54,826 INFO L276 IsEmpty]: Start isEmpty. Operand has 110 states, 108 states have (on average 2.8703703703703702) internal successors, (310), 109 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:54,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 02:20:54,834 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:54,835 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:54,835 INFO L430 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:54,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:54,840 INFO L82 PathProgramCache]: Analyzing trace with hash 480470199, now seen corresponding path program 1 times [2021-05-22 02:20:54,847 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:54,848 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950436043] [2021-05-22 02:20:54,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:54,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,017 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:55,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950436043] [2021-05-22 02:20:55,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950436043] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:55,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [758948329] [2021-05-22 02:20:55,022 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:55,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:55,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,036 INFO L87 Difference]: Start difference. First operand has 110 states, 108 states have (on average 2.8703703703703702) internal successors, (310), 109 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,090 INFO L93 Difference]: Finished difference Result 194 states and 539 transitions. [2021-05-22 02:20:55,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:20:55,091 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-05-22 02:20:55,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,106 INFO L225 Difference]: With dead ends: 194 [2021-05-22 02:20:55,106 INFO L226 Difference]: Without dead ends: 178 [2021-05-22 02:20:55,109 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.5ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-22 02:20:55,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 114. [2021-05-22 02:20:55,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 113 states have (on average 2.8761061946902653) internal successors, (325), 113 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 325 transitions. [2021-05-22 02:20:55,150 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 325 transitions. Word has length 17 [2021-05-22 02:20:55,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,150 INFO L482 AbstractCegarLoop]: Abstraction has 114 states and 325 transitions. [2021-05-22 02:20:55,151 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,151 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 325 transitions. [2021-05-22 02:20:55,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 02:20:55,152 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,152 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,153 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-22 02:20:55,153 INFO L430 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1062696049, now seen corresponding path program 2 times [2021-05-22 02:20:55,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547860923] [2021-05-22 02:20:55,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,196 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:55,197 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547860923] [2021-05-22 02:20:55,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547860923] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:55,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171391958] [2021-05-22 02:20:55,199 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:55,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:55,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,201 INFO L87 Difference]: Start difference. First operand 114 states and 325 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,219 INFO L93 Difference]: Finished difference Result 193 states and 552 transitions. [2021-05-22 02:20:55,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:20:55,220 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-05-22 02:20:55,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,222 INFO L225 Difference]: With dead ends: 193 [2021-05-22 02:20:55,222 INFO L226 Difference]: Without dead ends: 193 [2021-05-22 02:20:55,223 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.2ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2021-05-22 02:20:55,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 129. [2021-05-22 02:20:55,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 2.890625) internal successors, (370), 128 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 370 transitions. [2021-05-22 02:20:55,237 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 370 transitions. Word has length 17 [2021-05-22 02:20:55,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,237 INFO L482 AbstractCegarLoop]: Abstraction has 129 states and 370 transitions. [2021-05-22 02:20:55,237 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,237 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 370 transitions. [2021-05-22 02:20:55,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-22 02:20:55,239 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,239 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,239 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-22 02:20:55,239 INFO L430 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1198421705, now seen corresponding path program 3 times [2021-05-22 02:20:55,240 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254441636] [2021-05-22 02:20:55,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,308 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:55,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254441636] [2021-05-22 02:20:55,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254441636] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:55,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417773021] [2021-05-22 02:20:55,311 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:55,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:55,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,316 INFO L87 Difference]: Start difference. First operand 129 states and 370 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,360 INFO L93 Difference]: Finished difference Result 238 states and 687 transitions. [2021-05-22 02:20:55,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-22 02:20:55,361 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-05-22 02:20:55,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,363 INFO L225 Difference]: With dead ends: 238 [2021-05-22 02:20:55,363 INFO L226 Difference]: Without dead ends: 238 [2021-05-22 02:20:55,364 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 21.0ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:55,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 238 states. [2021-05-22 02:20:55,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 238 to 149. [2021-05-22 02:20:55,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 2.939189189189189) internal successors, (435), 148 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 435 transitions. [2021-05-22 02:20:55,379 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 435 transitions. Word has length 17 [2021-05-22 02:20:55,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,379 INFO L482 AbstractCegarLoop]: Abstraction has 149 states and 435 transitions. [2021-05-22 02:20:55,379 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,380 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 435 transitions. [2021-05-22 02:20:55,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-22 02:20:55,381 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,381 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,381 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-22 02:20:55,381 INFO L430 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,382 INFO L82 PathProgramCache]: Analyzing trace with hash -2134989050, now seen corresponding path program 1 times [2021-05-22 02:20:55,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301101136] [2021-05-22 02:20:55,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:55,423 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,423 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301101136] [2021-05-22 02:20:55,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301101136] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-22 02:20:55,424 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104713500] [2021-05-22 02:20:55,424 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-22 02:20:55,424 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,425 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-22 02:20:55,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,425 INFO L87 Difference]: Start difference. First operand 149 states and 435 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,442 INFO L93 Difference]: Finished difference Result 237 states and 697 transitions. [2021-05-22 02:20:55,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-22 02:20:55,443 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-05-22 02:20:55,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,446 INFO L225 Difference]: With dead ends: 237 [2021-05-22 02:20:55,446 INFO L226 Difference]: Without dead ends: 178 [2021-05-22 02:20:55,447 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 8.6ms TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-05-22 02:20:55,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-22 02:20:55,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2021-05-22 02:20:55,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 177 states have (on average 2.9491525423728815) internal successors, (522), 177 states have internal predecessors, (522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 522 transitions. [2021-05-22 02:20:55,464 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 522 transitions. Word has length 18 [2021-05-22 02:20:55,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,465 INFO L482 AbstractCegarLoop]: Abstraction has 178 states and 522 transitions. [2021-05-22 02:20:55,465 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,465 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 522 transitions. [2021-05-22 02:20:55,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:55,468 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,469 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,469 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-22 02:20:55,469 INFO L430 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,470 INFO L82 PathProgramCache]: Analyzing trace with hash 479941677, now seen corresponding path program 1 times [2021-05-22 02:20:55,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394720347] [2021-05-22 02:20:55,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,524 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:55,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394720347] [2021-05-22 02:20:55,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394720347] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:55,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1078125559] [2021-05-22 02:20:55,525 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:55,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:55,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:55,527 INFO L87 Difference]: Start difference. First operand 178 states and 522 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,571 INFO L93 Difference]: Finished difference Result 199 states and 585 transitions. [2021-05-22 02:20:55,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:55,580 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:55,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,583 INFO L225 Difference]: With dead ends: 199 [2021-05-22 02:20:55,583 INFO L226 Difference]: Without dead ends: 199 [2021-05-22 02:20:55,583 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 17.9ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:55,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2021-05-22 02:20:55,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 199. [2021-05-22 02:20:55,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 198 states have (on average 2.9545454545454546) internal successors, (585), 198 states have internal predecessors, (585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,616 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 585 transitions. [2021-05-22 02:20:55,617 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 585 transitions. Word has length 19 [2021-05-22 02:20:55,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,617 INFO L482 AbstractCegarLoop]: Abstraction has 199 states and 585 transitions. [2021-05-22 02:20:55,617 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,617 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 585 transitions. [2021-05-22 02:20:55,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:55,620 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,620 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,620 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-22 02:20:55,620 INFO L430 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,621 INFO L82 PathProgramCache]: Analyzing trace with hash -727237863, now seen corresponding path program 2 times [2021-05-22 02:20:55,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906896985] [2021-05-22 02:20:55,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,698 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:55,699 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,699 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906896985] [2021-05-22 02:20:55,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906896985] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:55,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757490695] [2021-05-22 02:20:55,700 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:55,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:55,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:55,701 INFO L87 Difference]: Start difference. First operand 199 states and 585 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,757 INFO L93 Difference]: Finished difference Result 303 states and 870 transitions. [2021-05-22 02:20:55,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:55,758 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:55,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,760 INFO L225 Difference]: With dead ends: 303 [2021-05-22 02:20:55,761 INFO L226 Difference]: Without dead ends: 303 [2021-05-22 02:20:55,761 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 41.9ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:55,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2021-05-22 02:20:55,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 206. [2021-05-22 02:20:55,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 2.9902439024390244) internal successors, (613), 205 states have internal predecessors, (613), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 613 transitions. [2021-05-22 02:20:55,772 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 613 transitions. Word has length 19 [2021-05-22 02:20:55,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,774 INFO L482 AbstractCegarLoop]: Abstraction has 206 states and 613 transitions. [2021-05-22 02:20:55,775 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,775 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 613 transitions. [2021-05-22 02:20:55,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:55,781 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,781 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,781 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-22 02:20:55,781 INFO L430 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,782 INFO L82 PathProgramCache]: Analyzing trace with hash -2087010031, now seen corresponding path program 3 times [2021-05-22 02:20:55,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172319636] [2021-05-22 02:20:55,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,836 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:55,836 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,836 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172319636] [2021-05-22 02:20:55,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172319636] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:55,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251295466] [2021-05-22 02:20:55,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:55,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:55,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:55,839 INFO L87 Difference]: Start difference. First operand 206 states and 613 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:55,881 INFO L93 Difference]: Finished difference Result 219 states and 632 transitions. [2021-05-22 02:20:55,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:55,882 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:55,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:55,884 INFO L225 Difference]: With dead ends: 219 [2021-05-22 02:20:55,884 INFO L226 Difference]: Without dead ends: 206 [2021-05-22 02:20:55,885 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.3ms TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:55,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-05-22 02:20:55,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2021-05-22 02:20:55,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 205 states have (on average 2.9560975609756097) internal successors, (606), 205 states have internal predecessors, (606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 606 transitions. [2021-05-22 02:20:55,892 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 606 transitions. Word has length 19 [2021-05-22 02:20:55,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:55,893 INFO L482 AbstractCegarLoop]: Abstraction has 206 states and 606 transitions. [2021-05-22 02:20:55,893 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:55,893 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 606 transitions. [2021-05-22 02:20:55,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:55,894 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:55,894 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:55,894 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-22 02:20:55,894 INFO L430 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:55,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:55,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1343541745, now seen corresponding path program 4 times [2021-05-22 02:20:55,895 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:55,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558849465] [2021-05-22 02:20:55,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:55,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:55,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:55,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:55,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558849465] [2021-05-22 02:20:55,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558849465] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:55,969 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:55,969 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:55,969 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261728812] [2021-05-22 02:20:55,970 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:55,970 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:55,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:55,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:55,971 INFO L87 Difference]: Start difference. First operand 206 states and 606 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:56,012 INFO L93 Difference]: Finished difference Result 301 states and 859 transitions. [2021-05-22 02:20:56,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:56,012 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:56,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:56,014 INFO L225 Difference]: With dead ends: 301 [2021-05-22 02:20:56,014 INFO L226 Difference]: Without dead ends: 301 [2021-05-22 02:20:56,015 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 29.7ms TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:56,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-05-22 02:20:56,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 214. [2021-05-22 02:20:56,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 214 states, 213 states have (on average 2.995305164319249) internal successors, (638), 213 states have internal predecessors, (638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 638 transitions. [2021-05-22 02:20:56,025 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 638 transitions. Word has length 19 [2021-05-22 02:20:56,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:56,025 INFO L482 AbstractCegarLoop]: Abstraction has 214 states and 638 transitions. [2021-05-22 02:20:56,025 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,025 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 638 transitions. [2021-05-22 02:20:56,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:56,026 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:56,026 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:56,026 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-22 02:20:56,026 INFO L430 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:56,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:56,027 INFO L82 PathProgramCache]: Analyzing trace with hash -16230423, now seen corresponding path program 5 times [2021-05-22 02:20:56,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:56,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1243177411] [2021-05-22 02:20:56,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:56,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,074 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:56,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:56,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1243177411] [2021-05-22 02:20:56,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1243177411] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:56,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:56,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:56,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202278864] [2021-05-22 02:20:56,075 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:56,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:56,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:56,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:56,076 INFO L87 Difference]: Start difference. First operand 214 states and 638 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:56,116 INFO L93 Difference]: Finished difference Result 314 states and 878 transitions. [2021-05-22 02:20:56,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:56,116 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:56,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:56,118 INFO L225 Difference]: With dead ends: 314 [2021-05-22 02:20:56,118 INFO L226 Difference]: Without dead ends: 301 [2021-05-22 02:20:56,119 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 33.0ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:56,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-05-22 02:20:56,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 207. [2021-05-22 02:20:56,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 207 states, 206 states have (on average 2.9611650485436893) internal successors, (610), 206 states have internal predecessors, (610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 207 states to 207 states and 610 transitions. [2021-05-22 02:20:56,126 INFO L78 Accepts]: Start accepts. Automaton has 207 states and 610 transitions. Word has length 19 [2021-05-22 02:20:56,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:56,126 INFO L482 AbstractCegarLoop]: Abstraction has 207 states and 610 transitions. [2021-05-22 02:20:56,126 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,126 INFO L276 IsEmpty]: Start isEmpty. Operand 207 states and 610 transitions. [2021-05-22 02:20:56,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:56,127 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:56,127 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:56,127 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-22 02:20:56,127 INFO L430 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:56,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:56,128 INFO L82 PathProgramCache]: Analyzing trace with hash 1056854957, now seen corresponding path program 6 times [2021-05-22 02:20:56,128 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:56,128 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141303661] [2021-05-22 02:20:56,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:56,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,153 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:56,153 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:56,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141303661] [2021-05-22 02:20:56,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141303661] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:56,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:56,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:56,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66749258] [2021-05-22 02:20:56,154 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:56,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:56,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:56,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:56,155 INFO L87 Difference]: Start difference. First operand 207 states and 610 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:56,176 INFO L93 Difference]: Finished difference Result 231 states and 656 transitions. [2021-05-22 02:20:56,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:56,176 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:56,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:56,177 INFO L225 Difference]: With dead ends: 231 [2021-05-22 02:20:56,178 INFO L226 Difference]: Without dead ends: 195 [2021-05-22 02:20:56,178 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 15.1ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:56,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-05-22 02:20:56,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-05-22 02:20:56,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 2.922680412371134) internal successors, (567), 194 states have internal predecessors, (567), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 567 transitions. [2021-05-22 02:20:56,184 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 567 transitions. Word has length 19 [2021-05-22 02:20:56,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:56,184 INFO L482 AbstractCegarLoop]: Abstraction has 195 states and 567 transitions. [2021-05-22 02:20:56,184 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,184 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 567 transitions. [2021-05-22 02:20:56,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:56,185 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:56,185 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:56,185 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-22 02:20:56,185 INFO L430 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:56,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:56,185 INFO L82 PathProgramCache]: Analyzing trace with hash 3917895, now seen corresponding path program 1 times [2021-05-22 02:20:56,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:56,186 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1933947443] [2021-05-22 02:20:56,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:56,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,214 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:56,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:56,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1933947443] [2021-05-22 02:20:56,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1933947443] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:56,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:56,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:56,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581659700] [2021-05-22 02:20:56,216 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:56,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:56,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:56,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:56,216 INFO L87 Difference]: Start difference. First operand 195 states and 567 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,244 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:56,244 INFO L93 Difference]: Finished difference Result 213 states and 621 transitions. [2021-05-22 02:20:56,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-22 02:20:56,245 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:56,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:56,246 INFO L225 Difference]: With dead ends: 213 [2021-05-22 02:20:56,246 INFO L226 Difference]: Without dead ends: 213 [2021-05-22 02:20:56,246 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 19.7ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-22 02:20:56,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-22 02:20:56,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 189. [2021-05-22 02:20:56,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 2.9202127659574466) internal successors, (549), 188 states have internal predecessors, (549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 549 transitions. [2021-05-22 02:20:56,252 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 549 transitions. Word has length 19 [2021-05-22 02:20:56,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:56,252 INFO L482 AbstractCegarLoop]: Abstraction has 189 states and 549 transitions. [2021-05-22 02:20:56,252 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,252 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 549 transitions. [2021-05-22 02:20:56,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-22 02:20:56,253 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:56,253 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:56,253 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-22 02:20:56,253 INFO L430 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:56,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:56,253 INFO L82 PathProgramCache]: Analyzing trace with hash 591663217, now seen corresponding path program 2 times [2021-05-22 02:20:56,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:56,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012779701] [2021-05-22 02:20:56,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:56,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-22 02:20:56,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:56,286 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012779701] [2021-05-22 02:20:56,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012779701] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-22 02:20:56,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-22 02:20:56,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-22 02:20:56,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161085237] [2021-05-22 02:20:56,287 INFO L462 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-22 02:20:56,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:56,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-22 02:20:56,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-22 02:20:56,288 INFO L87 Difference]: Start difference. First operand 189 states and 549 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:56,325 INFO L93 Difference]: Finished difference Result 231 states and 675 transitions. [2021-05-22 02:20:56,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-22 02:20:56,326 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-05-22 02:20:56,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:56,328 INFO L225 Difference]: With dead ends: 231 [2021-05-22 02:20:56,328 INFO L226 Difference]: Without dead ends: 231 [2021-05-22 02:20:56,328 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 23.8ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-22 02:20:56,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-05-22 02:20:56,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 189. [2021-05-22 02:20:56,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 2.9202127659574466) internal successors, (549), 188 states have internal predecessors, (549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 549 transitions. [2021-05-22 02:20:56,335 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 549 transitions. Word has length 19 [2021-05-22 02:20:56,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:56,335 INFO L482 AbstractCegarLoop]: Abstraction has 189 states and 549 transitions. [2021-05-22 02:20:56,336 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:56,336 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 549 transitions. [2021-05-22 02:20:56,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:20:56,337 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:56,338 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:56,338 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-22 02:20:56,338 INFO L430 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:56,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:56,338 INFO L82 PathProgramCache]: Analyzing trace with hash 1066078798, now seen corresponding path program 1 times [2021-05-22 02:20:56,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:56,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888573914] [2021-05-22 02:20:56,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:56,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,577 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:56,577 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:56,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888573914] [2021-05-22 02:20:56,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888573914] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:56,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272353405] [2021-05-22 02:20:56,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:56,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:56,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:20:56,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:56,890 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:20:56,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:20:56,897 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:56,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:56,908 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:20:56,909 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:32, output treesize:25 [2021-05-22 02:20:57,131 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:20:57,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:20:57,136 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:57,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:57,148 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:20:57,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:20:57,150 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:57,166 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:57,170 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:20:57,170 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:9 [2021-05-22 02:20:57,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:57,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272353405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:57,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:57,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:20:57,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351628617] [2021-05-22 02:20:57,223 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:20:57,223 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:57,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:20:57,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:20:57,224 INFO L87 Difference]: Start difference. First operand 189 states and 549 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:58,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:58,153 INFO L93 Difference]: Finished difference Result 430 states and 1253 transitions. [2021-05-22 02:20:58,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:20:58,154 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:20:58,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:58,156 INFO L225 Difference]: With dead ends: 430 [2021-05-22 02:20:58,156 INFO L226 Difference]: Without dead ends: 415 [2021-05-22 02:20:58,157 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 716.0ms TimeCoverageRelationStatistics Valid=180, Invalid=750, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:20:58,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-05-22 02:20:58,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 211. [2021-05-22 02:20:58,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 210 states have (on average 2.9047619047619047) internal successors, (610), 210 states have internal predecessors, (610), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:58,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 610 transitions. [2021-05-22 02:20:58,165 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 610 transitions. Word has length 20 [2021-05-22 02:20:58,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:58,165 INFO L482 AbstractCegarLoop]: Abstraction has 211 states and 610 transitions. [2021-05-22 02:20:58,165 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:58,165 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 610 transitions. [2021-05-22 02:20:58,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:20:58,166 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:58,166 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:58,387 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-05-22 02:20:58,387 INFO L430 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:58,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:58,388 INFO L82 PathProgramCache]: Analyzing trace with hash -876621394, now seen corresponding path program 2 times [2021-05-22 02:20:58,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:58,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074441487] [2021-05-22 02:20:58,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:58,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:58,550 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:58,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:58,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074441487] [2021-05-22 02:20:58,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2074441487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:58,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1251590443] [2021-05-22 02:20:58,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:58,600 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:20:58,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:20:58,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:20:58,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:58,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:20:58,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:20:58,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:58,716 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:58,719 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:20:58,719 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:20:58,843 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:20:58,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:20:58,848 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:58,855 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:58,858 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:20:58,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:20:58,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:20:58,865 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:20:58,867 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:20:58,867 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:9 [2021-05-22 02:20:58,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:58,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1251590443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:58,910 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:20:58,910 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:20:58,910 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49974352] [2021-05-22 02:20:58,911 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:20:58,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:20:58,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:20:58,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:20:58,912 INFO L87 Difference]: Start difference. First operand 211 states and 610 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:59,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:20:59,496 INFO L93 Difference]: Finished difference Result 350 states and 1015 transitions. [2021-05-22 02:20:59,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:20:59,497 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:20:59,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:20:59,499 INFO L225 Difference]: With dead ends: 350 [2021-05-22 02:20:59,499 INFO L226 Difference]: Without dead ends: 335 [2021-05-22 02:20:59,499 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 439.4ms TimeCoverageRelationStatistics Valid=120, Invalid=530, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:20:59,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-05-22 02:20:59,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 217. [2021-05-22 02:20:59,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 2.912037037037037) internal successors, (629), 216 states have internal predecessors, (629), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:59,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 629 transitions. [2021-05-22 02:20:59,505 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 629 transitions. Word has length 20 [2021-05-22 02:20:59,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:20:59,506 INFO L482 AbstractCegarLoop]: Abstraction has 217 states and 629 transitions. [2021-05-22 02:20:59,506 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:20:59,506 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 629 transitions. [2021-05-22 02:20:59,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:20:59,507 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:20:59,507 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:20:59,729 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-05-22 02:20:59,730 INFO L430 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:20:59,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:20:59,730 INFO L82 PathProgramCache]: Analyzing trace with hash -1378412730, now seen corresponding path program 3 times [2021-05-22 02:20:59,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:20:59,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194417468] [2021-05-22 02:20:59,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:20:59,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:20:59,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:20:59,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:20:59,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194417468] [2021-05-22 02:20:59,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [194417468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:20:59,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [55502633] [2021-05-22 02:20:59,876 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:20:59,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:20:59,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:20:59,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:20:59,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:20:59,992 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:20:59,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:20:59,994 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:00,001 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:00,004 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:00,004 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:21:00,063 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:21:00,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:00,067 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:00,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:00,077 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:00,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:00,078 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:00,084 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:00,086 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:00,086 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:21:00,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:00,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [55502633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:00,142 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:00,142 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:00,142 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309958150] [2021-05-22 02:21:00,142 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:00,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:00,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:00,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:00,143 INFO L87 Difference]: Start difference. First operand 217 states and 629 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:00,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:00,669 INFO L93 Difference]: Finished difference Result 356 states and 1028 transitions. [2021-05-22 02:21:00,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:21:00,669 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:00,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:00,671 INFO L225 Difference]: With dead ends: 356 [2021-05-22 02:21:00,671 INFO L226 Difference]: Without dead ends: 341 [2021-05-22 02:21:00,672 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 412.8ms TimeCoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:21:00,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2021-05-22 02:21:00,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 215. [2021-05-22 02:21:00,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 2.9065420560747666) internal successors, (622), 214 states have internal predecessors, (622), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:00,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 622 transitions. [2021-05-22 02:21:00,678 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 622 transitions. Word has length 20 [2021-05-22 02:21:00,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:00,678 INFO L482 AbstractCegarLoop]: Abstraction has 215 states and 622 transitions. [2021-05-22 02:21:00,678 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:00,678 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 622 transitions. [2021-05-22 02:21:00,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:00,679 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:00,679 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:00,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-05-22 02:21:00,893 INFO L430 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:00,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:00,893 INFO L82 PathProgramCache]: Analyzing trace with hash 809770446, now seen corresponding path program 4 times [2021-05-22 02:21:00,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:00,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307458391] [2021-05-22 02:21:00,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:00,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:01,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:01,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:01,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307458391] [2021-05-22 02:21:01,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307458391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:01,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957566439] [2021-05-22 02:21:01,024 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:01,057 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:01,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:01,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:01,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:01,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:01,131 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:01,136 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:01,137 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:01,137 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:23 [2021-05-22 02:21:01,164 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:01,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:01,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:01,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:01,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:01,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:01,177 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:01,183 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:01,185 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:01,185 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:21:01,241 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:01,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957566439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:01,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:01,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:01,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220060742] [2021-05-22 02:21:01,242 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:01,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:01,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:01,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:01,243 INFO L87 Difference]: Start difference. First operand 215 states and 622 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:01,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:01,673 INFO L93 Difference]: Finished difference Result 339 states and 983 transitions. [2021-05-22 02:21:01,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:01,673 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:01,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:01,675 INFO L225 Difference]: With dead ends: 339 [2021-05-22 02:21:01,675 INFO L226 Difference]: Without dead ends: 324 [2021-05-22 02:21:01,675 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 365.4ms TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:21:01,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-05-22 02:21:01,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 227. [2021-05-22 02:21:01,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 2.911504424778761) internal successors, (658), 226 states have internal predecessors, (658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:01,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 658 transitions. [2021-05-22 02:21:01,682 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 658 transitions. Word has length 20 [2021-05-22 02:21:01,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:01,682 INFO L482 AbstractCegarLoop]: Abstraction has 227 states and 658 transitions. [2021-05-22 02:21:01,682 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:01,682 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 658 transitions. [2021-05-22 02:21:01,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:01,683 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:01,683 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:01,905 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:01,905 INFO L430 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:01,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:01,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1389597972, now seen corresponding path program 5 times [2021-05-22 02:21:01,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:01,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789585667] [2021-05-22 02:21:01,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:01,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:02,042 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:02,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:02,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789585667] [2021-05-22 02:21:02,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789585667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:02,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414864513] [2021-05-22 02:21:02,043 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:02,079 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:02,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:02,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:02,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:02,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:02,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:02,118 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:02,124 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:02,126 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:02,126 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:21:02,270 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:21:02,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:02,274 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:02,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:02,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:02,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:02,286 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:02,291 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:02,293 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:02,293 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:9 [2021-05-22 02:21:02,325 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:02,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414864513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:02,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:02,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:02,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802390688] [2021-05-22 02:21:02,326 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:02,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:02,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:02,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:02,327 INFO L87 Difference]: Start difference. First operand 227 states and 658 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:03,115 INFO L93 Difference]: Finished difference Result 487 states and 1405 transitions. [2021-05-22 02:21:03,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:21:03,116 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:03,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:03,118 INFO L225 Difference]: With dead ends: 487 [2021-05-22 02:21:03,119 INFO L226 Difference]: Without dead ends: 472 [2021-05-22 02:21:03,119 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 197 ImplicationChecksByTransitivity, 577.8ms TimeCoverageRelationStatistics Valid=187, Invalid=743, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:21:03,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-22 02:21:03,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 241. [2021-05-22 02:21:03,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.995833333333333) internal successors, (719), 240 states have internal predecessors, (719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 719 transitions. [2021-05-22 02:21:03,126 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 719 transitions. Word has length 20 [2021-05-22 02:21:03,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:03,127 INFO L482 AbstractCegarLoop]: Abstraction has 241 states and 719 transitions. [2021-05-22 02:21:03,127 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,127 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 719 transitions. [2021-05-22 02:21:03,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:03,128 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:03,128 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:03,328 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-05-22 02:21:03,328 INFO L430 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:03,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:03,329 INFO L82 PathProgramCache]: Analyzing trace with hash 780645038, now seen corresponding path program 6 times [2021-05-22 02:21:03,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:03,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2145445897] [2021-05-22 02:21:03,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:03,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:03,467 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:03,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:03,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2145445897] [2021-05-22 02:21:03,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2145445897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:03,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634655026] [2021-05-22 02:21:03,468 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:03,502 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:03,502 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:03,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:03,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:03,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:03,558 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:03,565 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:03,566 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:03,566 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:03,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:03,632 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:03,635 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:03,635 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:03,636 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:03,636 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:03,648 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:03,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634655026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:03,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:03,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:03,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043174245] [2021-05-22 02:21:03,649 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:03,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:03,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:03,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:03,650 INFO L87 Difference]: Start difference. First operand 241 states and 719 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:03,838 INFO L93 Difference]: Finished difference Result 333 states and 976 transitions. [2021-05-22 02:21:03,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:03,839 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:03,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:03,841 INFO L225 Difference]: With dead ends: 333 [2021-05-22 02:21:03,841 INFO L226 Difference]: Without dead ends: 318 [2021-05-22 02:21:03,841 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 156.7ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:03,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 318 states. [2021-05-22 02:21:03,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 318 to 247. [2021-05-22 02:21:03,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 247 states, 246 states have (on average 3.016260162601626) internal successors, (742), 246 states have internal predecessors, (742), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 247 states to 247 states and 742 transitions. [2021-05-22 02:21:03,848 INFO L78 Accepts]: Start accepts. Automaton has 247 states and 742 transitions. Word has length 20 [2021-05-22 02:21:03,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:03,848 INFO L482 AbstractCegarLoop]: Abstraction has 247 states and 742 transitions. [2021-05-22 02:21:03,848 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:03,848 INFO L276 IsEmpty]: Start isEmpty. Operand 247 states and 742 transitions. [2021-05-22 02:21:03,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:03,849 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:03,849 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:04,073 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:04,073 INFO L430 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:04,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:04,073 INFO L82 PathProgramCache]: Analyzing trace with hash 278853702, now seen corresponding path program 7 times [2021-05-22 02:21:04,073 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:04,074 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1941381017] [2021-05-22 02:21:04,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:04,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:04,212 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:04,212 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:04,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1941381017] [2021-05-22 02:21:04,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1941381017] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:04,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1074873558] [2021-05-22 02:21:04,212 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:04,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:04,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:04,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:04,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:04,299 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:04,305 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:04,305 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:04,305 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:04,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:04,354 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:04,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:04,359 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:04,359 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:04,359 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:04,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:04,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1074873558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:04,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:04,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:04,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991252372] [2021-05-22 02:21:04,390 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:04,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:04,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:04,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:04,391 INFO L87 Difference]: Start difference. First operand 247 states and 742 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:04,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:04,577 INFO L93 Difference]: Finished difference Result 327 states and 963 transitions. [2021-05-22 02:21:04,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:04,577 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:04,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:04,579 INFO L225 Difference]: With dead ends: 327 [2021-05-22 02:21:04,579 INFO L226 Difference]: Without dead ends: 312 [2021-05-22 02:21:04,579 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 152.9ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:04,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-22 02:21:04,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 245. [2021-05-22 02:21:04,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 244 states have (on average 3.012295081967213) internal successors, (735), 244 states have internal predecessors, (735), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:04,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 735 transitions. [2021-05-22 02:21:04,586 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 735 transitions. Word has length 20 [2021-05-22 02:21:04,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:04,586 INFO L482 AbstractCegarLoop]: Abstraction has 245 states and 735 transitions. [2021-05-22 02:21:04,586 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:04,586 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 735 transitions. [2021-05-22 02:21:04,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:04,587 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:04,588 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:04,811 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:04,811 INFO L430 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:04,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:04,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1252991442, now seen corresponding path program 8 times [2021-05-22 02:21:04,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:04,812 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69443815] [2021-05-22 02:21:04,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:04,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:04,990 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:04,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:04,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69443815] [2021-05-22 02:21:04,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69443815] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:04,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1656937917] [2021-05-22 02:21:04,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:05,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:05,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:05,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:05,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:05,095 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:05,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:05,096 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:05,108 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:05,114 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:05,114 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:21:05,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:05,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:05,251 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:05,260 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:05,263 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:05,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:05,264 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:05,273 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:05,275 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:05,275 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:15 [2021-05-22 02:21:05,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:05,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1656937917] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:05,339 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:05,339 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:05,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045211322] [2021-05-22 02:21:05,339 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:05,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:05,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:05,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:05,340 INFO L87 Difference]: Start difference. First operand 245 states and 735 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:05,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:05,916 INFO L93 Difference]: Finished difference Result 388 states and 1142 transitions. [2021-05-22 02:21:05,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:21:05,917 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:05,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:05,918 INFO L225 Difference]: With dead ends: 388 [2021-05-22 02:21:05,918 INFO L226 Difference]: Without dead ends: 373 [2021-05-22 02:21:05,919 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 450.1ms TimeCoverageRelationStatistics Valid=105, Invalid=495, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:21:05,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 373 states. [2021-05-22 02:21:05,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 373 to 242. [2021-05-22 02:21:05,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 242 states, 241 states have (on average 3.004149377593361) internal successors, (724), 241 states have internal predecessors, (724), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:05,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 724 transitions. [2021-05-22 02:21:05,925 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 724 transitions. Word has length 20 [2021-05-22 02:21:05,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:05,925 INFO L482 AbstractCegarLoop]: Abstraction has 242 states and 724 transitions. [2021-05-22 02:21:05,925 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:05,925 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 724 transitions. [2021-05-22 02:21:05,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:05,926 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:05,926 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:06,150 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-05-22 02:21:06,150 INFO L430 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:06,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:06,151 INFO L82 PathProgramCache]: Analyzing trace with hash 251310436, now seen corresponding path program 9 times [2021-05-22 02:21:06,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:06,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933454078] [2021-05-22 02:21:06,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:06,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:06,294 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:06,294 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:06,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933454078] [2021-05-22 02:21:06,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933454078] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:06,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1123051011] [2021-05-22 02:21:06,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:06,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:21:06,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:06,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:06,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:06,400 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:06,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:06,402 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:06,412 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:06,416 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:06,416 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:43, output treesize:36 [2021-05-22 02:21:06,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:06,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:06,455 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:06,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:06,469 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:06,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:06,470 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:06,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:06,482 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:06,482 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:15 [2021-05-22 02:21:06,564 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:06,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1123051011] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:06,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:06,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:06,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970938879] [2021-05-22 02:21:06,564 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:06,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:06,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:06,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:06,565 INFO L87 Difference]: Start difference. First operand 242 states and 724 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:06,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:06,918 INFO L93 Difference]: Finished difference Result 392 states and 1154 transitions. [2021-05-22 02:21:06,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:06,919 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:06,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:06,920 INFO L225 Difference]: With dead ends: 392 [2021-05-22 02:21:06,920 INFO L226 Difference]: Without dead ends: 377 [2021-05-22 02:21:06,921 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 297.5ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:06,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-05-22 02:21:06,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 241. [2021-05-22 02:21:06,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.995833333333333) internal successors, (719), 240 states have internal predecessors, (719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:06,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 719 transitions. [2021-05-22 02:21:06,927 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 719 transitions. Word has length 20 [2021-05-22 02:21:06,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:06,927 INFO L482 AbstractCegarLoop]: Abstraction has 241 states and 719 transitions. [2021-05-22 02:21:06,928 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:06,928 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 719 transitions. [2021-05-22 02:21:06,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:06,928 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:06,928 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:07,144 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-05-22 02:21:07,145 INFO L430 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:07,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:07,145 INFO L82 PathProgramCache]: Analyzing trace with hash -1438632468, now seen corresponding path program 10 times [2021-05-22 02:21:07,145 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:07,145 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2060259715] [2021-05-22 02:21:07,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:07,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:07,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:07,265 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:07,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2060259715] [2021-05-22 02:21:07,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2060259715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:07,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995486733] [2021-05-22 02:21:07,266 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:07,294 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:07,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:07,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:07,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:07,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:07,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:07,364 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:07,364 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:07,365 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:07,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:07,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:07,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:07,397 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:21:07,401 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:07,401 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:21:07,429 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:07,429 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995486733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:07,429 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:07,429 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:21:07,431 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090438125] [2021-05-22 02:21:07,431 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:21:07,431 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:07,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:21:07,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:07,432 INFO L87 Difference]: Start difference. First operand 241 states and 719 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:07,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:07,622 INFO L93 Difference]: Finished difference Result 313 states and 920 transitions. [2021-05-22 02:21:07,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:07,623 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:07,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:07,624 INFO L225 Difference]: With dead ends: 313 [2021-05-22 02:21:07,624 INFO L226 Difference]: Without dead ends: 298 [2021-05-22 02:21:07,625 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 136.1ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:07,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-05-22 02:21:07,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 241. [2021-05-22 02:21:07,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 2.995833333333333) internal successors, (719), 240 states have internal predecessors, (719), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:07,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 719 transitions. [2021-05-22 02:21:07,631 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 719 transitions. Word has length 20 [2021-05-22 02:21:07,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:07,631 INFO L482 AbstractCegarLoop]: Abstraction has 241 states and 719 transitions. [2021-05-22 02:21:07,631 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:07,631 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 719 transitions. [2021-05-22 02:21:07,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:07,632 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:07,632 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:07,832 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-05-22 02:21:07,833 INFO L430 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:07,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:07,833 INFO L82 PathProgramCache]: Analyzing trace with hash -314612260, now seen corresponding path program 11 times [2021-05-22 02:21:07,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:07,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115398192] [2021-05-22 02:21:07,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:07,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:07,966 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:07,966 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:07,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115398192] [2021-05-22 02:21:07,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115398192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:07,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491854204] [2021-05-22 02:21:07,966 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:07,999 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:07,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:08,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:08,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:08,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:08,029 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:08,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:08,033 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:08,051 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:08,052 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:08,053 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:61, output treesize:47 [2021-05-22 02:21:08,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:08,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:08,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:21:08,195 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:08,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:08,206 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:08,207 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:08,207 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:27 [2021-05-22 02:21:08,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:08,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491854204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:08,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:08,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:08,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258748486] [2021-05-22 02:21:08,274 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:08,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:08,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:08,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:08,275 INFO L87 Difference]: Start difference. First operand 241 states and 719 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,139 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:09,139 INFO L93 Difference]: Finished difference Result 525 states and 1564 transitions. [2021-05-22 02:21:09,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-22 02:21:09,140 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:09,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:09,143 INFO L225 Difference]: With dead ends: 525 [2021-05-22 02:21:09,143 INFO L226 Difference]: Without dead ends: 495 [2021-05-22 02:21:09,144 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 200 ImplicationChecksByTransitivity, 804.1ms TimeCoverageRelationStatistics Valid=204, Invalid=788, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:21:09,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2021-05-22 02:21:09,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 245. [2021-05-22 02:21:09,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 244 states have (on average 2.9959016393442623) internal successors, (731), 244 states have internal predecessors, (731), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 731 transitions. [2021-05-22 02:21:09,152 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 731 transitions. Word has length 20 [2021-05-22 02:21:09,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:09,152 INFO L482 AbstractCegarLoop]: Abstraction has 245 states and 731 transitions. [2021-05-22 02:21:09,152 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,152 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 731 transitions. [2021-05-22 02:21:09,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:09,153 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:09,153 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:09,375 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-05-22 02:21:09,375 INFO L430 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:09,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:09,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1996748574, now seen corresponding path program 12 times [2021-05-22 02:21:09,376 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:09,376 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658143477] [2021-05-22 02:21:09,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:09,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:09,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:09,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:09,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658143477] [2021-05-22 02:21:09,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658143477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:09,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [352529892] [2021-05-22 02:21:09,493 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:09,523 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:09,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:09,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:09,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:09,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:09,576 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:09,581 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:09,582 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:09,582 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:09,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:09,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:09,608 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:09,608 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:09,609 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:09,609 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:09,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:09,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [352529892] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:09,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:09,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:09,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470146738] [2021-05-22 02:21:09,623 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:09,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:09,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:09,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:09,624 INFO L87 Difference]: Start difference. First operand 245 states and 731 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:09,775 INFO L93 Difference]: Finished difference Result 326 states and 964 transitions. [2021-05-22 02:21:09,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:09,776 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:09,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:09,777 INFO L225 Difference]: With dead ends: 326 [2021-05-22 02:21:09,777 INFO L226 Difference]: Without dead ends: 311 [2021-05-22 02:21:09,777 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 103.7ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:09,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2021-05-22 02:21:09,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 252. [2021-05-22 02:21:09,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 251 states have (on average 3.00398406374502) internal successors, (754), 251 states have internal predecessors, (754), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 754 transitions. [2021-05-22 02:21:09,783 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 754 transitions. Word has length 20 [2021-05-22 02:21:09,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:09,783 INFO L482 AbstractCegarLoop]: Abstraction has 252 states and 754 transitions. [2021-05-22 02:21:09,783 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:09,783 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 754 transitions. [2021-05-22 02:21:09,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:09,784 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:09,784 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:10,007 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-05-22 02:21:10,007 INFO L430 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:10,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:10,007 INFO L82 PathProgramCache]: Analyzing trace with hash 2032800900, now seen corresponding path program 13 times [2021-05-22 02:21:10,007 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:10,007 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639454655] [2021-05-22 02:21:10,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:10,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:10,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:10,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:10,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639454655] [2021-05-22 02:21:10,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639454655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:10,111 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [868402104] [2021-05-22 02:21:10,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:10,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:10,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:10,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:10,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:10,210 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:10,214 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,215 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:10,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:10,227 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,231 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:10,231 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:10,231 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,231 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:10,247 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:10,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [868402104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:10,248 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:10,248 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:10,248 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2044589639] [2021-05-22 02:21:10,249 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:10,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:10,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:10,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:10,250 INFO L87 Difference]: Start difference. First operand 252 states and 754 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:10,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:10,386 INFO L93 Difference]: Finished difference Result 332 states and 977 transitions. [2021-05-22 02:21:10,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:10,387 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:10,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:10,388 INFO L225 Difference]: With dead ends: 332 [2021-05-22 02:21:10,388 INFO L226 Difference]: Without dead ends: 317 [2021-05-22 02:21:10,388 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 104.9ms TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:10,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-05-22 02:21:10,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 249. [2021-05-22 02:21:10,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 2.995967741935484) internal successors, (743), 248 states have internal predecessors, (743), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:10,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 743 transitions. [2021-05-22 02:21:10,397 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 743 transitions. Word has length 20 [2021-05-22 02:21:10,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:10,397 INFO L482 AbstractCegarLoop]: Abstraction has 249 states and 743 transitions. [2021-05-22 02:21:10,397 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:10,397 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 743 transitions. [2021-05-22 02:21:10,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:10,398 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:10,398 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:10,621 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-05-22 02:21:10,621 INFO L430 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:10,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:10,621 INFO L82 PathProgramCache]: Analyzing trace with hash -115995636, now seen corresponding path program 14 times [2021-05-22 02:21:10,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:10,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171370992] [2021-05-22 02:21:10,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:10,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:10,728 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:10,728 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:10,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171370992] [2021-05-22 02:21:10,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171370992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:10,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985228515] [2021-05-22 02:21:10,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:10,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:10,776 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:10,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:10,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:10,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:10,817 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:10,822 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,822 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:10,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:10,844 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:10,848 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:10,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:10,849 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:21:10,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:10,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [985228515] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:10,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:10,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:21:10,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [360448079] [2021-05-22 02:21:10,866 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:21:10,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:10,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:21:10,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:10,867 INFO L87 Difference]: Start difference. First operand 249 states and 743 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:11,032 INFO L93 Difference]: Finished difference Result 327 states and 966 transitions. [2021-05-22 02:21:11,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:11,033 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:11,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:11,034 INFO L225 Difference]: With dead ends: 327 [2021-05-22 02:21:11,035 INFO L226 Difference]: Without dead ends: 312 [2021-05-22 02:21:11,035 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 121.4ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:11,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-05-22 02:21:11,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 262. [2021-05-22 02:21:11,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 2.992337164750958) internal successors, (781), 261 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 781 transitions. [2021-05-22 02:21:11,047 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 781 transitions. Word has length 20 [2021-05-22 02:21:11,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:11,047 INFO L482 AbstractCegarLoop]: Abstraction has 262 states and 781 transitions. [2021-05-22 02:21:11,048 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,048 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 781 transitions. [2021-05-22 02:21:11,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:11,049 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:11,049 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:11,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:11,269 INFO L430 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:11,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:11,269 INFO L82 PathProgramCache]: Analyzing trace with hash -742091602, now seen corresponding path program 15 times [2021-05-22 02:21:11,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:11,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372064029] [2021-05-22 02:21:11,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:11,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:11,415 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:11,415 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:11,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372064029] [2021-05-22 02:21:11,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372064029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:11,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962603936] [2021-05-22 02:21:11,415 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:11,452 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:21:11,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:11,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:11,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:11,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:11,497 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:11,502 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:11,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:11,503 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:11,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:11,565 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:11,568 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:11,568 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:11,568 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:11,568 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:11,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:11,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962603936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:11,602 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:11,602 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:11,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940666693] [2021-05-22 02:21:11,602 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:11,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:11,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:11,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:11,603 INFO L87 Difference]: Start difference. First operand 262 states and 781 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:11,819 INFO L93 Difference]: Finished difference Result 392 states and 1151 transitions. [2021-05-22 02:21:11,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:11,820 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:11,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:11,822 INFO L225 Difference]: With dead ends: 392 [2021-05-22 02:21:11,822 INFO L226 Difference]: Without dead ends: 377 [2021-05-22 02:21:11,822 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 202.7ms TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:11,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 377 states. [2021-05-22 02:21:11,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 377 to 268. [2021-05-22 02:21:11,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 3.0112359550561796) internal successors, (804), 267 states have internal predecessors, (804), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 804 transitions. [2021-05-22 02:21:11,828 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 804 transitions. Word has length 20 [2021-05-22 02:21:11,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:11,828 INFO L482 AbstractCegarLoop]: Abstraction has 268 states and 804 transitions. [2021-05-22 02:21:11,828 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:11,828 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 804 transitions. [2021-05-22 02:21:11,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:11,829 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:11,829 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:12,044 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:12,045 INFO L430 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:12,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:12,045 INFO L82 PathProgramCache]: Analyzing trace with hash -1243882938, now seen corresponding path program 16 times [2021-05-22 02:21:12,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:12,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598669392] [2021-05-22 02:21:12,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:12,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:12,174 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:12,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:12,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598669392] [2021-05-22 02:21:12,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598669392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:12,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793766657] [2021-05-22 02:21:12,174 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:12,202 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:12,202 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:12,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:12,203 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:12,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:12,246 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:12,251 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,252 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:12,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:12,293 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,297 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:12,297 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:12,297 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,297 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:12,342 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:12,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793766657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:12,342 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:12,342 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:12,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207833614] [2021-05-22 02:21:12,342 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:12,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:12,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:12,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:12,343 INFO L87 Difference]: Start difference. First operand 268 states and 804 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:12,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:12,572 INFO L93 Difference]: Finished difference Result 386 states and 1138 transitions. [2021-05-22 02:21:12,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:12,572 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:12,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:12,574 INFO L225 Difference]: With dead ends: 386 [2021-05-22 02:21:12,574 INFO L226 Difference]: Without dead ends: 371 [2021-05-22 02:21:12,574 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 185.4ms TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:12,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-05-22 02:21:12,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 266. [2021-05-22 02:21:12,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 265 states have (on average 3.0075471698113208) internal successors, (797), 265 states have internal predecessors, (797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:12,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 797 transitions. [2021-05-22 02:21:12,580 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 797 transitions. Word has length 20 [2021-05-22 02:21:12,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:12,580 INFO L482 AbstractCegarLoop]: Abstraction has 266 states and 797 transitions. [2021-05-22 02:21:12,580 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:12,580 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 797 transitions. [2021-05-22 02:21:12,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:12,581 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:12,581 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:12,781 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:12,781 INFO L430 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:12,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:12,782 INFO L82 PathProgramCache]: Analyzing trace with hash 1519239214, now seen corresponding path program 17 times [2021-05-22 02:21:12,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:12,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367448750] [2021-05-22 02:21:12,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:12,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:12,892 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:12,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:12,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367448750] [2021-05-22 02:21:12,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367448750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:12,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [456708525] [2021-05-22 02:21:12,892 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:12,930 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:12,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:12,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:12,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:12,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:12,981 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,986 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:12,986 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:12,987 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:13,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:13,030 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,034 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:13,034 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:13,035 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,035 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:13,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:13,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [456708525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:13,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:13,052 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:13,052 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562862874] [2021-05-22 02:21:13,052 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:13,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:13,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:13,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:13,053 INFO L87 Difference]: Start difference. First operand 266 states and 797 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:13,218 INFO L93 Difference]: Finished difference Result 364 states and 1072 transitions. [2021-05-22 02:21:13,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:13,220 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:13,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:13,222 INFO L225 Difference]: With dead ends: 364 [2021-05-22 02:21:13,222 INFO L226 Difference]: Without dead ends: 349 [2021-05-22 02:21:13,223 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:13,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-05-22 02:21:13,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 263. [2021-05-22 02:21:13,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 3.0) internal successors, (786), 262 states have internal predecessors, (786), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 786 transitions. [2021-05-22 02:21:13,236 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 786 transitions. Word has length 20 [2021-05-22 02:21:13,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:13,236 INFO L482 AbstractCegarLoop]: Abstraction has 263 states and 786 transitions. [2021-05-22 02:21:13,236 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,236 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 786 transitions. [2021-05-22 02:21:13,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:13,237 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:13,237 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:13,452 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable53 [2021-05-22 02:21:13,453 INFO L430 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:13,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:13,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1271426204, now seen corresponding path program 18 times [2021-05-22 02:21:13,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:13,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [635139971] [2021-05-22 02:21:13,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:13,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:13,572 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:13,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:13,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [635139971] [2021-05-22 02:21:13,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [635139971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:13,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857994827] [2021-05-22 02:21:13,572 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:13,600 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:13,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:13,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:13,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:13,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:13,645 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,651 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:13,651 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,652 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:13,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:13,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:13,673 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:13,673 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:13,674 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:21:13,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:13,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857994827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:13,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:13,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:21:13,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284300387] [2021-05-22 02:21:13,697 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:21:13,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:13,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:21:13,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:13,698 INFO L87 Difference]: Start difference. First operand 263 states and 786 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:13,837 INFO L93 Difference]: Finished difference Result 361 states and 1061 transitions. [2021-05-22 02:21:13,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:13,837 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:13,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:13,838 INFO L225 Difference]: With dead ends: 361 [2021-05-22 02:21:13,838 INFO L226 Difference]: Without dead ends: 346 [2021-05-22 02:21:13,839 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 124.5ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:13,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-05-22 02:21:13,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 262. [2021-05-22 02:21:13,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 2.992337164750958) internal successors, (781), 261 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 781 transitions. [2021-05-22 02:21:13,844 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 781 transitions. Word has length 20 [2021-05-22 02:21:13,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:13,844 INFO L482 AbstractCegarLoop]: Abstraction has 262 states and 781 transitions. [2021-05-22 02:21:13,844 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:13,844 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 781 transitions. [2021-05-22 02:21:13,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:13,845 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:13,845 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:14,067 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-05-22 02:21:14,067 INFO L430 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:14,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:14,068 INFO L82 PathProgramCache]: Analyzing trace with hash 418516700, now seen corresponding path program 19 times [2021-05-22 02:21:14,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:14,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449139268] [2021-05-22 02:21:14,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:14,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:14,190 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:14,190 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:14,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449139268] [2021-05-22 02:21:14,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449139268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:14,191 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1932904905] [2021-05-22 02:21:14,191 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:14,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:14,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:14,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:14,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:14,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:14,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:14,267 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:14,267 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:21:14,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:14,287 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:14,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:14,292 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:14,292 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:14,292 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:21:14,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:14,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1932904905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:14,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:14,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:21:14,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757033633] [2021-05-22 02:21:14,315 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:21:14,315 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:14,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:21:14,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:14,316 INFO L87 Difference]: Start difference. First operand 262 states and 781 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:14,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:14,489 INFO L93 Difference]: Finished difference Result 343 states and 1008 transitions. [2021-05-22 02:21:14,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:14,489 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:14,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:14,490 INFO L225 Difference]: With dead ends: 343 [2021-05-22 02:21:14,490 INFO L226 Difference]: Without dead ends: 328 [2021-05-22 02:21:14,491 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 135.9ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:14,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2021-05-22 02:21:14,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 262. [2021-05-22 02:21:14,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 2.992337164750958) internal successors, (781), 261 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:14,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 781 transitions. [2021-05-22 02:21:14,496 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 781 transitions. Word has length 20 [2021-05-22 02:21:14,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:14,496 INFO L482 AbstractCegarLoop]: Abstraction has 262 states and 781 transitions. [2021-05-22 02:21:14,496 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:14,496 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 781 transitions. [2021-05-22 02:21:14,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:14,497 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:14,497 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:14,704 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-05-22 02:21:14,705 INFO L430 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:14,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:14,705 INFO L82 PathProgramCache]: Analyzing trace with hash -730480638, now seen corresponding path program 20 times [2021-05-22 02:21:14,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:14,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818233082] [2021-05-22 02:21:14,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:14,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:14,842 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:14,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:14,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818233082] [2021-05-22 02:21:14,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818233082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:14,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039665813] [2021-05-22 02:21:14,842 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:14,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:14,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:14,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:14,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:14,979 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:14,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:14,980 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:14,987 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:14,988 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:14,988 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:15,017 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:15,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:15,018 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:15,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:15,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:15,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:15,031 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:15,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:15,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:15,040 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:15,086 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:15,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039665813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:15,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:15,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:15,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [721819482] [2021-05-22 02:21:15,087 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:15,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:15,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:15,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:15,087 INFO L87 Difference]: Start difference. First operand 262 states and 781 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:15,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:15,470 INFO L93 Difference]: Finished difference Result 367 states and 1085 transitions. [2021-05-22 02:21:15,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:21:15,470 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:15,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:15,471 INFO L225 Difference]: With dead ends: 367 [2021-05-22 02:21:15,471 INFO L226 Difference]: Without dead ends: 352 [2021-05-22 02:21:15,471 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 287.4ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:15,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2021-05-22 02:21:15,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 260. [2021-05-22 02:21:15,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 259 states have (on average 2.996138996138996) internal successors, (776), 259 states have internal predecessors, (776), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:15,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 776 transitions. [2021-05-22 02:21:15,476 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 776 transitions. Word has length 20 [2021-05-22 02:21:15,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:15,476 INFO L482 AbstractCegarLoop]: Abstraction has 260 states and 776 transitions. [2021-05-22 02:21:15,476 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:15,476 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 776 transitions. [2021-05-22 02:21:15,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:15,477 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:15,477 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:15,692 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-05-22 02:21:15,693 INFO L430 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:15,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:15,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1584321884, now seen corresponding path program 21 times [2021-05-22 02:21:15,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:15,693 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1811683399] [2021-05-22 02:21:15,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:15,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:15,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:15,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:15,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1811683399] [2021-05-22 02:21:15,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1811683399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:15,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138043919] [2021-05-22 02:21:15,839 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:15,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:21:15,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:15,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:15,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:15,923 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:15,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:15,924 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:15,936 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:15,937 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:15,938 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:21:16,014 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:16,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:16,016 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,026 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:16,028 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:16,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:16,029 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:16,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,041 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:16,102 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:16,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138043919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:16,102 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:16,102 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:16,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807406140] [2021-05-22 02:21:16,103 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:16,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:16,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:16,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:16,104 INFO L87 Difference]: Start difference. First operand 260 states and 776 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:16,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:16,442 INFO L93 Difference]: Finished difference Result 385 states and 1130 transitions. [2021-05-22 02:21:16,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:21:16,442 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:16,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:16,444 INFO L225 Difference]: With dead ends: 385 [2021-05-22 02:21:16,444 INFO L226 Difference]: Without dead ends: 370 [2021-05-22 02:21:16,444 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 338.0ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:16,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-05-22 02:21:16,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 263. [2021-05-22 02:21:16,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 3.0076335877862594) internal successors, (788), 262 states have internal predecessors, (788), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:16,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 788 transitions. [2021-05-22 02:21:16,450 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 788 transitions. Word has length 20 [2021-05-22 02:21:16,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:16,451 INFO L482 AbstractCegarLoop]: Abstraction has 263 states and 788 transitions. [2021-05-22 02:21:16,451 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:16,451 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 788 transitions. [2021-05-22 02:21:16,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:16,451 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:16,451 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:16,657 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:16,657 INFO L430 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:16,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:16,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1380717250, now seen corresponding path program 22 times [2021-05-22 02:21:16,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:16,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [557431063] [2021-05-22 02:21:16,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:16,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:16,812 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:16,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:16,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [557431063] [2021-05-22 02:21:16,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [557431063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:16,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547871280] [2021-05-22 02:21:16,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:16,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:16,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:16,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:16,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:16,904 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:16,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:16,905 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,914 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:16,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:16,916 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:21:16,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:16,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:16,953 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,964 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:16,966 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:16,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:16,967 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,976 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:16,978 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:16,978 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:48, output treesize:18 [2021-05-22 02:21:17,040 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:17,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547871280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:17,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:17,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:17,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562446613] [2021-05-22 02:21:17,042 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:17,042 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:17,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:17,042 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:17,042 INFO L87 Difference]: Start difference. First operand 263 states and 788 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:17,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:17,344 INFO L93 Difference]: Finished difference Result 379 states and 1115 transitions. [2021-05-22 02:21:17,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:21:17,344 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:17,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:17,346 INFO L225 Difference]: With dead ends: 379 [2021-05-22 02:21:17,346 INFO L226 Difference]: Without dead ends: 364 [2021-05-22 02:21:17,346 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 307.5ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:17,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2021-05-22 02:21:17,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 259. [2021-05-22 02:21:17,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 2.992248062015504) internal successors, (772), 258 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:17,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 772 transitions. [2021-05-22 02:21:17,351 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 772 transitions. Word has length 20 [2021-05-22 02:21:17,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:17,352 INFO L482 AbstractCegarLoop]: Abstraction has 259 states and 772 transitions. [2021-05-22 02:21:17,352 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:17,352 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 772 transitions. [2021-05-22 02:21:17,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:17,352 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:17,353 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:17,572 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable66,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:17,572 INFO L430 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:17,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:17,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1002272404, now seen corresponding path program 23 times [2021-05-22 02:21:17,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:17,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497880284] [2021-05-22 02:21:17,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:17,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:17,715 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:17,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:17,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497880284] [2021-05-22 02:21:17,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497880284] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:17,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531552172] [2021-05-22 02:21:17,715 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:17,760 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:17,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:17,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:17,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:17,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:17,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:17,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:17,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:17,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:17,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:17,830 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:17,873 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:17,880 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 4 dim-0 vars, and 2 xjuncts. [2021-05-22 02:21:17,881 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:103, output treesize:89 [2021-05-22 02:21:18,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:18,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:21:18,326 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:18,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:18,350 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:18,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:18,352 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:18,382 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:18,386 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:18,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:18,387 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:18,409 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:18,413 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:18,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-05-22 02:21:18,414 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:18,435 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:18,437 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:18,437 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:89, output treesize:27 [2021-05-22 02:21:18,500 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:18,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531552172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:18,500 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:18,500 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:18,500 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732086989] [2021-05-22 02:21:18,502 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:18,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:18,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:18,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:18,502 INFO L87 Difference]: Start difference. First operand 259 states and 772 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:18,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:18,939 INFO L93 Difference]: Finished difference Result 355 states and 1054 transitions. [2021-05-22 02:21:18,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:18,939 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:18,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:18,940 INFO L225 Difference]: With dead ends: 355 [2021-05-22 02:21:18,940 INFO L226 Difference]: Without dead ends: 340 [2021-05-22 02:21:18,941 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 410.2ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:21:18,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-05-22 02:21:18,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 269. [2021-05-22 02:21:18,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 3.0111940298507465) internal successors, (807), 268 states have internal predecessors, (807), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:18,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 807 transitions. [2021-05-22 02:21:18,946 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 807 transitions. Word has length 20 [2021-05-22 02:21:18,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:18,946 INFO L482 AbstractCegarLoop]: Abstraction has 269 states and 807 transitions. [2021-05-22 02:21:18,946 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:18,946 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 807 transitions. [2021-05-22 02:21:18,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:18,947 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:18,947 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:19,157 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-05-22 02:21:19,157 INFO L430 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:19,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:19,157 INFO L82 PathProgramCache]: Analyzing trace with hash 500481068, now seen corresponding path program 24 times [2021-05-22 02:21:19,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:19,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2001666250] [2021-05-22 02:21:19,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:19,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:19,309 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:19,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:19,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2001666250] [2021-05-22 02:21:19,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2001666250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:19,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211846034] [2021-05-22 02:21:19,310 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:19,342 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:19,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:19,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:19,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:19,407 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:19,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:19,409 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:19,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:19,425 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:19,425 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:21:19,537 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:19,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:19,539 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:19,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:19,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:19,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:19,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:19,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:19,564 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:19,564 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:15 [2021-05-22 02:21:19,624 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:19,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211846034] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:19,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:19,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:19,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305347600] [2021-05-22 02:21:19,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:19,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:19,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:19,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:19,625 INFO L87 Difference]: Start difference. First operand 269 states and 807 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:19,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:19,856 INFO L93 Difference]: Finished difference Result 357 states and 1051 transitions. [2021-05-22 02:21:19,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:19,856 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:19,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:19,857 INFO L225 Difference]: With dead ends: 357 [2021-05-22 02:21:19,857 INFO L226 Difference]: Without dead ends: 342 [2021-05-22 02:21:19,857 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 274.4ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:19,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 342 states. [2021-05-22 02:21:19,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 342 to 267. [2021-05-22 02:21:19,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 3.007518796992481) internal successors, (800), 266 states have internal predecessors, (800), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:19,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 800 transitions. [2021-05-22 02:21:19,865 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 800 transitions. Word has length 20 [2021-05-22 02:21:19,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:19,867 INFO L482 AbstractCegarLoop]: Abstraction has 267 states and 800 transitions. [2021-05-22 02:21:19,867 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:19,867 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 800 transitions. [2021-05-22 02:21:19,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:19,868 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:19,868 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:20,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable88,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:20,089 INFO L430 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:20,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:20,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1031364076, now seen corresponding path program 25 times [2021-05-22 02:21:20,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:20,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117956171] [2021-05-22 02:21:20,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:20,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:20,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:20,244 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:20,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117956171] [2021-05-22 02:21:20,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117956171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:20,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505563558] [2021-05-22 02:21:20,244 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:20,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:20,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:20,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:20,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:20,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:20,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:20,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:20,352 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:20,352 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:21:20,465 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:20,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:20,467 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:20,474 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:20,476 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:20,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:20,477 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:20,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:20,484 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:20,484 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:12 [2021-05-22 02:21:20,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:20,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505563558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:20,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:20,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:20,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1789902036] [2021-05-22 02:21:20,498 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:20,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:20,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:20,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:20,498 INFO L87 Difference]: Start difference. First operand 267 states and 800 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:20,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:20,670 INFO L93 Difference]: Finished difference Result 335 states and 985 transitions. [2021-05-22 02:21:20,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:20,671 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:20,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:20,672 INFO L225 Difference]: With dead ends: 335 [2021-05-22 02:21:20,672 INFO L226 Difference]: Without dead ends: 320 [2021-05-22 02:21:20,672 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 192.2ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:20,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 320 states. [2021-05-22 02:21:20,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 320 to 264. [2021-05-22 02:21:20,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 264 states, 263 states have (on average 3.0) internal successors, (789), 263 states have internal predecessors, (789), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:20,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 789 transitions. [2021-05-22 02:21:20,676 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 789 transitions. Word has length 20 [2021-05-22 02:21:20,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:20,677 INFO L482 AbstractCegarLoop]: Abstraction has 264 states and 789 transitions. [2021-05-22 02:21:20,677 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:20,677 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 789 transitions. [2021-05-22 02:21:20,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:20,677 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:20,678 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:20,884 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable95 [2021-05-22 02:21:20,884 INFO L430 AbstractCegarLoop]: === Iteration 38 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:20,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:20,884 INFO L82 PathProgramCache]: Analyzing trace with hash 472937802, now seen corresponding path program 26 times [2021-05-22 02:21:20,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:20,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [583668626] [2021-05-22 02:21:20,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:20,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:21,015 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:21,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [583668626] [2021-05-22 02:21:21,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [583668626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:21,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713323075] [2021-05-22 02:21:21,015 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:21,054 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:21,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:21,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:21,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:21,133 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:21,135 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,148 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:21,148 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:21:21,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:21,189 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,200 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,203 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:21,204 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,215 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,215 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:15 [2021-05-22 02:21:21,233 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:21,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713323075] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:21,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:21,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:21,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331359193] [2021-05-22 02:21:21,234 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:21,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:21,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:21,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:21,235 INFO L87 Difference]: Start difference. First operand 264 states and 789 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:21,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:21,413 INFO L93 Difference]: Finished difference Result 345 states and 1014 transitions. [2021-05-22 02:21:21,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:21,413 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:21,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:21,415 INFO L225 Difference]: With dead ends: 345 [2021-05-22 02:21:21,415 INFO L226 Difference]: Without dead ends: 330 [2021-05-22 02:21:21,415 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:21,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 330 states. [2021-05-22 02:21:21,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 330 to 263. [2021-05-22 02:21:21,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 2.9923664122137406) internal successors, (784), 262 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:21,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 784 transitions. [2021-05-22 02:21:21,420 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 784 transitions. Word has length 20 [2021-05-22 02:21:21,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:21,420 INFO L482 AbstractCegarLoop]: Abstraction has 263 states and 784 transitions. [2021-05-22 02:21:21,420 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:21,420 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 784 transitions. [2021-05-22 02:21:21,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:21,421 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:21,421 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:21,635 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:21,636 INFO L430 AbstractCegarLoop]: === Iteration 39 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:21,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:21,636 INFO L82 PathProgramCache]: Analyzing trace with hash -413101908, now seen corresponding path program 27 times [2021-05-22 02:21:21,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:21,636 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [535791876] [2021-05-22 02:21:21,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:21,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:21,768 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:21,769 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:21,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [535791876] [2021-05-22 02:21:21,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [535791876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:21,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789732863] [2021-05-22 02:21:21,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:21,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:21:21,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:21,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:21,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:21,891 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:21,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,899 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,900 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:21,900 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:21:21,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:21,929 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,940 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:21,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:21,944 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,956 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:21,957 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:21,957 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:12 [2021-05-22 02:21:21,981 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:21,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789732863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:21,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:21,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:21,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929989028] [2021-05-22 02:21:21,981 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:21,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:21,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:21,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:21,982 INFO L87 Difference]: Start difference. First operand 263 states and 784 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:22,187 INFO L93 Difference]: Finished difference Result 324 states and 957 transitions. [2021-05-22 02:21:22,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:22,187 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:22,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:22,188 INFO L225 Difference]: With dead ends: 324 [2021-05-22 02:21:22,188 INFO L226 Difference]: Without dead ends: 309 [2021-05-22 02:21:22,188 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 169.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:22,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 309 states. [2021-05-22 02:21:22,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 309 to 260. [2021-05-22 02:21:22,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 260 states, 259 states have (on average 2.996138996138996) internal successors, (776), 259 states have internal predecessors, (776), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 776 transitions. [2021-05-22 02:21:22,195 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 776 transitions. Word has length 20 [2021-05-22 02:21:22,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:22,196 INFO L482 AbstractCegarLoop]: Abstraction has 260 states and 776 transitions. [2021-05-22 02:21:22,196 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,196 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 776 transitions. [2021-05-22 02:21:22,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:22,197 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:22,197 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:22,412 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2021-05-22 02:21:22,412 INFO L430 AbstractCegarLoop]: === Iteration 40 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:22,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:22,413 INFO L82 PathProgramCache]: Analyzing trace with hash -2132086590, now seen corresponding path program 28 times [2021-05-22 02:21:22,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:22,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101588695] [2021-05-22 02:21:22,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:22,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:22,520 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:22,520 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:22,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101588695] [2021-05-22 02:21:22,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101588695] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:22,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271479680] [2021-05-22 02:21:22,521 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:22,554 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:22,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:22,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:22,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:22,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:22,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:22,603 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:22,610 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:22,612 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:22,612 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:21:22,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:22,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:22,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:22,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:22,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:22,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:22,663 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:22,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:22,674 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:22,674 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:15 [2021-05-22 02:21:22,696 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:22,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271479680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:22,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:22,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:22,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613457808] [2021-05-22 02:21:22,697 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:22,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:22,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:22,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:22,698 INFO L87 Difference]: Start difference. First operand 260 states and 776 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:22,860 INFO L93 Difference]: Finished difference Result 350 states and 1025 transitions. [2021-05-22 02:21:22,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:22,860 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:22,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:22,861 INFO L225 Difference]: With dead ends: 350 [2021-05-22 02:21:22,861 INFO L226 Difference]: Without dead ends: 335 [2021-05-22 02:21:22,861 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 135.9ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:22,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-05-22 02:21:22,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 259. [2021-05-22 02:21:22,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 258 states have (on average 2.992248062015504) internal successors, (772), 258 states have internal predecessors, (772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 772 transitions. [2021-05-22 02:21:22,865 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 772 transitions. Word has length 20 [2021-05-22 02:21:22,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:22,865 INFO L482 AbstractCegarLoop]: Abstraction has 259 states and 772 transitions. [2021-05-22 02:21:22,865 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:22,866 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 772 transitions. [2021-05-22 02:21:22,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:22,866 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:22,866 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:23,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:23,077 INFO L430 AbstractCegarLoop]: === Iteration 41 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:23,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:23,077 INFO L82 PathProgramCache]: Analyzing trace with hash -735699412, now seen corresponding path program 29 times [2021-05-22 02:21:23,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:23,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044145264] [2021-05-22 02:21:23,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:23,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:23,171 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:23,172 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:23,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044145264] [2021-05-22 02:21:23,172 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044145264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:23,172 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114800522] [2021-05-22 02:21:23,172 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:23,199 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:23,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:23,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:23,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:23,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:23,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:23,260 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:23,270 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:23,272 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:23,272 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:23,353 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:23,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:23,354 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:23,364 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:23,368 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:23,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:23,369 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:23,379 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:23,380 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:23,380 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:21:23,396 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:23,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1114800522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:23,396 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:23,396 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:23,396 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256125388] [2021-05-22 02:21:23,397 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:23,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:23,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:23,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:23,397 INFO L87 Difference]: Start difference. First operand 259 states and 772 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:23,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:23,549 INFO L93 Difference]: Finished difference Result 319 states and 943 transitions. [2021-05-22 02:21:23,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:23,550 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:23,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:23,551 INFO L225 Difference]: With dead ends: 319 [2021-05-22 02:21:23,551 INFO L226 Difference]: Without dead ends: 304 [2021-05-22 02:21:23,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 144.5ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:23,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-05-22 02:21:23,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 265. [2021-05-22 02:21:23,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 3.003787878787879) internal successors, (793), 264 states have internal predecessors, (793), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:23,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 793 transitions. [2021-05-22 02:21:23,556 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 793 transitions. Word has length 20 [2021-05-22 02:21:23,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:23,556 INFO L482 AbstractCegarLoop]: Abstraction has 265 states and 793 transitions. [2021-05-22 02:21:23,556 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:23,556 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 793 transitions. [2021-05-22 02:21:23,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:23,557 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:23,557 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:23,764 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2021-05-22 02:21:23,765 INFO L430 AbstractCegarLoop]: === Iteration 42 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:23,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:23,765 INFO L82 PathProgramCache]: Analyzing trace with hash -2065627574, now seen corresponding path program 30 times [2021-05-22 02:21:23,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:23,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50992280] [2021-05-22 02:21:23,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:23,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:23,881 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:23,881 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:23,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50992280] [2021-05-22 02:21:23,881 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50992280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:23,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1024905067] [2021-05-22 02:21:23,881 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:23,908 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:23,908 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:23,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:23,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:23,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:23,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:23,955 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:23,963 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:23,964 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:23,964 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:23,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:23,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:23,995 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,005 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:24,007 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:24,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:24,008 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,017 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:24,018 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,018 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:21:24,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:24,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1024905067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:24,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:24,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:24,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72418716] [2021-05-22 02:21:24,086 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:24,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:24,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:24,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:24,087 INFO L87 Difference]: Start difference. First operand 265 states and 793 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:24,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:24,312 INFO L93 Difference]: Finished difference Result 359 states and 1056 transitions. [2021-05-22 02:21:24,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:24,312 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:24,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:24,313 INFO L225 Difference]: With dead ends: 359 [2021-05-22 02:21:24,313 INFO L226 Difference]: Without dead ends: 344 [2021-05-22 02:21:24,314 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 197.9ms TimeCoverageRelationStatistics Valid=69, Invalid=273, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:24,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 344 states. [2021-05-22 02:21:24,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 344 to 262. [2021-05-22 02:21:24,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 2.992337164750958) internal successors, (781), 261 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:24,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 781 transitions. [2021-05-22 02:21:24,318 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 781 transitions. Word has length 20 [2021-05-22 02:21:24,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:24,318 INFO L482 AbstractCegarLoop]: Abstraction has 262 states and 781 transitions. [2021-05-22 02:21:24,318 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:24,318 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 781 transitions. [2021-05-22 02:21:24,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:24,319 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:24,319 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:24,540 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:24,540 INFO L430 AbstractCegarLoop]: === Iteration 43 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:24,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:24,541 INFO L82 PathProgramCache]: Analyzing trace with hash 1314258234, now seen corresponding path program 31 times [2021-05-22 02:21:24,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:24,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684235428] [2021-05-22 02:21:24,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:24,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:24,671 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:24,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:24,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684235428] [2021-05-22 02:21:24,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684235428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:24,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809675290] [2021-05-22 02:21:24,672 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:24,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:24,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:24,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:24,762 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:24,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:24,764 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,774 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:24,775 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:24,775 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:21:24,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:24,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:24,814 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:24,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:24,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:24,832 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:24,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:24,845 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:15 [2021-05-22 02:21:24,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:24,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809675290] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:24,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:24,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:24,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024666188] [2021-05-22 02:21:24,904 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:24,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:24,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:24,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:24,905 INFO L87 Difference]: Start difference. First operand 262 states and 781 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:25,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:25,136 INFO L93 Difference]: Finished difference Result 351 states and 1037 transitions. [2021-05-22 02:21:25,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:25,136 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:25,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:25,138 INFO L225 Difference]: With dead ends: 351 [2021-05-22 02:21:25,138 INFO L226 Difference]: Without dead ends: 336 [2021-05-22 02:21:25,138 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 219.3ms TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:25,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2021-05-22 02:21:25,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 262. [2021-05-22 02:21:25,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 262 states, 261 states have (on average 2.992337164750958) internal successors, (781), 261 states have internal predecessors, (781), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:25,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 262 states to 262 states and 781 transitions. [2021-05-22 02:21:25,142 INFO L78 Accepts]: Start accepts. Automaton has 262 states and 781 transitions. Word has length 20 [2021-05-22 02:21:25,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:25,142 INFO L482 AbstractCegarLoop]: Abstraction has 262 states and 781 transitions. [2021-05-22 02:21:25,142 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:25,142 INFO L276 IsEmpty]: Start isEmpty. Operand 262 states and 781 transitions. [2021-05-22 02:21:25,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:25,143 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:25,143 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:25,344 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable117 [2021-05-22 02:21:25,345 INFO L430 AbstractCegarLoop]: === Iteration 44 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:25,345 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:25,345 INFO L82 PathProgramCache]: Analyzing trace with hash 927087754, now seen corresponding path program 32 times [2021-05-22 02:21:25,345 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:25,345 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485868391] [2021-05-22 02:21:25,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:25,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:25,444 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:25,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:25,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485868391] [2021-05-22 02:21:25,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485868391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:25,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950895734] [2021-05-22 02:21:25,444 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:25,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:25,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:25,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:25,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:25,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:25,496 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:25,500 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:25,500 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:25,500 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:25,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:25,565 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:25,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:25,569 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:25,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:25,569 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:25,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:25,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1950895734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:25,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:25,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:25,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427511854] [2021-05-22 02:21:25,602 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:25,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:25,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:25,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:25,603 INFO L87 Difference]: Start difference. First operand 262 states and 781 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:26,123 INFO L93 Difference]: Finished difference Result 629 states and 1844 transitions. [2021-05-22 02:21:26,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:21:26,124 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:26,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:26,126 INFO L225 Difference]: With dead ends: 629 [2021-05-22 02:21:26,126 INFO L226 Difference]: Without dead ends: 614 [2021-05-22 02:21:26,126 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 419.0ms TimeCoverageRelationStatistics Valid=181, Invalid=689, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:21:26,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-05-22 02:21:26,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 276. [2021-05-22 02:21:26,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 276 states, 275 states have (on average 2.981818181818182) internal successors, (820), 275 states have internal predecessors, (820), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 276 states to 276 states and 820 transitions. [2021-05-22 02:21:26,131 INFO L78 Accepts]: Start accepts. Automaton has 276 states and 820 transitions. Word has length 20 [2021-05-22 02:21:26,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:26,131 INFO L482 AbstractCegarLoop]: Abstraction has 276 states and 820 transitions. [2021-05-22 02:21:26,131 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,131 INFO L276 IsEmpty]: Start isEmpty. Operand 276 states and 820 transitions. [2021-05-22 02:21:26,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:26,131 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:26,131 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:26,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2021-05-22 02:21:26,332 INFO L430 AbstractCegarLoop]: === Iteration 45 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:26,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:26,332 INFO L82 PathProgramCache]: Analyzing trace with hash -755048560, now seen corresponding path program 33 times [2021-05-22 02:21:26,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:26,332 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833738581] [2021-05-22 02:21:26,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:26,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:26,415 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:26,415 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:26,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833738581] [2021-05-22 02:21:26,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833738581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:26,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1002591596] [2021-05-22 02:21:26,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:26,460 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:21:26,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:26,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:26,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:26,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:26,486 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:26,491 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:26,492 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:26,492 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:26,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:26,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:26,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:26,513 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:26,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:26,514 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:26,526 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:26,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1002591596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:26,527 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:26,527 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:26,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87752411] [2021-05-22 02:21:26,527 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:26,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:26,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:26,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:26,528 INFO L87 Difference]: Start difference. First operand 276 states and 820 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:26,680 INFO L93 Difference]: Finished difference Result 469 states and 1378 transitions. [2021-05-22 02:21:26,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:26,680 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:26,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:26,682 INFO L225 Difference]: With dead ends: 469 [2021-05-22 02:21:26,682 INFO L226 Difference]: Without dead ends: 454 [2021-05-22 02:21:26,682 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 114.7ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:26,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-05-22 02:21:26,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 284. [2021-05-22 02:21:26,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 283 states have (on average 2.9964664310954063) internal successors, (848), 283 states have internal predecessors, (848), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 848 transitions. [2021-05-22 02:21:26,687 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 848 transitions. Word has length 20 [2021-05-22 02:21:26,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:26,687 INFO L482 AbstractCegarLoop]: Abstraction has 284 states and 848 transitions. [2021-05-22 02:21:26,687 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:26,687 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 848 transitions. [2021-05-22 02:21:26,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:26,687 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:26,687 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:26,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable119,34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:26,909 INFO L430 AbstractCegarLoop]: === Iteration 46 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:26,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:26,910 INFO L82 PathProgramCache]: Analyzing trace with hash -1020466382, now seen corresponding path program 34 times [2021-05-22 02:21:26,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:26,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649201801] [2021-05-22 02:21:26,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:26,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:26,982 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:26,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:26,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649201801] [2021-05-22 02:21:26,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649201801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:26,983 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953972261] [2021-05-22 02:21:26,983 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:27,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:27,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:27,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:27,011 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:27,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:27,055 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,059 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:27,060 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,060 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:27,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:27,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,076 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:27,076 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:27,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,077 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:27,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953972261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:27,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:27,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:27,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716533129] [2021-05-22 02:21:27,091 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:27,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:27,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:27,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:27,091 INFO L87 Difference]: Start difference. First operand 284 states and 848 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:27,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:27,245 INFO L93 Difference]: Finished difference Result 481 states and 1408 transitions. [2021-05-22 02:21:27,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:27,245 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:27,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:27,247 INFO L225 Difference]: With dead ends: 481 [2021-05-22 02:21:27,247 INFO L226 Difference]: Without dead ends: 466 [2021-05-22 02:21:27,247 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 96.5ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:27,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-05-22 02:21:27,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 280. [2021-05-22 02:21:27,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 280 states, 279 states have (on average 2.982078853046595) internal successors, (832), 279 states have internal predecessors, (832), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:27,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 832 transitions. [2021-05-22 02:21:27,251 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 832 transitions. Word has length 20 [2021-05-22 02:21:27,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:27,251 INFO L482 AbstractCegarLoop]: Abstraction has 280 states and 832 transitions. [2021-05-22 02:21:27,251 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:27,251 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 832 transitions. [2021-05-22 02:21:27,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:27,252 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:27,252 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:27,463 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:27,464 INFO L430 AbstractCegarLoop]: === Iteration 47 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:27,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:27,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1125704378, now seen corresponding path program 35 times [2021-05-22 02:21:27,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:27,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112253710] [2021-05-22 02:21:27,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:27,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:27,550 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:27,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:27,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112253710] [2021-05-22 02:21:27,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112253710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:27,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [385107410] [2021-05-22 02:21:27,551 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:27,577 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:27,578 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:27,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:27,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:27,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:27,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:27,625 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,625 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:27,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:27,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:27,651 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:27,665 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:27,665 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:27,666 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:27,666 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:35 [2021-05-22 02:21:27,757 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:27,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [385107410] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:27,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:27,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:27,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946884223] [2021-05-22 02:21:27,757 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:27,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:27,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:27,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:27,758 INFO L87 Difference]: Start difference. First operand 280 states and 832 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:28,019 INFO L93 Difference]: Finished difference Result 470 states and 1380 transitions. [2021-05-22 02:21:28,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:21:28,019 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:28,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:28,021 INFO L225 Difference]: With dead ends: 470 [2021-05-22 02:21:28,021 INFO L226 Difference]: Without dead ends: 455 [2021-05-22 02:21:28,022 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 231.3ms TimeCoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:28,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 455 states. [2021-05-22 02:21:28,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 455 to 272. [2021-05-22 02:21:28,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 2.981549815498155) internal successors, (808), 271 states have internal predecessors, (808), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 808 transitions. [2021-05-22 02:21:28,030 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 808 transitions. Word has length 20 [2021-05-22 02:21:28,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:28,030 INFO L482 AbstractCegarLoop]: Abstraction has 272 states and 808 transitions. [2021-05-22 02:21:28,031 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,031 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 808 transitions. [2021-05-22 02:21:28,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:28,031 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:28,031 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:28,240 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,36 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:28,241 INFO L430 AbstractCegarLoop]: === Iteration 48 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:28,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:28,241 INFO L82 PathProgramCache]: Analyzing trace with hash 2067877130, now seen corresponding path program 36 times [2021-05-22 02:21:28,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:28,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263073979] [2021-05-22 02:21:28,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:28,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:28,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:28,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263073979] [2021-05-22 02:21:28,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263073979] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:28,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1404307582] [2021-05-22 02:21:28,313 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:28,358 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:28,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:28,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:28,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:28,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:28,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:28,396 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,397 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:28,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:28,418 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:28,421 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:28,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,421 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:28,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:28,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1404307582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:28,434 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:28,434 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:28,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71080128] [2021-05-22 02:21:28,434 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:28,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:28,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:28,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:28,434 INFO L87 Difference]: Start difference. First operand 272 states and 808 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:28,597 INFO L93 Difference]: Finished difference Result 487 states and 1433 transitions. [2021-05-22 02:21:28,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:28,597 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:28,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:28,599 INFO L225 Difference]: With dead ends: 487 [2021-05-22 02:21:28,599 INFO L226 Difference]: Without dead ends: 472 [2021-05-22 02:21:28,599 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 105.8ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:28,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-22 02:21:28,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 287. [2021-05-22 02:21:28,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 2.9965034965034967) internal successors, (857), 286 states have internal predecessors, (857), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 857 transitions. [2021-05-22 02:21:28,606 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 857 transitions. Word has length 20 [2021-05-22 02:21:28,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:28,606 INFO L482 AbstractCegarLoop]: Abstraction has 287 states and 857 transitions. [2021-05-22 02:21:28,606 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:28,606 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 857 transitions. [2021-05-22 02:21:28,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:28,607 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:28,607 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:28,820 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable125 [2021-05-22 02:21:28,821 INFO L430 AbstractCegarLoop]: === Iteration 49 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:28,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:28,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1802459308, now seen corresponding path program 37 times [2021-05-22 02:21:28,821 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:28,821 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684362601] [2021-05-22 02:21:28,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:28,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:28,891 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:28,891 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:28,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684362601] [2021-05-22 02:21:28,891 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684362601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:28,891 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477237428] [2021-05-22 02:21:28,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:28,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:28,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:28,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:28,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:28,957 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,961 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:28,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,962 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:21:28,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:28,968 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:28,973 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:28,973 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:28,973 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:28,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:28,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1477237428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:28,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:28,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:28,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617949753] [2021-05-22 02:21:28,990 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:28,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:28,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:28,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:28,990 INFO L87 Difference]: Start difference. First operand 287 states and 857 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:29,146 INFO L93 Difference]: Finished difference Result 499 states and 1463 transitions. [2021-05-22 02:21:29,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:29,147 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:29,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:29,148 INFO L225 Difference]: With dead ends: 499 [2021-05-22 02:21:29,149 INFO L226 Difference]: Without dead ends: 484 [2021-05-22 02:21:29,149 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 103.1ms TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:29,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-05-22 02:21:29,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 283. [2021-05-22 02:21:29,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 2.982269503546099) internal successors, (841), 282 states have internal predecessors, (841), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 841 transitions. [2021-05-22 02:21:29,155 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 841 transitions. Word has length 20 [2021-05-22 02:21:29,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:29,155 INFO L482 AbstractCegarLoop]: Abstraction has 283 states and 841 transitions. [2021-05-22 02:21:29,155 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,155 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 841 transitions. [2021-05-22 02:21:29,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:29,156 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:29,156 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:29,364 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable129 [2021-05-22 02:21:29,365 INFO L430 AbstractCegarLoop]: === Iteration 50 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:29,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:29,365 INFO L82 PathProgramCache]: Analyzing trace with hash -346337228, now seen corresponding path program 38 times [2021-05-22 02:21:29,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:29,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166210508] [2021-05-22 02:21:29,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:29,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:29,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:29,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:29,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166210508] [2021-05-22 02:21:29,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166210508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:29,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186961375] [2021-05-22 02:21:29,429 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:29,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:29,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:29,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:29,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:29,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:29,479 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:29,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:29,484 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:29,484 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:29,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:29,499 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:29,502 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:29,502 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:29,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:29,503 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:21:29,515 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:29,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1186961375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:29,515 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:29,515 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:21:29,515 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086156082] [2021-05-22 02:21:29,515 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:21:29,515 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:29,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:21:29,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:29,516 INFO L87 Difference]: Start difference. First operand 283 states and 841 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:29,655 INFO L93 Difference]: Finished difference Result 488 states and 1435 transitions. [2021-05-22 02:21:29,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:29,655 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:29,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:29,656 INFO L225 Difference]: With dead ends: 488 [2021-05-22 02:21:29,656 INFO L226 Difference]: Without dead ends: 473 [2021-05-22 02:21:29,656 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 103.9ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:29,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-05-22 02:21:29,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 279. [2021-05-22 02:21:29,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 2.9820143884892087) internal successors, (829), 278 states have internal predecessors, (829), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 829 transitions. [2021-05-22 02:21:29,661 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 829 transitions. Word has length 20 [2021-05-22 02:21:29,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:29,661 INFO L482 AbstractCegarLoop]: Abstraction has 279 states and 829 transitions. [2021-05-22 02:21:29,661 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:29,661 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 829 transitions. [2021-05-22 02:21:29,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:29,662 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:29,662 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:29,862 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable130,39 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:29,862 INFO L430 AbstractCegarLoop]: === Iteration 51 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:29,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:29,863 INFO L82 PathProgramCache]: Analyzing trace with hash 160009038, now seen corresponding path program 39 times [2021-05-22 02:21:29,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:29,863 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140469065] [2021-05-22 02:21:29,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:29,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:29,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:29,943 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:29,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140469065] [2021-05-22 02:21:29,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140469065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:29,944 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323358065] [2021-05-22 02:21:29,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:29,990 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:21:29,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:29,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:29,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:30,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:30,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,015 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:30,015 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,015 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:21:30,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:30,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:30,037 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:30,037 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,037 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:21:30,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:30,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323358065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:30,052 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:30,053 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:21:30,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293217731] [2021-05-22 02:21:30,053 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:21:30,053 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:30,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:21:30,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:30,053 INFO L87 Difference]: Start difference. First operand 279 states and 829 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:30,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:30,216 INFO L93 Difference]: Finished difference Result 592 states and 1740 transitions. [2021-05-22 02:21:30,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:30,216 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:30,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:30,218 INFO L225 Difference]: With dead ends: 592 [2021-05-22 02:21:30,218 INFO L226 Difference]: Without dead ends: 577 [2021-05-22 02:21:30,218 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 110.9ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:30,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-05-22 02:21:30,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 301. [2021-05-22 02:21:30,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 300 states have (on average 2.98) internal successors, (894), 300 states have internal predecessors, (894), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:30,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 894 transitions. [2021-05-22 02:21:30,223 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 894 transitions. Word has length 20 [2021-05-22 02:21:30,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:30,223 INFO L482 AbstractCegarLoop]: Abstraction has 301 states and 894 transitions. [2021-05-22 02:21:30,223 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:30,223 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 894 transitions. [2021-05-22 02:21:30,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:30,223 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:30,223 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:30,424 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable131,40 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:30,424 INFO L430 AbstractCegarLoop]: === Iteration 52 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:30,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:30,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1360504170, now seen corresponding path program 40 times [2021-05-22 02:21:30,424 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:30,424 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241172275] [2021-05-22 02:21:30,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:30,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:30,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:30,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:30,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241172275] [2021-05-22 02:21:30,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241172275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:30,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536198320] [2021-05-22 02:21:30,578 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:30,604 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:30,604 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:30,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:30,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:30,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:30,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:30,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,684 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:30,685 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:30,685 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:30,761 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:30,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:30,763 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:30,773 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:30,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:30,774 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,781 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:30,782 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:30,782 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:21:30,809 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:30,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536198320] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:30,810 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:30,810 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:30,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864830876] [2021-05-22 02:21:30,810 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:30,810 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:30,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:30,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:30,810 INFO L87 Difference]: Start difference. First operand 301 states and 894 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:31,089 INFO L93 Difference]: Finished difference Result 437 states and 1290 transitions. [2021-05-22 02:21:31,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:31,089 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:31,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:31,090 INFO L225 Difference]: With dead ends: 437 [2021-05-22 02:21:31,090 INFO L226 Difference]: Without dead ends: 422 [2021-05-22 02:21:31,090 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 283.8ms TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:31,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 422 states. [2021-05-22 02:21:31,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 422 to 309. [2021-05-22 02:21:31,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 2.9837662337662336) internal successors, (919), 308 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 919 transitions. [2021-05-22 02:21:31,096 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 919 transitions. Word has length 20 [2021-05-22 02:21:31,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:31,096 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 919 transitions. [2021-05-22 02:21:31,096 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,096 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 919 transitions. [2021-05-22 02:21:31,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:31,097 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:31,097 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:31,318 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable132,41 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:31,318 INFO L430 AbstractCegarLoop]: === Iteration 53 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:31,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:31,319 INFO L82 PathProgramCache]: Analyzing trace with hash 858712834, now seen corresponding path program 41 times [2021-05-22 02:21:31,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:31,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719074411] [2021-05-22 02:21:31,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:31,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:31,455 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:31,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:31,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719074411] [2021-05-22 02:21:31,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719074411] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:31,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1015034540] [2021-05-22 02:21:31,456 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:31,495 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:31,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:31,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:31,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:31,567 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:31,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:31,568 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:31,576 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:31,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:31,577 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:31,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:31,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:31,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:31,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:31,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:31,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:31,615 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:31,623 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:31,623 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:31,623 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:31,670 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:31,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1015034540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:31,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:31,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:31,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [102420279] [2021-05-22 02:21:31,670 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:31,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:31,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:31,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:31,671 INFO L87 Difference]: Start difference. First operand 309 states and 919 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:31,990 INFO L93 Difference]: Finished difference Result 443 states and 1303 transitions. [2021-05-22 02:21:31,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:31,991 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:31,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:31,992 INFO L225 Difference]: With dead ends: 443 [2021-05-22 02:21:31,992 INFO L226 Difference]: Without dead ends: 428 [2021-05-22 02:21:31,992 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 257.6ms TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:31,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 428 states. [2021-05-22 02:21:31,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 428 to 307. [2021-05-22 02:21:31,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 2.980392156862745) internal successors, (912), 306 states have internal predecessors, (912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 912 transitions. [2021-05-22 02:21:31,996 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 912 transitions. Word has length 20 [2021-05-22 02:21:31,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:31,996 INFO L482 AbstractCegarLoop]: Abstraction has 307 states and 912 transitions. [2021-05-22 02:21:31,996 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:31,996 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 912 transitions. [2021-05-22 02:21:31,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:31,996 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:31,996 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:32,197 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable137 [2021-05-22 02:21:32,197 INFO L430 AbstractCegarLoop]: === Iteration 54 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:32,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:32,197 INFO L82 PathProgramCache]: Analyzing trace with hash -1248071286, now seen corresponding path program 42 times [2021-05-22 02:21:32,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:32,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [912935894] [2021-05-22 02:21:32,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:32,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:32,320 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:32,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:32,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [912935894] [2021-05-22 02:21:32,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [912935894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:32,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2137907110] [2021-05-22 02:21:32,320 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:32,347 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:32,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:32,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:32,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:32,441 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:32,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:32,442 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:32,449 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:32,455 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:32,456 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:32,487 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:32,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:32,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:32,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:32,513 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:32,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:32,514 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:32,522 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:32,523 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:32,523 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:32,581 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:32,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2137907110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:32,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:32,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:32,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653026226] [2021-05-22 02:21:32,582 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:32,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:32,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:32,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:32,582 INFO L87 Difference]: Start difference. First operand 307 states and 912 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:32,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:32,922 INFO L93 Difference]: Finished difference Result 450 states and 1327 transitions. [2021-05-22 02:21:32,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:32,922 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:32,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:32,923 INFO L225 Difference]: With dead ends: 450 [2021-05-22 02:21:32,923 INFO L226 Difference]: Without dead ends: 435 [2021-05-22 02:21:32,923 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 321.9ms TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:21:32,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2021-05-22 02:21:32,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 305. [2021-05-22 02:21:32,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 2.9835526315789473) internal successors, (907), 304 states have internal predecessors, (907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:32,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 907 transitions. [2021-05-22 02:21:32,928 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 907 transitions. Word has length 20 [2021-05-22 02:21:32,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:32,928 INFO L482 AbstractCegarLoop]: Abstraction has 305 states and 907 transitions. [2021-05-22 02:21:32,928 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:32,929 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 907 transitions. [2021-05-22 02:21:32,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:32,929 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:32,929 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:33,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable138,43 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:33,141 INFO L430 AbstractCegarLoop]: === Iteration 55 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:33,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:33,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1212563188, now seen corresponding path program 43 times [2021-05-22 02:21:33,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:33,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [77061185] [2021-05-22 02:21:33,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:33,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:33,249 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:33,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:33,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [77061185] [2021-05-22 02:21:33,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [77061185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:33,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103312753] [2021-05-22 02:21:33,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:33,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:33,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:33,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:33,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:33,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:33,338 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:33,346 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:33,348 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:33,348 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:33,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:33,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:33,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:33,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:33,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:33,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:33,480 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:33,487 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:33,488 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:33,488 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:21:33,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:33,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103312753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:33,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:33,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:21:33,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964672066] [2021-05-22 02:21:33,498 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:21:33,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:33,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:21:33,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:33,498 INFO L87 Difference]: Start difference. First operand 305 states and 907 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:33,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:33,674 INFO L93 Difference]: Finished difference Result 387 states and 1133 transitions. [2021-05-22 02:21:33,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:33,675 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:33,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:33,676 INFO L225 Difference]: With dead ends: 387 [2021-05-22 02:21:33,676 INFO L226 Difference]: Without dead ends: 372 [2021-05-22 02:21:33,676 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 173.3ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:33,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2021-05-22 02:21:33,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 311. [2021-05-22 02:21:33,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 3.0) internal successors, (930), 310 states have internal predecessors, (930), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:33,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 930 transitions. [2021-05-22 02:21:33,681 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 930 transitions. Word has length 20 [2021-05-22 02:21:33,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:33,682 INFO L482 AbstractCegarLoop]: Abstraction has 311 states and 930 transitions. [2021-05-22 02:21:33,682 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:33,682 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 930 transitions. [2021-05-22 02:21:33,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:33,682 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:33,682 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:33,896 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable139,44 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:33,897 INFO L430 AbstractCegarLoop]: === Iteration 56 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:33,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:33,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1714354524, now seen corresponding path program 44 times [2021-05-22 02:21:33,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:33,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345594684] [2021-05-22 02:21:33,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:33,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:34,005 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:34,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:34,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345594684] [2021-05-22 02:21:34,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345594684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:34,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930581602] [2021-05-22 02:21:34,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:34,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:34,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:34,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:34,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:34,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:34,093 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,102 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,103 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:34,103 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:34,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:34,178 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,188 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:34,191 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,202 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,202 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:34,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:34,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930581602] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:34,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:34,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:34,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44080649] [2021-05-22 02:21:34,222 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:34,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:34,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:34,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:34,223 INFO L87 Difference]: Start difference. First operand 311 states and 930 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:34,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:34,429 INFO L93 Difference]: Finished difference Result 381 states and 1120 transitions. [2021-05-22 02:21:34,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:34,430 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:34,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:34,431 INFO L225 Difference]: With dead ends: 381 [2021-05-22 02:21:34,431 INFO L226 Difference]: Without dead ends: 366 [2021-05-22 02:21:34,431 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 148.9ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:34,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-05-22 02:21:34,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 309. [2021-05-22 02:21:34,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 2.9967532467532467) internal successors, (923), 308 states have internal predecessors, (923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:34,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 923 transitions. [2021-05-22 02:21:34,435 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 923 transitions. Word has length 20 [2021-05-22 02:21:34,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:34,435 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 923 transitions. [2021-05-22 02:21:34,435 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:34,435 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 923 transitions. [2021-05-22 02:21:34,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:34,436 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:34,436 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:34,641 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable144 [2021-05-22 02:21:34,642 INFO L430 AbstractCegarLoop]: === Iteration 57 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:34,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:34,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1048767628, now seen corresponding path program 45 times [2021-05-22 02:21:34,642 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:34,642 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298947896] [2021-05-22 02:21:34,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:34,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:34,765 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:34,765 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:34,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298947896] [2021-05-22 02:21:34,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298947896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:34,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048044141] [2021-05-22 02:21:34,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:34,803 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:21:34,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:34,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:34,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:34,863 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:34,864 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,872 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,874 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:34,874 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:34,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:34,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,957 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,959 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:34,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:34,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,968 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:34,969 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:34,970 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:21:35,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:35,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048044141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:35,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:35,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:35,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926061946] [2021-05-22 02:21:35,018 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:35,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:35,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:35,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:35,019 INFO L87 Difference]: Start difference. First operand 309 states and 923 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:35,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:35,363 INFO L93 Difference]: Finished difference Result 449 states and 1320 transitions. [2021-05-22 02:21:35,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:35,364 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:35,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:35,365 INFO L225 Difference]: With dead ends: 449 [2021-05-22 02:21:35,365 INFO L226 Difference]: Without dead ends: 434 [2021-05-22 02:21:35,365 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 278.3ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:35,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-05-22 02:21:35,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 306. [2021-05-22 02:21:35,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 306 states, 305 states have (on average 2.9901639344262296) internal successors, (912), 305 states have internal predecessors, (912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:35,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 912 transitions. [2021-05-22 02:21:35,373 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 912 transitions. Word has length 20 [2021-05-22 02:21:35,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:35,373 INFO L482 AbstractCegarLoop]: Abstraction has 306 states and 912 transitions. [2021-05-22 02:21:35,373 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:35,373 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 912 transitions. [2021-05-22 02:21:35,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:35,373 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:35,373 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:35,574 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable145 [2021-05-22 02:21:35,574 INFO L430 AbstractCegarLoop]: === Iteration 58 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:35,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:35,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1741897790, now seen corresponding path program 46 times [2021-05-22 02:21:35,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:35,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700707621] [2021-05-22 02:21:35,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:35,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:35,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:35,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:35,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700707621] [2021-05-22 02:21:35,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700707621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:35,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793670069] [2021-05-22 02:21:35,698 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:35,730 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:35,730 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:35,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:35,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:35,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:35,787 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:35,788 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:35,798 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:35,799 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:35,799 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:35,835 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:35,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:35,837 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:35,849 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:35,853 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:35,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:35,854 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:35,866 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:35,867 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:35,867 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:21:35,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:35,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793670069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:35,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:35,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:35,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251985407] [2021-05-22 02:21:35,888 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:35,888 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:35,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:35,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:35,889 INFO L87 Difference]: Start difference. First operand 306 states and 912 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:36,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:36,090 INFO L93 Difference]: Finished difference Result 389 states and 1142 transitions. [2021-05-22 02:21:36,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:36,090 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:36,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:36,091 INFO L225 Difference]: With dead ends: 389 [2021-05-22 02:21:36,091 INFO L226 Difference]: Without dead ends: 374 [2021-05-22 02:21:36,091 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 162.0ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:36,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-05-22 02:21:36,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 305. [2021-05-22 02:21:36,096 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 2.9835526315789473) internal successors, (907), 304 states have internal predecessors, (907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:36,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 907 transitions. [2021-05-22 02:21:36,097 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 907 transitions. Word has length 20 [2021-05-22 02:21:36,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:36,097 INFO L482 AbstractCegarLoop]: Abstraction has 305 states and 907 transitions. [2021-05-22 02:21:36,097 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:36,097 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 907 transitions. [2021-05-22 02:21:36,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:36,098 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:36,098 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:36,316 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable150 [2021-05-22 02:21:36,317 INFO L430 AbstractCegarLoop]: === Iteration 59 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:36,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:36,317 INFO L82 PathProgramCache]: Analyzing trace with hash -2101912532, now seen corresponding path program 47 times [2021-05-22 02:21:36,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:36,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721652024] [2021-05-22 02:21:36,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:36,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:36,447 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:36,447 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:36,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721652024] [2021-05-22 02:21:36,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721652024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:36,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [979146927] [2021-05-22 02:21:36,447 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:36,480 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:36,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:36,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:36,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:36,531 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:36,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:36,533 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:36,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:36,543 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:36,543 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:36,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:36,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:36,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:36,637 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:36,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:36,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:36,640 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:36,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:36,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:36,649 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:21:36,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:36,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [979146927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:36,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:36,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:36,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102305874] [2021-05-22 02:21:36,696 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:36,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:36,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:36,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:36,696 INFO L87 Difference]: Start difference. First operand 305 states and 907 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:37,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:37,067 INFO L93 Difference]: Finished difference Result 468 states and 1372 transitions. [2021-05-22 02:21:37,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:37,068 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:37,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:37,069 INFO L225 Difference]: With dead ends: 468 [2021-05-22 02:21:37,069 INFO L226 Difference]: Without dead ends: 453 [2021-05-22 02:21:37,069 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 333.5ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:21:37,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2021-05-22 02:21:37,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 308. [2021-05-22 02:21:37,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 2.993485342019544) internal successors, (919), 307 states have internal predecessors, (919), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:37,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 919 transitions. [2021-05-22 02:21:37,074 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 919 transitions. Word has length 20 [2021-05-22 02:21:37,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:37,074 INFO L482 AbstractCegarLoop]: Abstraction has 308 states and 919 transitions. [2021-05-22 02:21:37,074 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:37,074 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 919 transitions. [2021-05-22 02:21:37,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:37,075 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:37,075 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:37,275 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable151,48 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:37,275 INFO L430 AbstractCegarLoop]: === Iteration 60 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:37,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:37,275 INFO L82 PathProgramCache]: Analyzing trace with hash 863126602, now seen corresponding path program 48 times [2021-05-22 02:21:37,275 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:37,275 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489326606] [2021-05-22 02:21:37,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:37,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:37,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:37,419 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:37,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489326606] [2021-05-22 02:21:37,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489326606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:37,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367825302] [2021-05-22 02:21:37,419 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:37,444 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:37,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:37,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:37,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:37,489 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:37,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:37,495 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:37,502 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:37,503 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:37,504 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:21:37,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:37,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:37,537 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:37,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:37,549 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:37,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:37,550 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:37,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:37,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:37,559 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:21:37,623 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:37,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367825302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:37,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:37,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:37,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122360724] [2021-05-22 02:21:37,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:37,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:37,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:37,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:37,624 INFO L87 Difference]: Start difference. First operand 308 states and 919 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:38,025 INFO L93 Difference]: Finished difference Result 462 states and 1357 transitions. [2021-05-22 02:21:38,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:38,025 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:38,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:38,026 INFO L225 Difference]: With dead ends: 462 [2021-05-22 02:21:38,026 INFO L226 Difference]: Without dead ends: 447 [2021-05-22 02:21:38,026 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 318.8ms TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:21:38,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2021-05-22 02:21:38,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 304. [2021-05-22 02:21:38,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 303 states have (on average 2.98019801980198) internal successors, (903), 303 states have internal predecessors, (903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 903 transitions. [2021-05-22 02:21:38,030 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 903 transitions. Word has length 20 [2021-05-22 02:21:38,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:38,030 INFO L482 AbstractCegarLoop]: Abstraction has 304 states and 903 transitions. [2021-05-22 02:21:38,031 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,031 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 903 transitions. [2021-05-22 02:21:38,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:38,031 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:38,031 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:38,231 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable152,49 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:38,232 INFO L430 AbstractCegarLoop]: === Iteration 61 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:38,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:38,232 INFO L82 PathProgramCache]: Analyzing trace with hash 484681756, now seen corresponding path program 49 times [2021-05-22 02:21:38,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:38,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [593479755] [2021-05-22 02:21:38,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:38,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:38,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:38,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:38,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [593479755] [2021-05-22 02:21:38,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [593479755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:38,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632535959] [2021-05-22 02:21:38,357 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:38,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:38,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:38,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:38,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:38,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:38,426 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:38,432 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:38,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:38,432 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:21:38,490 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:21:38,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:38,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:38,498 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:38,499 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:38,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:38,501 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:38,505 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:38,506 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:38,506 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:9 [2021-05-22 02:21:38,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:38,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632535959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:38,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:38,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:38,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218023745] [2021-05-22 02:21:38,533 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:38,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:38,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:38,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:38,534 INFO L87 Difference]: Start difference. First operand 304 states and 903 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:38,790 INFO L93 Difference]: Finished difference Result 421 states and 1243 transitions. [2021-05-22 02:21:38,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:21:38,791 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:38,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:38,792 INFO L225 Difference]: With dead ends: 421 [2021-05-22 02:21:38,792 INFO L226 Difference]: Without dead ends: 406 [2021-05-22 02:21:38,792 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 237.4ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:38,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-05-22 02:21:38,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 314. [2021-05-22 02:21:38,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 313 states have (on average 2.9968051118210863) internal successors, (938), 313 states have internal predecessors, (938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 938 transitions. [2021-05-22 02:21:38,797 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 938 transitions. Word has length 20 [2021-05-22 02:21:38,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:38,797 INFO L482 AbstractCegarLoop]: Abstraction has 314 states and 938 transitions. [2021-05-22 02:21:38,797 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:38,797 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 938 transitions. [2021-05-22 02:21:38,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:38,798 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:38,798 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:39,008 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable153,50 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:39,009 INFO L430 AbstractCegarLoop]: === Iteration 62 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:39,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:39,009 INFO L82 PathProgramCache]: Analyzing trace with hash -17109580, now seen corresponding path program 50 times [2021-05-22 02:21:39,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:39,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857376711] [2021-05-22 02:21:39,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:39,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:39,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:39,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:39,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857376711] [2021-05-22 02:21:39,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857376711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:39,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1210015494] [2021-05-22 02:21:39,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:39,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:39,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:39,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:39,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:39,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:39,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:39,193 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,199 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:39,200 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,200 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:21:39,236 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:21:39,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:39,241 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:39,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:39,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:39,250 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:39,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,256 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:21:39,300 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:39,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1210015494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:39,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:39,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:39,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1523310528] [2021-05-22 02:21:39,300 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:39,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:39,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:39,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:39,301 INFO L87 Difference]: Start difference. First operand 314 states and 938 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:39,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:39,558 INFO L93 Difference]: Finished difference Result 427 states and 1256 transitions. [2021-05-22 02:21:39,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:21:39,558 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:39,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:39,559 INFO L225 Difference]: With dead ends: 427 [2021-05-22 02:21:39,559 INFO L226 Difference]: Without dead ends: 412 [2021-05-22 02:21:39,559 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 234.8ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:39,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2021-05-22 02:21:39,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 312. [2021-05-22 02:21:39,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 2.9935691318327975) internal successors, (931), 311 states have internal predecessors, (931), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:39,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 931 transitions. [2021-05-22 02:21:39,580 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 931 transitions. Word has length 20 [2021-05-22 02:21:39,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:39,580 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 931 transitions. [2021-05-22 02:21:39,580 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:39,580 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 931 transitions. [2021-05-22 02:21:39,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:39,581 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:39,581 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:39,803 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable157 [2021-05-22 02:21:39,803 INFO L430 AbstractCegarLoop]: === Iteration 63 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:39,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:39,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1548954724, now seen corresponding path program 51 times [2021-05-22 02:21:39,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:39,804 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364378860] [2021-05-22 02:21:39,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:39,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:39,902 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:39,902 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:39,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364378860] [2021-05-22 02:21:39,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364378860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:39,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394140658] [2021-05-22 02:21:39,902 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:39,927 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:21:39,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:39,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:39,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:39,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:39,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:39,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:39,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:39,982 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:39,982 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:40,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:40,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:40,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,054 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:40,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:40,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:40,057 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:40,065 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,065 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:12 [2021-05-22 02:21:40,077 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:40,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394140658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:40,077 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:40,077 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:40,077 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011791859] [2021-05-22 02:21:40,077 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:40,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:40,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:40,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:40,078 INFO L87 Difference]: Start difference. First operand 312 states and 931 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:40,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:40,287 INFO L93 Difference]: Finished difference Result 380 states and 1116 transitions. [2021-05-22 02:21:40,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:40,288 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:40,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:40,289 INFO L225 Difference]: With dead ends: 380 [2021-05-22 02:21:40,289 INFO L226 Difference]: Without dead ends: 365 [2021-05-22 02:21:40,289 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 141.1ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:40,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2021-05-22 02:21:40,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 309. [2021-05-22 02:21:40,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 2.987012987012987) internal successors, (920), 308 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:40,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 920 transitions. [2021-05-22 02:21:40,294 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 920 transitions. Word has length 20 [2021-05-22 02:21:40,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:40,294 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 920 transitions. [2021-05-22 02:21:40,295 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:40,295 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 920 transitions. [2021-05-22 02:21:40,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:40,295 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:40,295 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:40,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable158 [2021-05-22 02:21:40,505 INFO L430 AbstractCegarLoop]: === Iteration 64 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:40,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:40,505 INFO L82 PathProgramCache]: Analyzing trace with hash -44652846, now seen corresponding path program 52 times [2021-05-22 02:21:40,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:40,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139299758] [2021-05-22 02:21:40,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:40,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:40,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:40,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:40,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139299758] [2021-05-22 02:21:40,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139299758] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:40,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [929903024] [2021-05-22 02:21:40,629 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:40,660 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:40,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:40,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:40,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:40,723 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:40,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:40,725 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,735 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:40,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:40,736 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:21:40,771 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:40,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:40,773 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:40,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:40,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:40,789 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:40,801 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:40,801 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:15 [2021-05-22 02:21:40,823 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:40,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [929903024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:40,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:40,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:40,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622823973] [2021-05-22 02:21:40,824 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:40,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:40,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:40,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:40,825 INFO L87 Difference]: Start difference. First operand 309 states and 920 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:41,007 INFO L93 Difference]: Finished difference Result 390 states and 1145 transitions. [2021-05-22 02:21:41,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:41,007 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:41,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:41,008 INFO L225 Difference]: With dead ends: 390 [2021-05-22 02:21:41,008 INFO L226 Difference]: Without dead ends: 375 [2021-05-22 02:21:41,008 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 167.0ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:41,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2021-05-22 02:21:41,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 308. [2021-05-22 02:21:41,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 308 states, 307 states have (on average 2.980456026058632) internal successors, (915), 307 states have internal predecessors, (915), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 915 transitions. [2021-05-22 02:21:41,012 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 915 transitions. Word has length 20 [2021-05-22 02:21:41,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:41,012 INFO L482 AbstractCegarLoop]: Abstraction has 308 states and 915 transitions. [2021-05-22 02:21:41,012 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,013 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 915 transitions. [2021-05-22 02:21:41,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:41,013 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:41,013 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:41,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable163,53 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:41,221 INFO L430 AbstractCegarLoop]: === Iteration 65 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:41,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:41,221 INFO L82 PathProgramCache]: Analyzing trace with hash -930692556, now seen corresponding path program 53 times [2021-05-22 02:21:41,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:41,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9521718] [2021-05-22 02:21:41,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:41,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:41,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:41,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:41,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9521718] [2021-05-22 02:21:41,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9521718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:41,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641123621] [2021-05-22 02:21:41,356 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:41,383 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:41,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:41,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:41,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:41,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:41,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:41,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:41,478 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:41,478 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:25 [2021-05-22 02:21:41,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:41,511 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:41,514 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:41,515 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:41,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:41,548 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,549 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:41,550 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:41,553 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:41,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:41,554 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:41,582 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:41,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:41,584 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:79, output treesize:35 [2021-05-22 02:21:41,685 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:41,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641123621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:41,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:41,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:41,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694866799] [2021-05-22 02:21:41,686 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:41,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:41,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:41,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:41,686 INFO L87 Difference]: Start difference. First operand 308 states and 915 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:41,962 INFO L93 Difference]: Finished difference Result 369 states and 1088 transitions. [2021-05-22 02:21:41,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:21:41,962 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:41,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:41,963 INFO L225 Difference]: With dead ends: 369 [2021-05-22 02:21:41,963 INFO L226 Difference]: Without dead ends: 354 [2021-05-22 02:21:41,963 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 286.6ms TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:41,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 354 states. [2021-05-22 02:21:41,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 354 to 305. [2021-05-22 02:21:41,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 2.9835526315789473) internal successors, (907), 304 states have internal predecessors, (907), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 907 transitions. [2021-05-22 02:21:41,969 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 907 transitions. Word has length 20 [2021-05-22 02:21:41,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:41,969 INFO L482 AbstractCegarLoop]: Abstraction has 305 states and 907 transitions. [2021-05-22 02:21:41,969 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:41,969 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 907 transitions. [2021-05-22 02:21:41,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:41,970 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:41,970 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:42,192 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable164,54 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:42,193 INFO L430 AbstractCegarLoop]: === Iteration 66 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:42,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:42,193 INFO L82 PathProgramCache]: Analyzing trace with hash 1645290058, now seen corresponding path program 54 times [2021-05-22 02:21:42,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:42,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1175840940] [2021-05-22 02:21:42,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:42,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:42,332 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:42,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:42,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1175840940] [2021-05-22 02:21:42,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1175840940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:42,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715823133] [2021-05-22 02:21:42,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:42,364 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:42,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:42,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:42,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:42,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:42,417 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:42,426 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:42,427 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:42,427 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:21:42,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:42,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:42,463 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:42,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:42,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:42,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:42,475 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:42,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:42,486 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:42,486 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:21:42,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:42,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715823133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:42,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:42,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:42,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467083147] [2021-05-22 02:21:42,566 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:42,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:42,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:42,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:42,567 INFO L87 Difference]: Start difference. First operand 305 states and 907 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:42,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:42,850 INFO L93 Difference]: Finished difference Result 445 states and 1304 transitions. [2021-05-22 02:21:42,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:42,851 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:42,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:42,851 INFO L225 Difference]: With dead ends: 445 [2021-05-22 02:21:42,851 INFO L226 Difference]: Without dead ends: 430 [2021-05-22 02:21:42,852 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 253.8ms TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:21:42,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-05-22 02:21:42,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 304. [2021-05-22 02:21:42,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 304 states, 303 states have (on average 2.98019801980198) internal successors, (903), 303 states have internal predecessors, (903), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:42,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 903 transitions. [2021-05-22 02:21:42,856 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 903 transitions. Word has length 20 [2021-05-22 02:21:42,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:42,856 INFO L482 AbstractCegarLoop]: Abstraction has 304 states and 903 transitions. [2021-05-22 02:21:42,856 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:42,856 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 903 transitions. [2021-05-22 02:21:42,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:42,856 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:42,856 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:43,057 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable171 [2021-05-22 02:21:43,057 INFO L430 AbstractCegarLoop]: === Iteration 67 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:43,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:43,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1253290060, now seen corresponding path program 55 times [2021-05-22 02:21:43,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:43,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837647766] [2021-05-22 02:21:43,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:43,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:43,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:43,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1837647766] [2021-05-22 02:21:43,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1837647766] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:43,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838370579] [2021-05-22 02:21:43,168 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:43,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:43,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:43,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:43,248 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:43,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:43,249 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,256 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,257 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:43,258 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:21:43,317 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:43,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:43,318 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,326 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,328 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:43,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:43,329 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,336 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,337 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,337 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:12 [2021-05-22 02:21:43,356 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:43,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1838370579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:43,356 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:43,356 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:21:43,356 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980430705] [2021-05-22 02:21:43,356 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:21:43,357 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:43,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:21:43,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:43,357 INFO L87 Difference]: Start difference. First operand 304 states and 903 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:43,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:43,523 INFO L93 Difference]: Finished difference Result 364 states and 1074 transitions. [2021-05-22 02:21:43,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:43,524 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:43,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:43,524 INFO L225 Difference]: With dead ends: 364 [2021-05-22 02:21:43,524 INFO L226 Difference]: Without dead ends: 349 [2021-05-22 02:21:43,525 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 162.0ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:43,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2021-05-22 02:21:43,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 310. [2021-05-22 02:21:43,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 309 states have (on average 2.9902912621359223) internal successors, (924), 309 states have internal predecessors, (924), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:43,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 924 transitions. [2021-05-22 02:21:43,528 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 924 transitions. Word has length 20 [2021-05-22 02:21:43,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:43,528 INFO L482 AbstractCegarLoop]: Abstraction has 310 states and 924 transitions. [2021-05-22 02:21:43,528 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:43,529 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 924 transitions. [2021-05-22 02:21:43,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:43,529 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:43,529 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:43,729 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable172,56 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:43,730 INFO L430 AbstractCegarLoop]: === Iteration 68 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:43,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:43,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1711749074, now seen corresponding path program 56 times [2021-05-22 02:21:43,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:43,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238829186] [2021-05-22 02:21:43,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:43,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:43,864 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:43,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:43,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238829186] [2021-05-22 02:21:43,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1238829186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:43,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442917064] [2021-05-22 02:21:43,865 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:43,902 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:43,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:43,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:43,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:43,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:43,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:43,945 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,951 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,952 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,952 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:21:43,972 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:21:43,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:43,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:43,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:43,989 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:43,996 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:43,997 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:21:44,054 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:44,055 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442917064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:44,055 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:44,055 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:44,055 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859546997] [2021-05-22 02:21:44,055 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:44,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:44,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:44,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:44,055 INFO L87 Difference]: Start difference. First operand 310 states and 924 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:44,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:44,294 INFO L93 Difference]: Finished difference Result 430 states and 1264 transitions. [2021-05-22 02:21:44,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:21:44,294 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:44,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:44,295 INFO L225 Difference]: With dead ends: 430 [2021-05-22 02:21:44,295 INFO L226 Difference]: Without dead ends: 415 [2021-05-22 02:21:44,295 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 234.9ms TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:21:44,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-05-22 02:21:44,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 307. [2021-05-22 02:21:44,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 2.980392156862745) internal successors, (912), 306 states have internal predecessors, (912), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:44,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 912 transitions. [2021-05-22 02:21:44,299 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 912 transitions. Word has length 20 [2021-05-22 02:21:44,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:44,299 INFO L482 AbstractCegarLoop]: Abstraction has 307 states and 912 transitions. [2021-05-22 02:21:44,300 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:44,300 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 912 transitions. [2021-05-22 02:21:44,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:44,300 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:44,300 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:44,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable173,57 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:44,505 INFO L430 AbstractCegarLoop]: === Iteration 69 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:44,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:44,505 INFO L82 PathProgramCache]: Analyzing trace with hash 796667586, now seen corresponding path program 57 times [2021-05-22 02:21:44,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:44,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1183097129] [2021-05-22 02:21:44,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:44,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:44,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:44,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:44,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1183097129] [2021-05-22 02:21:44,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1183097129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:44,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258602910] [2021-05-22 02:21:44,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:44,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:21:44,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:44,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:44,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:44,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:44,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:44,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:44,716 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:21:44,716 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:21:44,739 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:44,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:44,740 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:44,747 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:44,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:21:44,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:21:44,750 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:44,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:44,757 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:44,757 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:21:44,834 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:44,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258602910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:44,834 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:44,834 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:21:44,834 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945350219] [2021-05-22 02:21:44,834 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:21:44,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:44,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:21:44,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:21:44,836 INFO L87 Difference]: Start difference. First operand 307 states and 912 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:45,048 INFO L93 Difference]: Finished difference Result 418 states and 1233 transitions. [2021-05-22 02:21:45,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:21:45,048 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:45,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:45,049 INFO L225 Difference]: With dead ends: 418 [2021-05-22 02:21:45,049 INFO L226 Difference]: Without dead ends: 403 [2021-05-22 02:21:45,049 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 212.5ms TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:21:45,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-22 02:21:45,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 303. [2021-05-22 02:21:45,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 2.980132450331126) internal successors, (900), 302 states have internal predecessors, (900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 900 transitions. [2021-05-22 02:21:45,053 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 900 transitions. Word has length 20 [2021-05-22 02:21:45,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:45,053 INFO L482 AbstractCegarLoop]: Abstraction has 303 states and 900 transitions. [2021-05-22 02:21:45,053 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,053 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 900 transitions. [2021-05-22 02:21:45,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:45,054 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:45,054 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:45,254 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable174,58 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:45,254 INFO L430 AbstractCegarLoop]: === Iteration 70 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:45,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:45,255 INFO L82 PathProgramCache]: Analyzing trace with hash -722189394, now seen corresponding path program 58 times [2021-05-22 02:21:45,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:45,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591643174] [2021-05-22 02:21:45,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:45,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:45,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:45,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:45,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591643174] [2021-05-22 02:21:45,362 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591643174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:45,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508419792] [2021-05-22 02:21:45,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:45,390 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:45,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:45,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:45,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:45,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:45,423 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:45,429 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:45,430 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:45,430 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:45,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:45,494 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:45,498 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:45,498 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:45,498 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:45,498 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:45,528 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:45,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [508419792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:45,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:45,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:45,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844217837] [2021-05-22 02:21:45,529 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:45,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:45,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:45,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:45,529 INFO L87 Difference]: Start difference. First operand 303 states and 900 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:45,830 INFO L93 Difference]: Finished difference Result 473 states and 1398 transitions. [2021-05-22 02:21:45,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:45,830 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:45,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:45,831 INFO L225 Difference]: With dead ends: 473 [2021-05-22 02:21:45,831 INFO L226 Difference]: Without dead ends: 458 [2021-05-22 02:21:45,831 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 253.9ms TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:21:45,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-05-22 02:21:45,835 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 320. [2021-05-22 02:21:45,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 320 states, 319 states have (on average 2.9968652037617556) internal successors, (956), 319 states have internal predecessors, (956), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 320 states to 320 states and 956 transitions. [2021-05-22 02:21:45,836 INFO L78 Accepts]: Start accepts. Automaton has 320 states and 956 transitions. Word has length 20 [2021-05-22 02:21:45,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:45,836 INFO L482 AbstractCegarLoop]: Abstraction has 320 states and 956 transitions. [2021-05-22 02:21:45,836 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:45,836 INFO L276 IsEmpty]: Start isEmpty. Operand 320 states and 956 transitions. [2021-05-22 02:21:45,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:45,836 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:45,836 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:46,037 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable175 [2021-05-22 02:21:46,037 INFO L430 AbstractCegarLoop]: === Iteration 71 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:46,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:46,037 INFO L82 PathProgramCache]: Analyzing trace with hash -1223980730, now seen corresponding path program 59 times [2021-05-22 02:21:46,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:46,037 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146274124] [2021-05-22 02:21:46,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:46,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:46,137 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:46,137 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:46,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146274124] [2021-05-22 02:21:46,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146274124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:46,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2075702294] [2021-05-22 02:21:46,137 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:46,163 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:46,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:46,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:46,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:46,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:46,195 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:46,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:46,198 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:46,215 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:46,216 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:46,216 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:67, output treesize:53 [2021-05-22 02:21:46,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:21:46,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:46,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:46,292 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:46,303 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:46,303 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:46,304 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:46,304 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:33 [2021-05-22 02:21:46,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:46,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2075702294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:46,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:46,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:46,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474627441] [2021-05-22 02:21:46,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:46,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:46,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:46,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:46,394 INFO L87 Difference]: Start difference. First operand 320 states and 956 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:46,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:46,798 INFO L93 Difference]: Finished difference Result 483 states and 1427 transitions. [2021-05-22 02:21:46,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:21:46,800 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:46,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:46,801 INFO L225 Difference]: With dead ends: 483 [2021-05-22 02:21:46,801 INFO L226 Difference]: Without dead ends: 468 [2021-05-22 02:21:46,801 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 401.1ms TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:21:46,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-05-22 02:21:46,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 318. [2021-05-22 02:21:46,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 2.993690851735016) internal successors, (949), 317 states have internal predecessors, (949), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:46,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 949 transitions. [2021-05-22 02:21:46,808 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 949 transitions. Word has length 20 [2021-05-22 02:21:46,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:46,808 INFO L482 AbstractCegarLoop]: Abstraction has 318 states and 949 transitions. [2021-05-22 02:21:46,808 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:46,808 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 949 transitions. [2021-05-22 02:21:46,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:46,809 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:46,809 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:47,032 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable176,60 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:47,032 INFO L430 AbstractCegarLoop]: === Iteration 72 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:47,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:47,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1539141422, now seen corresponding path program 60 times [2021-05-22 02:21:47,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:47,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1292707362] [2021-05-22 02:21:47,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:47,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:47,125 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:47,125 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:47,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1292707362] [2021-05-22 02:21:47,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1292707362] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:47,125 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608360983] [2021-05-22 02:21:47,125 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:47,166 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:47,167 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:47,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:47,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:47,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:47,207 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,212 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:47,213 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,213 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:47,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:47,254 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,258 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:47,258 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:47,259 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,259 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:47,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:47,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608360983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:47,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:47,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:47,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380185735] [2021-05-22 02:21:47,274 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:47,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:47,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:47,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:47,274 INFO L87 Difference]: Start difference. First operand 318 states and 949 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:47,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:47,498 INFO L93 Difference]: Finished difference Result 418 states and 1230 transitions. [2021-05-22 02:21:47,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:47,499 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:47,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:47,500 INFO L225 Difference]: With dead ends: 418 [2021-05-22 02:21:47,500 INFO L226 Difference]: Without dead ends: 403 [2021-05-22 02:21:47,500 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 136.1ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:47,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-22 02:21:47,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 315. [2021-05-22 02:21:47,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 2.9872611464968153) internal successors, (938), 314 states have internal predecessors, (938), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:47,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 938 transitions. [2021-05-22 02:21:47,505 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 938 transitions. Word has length 20 [2021-05-22 02:21:47,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:47,505 INFO L482 AbstractCegarLoop]: Abstraction has 315 states and 938 transitions. [2021-05-22 02:21:47,505 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:47,505 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 938 transitions. [2021-05-22 02:21:47,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:47,506 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:47,506 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:47,728 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable188 [2021-05-22 02:21:47,729 INFO L430 AbstractCegarLoop]: === Iteration 73 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:47,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:47,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1251523996, now seen corresponding path program 61 times [2021-05-22 02:21:47,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:47,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4601871] [2021-05-22 02:21:47,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:47,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:47,814 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:47,814 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:47,814 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4601871] [2021-05-22 02:21:47,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4601871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:47,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236723337] [2021-05-22 02:21:47,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:47,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:47,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:47,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:47,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:47,893 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,899 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:47,900 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,900 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:47,923 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:47,925 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,931 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:47,931 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:47,931 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:47,932 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:21:47,952 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:47,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236723337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:47,953 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:47,953 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:21:47,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061117153] [2021-05-22 02:21:47,953 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:21:47,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:47,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:21:47,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:47,953 INFO L87 Difference]: Start difference. First operand 315 states and 938 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:48,137 INFO L93 Difference]: Finished difference Result 428 states and 1259 transitions. [2021-05-22 02:21:48,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:48,138 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:48,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:48,138 INFO L225 Difference]: With dead ends: 428 [2021-05-22 02:21:48,139 INFO L226 Difference]: Without dead ends: 413 [2021-05-22 02:21:48,139 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 122.0ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:48,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-05-22 02:21:48,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 314. [2021-05-22 02:21:48,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 314 states, 313 states have (on average 2.9808306709265175) internal successors, (933), 313 states have internal predecessors, (933), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 933 transitions. [2021-05-22 02:21:48,143 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 933 transitions. Word has length 20 [2021-05-22 02:21:48,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:48,143 INFO L482 AbstractCegarLoop]: Abstraction has 314 states and 933 transitions. [2021-05-22 02:21:48,143 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,143 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 933 transitions. [2021-05-22 02:21:48,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:48,144 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:48,144 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:48,352 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable189 [2021-05-22 02:21:48,352 INFO L430 AbstractCegarLoop]: === Iteration 74 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:48,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:48,352 INFO L82 PathProgramCache]: Analyzing trace with hash -2137563706, now seen corresponding path program 62 times [2021-05-22 02:21:48,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:48,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33383769] [2021-05-22 02:21:48,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:48,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:48,453 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:48,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:48,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33383769] [2021-05-22 02:21:48,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33383769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:48,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844153010] [2021-05-22 02:21:48,454 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:48,485 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:48,485 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:48,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:48,486 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:48,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:48,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:48,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:48,558 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:48,559 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:48,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:48,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:48,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:48,583 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:48,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:48,583 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:21:48,598 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:48,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844153010] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:48,599 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:48,599 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:48,599 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565238550] [2021-05-22 02:21:48,599 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:48,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:48,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:48,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:48,599 INFO L87 Difference]: Start difference. First operand 314 states and 933 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:48,740 INFO L93 Difference]: Finished difference Result 407 states and 1202 transitions. [2021-05-22 02:21:48,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:48,740 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:48,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:48,742 INFO L225 Difference]: With dead ends: 407 [2021-05-22 02:21:48,742 INFO L226 Difference]: Without dead ends: 392 [2021-05-22 02:21:48,742 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 141.0ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:48,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-22 02:21:48,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 311. [2021-05-22 02:21:48,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 2.9838709677419355) internal successors, (925), 310 states have internal predecessors, (925), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 925 transitions. [2021-05-22 02:21:48,747 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 925 transitions. Word has length 20 [2021-05-22 02:21:48,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:48,747 INFO L482 AbstractCegarLoop]: Abstraction has 311 states and 925 transitions. [2021-05-22 02:21:48,748 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:48,748 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 925 transitions. [2021-05-22 02:21:48,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:48,748 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:48,748 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:48,949 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 63 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable190 [2021-05-22 02:21:48,949 INFO L430 AbstractCegarLoop]: === Iteration 75 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:48,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:48,949 INFO L82 PathProgramCache]: Analyzing trace with hash 438418908, now seen corresponding path program 63 times [2021-05-22 02:21:48,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:48,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620670109] [2021-05-22 02:21:48,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:48,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:49,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:49,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:49,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620670109] [2021-05-22 02:21:49,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620670109] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:49,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [925329369] [2021-05-22 02:21:49,052 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:49,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:21:49,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:49,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:49,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:49,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:49,118 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,122 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:49,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,123 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:21:49,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:49,140 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:49,145 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:49,145 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,145 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:21:49,162 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:49,163 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [925329369] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:49,163 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:49,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:21:49,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955546746] [2021-05-22 02:21:49,163 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:21:49,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:49,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:21:49,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:49,163 INFO L87 Difference]: Start difference. First operand 311 states and 925 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:49,298 INFO L93 Difference]: Finished difference Result 433 states and 1270 transitions. [2021-05-22 02:21:49,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:49,298 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:49,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:49,299 INFO L225 Difference]: With dead ends: 433 [2021-05-22 02:21:49,299 INFO L226 Difference]: Without dead ends: 418 [2021-05-22 02:21:49,299 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 109.9ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:21:49,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 418 states. [2021-05-22 02:21:49,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 418 to 310. [2021-05-22 02:21:49,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 310 states, 309 states have (on average 2.9805825242718447) internal successors, (921), 309 states have internal predecessors, (921), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 921 transitions. [2021-05-22 02:21:49,303 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 921 transitions. Word has length 20 [2021-05-22 02:21:49,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:49,303 INFO L482 AbstractCegarLoop]: Abstraction has 310 states and 921 transitions. [2021-05-22 02:21:49,303 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,303 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 921 transitions. [2021-05-22 02:21:49,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:49,304 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:49,304 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:49,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable191,64 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:49,504 INFO L430 AbstractCegarLoop]: === Iteration 76 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:49,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:49,505 INFO L82 PathProgramCache]: Analyzing trace with hash -460350802, now seen corresponding path program 64 times [2021-05-22 02:21:49,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:49,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [857611944] [2021-05-22 02:21:49,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:49,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:49,575 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:49,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:49,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [857611944] [2021-05-22 02:21:49,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [857611944] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:49,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053957683] [2021-05-22 02:21:49,575 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:49,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:49,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:49,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:49,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:49,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:49,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:49,626 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,626 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:21:49,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:49,637 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:49,641 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:49,641 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:49,641 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:21:49,654 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:49,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053957683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:49,654 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:49,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:21:49,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857361966] [2021-05-22 02:21:49,654 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:21:49,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:49,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:21:49,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:21:49,655 INFO L87 Difference]: Start difference. First operand 310 states and 921 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:49,784 INFO L93 Difference]: Finished difference Result 511 states and 1507 transitions. [2021-05-22 02:21:49,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:49,784 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:49,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:49,785 INFO L225 Difference]: With dead ends: 511 [2021-05-22 02:21:49,785 INFO L226 Difference]: Without dead ends: 496 [2021-05-22 02:21:49,785 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 72.3ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:21:49,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2021-05-22 02:21:49,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 305. [2021-05-22 02:21:49,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 2.986842105263158) internal successors, (908), 304 states have internal predecessors, (908), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 908 transitions. [2021-05-22 02:21:49,792 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 908 transitions. Word has length 20 [2021-05-22 02:21:49,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:49,792 INFO L482 AbstractCegarLoop]: Abstraction has 305 states and 908 transitions. [2021-05-22 02:21:49,792 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:49,792 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 908 transitions. [2021-05-22 02:21:49,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:49,793 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:49,793 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:50,008 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable192,65 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:50,008 INFO L430 AbstractCegarLoop]: === Iteration 77 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:50,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:50,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1074885762, now seen corresponding path program 65 times [2021-05-22 02:21:50,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:50,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1963822090] [2021-05-22 02:21:50,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:50,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:50,104 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:50,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:50,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1963822090] [2021-05-22 02:21:50,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1963822090] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:50,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945931254] [2021-05-22 02:21:50,105 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:50,143 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:21:50,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:50,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:21:50,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:50,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:50,163 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:50,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:50,168 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:50,168 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:50,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:50,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:50,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:50,194 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:50,213 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:50,213 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:50,214 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:21:50,214 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:69, output treesize:41 [2021-05-22 02:21:50,339 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:50,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945931254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:50,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:50,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:21:50,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198274651] [2021-05-22 02:21:50,340 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:21:50,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:50,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:21:50,340 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:50,341 INFO L87 Difference]: Start difference. First operand 305 states and 908 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:50,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:50,852 INFO L93 Difference]: Finished difference Result 621 states and 1830 transitions. [2021-05-22 02:21:50,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:21:50,852 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:50,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:50,853 INFO L225 Difference]: With dead ends: 621 [2021-05-22 02:21:50,853 INFO L226 Difference]: Without dead ends: 606 [2021-05-22 02:21:50,853 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 376.7ms TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:21:50,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2021-05-22 02:21:50,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 303. [2021-05-22 02:21:50,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 2.980132450331126) internal successors, (900), 302 states have internal predecessors, (900), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:50,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 900 transitions. [2021-05-22 02:21:50,858 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 900 transitions. Word has length 20 [2021-05-22 02:21:50,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:50,858 INFO L482 AbstractCegarLoop]: Abstraction has 303 states and 900 transitions. [2021-05-22 02:21:50,858 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:50,858 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 900 transitions. [2021-05-22 02:21:50,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:50,859 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:50,859 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:51,059 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable193 [2021-05-22 02:21:51,059 INFO L430 AbstractCegarLoop]: === Iteration 78 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:51,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:51,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1297313230, now seen corresponding path program 66 times [2021-05-22 02:21:51,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:51,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2108842827] [2021-05-22 02:21:51,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:51,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:51,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:51,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2108842827] [2021-05-22 02:21:51,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2108842827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:51,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1212512117] [2021-05-22 02:21:51,155 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:51,181 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:21:51,181 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:51,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:51,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:51,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:51,218 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:51,223 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,223 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:51,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:51,257 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,260 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:51,260 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:21:51,261 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,261 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:51,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:51,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1212512117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:51,274 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:51,274 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:21:51,274 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74431909] [2021-05-22 02:21:51,274 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:21:51,274 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:51,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:21:51,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:21:51,275 INFO L87 Difference]: Start difference. First operand 303 states and 900 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:51,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:51,412 INFO L93 Difference]: Finished difference Result 381 states and 1125 transitions. [2021-05-22 02:21:51,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:21:51,413 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:51,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:51,413 INFO L225 Difference]: With dead ends: 381 [2021-05-22 02:21:51,413 INFO L226 Difference]: Without dead ends: 366 [2021-05-22 02:21:51,413 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 131.1ms TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:21:51,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 366 states. [2021-05-22 02:21:51,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 366 to 315. [2021-05-22 02:21:51,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 2.9904458598726116) internal successors, (939), 314 states have internal predecessors, (939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:51,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 939 transitions. [2021-05-22 02:21:51,417 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 939 transitions. Word has length 20 [2021-05-22 02:21:51,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:51,417 INFO L482 AbstractCegarLoop]: Abstraction has 315 states and 939 transitions. [2021-05-22 02:21:51,417 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:51,417 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 939 transitions. [2021-05-22 02:21:51,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:51,418 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:51,418 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:51,618 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable198,67 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:51,618 INFO L430 AbstractCegarLoop]: === Iteration 79 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:51,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:51,619 INFO L82 PathProgramCache]: Analyzing trace with hash -32614932, now seen corresponding path program 67 times [2021-05-22 02:21:51,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:51,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583219677] [2021-05-22 02:21:51,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:51,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:51,737 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:51,737 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:51,737 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583219677] [2021-05-22 02:21:51,737 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583219677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:51,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [294155645] [2021-05-22 02:21:51,738 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:51,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:51,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:51,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:51,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:51,811 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,817 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:51,818 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,818 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:21:51,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:51,842 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:51,848 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:21:51,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:51,849 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:21:51,926 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:51,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [294155645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:51,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:51,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:51,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596424462] [2021-05-22 02:21:51,927 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:51,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:51,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:51,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:51,927 INFO L87 Difference]: Start difference. First operand 315 states and 939 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:52,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:52,223 INFO L93 Difference]: Finished difference Result 461 states and 1356 transitions. [2021-05-22 02:21:52,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:21:52,224 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:52,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:52,225 INFO L225 Difference]: With dead ends: 461 [2021-05-22 02:21:52,225 INFO L226 Difference]: Without dead ends: 446 [2021-05-22 02:21:52,225 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 276.5ms TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:52,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-05-22 02:21:52,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 312. [2021-05-22 02:21:52,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 2.9807073954983925) internal successors, (927), 311 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:52,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 927 transitions. [2021-05-22 02:21:52,231 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 927 transitions. Word has length 20 [2021-05-22 02:21:52,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:52,231 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 927 transitions. [2021-05-22 02:21:52,231 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:52,231 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 927 transitions. [2021-05-22 02:21:52,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:52,232 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:52,232 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:52,445 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable199,68 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:52,445 INFO L430 AbstractCegarLoop]: === Iteration 80 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:52,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:52,446 INFO L82 PathProgramCache]: Analyzing trace with hash -947696420, now seen corresponding path program 68 times [2021-05-22 02:21:52,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:52,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1173887503] [2021-05-22 02:21:52,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:52,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:52,558 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:52,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:52,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1173887503] [2021-05-22 02:21:52,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1173887503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:52,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1914670605] [2021-05-22 02:21:52,558 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:52,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:52,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:52,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:52,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:52,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:52,626 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:52,632 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:52,633 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:52,633 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:21:52,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:52,655 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:52,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:52,660 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:52,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:52,661 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:21:52,733 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:52,734 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1914670605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:52,734 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:52,734 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:21:52,734 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255467889] [2021-05-22 02:21:52,734 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:21:52,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:52,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:21:52,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:21:52,735 INFO L87 Difference]: Start difference. First operand 312 states and 927 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:53,007 INFO L93 Difference]: Finished difference Result 436 states and 1287 transitions. [2021-05-22 02:21:53,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:21:53,007 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:53,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:53,008 INFO L225 Difference]: With dead ends: 436 [2021-05-22 02:21:53,008 INFO L226 Difference]: Without dead ends: 421 [2021-05-22 02:21:53,009 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 245.1ms TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:21:53,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-05-22 02:21:53,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 309. [2021-05-22 02:21:53,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 2.9805194805194803) internal successors, (918), 308 states have internal predecessors, (918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 918 transitions. [2021-05-22 02:21:53,014 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 918 transitions. Word has length 20 [2021-05-22 02:21:53,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:53,014 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 918 transitions. [2021-05-22 02:21:53,015 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,015 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 918 transitions. [2021-05-22 02:21:53,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:53,015 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:53,015 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:53,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable200 [2021-05-22 02:21:53,216 INFO L430 AbstractCegarLoop]: === Iteration 81 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:53,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:53,216 INFO L82 PathProgramCache]: Analyzing trace with hash 537392906, now seen corresponding path program 69 times [2021-05-22 02:21:53,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:53,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146402679] [2021-05-22 02:21:53,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:53,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:53,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:53,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146402679] [2021-05-22 02:21:53,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146402679] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:53,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [813206760] [2021-05-22 02:21:53,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:53,356 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:21:53,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:53,357 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:53,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:53,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:53,376 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:53,379 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:53,380 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:53,380 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:21:53,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:21:53,397 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:53,402 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:53,402 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:53,402 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:53,402 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:21:53,455 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:53,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [813206760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:53,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:53,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:21:53,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337429957] [2021-05-22 02:21:53,456 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:21:53,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:53,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:21:53,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:21:53,456 INFO L87 Difference]: Start difference. First operand 309 states and 918 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:53,710 INFO L93 Difference]: Finished difference Result 544 states and 1604 transitions. [2021-05-22 02:21:53,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:21:53,710 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:53,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:53,712 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:21:53,712 INFO L226 Difference]: Without dead ends: 529 [2021-05-22 02:21:53,713 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 222.2ms TimeCoverageRelationStatistics Valid=97, Invalid=323, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:21:53,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-22 02:21:53,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 309. [2021-05-22 02:21:53,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 2.9805194805194803) internal successors, (918), 308 states have internal predecessors, (918), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 918 transitions. [2021-05-22 02:21:53,719 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 918 transitions. Word has length 20 [2021-05-22 02:21:53,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:53,719 INFO L482 AbstractCegarLoop]: Abstraction has 309 states and 918 transitions. [2021-05-22 02:21:53,719 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:53,719 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 918 transitions. [2021-05-22 02:21:53,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:53,720 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:53,720 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:53,944 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable201 [2021-05-22 02:21:53,944 INFO L430 AbstractCegarLoop]: === Iteration 82 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:53,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:53,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1424757384, now seen corresponding path program 70 times [2021-05-22 02:21:53,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:53,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143900168] [2021-05-22 02:21:53,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:53,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:54,017 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:54,018 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:54,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143900168] [2021-05-22 02:21:54,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143900168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:54,018 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287983596] [2021-05-22 02:21:54,018 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:54,044 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:54,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:54,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:54,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:54,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:54,087 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:54,090 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:54,091 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:54,091 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:21:54,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:54,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:54,133 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:54,133 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:54,133 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:54,133 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:54,160 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:54,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287983596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:54,160 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:54,160 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:54,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1913852106] [2021-05-22 02:21:54,161 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:54,161 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:54,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:54,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:54,161 INFO L87 Difference]: Start difference. First operand 309 states and 918 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:54,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:54,681 INFO L93 Difference]: Finished difference Result 690 states and 2025 transitions. [2021-05-22 02:21:54,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:21:54,682 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:54,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:54,683 INFO L225 Difference]: With dead ends: 690 [2021-05-22 02:21:54,683 INFO L226 Difference]: Without dead ends: 675 [2021-05-22 02:21:54,683 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 397.8ms TimeCoverageRelationStatistics Valid=188, Invalid=804, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:21:54,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-05-22 02:21:54,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 315. [2021-05-22 02:21:54,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 2.9808917197452227) internal successors, (936), 314 states have internal predecessors, (936), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:54,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 936 transitions. [2021-05-22 02:21:54,688 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 936 transitions. Word has length 20 [2021-05-22 02:21:54,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:54,689 INFO L482 AbstractCegarLoop]: Abstraction has 315 states and 936 transitions. [2021-05-22 02:21:54,689 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:54,689 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 936 transitions. [2021-05-22 02:21:54,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:54,689 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:54,689 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:54,889 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 71 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable202 [2021-05-22 02:21:54,890 INFO L430 AbstractCegarLoop]: === Iteration 83 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:54,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:54,890 INFO L82 PathProgramCache]: Analyzing trace with hash -517942808, now seen corresponding path program 71 times [2021-05-22 02:21:54,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:54,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881707511] [2021-05-22 02:21:54,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:54,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:54,972 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:54,972 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:54,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881707511] [2021-05-22 02:21:54,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881707511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:54,972 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1128560355] [2021-05-22 02:21:54,972 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:54,999 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:54,999 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:55,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:55,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:55,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:55,054 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,057 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:55,058 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,058 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:55,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:55,090 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,092 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:55,092 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:55,093 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,093 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:55,119 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:55,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1128560355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:55,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:55,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:55,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086057869] [2021-05-22 02:21:55,120 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:55,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:55,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:55,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:55,120 INFO L87 Difference]: Start difference. First operand 315 states and 936 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:55,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:55,484 INFO L93 Difference]: Finished difference Result 576 states and 1695 transitions. [2021-05-22 02:21:55,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:55,485 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:55,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:55,486 INFO L225 Difference]: With dead ends: 576 [2021-05-22 02:21:55,486 INFO L226 Difference]: Without dead ends: 561 [2021-05-22 02:21:55,486 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 179 ImplicationChecksByTransitivity, 298.3ms TimeCoverageRelationStatistics Valid=147, Invalid=665, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:55,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-05-22 02:21:55,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 321. [2021-05-22 02:21:55,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 2.990625) internal successors, (957), 320 states have internal predecessors, (957), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:55,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 957 transitions. [2021-05-22 02:21:55,492 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 957 transitions. Word has length 20 [2021-05-22 02:21:55,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:55,492 INFO L482 AbstractCegarLoop]: Abstraction has 321 states and 957 transitions. [2021-05-22 02:21:55,492 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:55,492 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 957 transitions. [2021-05-22 02:21:55,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:55,493 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:55,493 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:55,693 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable203,72 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:55,693 INFO L430 AbstractCegarLoop]: === Iteration 84 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:55,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:55,693 INFO L82 PathProgramCache]: Analyzing trace with hash -1019734144, now seen corresponding path program 72 times [2021-05-22 02:21:55,694 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:55,694 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898927016] [2021-05-22 02:21:55,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:55,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:55,787 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:55,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:55,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898927016] [2021-05-22 02:21:55,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898927016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:55,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296232189] [2021-05-22 02:21:55,787 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 73 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:55,831 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:21:55,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:55,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:55,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:55,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:55,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,888 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:55,888 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,888 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:55,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:55,908 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,912 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:55,912 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:55,912 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:55,912 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:55,954 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:55,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296232189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:55,955 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:55,955 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:55,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456181102] [2021-05-22 02:21:55,955 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:55,955 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:55,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:55,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:55,955 INFO L87 Difference]: Start difference. First operand 321 states and 957 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:56,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:56,349 INFO L93 Difference]: Finished difference Result 570 states and 1672 transitions. [2021-05-22 02:21:56,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:56,349 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:56,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:56,351 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:21:56,351 INFO L226 Difference]: Without dead ends: 555 [2021-05-22 02:21:56,351 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 311.5ms TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:56,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-22 02:21:56,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 318. [2021-05-22 02:21:56,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 318 states, 317 states have (on average 2.9810725552050474) internal successors, (945), 317 states have internal predecessors, (945), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:56,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 945 transitions. [2021-05-22 02:21:56,358 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 945 transitions. Word has length 20 [2021-05-22 02:21:56,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:56,358 INFO L482 AbstractCegarLoop]: Abstraction has 318 states and 945 transitions. [2021-05-22 02:21:56,358 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:56,358 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 945 transitions. [2021-05-22 02:21:56,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:56,359 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:56,359 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:56,572 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable204 [2021-05-22 02:21:56,573 INFO L430 AbstractCegarLoop]: === Iteration 85 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:56,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:56,573 INFO L82 PathProgramCache]: Analyzing trace with hash 1168449032, now seen corresponding path program 73 times [2021-05-22 02:21:56,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:56,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865742176] [2021-05-22 02:21:56,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:56,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:56,666 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:56,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:56,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865742176] [2021-05-22 02:21:56,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865742176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:56,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016812430] [2021-05-22 02:21:56,666 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:56,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:56,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:56,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:56,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:56,747 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:56,750 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:56,751 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:56,751 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:56,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:56,767 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:56,770 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:56,770 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:21:56,771 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:56,771 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:56,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:56,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016812430] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:56,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:56,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:56,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229624495] [2021-05-22 02:21:56,816 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:56,816 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:56,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:56,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:56,816 INFO L87 Difference]: Start difference. First operand 318 states and 945 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:57,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:57,182 INFO L93 Difference]: Finished difference Result 550 states and 1618 transitions. [2021-05-22 02:21:57,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:57,183 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:57,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:57,185 INFO L225 Difference]: With dead ends: 550 [2021-05-22 02:21:57,185 INFO L226 Difference]: Without dead ends: 535 [2021-05-22 02:21:57,185 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 298.4ms TimeCoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:57,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-22 02:21:57,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 312. [2021-05-22 02:21:57,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 312 states, 311 states have (on average 2.9807073954983925) internal successors, (927), 311 states have internal predecessors, (927), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:57,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 312 states to 312 states and 927 transitions. [2021-05-22 02:21:57,192 INFO L78 Accepts]: Start accepts. Automaton has 312 states and 927 transitions. Word has length 20 [2021-05-22 02:21:57,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:57,192 INFO L482 AbstractCegarLoop]: Abstraction has 312 states and 927 transitions. [2021-05-22 02:21:57,192 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:57,192 INFO L276 IsEmpty]: Start isEmpty. Operand 312 states and 927 transitions. [2021-05-22 02:21:57,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:57,193 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:57,193 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:57,415 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable205,74 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:57,415 INFO L430 AbstractCegarLoop]: === Iteration 86 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:57,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:57,416 INFO L82 PathProgramCache]: Analyzing trace with hash 2087081584, now seen corresponding path program 74 times [2021-05-22 02:21:57,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:57,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075018703] [2021-05-22 02:21:57,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:57,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:57,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:57,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:57,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075018703] [2021-05-22 02:21:57,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075018703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:57,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627359450] [2021-05-22 02:21:57,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 75 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:57,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:21:57,540 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:57,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:57,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:57,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:57,611 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:57,615 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:57,616 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:57,616 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:57,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:57,658 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:57,661 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:57,661 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:57,662 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:57,662 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:21:57,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:57,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627359450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:57,698 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:57,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:57,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883124260] [2021-05-22 02:21:57,698 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:57,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:57,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:57,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:57,699 INFO L87 Difference]: Start difference. First operand 312 states and 927 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:58,138 INFO L93 Difference]: Finished difference Result 578 states and 1702 transitions. [2021-05-22 02:21:58,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:58,138 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:58,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:58,139 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:21:58,139 INFO L226 Difference]: Without dead ends: 563 [2021-05-22 02:21:58,140 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 357.8ms TimeCoverageRelationStatistics Valid=150, Invalid=662, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:58,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-05-22 02:21:58,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 322. [2021-05-22 02:21:58,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 322 states, 321 states have (on average 2.9906542056074765) internal successors, (960), 321 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 960 transitions. [2021-05-22 02:21:58,145 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 960 transitions. Word has length 20 [2021-05-22 02:21:58,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:58,145 INFO L482 AbstractCegarLoop]: Abstraction has 322 states and 960 transitions. [2021-05-22 02:21:58,145 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,145 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 960 transitions. [2021-05-22 02:21:58,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:58,146 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:58,146 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:58,346 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable206 [2021-05-22 02:21:58,347 INFO L430 AbstractCegarLoop]: === Iteration 87 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:58,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:58,347 INFO L82 PathProgramCache]: Analyzing trace with hash 1585290248, now seen corresponding path program 75 times [2021-05-22 02:21:58,347 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:58,347 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477346072] [2021-05-22 02:21:58,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:58,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:58,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:58,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:58,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477346072] [2021-05-22 02:21:58,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1477346072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:58,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1184037119] [2021-05-22 02:21:58,439 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:58,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:21:58,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:58,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:58,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:58,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:58,539 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:58,542 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:58,543 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:58,543 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:58,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:58,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:58,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:58,562 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:21:58,562 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:58,562 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:58,603 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:58,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1184037119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:58,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:58,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:58,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561540580] [2021-05-22 02:21:58,603 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:58,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:58,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:58,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:58,604 INFO L87 Difference]: Start difference. First operand 322 states and 960 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:58,943 INFO L93 Difference]: Finished difference Result 594 states and 1744 transitions. [2021-05-22 02:21:58,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:58,944 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:58,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:58,945 INFO L225 Difference]: With dead ends: 594 [2021-05-22 02:21:58,945 INFO L226 Difference]: Without dead ends: 579 [2021-05-22 02:21:58,945 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 304.1ms TimeCoverageRelationStatistics Valid=153, Invalid=659, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:58,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-05-22 02:21:58,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 319. [2021-05-22 02:21:58,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 2.981132075471698) internal successors, (948), 318 states have internal predecessors, (948), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 948 transitions. [2021-05-22 02:21:58,949 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 948 transitions. Word has length 20 [2021-05-22 02:21:58,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:58,949 INFO L482 AbstractCegarLoop]: Abstraction has 319 states and 948 transitions. [2021-05-22 02:21:58,949 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:58,950 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 948 transitions. [2021-05-22 02:21:58,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:58,950 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:58,950 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:59,150 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable207,76 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:59,151 INFO L430 AbstractCegarLoop]: === Iteration 88 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:59,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:59,151 INFO L82 PathProgramCache]: Analyzing trace with hash -521493872, now seen corresponding path program 76 times [2021-05-22 02:21:59,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:59,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [167728703] [2021-05-22 02:21:59,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:59,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:21:59,238 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:59,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:21:59,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [167728703] [2021-05-22 02:21:59,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [167728703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:59,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41491503] [2021-05-22 02:21:59,238 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 77 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:59,264 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:21:59,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:21:59,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:21:59,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:21:59,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:21:59,338 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:59,343 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:59,344 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:59,344 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:21:59,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:21:59,365 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:21:59,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:21:59,369 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:21:59,369 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:21:59,369 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:21:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:21:59,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41491503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:21:59,411 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:21:59,411 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:21:59,411 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [831315793] [2021-05-22 02:21:59,411 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:21:59,411 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:21:59,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:21:59,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:21:59,412 INFO L87 Difference]: Start difference. First operand 319 states and 948 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:59,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:21:59,757 INFO L93 Difference]: Finished difference Result 574 states and 1690 transitions. [2021-05-22 02:21:59,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:21:59,757 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:21:59,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:21:59,758 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:21:59,758 INFO L226 Difference]: Without dead ends: 559 [2021-05-22 02:21:59,758 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 311.7ms TimeCoverageRelationStatistics Valid=148, Invalid=664, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:21:59,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2021-05-22 02:21:59,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 316. [2021-05-22 02:21:59,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 315 states have (on average 2.980952380952381) internal successors, (939), 315 states have internal predecessors, (939), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:59,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 939 transitions. [2021-05-22 02:21:59,765 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 939 transitions. Word has length 20 [2021-05-22 02:21:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:21:59,765 INFO L482 AbstractCegarLoop]: Abstraction has 316 states and 939 transitions. [2021-05-22 02:21:59,765 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:21:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 939 transitions. [2021-05-22 02:21:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:21:59,766 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:21:59,766 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:21:59,983 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable208,77 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:21:59,983 INFO L430 AbstractCegarLoop]: === Iteration 89 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:21:59,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:21:59,983 INFO L82 PathProgramCache]: Analyzing trace with hash 518741926, now seen corresponding path program 77 times [2021-05-22 02:21:59,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:21:59,983 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788556281] [2021-05-22 02:21:59,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:21:59,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:00,079 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:00,080 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:00,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788556281] [2021-05-22 02:22:00,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788556281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:00,080 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880991231] [2021-05-22 02:22:00,080 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:00,113 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:00,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:00,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:00,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:00,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:00,168 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:00,172 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:00,172 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:00,173 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:22:00,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:00,211 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:00,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:00,216 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:00,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:00,217 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:00,275 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:00,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880991231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:00,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:00,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:22:00,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638306837] [2021-05-22 02:22:00,276 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:22:00,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:00,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:22:00,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:00,276 INFO L87 Difference]: Start difference. First operand 316 states and 939 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:00,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:00,729 INFO L93 Difference]: Finished difference Result 695 states and 2045 transitions. [2021-05-22 02:22:00,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:22:00,729 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:00,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:00,731 INFO L225 Difference]: With dead ends: 695 [2021-05-22 02:22:00,731 INFO L226 Difference]: Without dead ends: 680 [2021-05-22 02:22:00,731 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 366.5ms TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:22:00,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-05-22 02:22:00,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 325. [2021-05-22 02:22:00,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:00,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:22:00,738 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:22:00,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:00,738 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:22:00,738 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:00,738 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:22:00,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:00,739 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:00,739 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:00,939 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable209 [2021-05-22 02:22:00,940 INFO L430 AbstractCegarLoop]: === Iteration 90 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:00,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:00,940 INFO L82 PathProgramCache]: Analyzing trace with hash 409447658, now seen corresponding path program 78 times [2021-05-22 02:22:00,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:00,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550404042] [2021-05-22 02:22:00,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:01,044 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:01,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:01,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550404042] [2021-05-22 02:22:01,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550404042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:01,045 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592388421] [2021-05-22 02:22:01,045 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 79 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:01,078 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:01,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:01,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:01,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:01,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:01,100 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:01,105 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,105 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:22:01,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:01,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:01,164 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:01,165 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,165 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:22:01,188 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:01,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592388421] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:01,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:01,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:01,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166418615] [2021-05-22 02:22:01,189 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:01,189 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:01,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:01,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:01,189 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:01,446 INFO L93 Difference]: Finished difference Result 580 states and 1705 transitions. [2021-05-22 02:22:01,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:01,447 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:01,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:01,447 INFO L225 Difference]: With dead ends: 580 [2021-05-22 02:22:01,447 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:22:01,448 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 227.5ms TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:22:01,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:22:01,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 329. [2021-05-22 02:22:01,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:22:01,452 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:22:01,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:01,452 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:22:01,453 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,453 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:22:01,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:01,453 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:01,453 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:01,653 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 79 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable210 [2021-05-22 02:22:01,654 INFO L430 AbstractCegarLoop]: === Iteration 91 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:01,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:01,654 INFO L82 PathProgramCache]: Analyzing trace with hash -1272688656, now seen corresponding path program 79 times [2021-05-22 02:22:01,654 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:01,654 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024656226] [2021-05-22 02:22:01,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:01,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:01,746 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:01,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024656226] [2021-05-22 02:22:01,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1024656226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:01,747 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2080634877] [2021-05-22 02:22:01,747 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:01,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:01,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:01,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:01,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:01,801 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:01,805 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,805 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:22:01,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:01,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,821 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:01,821 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:01,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:01,821 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:22:01,829 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:01,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2080634877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:01,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:01,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:22:01,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058352278] [2021-05-22 02:22:01,829 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:22:01,830 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:01,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:22:01,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:22:01,830 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:01,949 INFO L93 Difference]: Finished difference Result 413 states and 1218 transitions. [2021-05-22 02:22:01,949 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:01,950 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:01,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:01,950 INFO L225 Difference]: With dead ends: 413 [2021-05-22 02:22:01,950 INFO L226 Difference]: Without dead ends: 398 [2021-05-22 02:22:01,950 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 103.4ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:22:01,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-05-22 02:22:01,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 336. [2021-05-22 02:22:01,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.988059701492537) internal successors, (1001), 335 states have internal predecessors, (1001), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1001 transitions. [2021-05-22 02:22:01,954 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1001 transitions. Word has length 20 [2021-05-22 02:22:01,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:01,954 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1001 transitions. [2021-05-22 02:22:01,954 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:01,954 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1001 transitions. [2021-05-22 02:22:01,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:01,955 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:01,955 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:02,163 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable211,80 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:02,164 INFO L430 AbstractCegarLoop]: === Iteration 92 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:02,164 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:02,164 INFO L82 PathProgramCache]: Analyzing trace with hash -1538106478, now seen corresponding path program 80 times [2021-05-22 02:22:02,164 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:02,164 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772457122] [2021-05-22 02:22:02,164 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:02,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:02,241 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:02,241 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:02,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772457122] [2021-05-22 02:22:02,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772457122] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:02,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131760441] [2021-05-22 02:22:02,242 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 81 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:02,267 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:02,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:02,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:02,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:02,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:02,296 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,300 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:02,301 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,301 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:22:02,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:02,310 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:02,313 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:02,313 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,314 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:02,325 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:02,326 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131760441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:02,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:02,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:22:02,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44116735] [2021-05-22 02:22:02,326 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:22:02,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:02,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:22:02,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:22:02,326 INFO L87 Difference]: Start difference. First operand 336 states and 1001 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:02,430 INFO L93 Difference]: Finished difference Result 419 states and 1231 transitions. [2021-05-22 02:22:02,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:02,430 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:02,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:02,431 INFO L225 Difference]: With dead ends: 419 [2021-05-22 02:22:02,431 INFO L226 Difference]: Without dead ends: 404 [2021-05-22 02:22:02,431 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 91.4ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:22:02,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-22 02:22:02,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 333. [2021-05-22 02:22:02,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9819277108433737) internal successors, (990), 332 states have internal predecessors, (990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 990 transitions. [2021-05-22 02:22:02,435 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 990 transitions. Word has length 20 [2021-05-22 02:22:02,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:02,436 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 990 transitions. [2021-05-22 02:22:02,436 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,436 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 990 transitions. [2021-05-22 02:22:02,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:02,436 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:02,436 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:02,647 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable212 [2021-05-22 02:22:02,647 INFO L430 AbstractCegarLoop]: === Iteration 93 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:02,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:02,648 INFO L82 PathProgramCache]: Analyzing trace with hash 608064282, now seen corresponding path program 81 times [2021-05-22 02:22:02,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:02,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428427241] [2021-05-22 02:22:02,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:02,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:02,722 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:02,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:02,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428427241] [2021-05-22 02:22:02,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428427241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:02,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1811775645] [2021-05-22 02:22:02,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:02,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:02,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:02,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:02,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:02,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:02,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,782 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:02,783 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,783 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:19 [2021-05-22 02:22:02,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:02,798 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,802 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:02,802 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:02,802 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:02,802 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:22:02,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:02,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1811775645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:02,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:02,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:22:02,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702341934] [2021-05-22 02:22:02,815 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:22:02,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:02,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:22:02,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:22:02,815 INFO L87 Difference]: Start difference. First operand 333 states and 990 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:02,936 INFO L93 Difference]: Finished difference Result 414 states and 1220 transitions. [2021-05-22 02:22:02,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:02,937 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:02,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:02,937 INFO L225 Difference]: With dead ends: 414 [2021-05-22 02:22:02,937 INFO L226 Difference]: Without dead ends: 399 [2021-05-22 02:22:02,937 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 105.9ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:02,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-22 02:22:02,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 330. [2021-05-22 02:22:02,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9969604863221884) internal successors, (986), 329 states have internal predecessors, (986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 986 transitions. [2021-05-22 02:22:02,941 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 986 transitions. Word has length 20 [2021-05-22 02:22:02,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:02,941 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 986 transitions. [2021-05-22 02:22:02,941 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:02,941 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 986 transitions. [2021-05-22 02:22:02,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:02,942 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:02,942 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:03,142 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 82 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable213 [2021-05-22 02:22:03,142 INFO L430 AbstractCegarLoop]: === Iteration 94 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:03,142 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:03,143 INFO L82 PathProgramCache]: Analyzing trace with hash -18031684, now seen corresponding path program 82 times [2021-05-22 02:22:03,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:03,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678856568] [2021-05-22 02:22:03,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:03,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:03,246 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:03,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:03,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678856568] [2021-05-22 02:22:03,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678856568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:03,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235202289] [2021-05-22 02:22:03,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 83 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:03,273 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:03,273 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:03,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:03,274 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:03,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:03,309 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,316 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:03,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,317 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:03,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:03,378 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,382 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:03,382 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:03,382 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,383 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:22:03,393 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:03,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [235202289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:03,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:03,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:03,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548195359] [2021-05-22 02:22:03,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:03,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:03,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:03,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:03,394 INFO L87 Difference]: Start difference. First operand 330 states and 986 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:03,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:03,538 INFO L93 Difference]: Finished difference Result 451 states and 1322 transitions. [2021-05-22 02:22:03,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:03,538 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:03,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:03,539 INFO L225 Difference]: With dead ends: 451 [2021-05-22 02:22:03,539 INFO L226 Difference]: Without dead ends: 436 [2021-05-22 02:22:03,539 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 146.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:03,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-05-22 02:22:03,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 336. [2021-05-22 02:22:03,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 3.011940298507463) internal successors, (1009), 335 states have internal predecessors, (1009), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:03,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1009 transitions. [2021-05-22 02:22:03,543 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1009 transitions. Word has length 20 [2021-05-22 02:22:03,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:03,543 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1009 transitions. [2021-05-22 02:22:03,543 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:03,543 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1009 transitions. [2021-05-22 02:22:03,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:03,543 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:03,543 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:03,744 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable214 [2021-05-22 02:22:03,744 INFO L430 AbstractCegarLoop]: === Iteration 95 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:03,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:03,744 INFO L82 PathProgramCache]: Analyzing trace with hash -519823020, now seen corresponding path program 83 times [2021-05-22 02:22:03,745 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:03,745 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457152875] [2021-05-22 02:22:03,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:03,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:03,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:03,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:03,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457152875] [2021-05-22 02:22:03,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457152875] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:03,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583597977] [2021-05-22 02:22:03,866 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:03,898 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:03,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:03,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:22:03,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:03,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:03,945 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:03,949 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:03,972 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:03,973 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:03,973 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:67, output treesize:53 [2021-05-22 02:22:04,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:22:04,047 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:04,050 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:04,061 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:04,062 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:04,062 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:33 [2021-05-22 02:22:04,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:04,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583597977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:04,147 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:04,147 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:04,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032028383] [2021-05-22 02:22:04,147 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:04,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:04,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:04,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:04,147 INFO L87 Difference]: Start difference. First operand 336 states and 1009 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:04,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:04,434 INFO L93 Difference]: Finished difference Result 501 states and 1479 transitions. [2021-05-22 02:22:04,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:04,434 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:04,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:04,435 INFO L225 Difference]: With dead ends: 501 [2021-05-22 02:22:04,435 INFO L226 Difference]: Without dead ends: 486 [2021-05-22 02:22:04,435 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 285.6ms TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:04,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-05-22 02:22:04,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 334. [2021-05-22 02:22:04,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 3.009009009009009) internal successors, (1002), 333 states have internal predecessors, (1002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:04,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 1002 transitions. [2021-05-22 02:22:04,439 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 1002 transitions. Word has length 20 [2021-05-22 02:22:04,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:04,439 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 1002 transitions. [2021-05-22 02:22:04,439 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:04,439 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 1002 transitions. [2021-05-22 02:22:04,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:04,439 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:04,440 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:04,640 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable215,84 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:04,640 INFO L430 AbstractCegarLoop]: === Iteration 96 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:04,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:04,640 INFO L82 PathProgramCache]: Analyzing trace with hash -2051668164, now seen corresponding path program 84 times [2021-05-22 02:22:04,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:04,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1953704203] [2021-05-22 02:22:04,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:04,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:04,745 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:04,745 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:04,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1953704203] [2021-05-22 02:22:04,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1953704203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:04,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1418527874] [2021-05-22 02:22:04,746 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 85 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:04,772 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:22:04,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:04,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:04,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:04,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:04,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:04,813 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,813 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:04,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:04,845 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:04,849 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:04,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:04,849 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:04,888 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:04,889 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1418527874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:04,889 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:04,889 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:04,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854490329] [2021-05-22 02:22:04,889 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:04,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:04,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:04,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:04,889 INFO L87 Difference]: Start difference. First operand 334 states and 1002 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:05,075 INFO L93 Difference]: Finished difference Result 503 states and 1480 transitions. [2021-05-22 02:22:05,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:05,076 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:05,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:05,076 INFO L225 Difference]: With dead ends: 503 [2021-05-22 02:22:05,077 INFO L226 Difference]: Without dead ends: 488 [2021-05-22 02:22:05,077 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 166.2ms TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:05,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-05-22 02:22:05,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 331. [2021-05-22 02:22:05,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 3.003030303030303) internal successors, (991), 330 states have internal predecessors, (991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 991 transitions. [2021-05-22 02:22:05,082 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 991 transitions. Word has length 20 [2021-05-22 02:22:05,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:05,083 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 991 transitions. [2021-05-22 02:22:05,083 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,083 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 991 transitions. [2021-05-22 02:22:05,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:05,083 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:05,083 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:05,296 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 85 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable224 [2021-05-22 02:22:05,297 INFO L430 AbstractCegarLoop]: === Iteration 97 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:05,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:05,297 INFO L82 PathProgramCache]: Analyzing trace with hash -547366286, now seen corresponding path program 85 times [2021-05-22 02:22:05,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:05,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631775241] [2021-05-22 02:22:05,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:05,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:05,411 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:05,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:05,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631775241] [2021-05-22 02:22:05,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631775241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:05,412 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257430518] [2021-05-22 02:22:05,412 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:05,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:05,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:05,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:05,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:05,490 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:05,496 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:05,497 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:05,497 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:05,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:05,528 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:05,534 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:05,534 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:05,534 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:05,534 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:22:05,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:05,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257430518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:05,556 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:05,556 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:22:05,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681282065] [2021-05-22 02:22:05,556 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:22:05,556 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:05,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:22:05,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:22:05,556 INFO L87 Difference]: Start difference. First operand 331 states and 991 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:05,691 INFO L93 Difference]: Finished difference Result 448 states and 1315 transitions. [2021-05-22 02:22:05,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:05,691 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:05,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:05,692 INFO L225 Difference]: With dead ends: 448 [2021-05-22 02:22:05,692 INFO L226 Difference]: Without dead ends: 433 [2021-05-22 02:22:05,692 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 140.0ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:22:05,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-05-22 02:22:05,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 330. [2021-05-22 02:22:05,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9969604863221884) internal successors, (986), 329 states have internal predecessors, (986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 986 transitions. [2021-05-22 02:22:05,696 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 986 transitions. Word has length 20 [2021-05-22 02:22:05,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:05,696 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 986 transitions. [2021-05-22 02:22:05,696 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:05,696 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 986 transitions. [2021-05-22 02:22:05,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:05,696 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:05,696 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:05,896 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable225,86 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:05,897 INFO L430 AbstractCegarLoop]: === Iteration 98 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:05,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:05,897 INFO L82 PathProgramCache]: Analyzing trace with hash 1142576618, now seen corresponding path program 86 times [2021-05-22 02:22:05,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:05,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360161931] [2021-05-22 02:22:05,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:05,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:06,006 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:06,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:06,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360161931] [2021-05-22 02:22:06,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360161931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:06,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632036269] [2021-05-22 02:22:06,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 87 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:06,033 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:06,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:06,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:06,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:06,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:06,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:06,074 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,074 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:22:06,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:06,093 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,098 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:06,098 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:06,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,098 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:22:06,154 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:06,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632036269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:06,154 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:06,154 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:06,154 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702550797] [2021-05-22 02:22:06,154 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:06,154 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:06,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:06,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:06,154 INFO L87 Difference]: Start difference. First operand 330 states and 986 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:06,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:06,284 INFO L93 Difference]: Finished difference Result 482 states and 1416 transitions. [2021-05-22 02:22:06,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:06,284 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:06,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:06,285 INFO L225 Difference]: With dead ends: 482 [2021-05-22 02:22:06,285 INFO L226 Difference]: Without dead ends: 467 [2021-05-22 02:22:06,285 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 177.6ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:06,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 467 states. [2021-05-22 02:22:06,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 467 to 325. [2021-05-22 02:22:06,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:06,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:22:06,289 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:22:06,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:06,289 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:22:06,289 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:06,289 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:22:06,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:06,289 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:06,289 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:06,492 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable226 [2021-05-22 02:22:06,493 INFO L430 AbstractCegarLoop]: === Iteration 99 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:06,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:06,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1692812560, now seen corresponding path program 87 times [2021-05-22 02:22:06,493 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:06,493 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1760489150] [2021-05-22 02:22:06,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:06,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:06,622 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:06,622 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:06,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1760489150] [2021-05-22 02:22:06,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1760489150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:06,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [970449773] [2021-05-22 02:22:06,622 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:06,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:06,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:06,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:06,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:06,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:06,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:06,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,740 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:06,743 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:06,743 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:06,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:06,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:06,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,834 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:06,836 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:06,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:06,837 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:06,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:06,846 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:06,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [970449773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:06,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:06,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:06,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871956720] [2021-05-22 02:22:06,876 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:06,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:06,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:06,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:06,877 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:07,102 INFO L93 Difference]: Finished difference Result 444 states and 1310 transitions. [2021-05-22 02:22:07,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:07,102 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:07,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:07,103 INFO L225 Difference]: With dead ends: 444 [2021-05-22 02:22:07,103 INFO L226 Difference]: Without dead ends: 429 [2021-05-22 02:22:07,103 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 213.8ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:07,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 429 states. [2021-05-22 02:22:07,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 429 to 331. [2021-05-22 02:22:07,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.984848484848485) internal successors, (985), 330 states have internal predecessors, (985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 985 transitions. [2021-05-22 02:22:07,107 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 985 transitions. Word has length 20 [2021-05-22 02:22:07,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:07,107 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 985 transitions. [2021-05-22 02:22:07,107 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,107 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 985 transitions. [2021-05-22 02:22:07,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:07,108 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:07,108 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:07,308 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 88 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable227 [2021-05-22 02:22:07,308 INFO L430 AbstractCegarLoop]: === Iteration 100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:07,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:07,308 INFO L82 PathProgramCache]: Analyzing trace with hash 2100363400, now seen corresponding path program 88 times [2021-05-22 02:22:07,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:07,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347142288] [2021-05-22 02:22:07,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:07,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:07,443 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:07,443 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:07,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347142288] [2021-05-22 02:22:07,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347142288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:07,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624523099] [2021-05-22 02:22:07,443 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 89 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:07,479 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:07,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:07,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:07,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:07,560 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:07,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:07,561 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:07,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:07,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:07,572 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:07,600 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:07,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:07,602 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:07,610 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:07,612 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:07,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:07,613 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:07,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:07,622 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:07,622 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:07,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:07,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624523099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:07,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:07,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:07,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057569675] [2021-05-22 02:22:07,667 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:07,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:07,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:07,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:07,668 INFO L87 Difference]: Start difference. First operand 331 states and 985 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:07,944 INFO L93 Difference]: Finished difference Result 450 states and 1323 transitions. [2021-05-22 02:22:07,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:07,945 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:07,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:07,945 INFO L225 Difference]: With dead ends: 450 [2021-05-22 02:22:07,945 INFO L226 Difference]: Without dead ends: 435 [2021-05-22 02:22:07,945 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 220.5ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:07,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2021-05-22 02:22:07,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 329. [2021-05-22 02:22:07,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:22:07,950 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:22:07,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:07,950 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:22:07,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:07,950 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:22:07,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:07,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:07,951 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:08,152 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable238,89 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:08,153 INFO L430 AbstractCegarLoop]: === Iteration 101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:08,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:08,153 INFO L82 PathProgramCache]: Analyzing trace with hash -6420720, now seen corresponding path program 89 times [2021-05-22 02:22:08,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:08,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976718504] [2021-05-22 02:22:08,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:08,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:08,274 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:08,274 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:08,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976718504] [2021-05-22 02:22:08,274 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1976718504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:08,274 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [68069417] [2021-05-22 02:22:08,274 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:08,300 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:08,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:08,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:08,301 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:08,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:08,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:08,378 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:08,385 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:08,386 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:08,386 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:08,422 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:08,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:08,423 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:08,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:08,436 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:08,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:08,437 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:08,445 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:08,446 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:08,446 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:08,489 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:08,490 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [68069417] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:08,490 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:08,490 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:08,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368507930] [2021-05-22 02:22:08,490 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:08,490 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:08,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:08,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:08,490 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:08,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:08,716 INFO L93 Difference]: Finished difference Result 441 states and 1301 transitions. [2021-05-22 02:22:08,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:08,716 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:08,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:08,717 INFO L225 Difference]: With dead ends: 441 [2021-05-22 02:22:08,717 INFO L226 Difference]: Without dead ends: 426 [2021-05-22 02:22:08,717 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 195.3ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:08,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-05-22 02:22:08,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 327. [2021-05-22 02:22:08,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:08,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:22:08,721 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:22:08,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:08,721 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:22:08,721 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:08,722 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:22:08,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:08,722 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:08,722 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:08,922 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable243,90 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:08,923 INFO L430 AbstractCegarLoop]: === Iteration 102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:08,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:08,923 INFO L82 PathProgramCache]: Analyzing trace with hash 29087378, now seen corresponding path program 90 times [2021-05-22 02:22:08,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:08,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131262605] [2021-05-22 02:22:08,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:08,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:09,054 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:09,054 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:09,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131262605] [2021-05-22 02:22:09,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [131262605] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:09,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [360320246] [2021-05-22 02:22:09,054 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 91 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:09,082 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:22:09,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:09,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:09,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:09,133 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:09,136 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,146 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:09,150 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:09,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:09,311 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,318 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,320 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:09,321 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,327 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,328 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,328 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:09,336 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:09,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [360320246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:09,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:09,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:22:09,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112648301] [2021-05-22 02:22:09,336 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:22:09,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:09,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:22:09,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:09,337 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:09,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:09,478 INFO L93 Difference]: Finished difference Result 412 states and 1206 transitions. [2021-05-22 02:22:09,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:09,479 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:09,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:09,479 INFO L225 Difference]: With dead ends: 412 [2021-05-22 02:22:09,479 INFO L226 Difference]: Without dead ends: 397 [2021-05-22 02:22:09,480 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 175.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:09,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-05-22 02:22:09,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 333. [2021-05-22 02:22:09,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 3.0) internal successors, (996), 332 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:09,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 996 transitions. [2021-05-22 02:22:09,483 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 996 transitions. Word has length 20 [2021-05-22 02:22:09,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:09,483 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 996 transitions. [2021-05-22 02:22:09,483 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:09,483 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 996 transitions. [2021-05-22 02:22:09,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:09,484 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:09,484 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:09,684 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 91 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable248 [2021-05-22 02:22:09,684 INFO L430 AbstractCegarLoop]: === Iteration 103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:09,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:09,685 INFO L82 PathProgramCache]: Analyzing trace with hash -472703958, now seen corresponding path program 91 times [2021-05-22 02:22:09,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:09,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457572162] [2021-05-22 02:22:09,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:09,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:09,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:09,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:09,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457572162] [2021-05-22 02:22:09,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457572162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:09,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [674434208] [2021-05-22 02:22:09,794 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:09,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:09,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:09,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:09,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:09,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,888 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:09,888 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:09,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:09,961 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,970 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:09,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:09,972 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,980 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:09,981 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:09,981 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:10,001 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:10,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [674434208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:10,001 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:10,001 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:10,001 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529708942] [2021-05-22 02:22:10,001 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:10,001 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:10,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:10,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:10,001 INFO L87 Difference]: Start difference. First operand 333 states and 996 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:10,192 INFO L93 Difference]: Finished difference Result 406 states and 1193 transitions. [2021-05-22 02:22:10,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:10,193 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:10,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:10,193 INFO L225 Difference]: With dead ends: 406 [2021-05-22 02:22:10,193 INFO L226 Difference]: Without dead ends: 391 [2021-05-22 02:22:10,194 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 161.3ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:10,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-05-22 02:22:10,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 331. [2021-05-22 02:22:10,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.996969696969697) internal successors, (989), 330 states have internal predecessors, (989), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 989 transitions. [2021-05-22 02:22:10,197 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 989 transitions. Word has length 20 [2021-05-22 02:22:10,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:10,197 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 989 transitions. [2021-05-22 02:22:10,197 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,197 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 989 transitions. [2021-05-22 02:22:10,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:10,198 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:10,198 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:10,400 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable259 [2021-05-22 02:22:10,401 INFO L430 AbstractCegarLoop]: === Iteration 104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:10,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:10,401 INFO L82 PathProgramCache]: Analyzing trace with hash -2004549102, now seen corresponding path program 92 times [2021-05-22 02:22:10,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:10,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65229189] [2021-05-22 02:22:10,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:10,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:10,547 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:10,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:10,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65229189] [2021-05-22 02:22:10,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65229189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:10,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1293964452] [2021-05-22 02:22:10,547 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 93 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:10,574 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:10,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:10,574 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:10,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:10,622 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:10,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:10,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:10,632 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:10,635 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:10,635 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:10,731 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:10,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:10,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:10,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:10,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:10,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:10,743 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:10,751 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:10,752 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:10,752 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:15 [2021-05-22 02:22:10,794 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:10,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1293964452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:10,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:10,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:10,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138205341] [2021-05-22 02:22:10,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:10,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:10,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:10,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:10,795 INFO L87 Difference]: Start difference. First operand 331 states and 989 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:10,953 INFO L93 Difference]: Finished difference Result 456 states and 1340 transitions. [2021-05-22 02:22:10,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:10,953 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:10,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:10,954 INFO L225 Difference]: With dead ends: 456 [2021-05-22 02:22:10,954 INFO L226 Difference]: Without dead ends: 441 [2021-05-22 02:22:10,954 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 229.3ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:10,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-05-22 02:22:10,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 328. [2021-05-22 02:22:10,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.9908256880733943) internal successors, (978), 327 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 978 transitions. [2021-05-22 02:22:10,958 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 978 transitions. Word has length 20 [2021-05-22 02:22:10,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:10,958 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 978 transitions. [2021-05-22 02:22:10,958 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:10,958 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 978 transitions. [2021-05-22 02:22:10,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:10,959 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:10,959 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:11,159 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable264,93 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:11,159 INFO L430 AbstractCegarLoop]: === Iteration 105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:11,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:11,160 INFO L82 PathProgramCache]: Analyzing trace with hash -500247224, now seen corresponding path program 93 times [2021-05-22 02:22:11,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:11,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81999043] [2021-05-22 02:22:11,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:11,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:11,262 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:11,262 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:11,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81999043] [2021-05-22 02:22:11,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81999043] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:11,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516287908] [2021-05-22 02:22:11,262 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:11,288 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:11,288 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:11,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:11,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:11,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:11,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:11,338 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:11,347 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:11,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:11,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:11,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:11,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:11,381 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:11,391 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:11,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:11,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:11,394 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:11,403 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:11,404 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:11,404 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:48, output treesize:18 [2021-05-22 02:22:11,427 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:11,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1516287908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:11,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:11,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:11,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825508953] [2021-05-22 02:22:11,428 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:11,428 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:11,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:11,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:11,428 INFO L87 Difference]: Start difference. First operand 328 states and 978 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:11,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:11,557 INFO L93 Difference]: Finished difference Result 414 states and 1215 transitions. [2021-05-22 02:22:11,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:11,558 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:11,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:11,558 INFO L225 Difference]: With dead ends: 414 [2021-05-22 02:22:11,558 INFO L226 Difference]: Without dead ends: 399 [2021-05-22 02:22:11,558 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 141.0ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:11,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-22 02:22:11,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 327. [2021-05-22 02:22:11,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:11,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:22:11,562 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:22:11,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:11,562 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:22:11,562 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:11,563 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:22:11,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:11,563 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:11,563 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:11,763 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable271 [2021-05-22 02:22:11,764 INFO L430 AbstractCegarLoop]: === Iteration 106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:11,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:11,764 INFO L82 PathProgramCache]: Analyzing trace with hash -860261966, now seen corresponding path program 94 times [2021-05-22 02:22:11,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:11,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2111488311] [2021-05-22 02:22:11,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:11,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:11,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:11,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:11,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2111488311] [2021-05-22 02:22:11,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2111488311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:11,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [565031943] [2021-05-22 02:22:11,896 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 95 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:11,921 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:11,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:11,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:11,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:11,972 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:11,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:11,973 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:11,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:11,982 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:11,983 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:12,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:12,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:12,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,054 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:12,055 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:12,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:12,056 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:12,065 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,065 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:12,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:12,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [565031943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:12,123 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:12,123 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:12,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736640064] [2021-05-22 02:22:12,123 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:12,123 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:12,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:12,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:12,124 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:12,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:12,362 INFO L93 Difference]: Finished difference Result 459 states and 1346 transitions. [2021-05-22 02:22:12,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:12,362 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:12,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:12,363 INFO L225 Difference]: With dead ends: 459 [2021-05-22 02:22:12,363 INFO L226 Difference]: Without dead ends: 444 [2021-05-22 02:22:12,363 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 224.5ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:12,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-05-22 02:22:12,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 330. [2021-05-22 02:22:12,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9939209726443767) internal successors, (985), 329 states have internal predecessors, (985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:12,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 985 transitions. [2021-05-22 02:22:12,367 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 985 transitions. Word has length 20 [2021-05-22 02:22:12,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:12,367 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 985 transitions. [2021-05-22 02:22:12,367 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:12,367 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 985 transitions. [2021-05-22 02:22:12,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:12,368 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:12,368 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:12,568 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable272,95 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:12,568 INFO L430 AbstractCegarLoop]: === Iteration 107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:12,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:12,568 INFO L82 PathProgramCache]: Analyzing trace with hash 2104777168, now seen corresponding path program 95 times [2021-05-22 02:22:12,568 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:12,568 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825870853] [2021-05-22 02:22:12,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:12,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:12,697 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:12,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:12,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825870853] [2021-05-22 02:22:12,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825870853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:12,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1438247203] [2021-05-22 02:22:12,698 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:12,723 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:12,724 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:12,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:12,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:12,771 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:12,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:12,772 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,780 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:12,782 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:12,782 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:12,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:12,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:12,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:12,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:12,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:12,821 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,830 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:12,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:12,845 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:48, output treesize:15 [2021-05-22 02:22:12,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:12,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1438247203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:12,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:12,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:12,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780112205] [2021-05-22 02:22:12,909 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:12,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:12,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:12,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:12,909 INFO L87 Difference]: Start difference. First operand 330 states and 985 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:13,108 INFO L93 Difference]: Finished difference Result 453 states and 1331 transitions. [2021-05-22 02:22:13,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:13,108 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:13,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:13,109 INFO L225 Difference]: With dead ends: 453 [2021-05-22 02:22:13,109 INFO L226 Difference]: Without dead ends: 438 [2021-05-22 02:22:13,109 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 213.5ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:13,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-22 02:22:13,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 326. [2021-05-22 02:22:13,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9815384615384617) internal successors, (969), 325 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 969 transitions. [2021-05-22 02:22:13,113 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 969 transitions. Word has length 20 [2021-05-22 02:22:13,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:13,113 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 969 transitions. [2021-05-22 02:22:13,113 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,113 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 969 transitions. [2021-05-22 02:22:13,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:13,113 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:13,113 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:13,314 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 96 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable277 [2021-05-22 02:22:13,314 INFO L430 AbstractCegarLoop]: === Iteration 108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:13,314 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:13,314 INFO L82 PathProgramCache]: Analyzing trace with hash 1726332322, now seen corresponding path program 96 times [2021-05-22 02:22:13,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:13,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476993371] [2021-05-22 02:22:13,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:13,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:13,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:13,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:13,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476993371] [2021-05-22 02:22:13,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476993371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:13,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [361308509] [2021-05-22 02:22:13,428 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 97 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:13,454 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:13,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:13,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:13,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:13,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:13,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:13,504 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:13,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:13,516 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:13,516 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:13,656 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:13,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:13,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:13,664 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:13,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:13,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:13,667 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:13,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:13,674 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:13,674 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:13,700 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:13,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [361308509] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:13,700 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:13,700 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:13,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396811393] [2021-05-22 02:22:13,700 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:13,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:13,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:13,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:13,701 INFO L87 Difference]: Start difference. First operand 326 states and 969 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:13,870 INFO L93 Difference]: Finished difference Result 445 states and 1313 transitions. [2021-05-22 02:22:13,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:13,870 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:13,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:13,871 INFO L225 Difference]: With dead ends: 445 [2021-05-22 02:22:13,871 INFO L226 Difference]: Without dead ends: 430 [2021-05-22 02:22:13,871 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 206.7ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:13,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-05-22 02:22:13,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 336. [2021-05-22 02:22:13,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.997014925373134) internal successors, (1004), 335 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1004 transitions. [2021-05-22 02:22:13,875 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1004 transitions. Word has length 20 [2021-05-22 02:22:13,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:13,875 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1004 transitions. [2021-05-22 02:22:13,875 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:13,875 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1004 transitions. [2021-05-22 02:22:13,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:13,875 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:13,875 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:14,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable278 [2021-05-22 02:22:14,077 INFO L430 AbstractCegarLoop]: === Iteration 109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:14,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:14,077 INFO L82 PathProgramCache]: Analyzing trace with hash 1224540986, now seen corresponding path program 97 times [2021-05-22 02:22:14,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:14,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1648367971] [2021-05-22 02:22:14,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:14,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:14,201 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:14,201 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:14,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1648367971] [2021-05-22 02:22:14,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1648367971] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:14,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547558501] [2021-05-22 02:22:14,201 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:14,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:14,227 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:14,276 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:14,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:14,277 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:14,286 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:14,289 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:14,290 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:14,378 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:14,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:14,379 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:14,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:14,392 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:14,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:14,393 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:14,404 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:14,405 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:14,405 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:14,464 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:14,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547558501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:14,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:14,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:14,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886749494] [2021-05-22 02:22:14,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:14,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:14,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:14,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:14,465 INFO L87 Difference]: Start difference. First operand 336 states and 1004 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:14,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:14,704 INFO L93 Difference]: Finished difference Result 451 states and 1326 transitions. [2021-05-22 02:22:14,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:14,705 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:14,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:14,705 INFO L225 Difference]: With dead ends: 451 [2021-05-22 02:22:14,705 INFO L226 Difference]: Without dead ends: 436 [2021-05-22 02:22:14,705 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 226.1ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:14,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-05-22 02:22:14,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 334. [2021-05-22 02:22:14,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 2.993993993993994) internal successors, (997), 333 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:14,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 997 transitions. [2021-05-22 02:22:14,709 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 997 transitions. Word has length 20 [2021-05-22 02:22:14,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:14,709 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 997 transitions. [2021-05-22 02:22:14,709 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:14,709 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 997 transitions. [2021-05-22 02:22:14,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:14,710 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:14,710 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:14,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable291,98 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:14,913 INFO L430 AbstractCegarLoop]: === Iteration 110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:14,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:14,913 INFO L82 PathProgramCache]: Analyzing trace with hash -307304158, now seen corresponding path program 98 times [2021-05-22 02:22:14,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:14,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079164846] [2021-05-22 02:22:14,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:14,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:15,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:15,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:15,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079164846] [2021-05-22 02:22:15,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079164846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:15,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622702132] [2021-05-22 02:22:15,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 99 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:15,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:15,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:15,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:15,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:15,136 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:15,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:15,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:15,151 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:15,155 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:15,155 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:43, output treesize:36 [2021-05-22 02:22:15,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:15,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:15,271 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:15,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:15,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:15,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:15,282 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:15,289 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:15,290 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:15,290 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:12 [2021-05-22 02:22:15,304 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:15,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622702132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:15,304 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:15,304 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:15,304 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132454271] [2021-05-22 02:22:15,304 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:15,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:15,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:15,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:15,305 INFO L87 Difference]: Start difference. First operand 334 states and 997 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:15,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:15,523 INFO L93 Difference]: Finished difference Result 405 states and 1189 transitions. [2021-05-22 02:22:15,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:15,524 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:15,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:15,525 INFO L225 Difference]: With dead ends: 405 [2021-05-22 02:22:15,525 INFO L226 Difference]: Without dead ends: 390 [2021-05-22 02:22:15,525 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 185.5ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:15,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2021-05-22 02:22:15,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 331. [2021-05-22 02:22:15,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.987878787878788) internal successors, (986), 330 states have internal predecessors, (986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:15,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 986 transitions. [2021-05-22 02:22:15,529 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 986 transitions. Word has length 20 [2021-05-22 02:22:15,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:15,530 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 986 transitions. [2021-05-22 02:22:15,530 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:15,530 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 986 transitions. [2021-05-22 02:22:15,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:15,530 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:15,530 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:15,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable298,99 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:15,731 INFO L430 AbstractCegarLoop]: === Iteration 111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:15,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:15,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1196997720, now seen corresponding path program 99 times [2021-05-22 02:22:15,731 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:15,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22304411] [2021-05-22 02:22:15,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:15,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:15,876 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:15,876 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:15,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22304411] [2021-05-22 02:22:15,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22304411] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:15,876 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1494979870] [2021-05-22 02:22:15,877 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:15,908 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:15,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:15,909 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:15,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:15,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:15,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:15,975 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:15,987 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:15,992 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:15,992 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:22:16,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:16,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:16,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,046 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:16,049 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:16,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:16,050 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,063 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:16,064 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,064 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:48, output treesize:18 [2021-05-22 02:22:16,146 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:16,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1494979870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:16,146 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:16,146 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:16,146 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231277952] [2021-05-22 02:22:16,146 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:16,147 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:16,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:16,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:16,147 INFO L87 Difference]: Start difference. First operand 331 states and 986 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:16,327 INFO L93 Difference]: Finished difference Result 467 states and 1372 transitions. [2021-05-22 02:22:16,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:16,328 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:16,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:16,328 INFO L225 Difference]: With dead ends: 467 [2021-05-22 02:22:16,328 INFO L226 Difference]: Without dead ends: 452 [2021-05-22 02:22:16,329 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 259.6ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:16,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-05-22 02:22:16,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 330. [2021-05-22 02:22:16,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9817629179331306) internal successors, (981), 329 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 981 transitions. [2021-05-22 02:22:16,332 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 981 transitions. Word has length 20 [2021-05-22 02:22:16,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:16,332 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 981 transitions. [2021-05-22 02:22:16,332 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,332 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 981 transitions. [2021-05-22 02:22:16,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:16,333 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:16,333 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:16,533 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable307 [2021-05-22 02:22:16,534 INFO L430 AbstractCegarLoop]: === Iteration 112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:16,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:16,534 INFO L82 PathProgramCache]: Analyzing trace with hash 310958010, now seen corresponding path program 100 times [2021-05-22 02:22:16,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:16,534 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169706552] [2021-05-22 02:22:16,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:16,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:16,655 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:16,655 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:16,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169706552] [2021-05-22 02:22:16,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169706552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:16,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141873912] [2021-05-22 02:22:16,656 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:16,683 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:16,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:16,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:16,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:16,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:16,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:16,770 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,777 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:16,778 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:16,778 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:22:16,803 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:16,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:16,804 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:16,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:16,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:16,816 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,824 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:16,824 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:16,825 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:12 [2021-05-22 02:22:16,837 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:16,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141873912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:16,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:16,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:16,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089814585] [2021-05-22 02:22:16,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:16,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:16,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:16,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:16,838 INFO L87 Difference]: Start difference. First operand 330 states and 981 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:16,955 INFO L93 Difference]: Finished difference Result 394 states and 1161 transitions. [2021-05-22 02:22:16,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:16,956 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:16,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:16,956 INFO L225 Difference]: With dead ends: 394 [2021-05-22 02:22:16,956 INFO L226 Difference]: Without dead ends: 379 [2021-05-22 02:22:16,956 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 164.4ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:16,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 379 states. [2021-05-22 02:22:16,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 379 to 327. [2021-05-22 02:22:16,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:22:16,960 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:22:16,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:16,960 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:22:16,960 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:16,960 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:22:16,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:16,960 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:16,960 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:17,161 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable308,101 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:17,161 INFO L430 AbstractCegarLoop]: === Iteration 113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:17,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:17,161 INFO L82 PathProgramCache]: Analyzing trace with hash -1408026672, now seen corresponding path program 101 times [2021-05-22 02:22:17,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:17,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126746119] [2021-05-22 02:22:17,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:17,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:17,315 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:17,315 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:17,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126746119] [2021-05-22 02:22:17,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126746119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:17,315 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787631991] [2021-05-22 02:22:17,315 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:17,341 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:17,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:17,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:22:17,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:17,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:17,390 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:17,397 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:17,398 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:17,398 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:22:17,426 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,426 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:17,427 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:17,430 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:17,430 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:17,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:17,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,464 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:17,465 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:17,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:17,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:17,468 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:17,496 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:17,497 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:17,497 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:99, output treesize:41 [2021-05-22 02:22:17,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:17,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787631991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:17,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:17,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:17,602 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859167311] [2021-05-22 02:22:17,602 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:17,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:17,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:17,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:17,602 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:17,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:17,810 INFO L93 Difference]: Finished difference Result 485 states and 1434 transitions. [2021-05-22 02:22:17,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:22:17,810 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:17,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:17,811 INFO L225 Difference]: With dead ends: 485 [2021-05-22 02:22:17,811 INFO L226 Difference]: Without dead ends: 470 [2021-05-22 02:22:17,811 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 294.3ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:22:17,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-05-22 02:22:17,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 326. [2021-05-22 02:22:17,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9815384615384617) internal successors, (969), 325 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:17,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 969 transitions. [2021-05-22 02:22:17,815 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 969 transitions. Word has length 20 [2021-05-22 02:22:17,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:17,815 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 969 transitions. [2021-05-22 02:22:17,815 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:17,815 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 969 transitions. [2021-05-22 02:22:17,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:17,816 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:17,816 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:18,034 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable313 [2021-05-22 02:22:18,035 INFO L430 AbstractCegarLoop]: === Iteration 114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:18,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:18,035 INFO L82 PathProgramCache]: Analyzing trace with hash -11639494, now seen corresponding path program 102 times [2021-05-22 02:22:18,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:18,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1206588067] [2021-05-22 02:22:18,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:18,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:18,130 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:18,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:18,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1206588067] [2021-05-22 02:22:18,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1206588067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:18,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1506759759] [2021-05-22 02:22:18,131 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:18,170 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:18,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:18,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:18,172 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:18,219 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:18,221 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,229 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,231 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:18,231 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:18,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:18,317 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,326 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,328 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:18,329 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,338 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,339 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,339 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:22:18,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:18,353 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1506759759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:18,354 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:18,354 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:18,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479822967] [2021-05-22 02:22:18,354 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:18,354 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:18,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:18,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:18,354 INFO L87 Difference]: Start difference. First operand 326 states and 969 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:18,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:18,514 INFO L93 Difference]: Finished difference Result 389 states and 1147 transitions. [2021-05-22 02:22:18,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:18,515 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:18,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:18,515 INFO L225 Difference]: With dead ends: 389 [2021-05-22 02:22:18,515 INFO L226 Difference]: Without dead ends: 374 [2021-05-22 02:22:18,515 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 152.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:18,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-05-22 02:22:18,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 332. [2021-05-22 02:22:18,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.990936555891239) internal successors, (990), 331 states have internal predecessors, (990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:18,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 990 transitions. [2021-05-22 02:22:18,520 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 990 transitions. Word has length 20 [2021-05-22 02:22:18,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:18,521 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 990 transitions. [2021-05-22 02:22:18,522 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:18,522 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 990 transitions. [2021-05-22 02:22:18,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:18,522 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:18,522 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:18,723 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable318,103 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:18,723 INFO L430 AbstractCegarLoop]: === Iteration 115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:18,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:18,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1341567656, now seen corresponding path program 103 times [2021-05-22 02:22:18,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:18,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126547765] [2021-05-22 02:22:18,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:18,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:18,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:18,838 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:18,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126547765] [2021-05-22 02:22:18,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126547765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:18,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1647647470] [2021-05-22 02:22:18,839 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:18,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:18,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:18,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:18,910 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:18,911 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,920 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:18,920 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:18,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:18,947 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,957 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,959 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:18,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:18,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,968 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:18,969 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:18,969 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:22:19,025 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:19,025 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1647647470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:19,025 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:19,025 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:19,025 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819353713] [2021-05-22 02:22:19,026 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:19,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:19,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:19,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:19,026 INFO L87 Difference]: Start difference. First operand 332 states and 990 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:19,199 INFO L93 Difference]: Finished difference Result 453 states and 1331 transitions. [2021-05-22 02:22:19,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:19,199 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:19,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:19,200 INFO L225 Difference]: With dead ends: 453 [2021-05-22 02:22:19,200 INFO L226 Difference]: Without dead ends: 438 [2021-05-22 02:22:19,200 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 191.7ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:19,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2021-05-22 02:22:19,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 329. [2021-05-22 02:22:19,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:22:19,205 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:22:19,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:19,205 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:22:19,205 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,205 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:22:19,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:19,205 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:19,205 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:19,405 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 104 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable323 [2021-05-22 02:22:19,406 INFO L430 AbstractCegarLoop]: === Iteration 116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:19,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:19,406 INFO L82 PathProgramCache]: Analyzing trace with hash 2038318152, now seen corresponding path program 104 times [2021-05-22 02:22:19,406 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:19,406 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1505499551] [2021-05-22 02:22:19,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:19,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:19,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:19,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:19,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1505499551] [2021-05-22 02:22:19,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1505499551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:19,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599653254] [2021-05-22 02:22:19,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:19,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:19,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:19,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:19,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:19,578 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:19,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:19,580 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:19,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:19,589 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:19,589 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:22:19,615 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:19,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:19,616 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:19,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:19,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:19,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:19,628 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:19,637 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:19,638 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:19,638 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:15 [2021-05-22 02:22:19,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:19,695 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599653254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:19,695 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:19,695 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:19,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1749717232] [2021-05-22 02:22:19,696 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:19,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:19,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:19,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:19,696 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:19,883 INFO L93 Difference]: Finished difference Result 445 states and 1312 transitions. [2021-05-22 02:22:19,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:19,883 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:19,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:19,884 INFO L225 Difference]: With dead ends: 445 [2021-05-22 02:22:19,884 INFO L226 Difference]: Without dead ends: 430 [2021-05-22 02:22:19,884 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 179.5ms TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:19,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2021-05-22 02:22:19,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 324. [2021-05-22 02:22:19,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 2.981424148606811) internal successors, (963), 323 states have internal predecessors, (963), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 963 transitions. [2021-05-22 02:22:19,888 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 963 transitions. Word has length 20 [2021-05-22 02:22:19,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:19,888 INFO L482 AbstractCegarLoop]: Abstraction has 324 states and 963 transitions. [2021-05-22 02:22:19,888 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:19,888 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 963 transitions. [2021-05-22 02:22:19,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:19,888 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:19,888 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:20,089 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable324 [2021-05-22 02:22:20,089 INFO L430 AbstractCegarLoop]: === Iteration 117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:20,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:20,089 INFO L82 PathProgramCache]: Analyzing trace with hash -1175221912, now seen corresponding path program 105 times [2021-05-22 02:22:20,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:20,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599046560] [2021-05-22 02:22:20,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:20,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:20,207 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:20,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:20,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599046560] [2021-05-22 02:22:20,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599046560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:20,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065769676] [2021-05-22 02:22:20,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:20,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:20,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:20,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:20,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:20,307 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:20,307 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:20,308 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:20,315 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:20,316 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:20,316 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:20,369 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:20,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:20,370 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:20,377 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:20,379 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:20,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:20,379 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:20,386 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:20,387 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:20,387 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:9 [2021-05-22 02:22:20,413 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:20,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065769676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:20,413 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:20,414 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:20,414 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886426726] [2021-05-22 02:22:20,414 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:20,414 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:20,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:20,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:20,414 INFO L87 Difference]: Start difference. First operand 324 states and 963 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:20,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:20,668 INFO L93 Difference]: Finished difference Result 449 states and 1325 transitions. [2021-05-22 02:22:20,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:20,668 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:20,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:20,669 INFO L225 Difference]: With dead ends: 449 [2021-05-22 02:22:20,669 INFO L226 Difference]: Without dead ends: 434 [2021-05-22 02:22:20,669 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 199.3ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:20,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-05-22 02:22:20,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 330. [2021-05-22 02:22:20,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9848024316109423) internal successors, (982), 329 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:20,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 982 transitions. [2021-05-22 02:22:20,674 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 982 transitions. Word has length 20 [2021-05-22 02:22:20,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:20,674 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 982 transitions. [2021-05-22 02:22:20,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:20,674 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 982 transitions. [2021-05-22 02:22:20,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:20,674 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:20,674 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:20,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable325 [2021-05-22 02:22:20,875 INFO L430 AbstractCegarLoop]: === Iteration 118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:20,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:20,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1677013248, now seen corresponding path program 106 times [2021-05-22 02:22:20,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:20,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955362412] [2021-05-22 02:22:20,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:20,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:20,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:20,994 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:20,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955362412] [2021-05-22 02:22:20,994 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955362412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:20,994 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007258762] [2021-05-22 02:22:20,994 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:21,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:21,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:21,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:21,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:21,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:21,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:21,093 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,100 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,101 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:21,101 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:21,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:21,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:21,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,138 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:21,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:21,141 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,148 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,149 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:21,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007258762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:21,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:21,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:21,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1214648815] [2021-05-22 02:22:21,192 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:21,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:21,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:21,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:21,193 INFO L87 Difference]: Start difference. First operand 330 states and 982 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:21,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:21,429 INFO L93 Difference]: Finished difference Result 455 states and 1338 transitions. [2021-05-22 02:22:21,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:21,430 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:21,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:21,430 INFO L225 Difference]: With dead ends: 455 [2021-05-22 02:22:21,431 INFO L226 Difference]: Without dead ends: 440 [2021-05-22 02:22:21,431 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 201.9ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:21,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 440 states. [2021-05-22 02:22:21,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 440 to 328. [2021-05-22 02:22:21,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.981651376146789) internal successors, (975), 327 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:21,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 975 transitions. [2021-05-22 02:22:21,436 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 975 transitions. Word has length 20 [2021-05-22 02:22:21,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:21,436 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 975 transitions. [2021-05-22 02:22:21,436 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:21,436 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 975 transitions. [2021-05-22 02:22:21,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:21,437 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:21,437 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:21,652 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable330,107 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:21,653 INFO L430 AbstractCegarLoop]: === Iteration 119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:21,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:21,653 INFO L82 PathProgramCache]: Analyzing trace with hash 511169928, now seen corresponding path program 107 times [2021-05-22 02:22:21,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:21,653 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323428395] [2021-05-22 02:22:21,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:21,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:21,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:21,770 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:21,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323428395] [2021-05-22 02:22:21,770 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323428395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:21,770 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976566593] [2021-05-22 02:22:21,770 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:21,796 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:21,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:21,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:21,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:21,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:21,883 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,889 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,890 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:21,890 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:22:21,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:21,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:21,914 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,920 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,921 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:21,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:21,922 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:21,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:21,928 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:21,972 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:21,972 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976566593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:21,972 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:21,972 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:21,972 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275756871] [2021-05-22 02:22:21,972 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:21,972 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:21,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:21,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:21,973 INFO L87 Difference]: Start difference. First operand 328 states and 975 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:22,137 INFO L93 Difference]: Finished difference Result 446 states and 1316 transitions. [2021-05-22 02:22:22,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:22,137 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:22,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:22,137 INFO L225 Difference]: With dead ends: 446 [2021-05-22 02:22:22,138 INFO L226 Difference]: Without dead ends: 431 [2021-05-22 02:22:22,138 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 206.1ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:22,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 431 states. [2021-05-22 02:22:22,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 431 to 326. [2021-05-22 02:22:22,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9846153846153847) internal successors, (970), 325 states have internal predecessors, (970), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 970 transitions. [2021-05-22 02:22:22,141 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 970 transitions. Word has length 20 [2021-05-22 02:22:22,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:22,141 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 970 transitions. [2021-05-22 02:22:22,141 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,141 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 970 transitions. [2021-05-22 02:22:22,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:22,142 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:22,142 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:22,342 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 108 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable335 [2021-05-22 02:22:22,342 INFO L430 AbstractCegarLoop]: === Iteration 120 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:22,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:22,343 INFO L82 PathProgramCache]: Analyzing trace with hash 546678026, now seen corresponding path program 108 times [2021-05-22 02:22:22,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:22,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530856085] [2021-05-22 02:22:22,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:22,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:22,458 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:22,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:22,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530856085] [2021-05-22 02:22:22,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1530856085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:22,459 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768375987] [2021-05-22 02:22:22,459 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:22,498 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:22:22,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:22,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:22,499 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:22,559 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:22,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:22,561 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:22,572 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:22,573 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:22,573 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:22,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:22,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:22,687 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:22,696 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:22,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:22,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:22,699 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:22,708 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:22,709 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:22,709 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:9 [2021-05-22 02:22:22,730 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:22,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1768375987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:22,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:22,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:22:22,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562452258] [2021-05-22 02:22:22,730 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:22:22,730 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:22,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:22:22,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:22,731 INFO L87 Difference]: Start difference. First operand 326 states and 970 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:22,943 INFO L93 Difference]: Finished difference Result 416 states and 1218 transitions. [2021-05-22 02:22:22,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:22,944 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:22,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:22,944 INFO L225 Difference]: With dead ends: 416 [2021-05-22 02:22:22,944 INFO L226 Difference]: Without dead ends: 401 [2021-05-22 02:22:22,945 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 204.2ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:22,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-05-22 02:22:22,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 332. [2021-05-22 02:22:22,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 3.0) internal successors, (993), 331 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 993 transitions. [2021-05-22 02:22:22,948 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 993 transitions. Word has length 20 [2021-05-22 02:22:22,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:22,948 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 993 transitions. [2021-05-22 02:22:22,948 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:22,948 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 993 transitions. [2021-05-22 02:22:22,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:22,949 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:22,949 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:23,149 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable339,109 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:23,149 INFO L430 AbstractCegarLoop]: === Iteration 121 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:23,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:23,150 INFO L82 PathProgramCache]: Analyzing trace with hash 44886690, now seen corresponding path program 109 times [2021-05-22 02:22:23,150 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:23,150 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999018296] [2021-05-22 02:22:23,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:23,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:23,253 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:23,253 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:23,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999018296] [2021-05-22 02:22:23,253 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [999018296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:23,253 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769894950] [2021-05-22 02:22:23,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:23,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:23,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:23,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:23,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:23,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:23,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:23,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:23,336 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:23,336 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:23,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:23,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:23,394 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:23,402 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:23,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:23,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:23,405 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:23,413 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:23,414 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:23,414 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:23,433 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:23,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769894950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:23,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:23,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:23,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636076459] [2021-05-22 02:22:23,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:23,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:23,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:23,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:23,434 INFO L87 Difference]: Start difference. First operand 332 states and 993 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:23,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:23,605 INFO L93 Difference]: Finished difference Result 410 states and 1205 transitions. [2021-05-22 02:22:23,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:23,605 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:23,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:23,606 INFO L225 Difference]: With dead ends: 410 [2021-05-22 02:22:23,606 INFO L226 Difference]: Without dead ends: 395 [2021-05-22 02:22:23,606 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 154.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:23,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 395 states. [2021-05-22 02:22:23,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 395 to 330. [2021-05-22 02:22:23,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9969604863221884) internal successors, (986), 329 states have internal predecessors, (986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:23,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 986 transitions. [2021-05-22 02:22:23,610 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 986 transitions. Word has length 20 [2021-05-22 02:22:23,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:23,610 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 986 transitions. [2021-05-22 02:22:23,610 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:23,610 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 986 transitions. [2021-05-22 02:22:23,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:23,610 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:23,610 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:23,811 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable344 [2021-05-22 02:22:23,811 INFO L430 AbstractCegarLoop]: === Iteration 122 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:23,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:23,811 INFO L82 PathProgramCache]: Analyzing trace with hash -1486958454, now seen corresponding path program 110 times [2021-05-22 02:22:23,811 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:23,811 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562656533] [2021-05-22 02:22:23,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:23,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:23,938 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:23,939 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:23,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562656533] [2021-05-22 02:22:23,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562656533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:23,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [511338326] [2021-05-22 02:22:23,939 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:23,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:23,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:23,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:23,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:24,011 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:24,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:24,021 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:24,077 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:24,078 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,086 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:24,089 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,098 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:12 [2021-05-22 02:22:24,143 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:24,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [511338326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:24,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:24,144 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:24,144 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569125195] [2021-05-22 02:22:24,144 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:24,144 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:24,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:24,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:24,144 INFO L87 Difference]: Start difference. First operand 330 states and 986 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:24,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:24,365 INFO L93 Difference]: Finished difference Result 461 states and 1355 transitions. [2021-05-22 02:22:24,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:24,366 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:24,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:24,366 INFO L225 Difference]: With dead ends: 461 [2021-05-22 02:22:24,366 INFO L226 Difference]: Without dead ends: 446 [2021-05-22 02:22:24,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 203.3ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:24,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 446 states. [2021-05-22 02:22:24,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 446 to 327. [2021-05-22 02:22:24,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9907975460122698) internal successors, (975), 326 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:24,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 975 transitions. [2021-05-22 02:22:24,370 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 975 transitions. Word has length 20 [2021-05-22 02:22:24,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:24,370 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 975 transitions. [2021-05-22 02:22:24,370 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:24,370 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 975 transitions. [2021-05-22 02:22:24,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:24,371 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:24,371 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:24,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable349 [2021-05-22 02:22:24,577 INFO L430 AbstractCegarLoop]: === Iteration 123 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:24,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:24,577 INFO L82 PathProgramCache]: Analyzing trace with hash 17343424, now seen corresponding path program 111 times [2021-05-22 02:22:24,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:24,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990569560] [2021-05-22 02:22:24,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:24,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:24,674 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:24,674 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:24,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990569560] [2021-05-22 02:22:24,674 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990569560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:24,674 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538399226] [2021-05-22 02:22:24,674 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:24,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:24,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:24,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:24,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:24,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:24,748 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,756 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,758 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:24,758 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:24,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:24,787 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,797 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:24,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:24,800 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,809 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:24,810 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:24,810 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:48, output treesize:18 [2021-05-22 02:22:24,833 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:24,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538399226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:24,833 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:24,833 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:24,833 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2133163149] [2021-05-22 02:22:24,833 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:24,833 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:24,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:24,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:24,834 INFO L87 Difference]: Start difference. First operand 327 states and 975 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:25,016 INFO L93 Difference]: Finished difference Result 418 states and 1227 transitions. [2021-05-22 02:22:25,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:25,016 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:25,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:25,017 INFO L225 Difference]: With dead ends: 418 [2021-05-22 02:22:25,017 INFO L226 Difference]: Without dead ends: 403 [2021-05-22 02:22:25,017 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 133.2ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:25,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-22 02:22:25,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 326. [2021-05-22 02:22:25,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9846153846153847) internal successors, (970), 325 states have internal predecessors, (970), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 970 transitions. [2021-05-22 02:22:25,020 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 970 transitions. Word has length 20 [2021-05-22 02:22:25,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:25,021 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 970 transitions. [2021-05-22 02:22:25,021 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,021 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 970 transitions. [2021-05-22 02:22:25,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:25,021 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:25,021 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:25,221 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable350,112 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:25,222 INFO L430 AbstractCegarLoop]: === Iteration 124 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:25,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:25,222 INFO L82 PathProgramCache]: Analyzing trace with hash -342671318, now seen corresponding path program 112 times [2021-05-22 02:22:25,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:25,222 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26603493] [2021-05-22 02:22:25,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:25,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:25,346 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:25,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:25,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26603493] [2021-05-22 02:22:25,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26603493] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:25,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1446673299] [2021-05-22 02:22:25,347 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:25,372 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:25,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:25,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:25,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:25,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:25,413 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:25,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:25,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:25,421 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:25,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:25,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:25,476 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:25,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:25,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:25,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:25,484 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:25,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:25,491 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:25,491 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:25,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:25,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1446673299] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:25,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:25,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:25,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125265602] [2021-05-22 02:22:25,534 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:25,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:25,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:25,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:25,534 INFO L87 Difference]: Start difference. First operand 326 states and 970 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:25,716 INFO L93 Difference]: Finished difference Result 464 states and 1361 transitions. [2021-05-22 02:22:25,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:25,716 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:25,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:25,716 INFO L225 Difference]: With dead ends: 464 [2021-05-22 02:22:25,717 INFO L226 Difference]: Without dead ends: 449 [2021-05-22 02:22:25,717 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 202.8ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:25,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 449 states. [2021-05-22 02:22:25,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 449 to 329. [2021-05-22 02:22:25,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.9939024390243905) internal successors, (982), 328 states have internal predecessors, (982), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 982 transitions. [2021-05-22 02:22:25,720 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 982 transitions. Word has length 20 [2021-05-22 02:22:25,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:25,720 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 982 transitions. [2021-05-22 02:22:25,720 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:25,721 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 982 transitions. [2021-05-22 02:22:25,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:25,721 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:25,721 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:25,921 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable351,113 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:25,921 INFO L430 AbstractCegarLoop]: === Iteration 125 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:25,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:25,922 INFO L82 PathProgramCache]: Analyzing trace with hash -1672599480, now seen corresponding path program 113 times [2021-05-22 02:22:25,922 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:25,922 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1510679527] [2021-05-22 02:22:25,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:25,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:26,055 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:26,055 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:26,055 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1510679527] [2021-05-22 02:22:26,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1510679527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:26,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1203302207] [2021-05-22 02:22:26,056 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:26,092 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:26,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:26,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:26,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:26,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:26,134 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,141 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,142 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:26,142 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:26,165 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:26,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:26,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:26,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:26,176 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,183 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:26,241 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:26,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1203302207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:26,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:26,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:26,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602888362] [2021-05-22 02:22:26,241 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:26,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:26,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:26,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:26,241 INFO L87 Difference]: Start difference. First operand 329 states and 982 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:26,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:26,426 INFO L93 Difference]: Finished difference Result 458 states and 1346 transitions. [2021-05-22 02:22:26,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:26,426 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:26,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:26,427 INFO L225 Difference]: With dead ends: 458 [2021-05-22 02:22:26,427 INFO L226 Difference]: Without dead ends: 443 [2021-05-22 02:22:26,427 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 209.7ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:26,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-05-22 02:22:26,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 325. [2021-05-22 02:22:26,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:26,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:22:26,430 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:22:26,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:26,431 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:22:26,431 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:26,431 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:22:26,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:26,431 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:26,431 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:26,631 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 114 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable356 [2021-05-22 02:22:26,632 INFO L430 AbstractCegarLoop]: === Iteration 126 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:26,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:26,632 INFO L82 PathProgramCache]: Analyzing trace with hash -2051044326, now seen corresponding path program 114 times [2021-05-22 02:22:26,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:26,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842482629] [2021-05-22 02:22:26,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:26,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:26,735 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:26,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:26,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842482629] [2021-05-22 02:22:26,736 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842482629] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:26,736 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159736201] [2021-05-22 02:22:26,736 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:26,761 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:26,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:26,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:26,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:26,805 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:26,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:26,806 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,814 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,815 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:26,815 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:26,900 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:26,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:26,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,910 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:26,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:26,910 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,917 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:26,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:26,918 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:26,943 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:26,944 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159736201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:26,944 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:26,944 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:26,944 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470244211] [2021-05-22 02:22:26,944 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:26,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:26,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:26,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:26,944 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:27,146 INFO L93 Difference]: Finished difference Result 450 states and 1328 transitions. [2021-05-22 02:22:27,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:27,146 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:27,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:27,147 INFO L225 Difference]: With dead ends: 450 [2021-05-22 02:22:27,147 INFO L226 Difference]: Without dead ends: 435 [2021-05-22 02:22:27,147 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 190.1ms TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:27,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2021-05-22 02:22:27,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 335. [2021-05-22 02:22:27,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 2.997005988023952) internal successors, (1001), 334 states have internal predecessors, (1001), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 1001 transitions. [2021-05-22 02:22:27,151 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 1001 transitions. Word has length 20 [2021-05-22 02:22:27,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:27,151 INFO L482 AbstractCegarLoop]: Abstraction has 335 states and 1001 transitions. [2021-05-22 02:22:27,151 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,151 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 1001 transitions. [2021-05-22 02:22:27,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:27,151 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:27,151 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:27,352 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable357,115 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:27,352 INFO L430 AbstractCegarLoop]: === Iteration 127 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:27,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:27,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1742131634, now seen corresponding path program 115 times [2021-05-22 02:22:27,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:27,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203527053] [2021-05-22 02:22:27,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:27,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:27,450 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:27,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:27,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203527053] [2021-05-22 02:22:27,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203527053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:27,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1108721862] [2021-05-22 02:22:27,451 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:27,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:27,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:27,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:27,537 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:27,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:27,538 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:27,546 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:27,547 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:27,547 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:27,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:27,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:27,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:27,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:27,616 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:27,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:27,616 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:27,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:27,625 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:27,625 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:22:27,667 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:27,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1108721862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:27,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:27,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:27,668 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360803952] [2021-05-22 02:22:27,668 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:27,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:27,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:27,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:27,668 INFO L87 Difference]: Start difference. First operand 335 states and 1001 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:27,820 INFO L93 Difference]: Finished difference Result 456 states and 1341 transitions. [2021-05-22 02:22:27,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:27,821 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:27,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:27,821 INFO L225 Difference]: With dead ends: 456 [2021-05-22 02:22:27,821 INFO L226 Difference]: Without dead ends: 441 [2021-05-22 02:22:27,822 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 185.1ms TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:27,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-05-22 02:22:27,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 333. [2021-05-22 02:22:27,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9939759036144578) internal successors, (994), 332 states have internal predecessors, (994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,825 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 994 transitions. [2021-05-22 02:22:27,825 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 994 transitions. Word has length 20 [2021-05-22 02:22:27,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:27,825 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 994 transitions. [2021-05-22 02:22:27,825 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:27,826 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 994 transitions. [2021-05-22 02:22:27,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:27,826 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:27,826 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:28,028 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable362,116 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:28,029 INFO L430 AbstractCegarLoop]: === Iteration 128 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:28,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:28,029 INFO L82 PathProgramCache]: Analyzing trace with hash 210286490, now seen corresponding path program 116 times [2021-05-22 02:22:28,029 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:28,029 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394140877] [2021-05-22 02:22:28,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:28,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:28,145 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:28,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:28,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394140877] [2021-05-22 02:22:28,146 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394140877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:28,146 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977636042] [2021-05-22 02:22:28,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:28,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:28,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:28,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:28,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:28,216 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:28,217 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:28,226 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:28,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:28,282 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,290 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,292 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:28,293 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,302 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,302 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:28,313 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:28,314 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977636042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:28,314 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:28,314 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:28,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912849690] [2021-05-22 02:22:28,314 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:28,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:28,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:28,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:28,315 INFO L87 Difference]: Start difference. First operand 333 states and 994 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:28,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:28,448 INFO L93 Difference]: Finished difference Result 409 states and 1201 transitions. [2021-05-22 02:22:28,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:28,448 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:28,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:28,449 INFO L225 Difference]: With dead ends: 409 [2021-05-22 02:22:28,449 INFO L226 Difference]: Without dead ends: 394 [2021-05-22 02:22:28,449 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 158.4ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:28,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-05-22 02:22:28,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 330. [2021-05-22 02:22:28,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.987841945288754) internal successors, (983), 329 states have internal predecessors, (983), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:28,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 983 transitions. [2021-05-22 02:22:28,453 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 983 transitions. Word has length 20 [2021-05-22 02:22:28,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:28,453 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 983 transitions. [2021-05-22 02:22:28,454 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:28,454 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 983 transitions. [2021-05-22 02:22:28,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:28,454 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:28,454 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:28,656 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable367 [2021-05-22 02:22:28,657 INFO L430 AbstractCegarLoop]: === Iteration 129 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:28,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:28,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1714588368, now seen corresponding path program 117 times [2021-05-22 02:22:28,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:28,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081861343] [2021-05-22 02:22:28,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:28,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:28,747 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:28,748 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:28,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081861343] [2021-05-22 02:22:28,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081861343] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:28,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112389731] [2021-05-22 02:22:28,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:28,780 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:28,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:28,781 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:28,781 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:28,848 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:28,849 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:28,861 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:28,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:28,896 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,910 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:28,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:28,911 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,920 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:28,921 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:28,921 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:22:28,938 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:28,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112389731] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:28,938 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:28,938 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:28,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869015452] [2021-05-22 02:22:28,938 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:28,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:28,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:28,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:28,939 INFO L87 Difference]: Start difference. First operand 330 states and 983 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:29,056 INFO L93 Difference]: Finished difference Result 419 states and 1230 transitions. [2021-05-22 02:22:29,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:29,057 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:29,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:29,057 INFO L225 Difference]: With dead ends: 419 [2021-05-22 02:22:29,057 INFO L226 Difference]: Without dead ends: 404 [2021-05-22 02:22:29,058 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 134.9ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:29,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 404 states. [2021-05-22 02:22:29,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 404 to 329. [2021-05-22 02:22:29,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:22:29,061 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:22:29,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:29,061 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:22:29,061 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,062 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:22:29,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:29,062 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:29,062 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:29,262 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable368,118 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:29,262 INFO L430 AbstractCegarLoop]: === Iteration 130 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:29,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:29,263 INFO L82 PathProgramCache]: Analyzing trace with hash 828548658, now seen corresponding path program 118 times [2021-05-22 02:22:29,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:29,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [134774668] [2021-05-22 02:22:29,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:29,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:29,383 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:29,383 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:29,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [134774668] [2021-05-22 02:22:29,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [134774668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:29,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [870423137] [2021-05-22 02:22:29,384 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:29,412 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:29,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:29,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:29,413 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:29,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:29,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:29,476 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:29,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:29,484 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:29,484 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:22:29,511 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:29,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:29,512 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:29,521 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:29,523 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:29,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:29,523 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:29,531 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:29,532 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:29,532 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:12 [2021-05-22 02:22:29,544 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:29,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [870423137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:29,545 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:29,545 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:29,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434745944] [2021-05-22 02:22:29,545 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:29,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:29,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:29,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:29,545 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:29,650 INFO L93 Difference]: Finished difference Result 398 states and 1173 transitions. [2021-05-22 02:22:29,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:29,650 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:29,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:29,650 INFO L225 Difference]: With dead ends: 398 [2021-05-22 02:22:29,650 INFO L226 Difference]: Without dead ends: 383 [2021-05-22 02:22:29,651 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 161.1ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:29,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2021-05-22 02:22:29,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 326. [2021-05-22 02:22:29,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9846153846153847) internal successors, (970), 325 states have internal predecessors, (970), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 970 transitions. [2021-05-22 02:22:29,654 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 970 transitions. Word has length 20 [2021-05-22 02:22:29,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:29,654 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 970 transitions. [2021-05-22 02:22:29,654 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:29,654 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 970 transitions. [2021-05-22 02:22:29,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:29,655 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:29,655 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:29,855 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 119 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable369 [2021-05-22 02:22:29,855 INFO L430 AbstractCegarLoop]: === Iteration 131 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:29,855 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:29,855 INFO L82 PathProgramCache]: Analyzing trace with hash -890436024, now seen corresponding path program 119 times [2021-05-22 02:22:29,855 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:29,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165117009] [2021-05-22 02:22:29,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:29,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:29,957 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:29,957 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:29,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165117009] [2021-05-22 02:22:29,957 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165117009] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:29,957 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [159203289] [2021-05-22 02:22:29,957 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:29,983 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:29,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:29,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:22:29,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:30,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:30,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,042 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,043 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:30,044 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:22:30,071 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,071 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:30,072 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,075 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:30,076 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,108 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:30,112 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:30,115 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,146 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:30,147 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:101, output treesize:41 [2021-05-22 02:22:30,249 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:30,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [159203289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:30,249 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:30,249 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:30,249 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602046129] [2021-05-22 02:22:30,249 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:30,250 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:30,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:30,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:30,250 INFO L87 Difference]: Start difference. First operand 326 states and 970 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:30,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:30,530 INFO L93 Difference]: Finished difference Result 490 states and 1449 transitions. [2021-05-22 02:22:30,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:22:30,530 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:30,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:30,531 INFO L225 Difference]: With dead ends: 490 [2021-05-22 02:22:30,531 INFO L226 Difference]: Without dead ends: 475 [2021-05-22 02:22:30,531 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 264.1ms TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:22:30,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-05-22 02:22:30,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 325. [2021-05-22 02:22:30,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:30,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:22:30,536 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:22:30,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:30,537 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:22:30,537 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:30,537 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:22:30,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:30,537 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:30,537 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:30,752 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable370,120 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:30,753 INFO L430 AbstractCegarLoop]: === Iteration 132 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:30,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:30,753 INFO L82 PathProgramCache]: Analyzing trace with hash 505951154, now seen corresponding path program 120 times [2021-05-22 02:22:30,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:30,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [461004738] [2021-05-22 02:22:30,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:30,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:30,846 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:30,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:30,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [461004738] [2021-05-22 02:22:30,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [461004738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:30,847 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641883820] [2021-05-22 02:22:30,847 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:30,872 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:30,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:30,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:30,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:30,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:30,915 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,923 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:30,923 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:30,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:30,983 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,989 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,991 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:30,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:30,992 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,997 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:30,998 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:30,998 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:31,011 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:31,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [641883820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:31,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:31,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:31,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127248578] [2021-05-22 02:22:31,011 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:31,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:31,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:31,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:31,012 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:31,213 INFO L93 Difference]: Finished difference Result 393 states and 1159 transitions. [2021-05-22 02:22:31,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:31,214 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:31,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:31,214 INFO L225 Difference]: With dead ends: 393 [2021-05-22 02:22:31,214 INFO L226 Difference]: Without dead ends: 378 [2021-05-22 02:22:31,214 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 137.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:31,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2021-05-22 02:22:31,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 331. [2021-05-22 02:22:31,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.9909090909090907) internal successors, (987), 330 states have internal predecessors, (987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 987 transitions. [2021-05-22 02:22:31,218 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 987 transitions. Word has length 20 [2021-05-22 02:22:31,218 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:31,218 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 987 transitions. [2021-05-22 02:22:31,218 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,218 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 987 transitions. [2021-05-22 02:22:31,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:31,218 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:31,218 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:31,419 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable375,121 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:31,419 INFO L430 AbstractCegarLoop]: === Iteration 133 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:31,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:31,419 INFO L82 PathProgramCache]: Analyzing trace with hash -823977008, now seen corresponding path program 121 times [2021-05-22 02:22:31,419 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:31,419 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969727985] [2021-05-22 02:22:31,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:31,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:31,532 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:31,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:31,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969727985] [2021-05-22 02:22:31,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969727985] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:31,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486777672] [2021-05-22 02:22:31,532 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:31,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:31,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:31,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:31,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:31,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:31,607 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:31,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:31,609 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:31,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:31,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:31,634 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:31,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:31,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:31,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:31,643 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:31,650 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:31,651 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:31,651 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:31,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:31,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486777672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:31,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:31,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:31,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24593798] [2021-05-22 02:22:31,710 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:31,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:31,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:31,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:31,710 INFO L87 Difference]: Start difference. First operand 331 states and 987 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:31,876 INFO L93 Difference]: Finished difference Result 458 states and 1346 transitions. [2021-05-22 02:22:31,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:31,876 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:31,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:31,877 INFO L225 Difference]: With dead ends: 458 [2021-05-22 02:22:31,877 INFO L226 Difference]: Without dead ends: 443 [2021-05-22 02:22:31,877 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 190.7ms TimeCoverageRelationStatistics Valid=66, Invalid=276, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:31,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-05-22 02:22:31,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 328. [2021-05-22 02:22:31,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.981651376146789) internal successors, (975), 327 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,881 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 975 transitions. [2021-05-22 02:22:31,881 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 975 transitions. Word has length 20 [2021-05-22 02:22:31,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:31,881 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 975 transitions. [2021-05-22 02:22:31,881 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:31,881 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 975 transitions. [2021-05-22 02:22:31,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:31,881 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:31,881 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:32,082 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 122 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable380 [2021-05-22 02:22:32,082 INFO L430 AbstractCegarLoop]: === Iteration 134 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:32,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:32,082 INFO L82 PathProgramCache]: Analyzing trace with hash -1739058496, now seen corresponding path program 122 times [2021-05-22 02:22:32,082 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:32,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675630906] [2021-05-22 02:22:32,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:32,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:32,197 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:32,197 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:32,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675630906] [2021-05-22 02:22:32,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675630906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:32,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537587171] [2021-05-22 02:22:32,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:32,228 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:32,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:32,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:32,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:32,268 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:32,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:32,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,275 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:32,275 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,276 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:25 [2021-05-22 02:22:32,295 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:22:32,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:32,297 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,304 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:32,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:32,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:32,307 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,314 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:32,314 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,314 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:22:32,371 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:32,372 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537587171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:32,372 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:32,372 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:32,372 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [610882036] [2021-05-22 02:22:32,372 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:32,372 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:32,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:32,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:32,373 INFO L87 Difference]: Start difference. First operand 328 states and 975 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:32,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:32,531 INFO L93 Difference]: Finished difference Result 450 states and 1327 transitions. [2021-05-22 02:22:32,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:32,532 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:32,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:32,533 INFO L225 Difference]: With dead ends: 450 [2021-05-22 02:22:32,533 INFO L226 Difference]: Without dead ends: 435 [2021-05-22 02:22:32,533 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 189.5ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:32,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 435 states. [2021-05-22 02:22:32,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 435 to 324. [2021-05-22 02:22:32,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 2.981424148606811) internal successors, (963), 323 states have internal predecessors, (963), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:32,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 963 transitions. [2021-05-22 02:22:32,538 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 963 transitions. Word has length 20 [2021-05-22 02:22:32,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:32,538 INFO L482 AbstractCegarLoop]: Abstraction has 324 states and 963 transitions. [2021-05-22 02:22:32,538 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:32,538 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 963 transitions. [2021-05-22 02:22:32,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:32,539 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:32,539 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:32,760 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable381,123 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:32,760 INFO L430 AbstractCegarLoop]: === Iteration 135 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:32,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:32,760 INFO L82 PathProgramCache]: Analyzing trace with hash -146183416, now seen corresponding path program 123 times [2021-05-22 02:22:32,760 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:32,760 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1346480336] [2021-05-22 02:22:32,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:32,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:32,842 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:32,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:32,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1346480336] [2021-05-22 02:22:32,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1346480336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:32,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1979579204] [2021-05-22 02:22:32,843 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:32,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:32,869 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:32,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:32,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:32,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:32,888 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:32,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,892 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:22:32,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:32,932 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,935 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:32,935 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:32,936 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:32,936 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:32,976 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:32,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1979579204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:32,976 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:32,976 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:32,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840827347] [2021-05-22 02:22:32,976 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:32,976 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:32,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:32,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:32,977 INFO L87 Difference]: Start difference. First operand 324 states and 963 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:33,176 INFO L93 Difference]: Finished difference Result 567 states and 1671 transitions. [2021-05-22 02:22:33,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:33,176 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:33,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:33,177 INFO L225 Difference]: With dead ends: 567 [2021-05-22 02:22:33,177 INFO L226 Difference]: Without dead ends: 552 [2021-05-22 02:22:33,177 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 153.9ms TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:22:33,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2021-05-22 02:22:33,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 327. [2021-05-22 02:22:33,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.98159509202454) internal successors, (972), 326 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 972 transitions. [2021-05-22 02:22:33,181 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 972 transitions. Word has length 20 [2021-05-22 02:22:33,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:33,181 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 972 transitions. [2021-05-22 02:22:33,181 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,181 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 972 transitions. [2021-05-22 02:22:33,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:33,182 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:33,182 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:33,382 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable382,124 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:33,383 INFO L430 AbstractCegarLoop]: === Iteration 136 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:33,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:33,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1981568732, now seen corresponding path program 124 times [2021-05-22 02:22:33,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:33,383 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392510749] [2021-05-22 02:22:33,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:33,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:33,477 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:33,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:33,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392510749] [2021-05-22 02:22:33,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392510749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:33,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1365107874] [2021-05-22 02:22:33,477 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:33,503 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:33,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:33,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:33,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:33,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:33,536 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:33,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:33,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:33,541 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:33,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:33,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:33,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:33,575 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:33,575 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:33,576 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:33,588 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:33,589 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1365107874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:33,589 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:33,589 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:33,589 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [250244455] [2021-05-22 02:22:33,589 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:33,589 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:33,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:33,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:33,589 INFO L87 Difference]: Start difference. First operand 327 states and 972 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:33,746 INFO L93 Difference]: Finished difference Result 424 states and 1250 transitions. [2021-05-22 02:22:33,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:33,747 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:33,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:33,747 INFO L225 Difference]: With dead ends: 424 [2021-05-22 02:22:33,747 INFO L226 Difference]: Without dead ends: 409 [2021-05-22 02:22:33,748 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 111.2ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:33,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-05-22 02:22:33,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 333. [2021-05-22 02:22:33,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9909638554216866) internal successors, (993), 332 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 993 transitions. [2021-05-22 02:22:33,751 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 993 transitions. Word has length 20 [2021-05-22 02:22:33,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:33,751 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 993 transitions. [2021-05-22 02:22:33,751 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:33,751 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 993 transitions. [2021-05-22 02:22:33,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:33,752 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:33,752 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:33,952 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable383,125 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:33,952 INFO L430 AbstractCegarLoop]: === Iteration 137 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:33,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:33,953 INFO L82 PathProgramCache]: Analyzing trace with hash 651640570, now seen corresponding path program 125 times [2021-05-22 02:22:33,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:33,953 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894484201] [2021-05-22 02:22:33,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:33,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:34,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:34,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:34,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894484201] [2021-05-22 02:22:34,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894484201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:34,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502616077] [2021-05-22 02:22:34,052 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:34,078 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:34,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:34,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:22:34,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:34,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:34,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:34,113 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:34,132 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:34,132 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:67, output treesize:53 [2021-05-22 02:22:34,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:34,176 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:34,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:34,205 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,230 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:34,230 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:34,230 INFO L518 ElimStorePlain]: Eliminatee v_prenex_10 vanished before elimination [2021-05-22 02:22:34,231 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:34,231 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:71, output treesize:41 [2021-05-22 02:22:34,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:34,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502616077] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:34,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:34,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:34,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257671600] [2021-05-22 02:22:34,347 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:34,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:34,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:34,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:34,348 INFO L87 Difference]: Start difference. First operand 333 states and 993 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:34,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:34,560 INFO L93 Difference]: Finished difference Result 502 states and 1488 transitions. [2021-05-22 02:22:34,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:22:34,560 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:34,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:34,561 INFO L225 Difference]: With dead ends: 502 [2021-05-22 02:22:34,561 INFO L226 Difference]: Without dead ends: 487 [2021-05-22 02:22:34,561 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 262.1ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:34,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-05-22 02:22:34,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 330. [2021-05-22 02:22:34,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9817629179331306) internal successors, (981), 329 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:34,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 981 transitions. [2021-05-22 02:22:34,565 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 981 transitions. Word has length 20 [2021-05-22 02:22:34,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:34,565 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 981 transitions. [2021-05-22 02:22:34,565 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:34,565 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 981 transitions. [2021-05-22 02:22:34,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:34,565 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:34,565 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:34,766 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 126 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable384 [2021-05-22 02:22:34,766 INFO L430 AbstractCegarLoop]: === Iteration 138 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:34,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:34,766 INFO L82 PathProgramCache]: Analyzing trace with hash -263440918, now seen corresponding path program 126 times [2021-05-22 02:22:34,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:34,766 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908969819] [2021-05-22 02:22:34,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:34,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:34,883 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:34,884 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:34,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908969819] [2021-05-22 02:22:34,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908969819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:34,884 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810232915] [2021-05-22 02:22:34,884 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:34,921 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:22:34,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:34,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:34,922 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:34,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:34,959 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,965 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:34,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,966 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:22:34,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:34,989 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:34,995 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:34,996 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:34,996 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:22:35,069 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:35,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810232915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:35,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:35,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:35,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116890323] [2021-05-22 02:22:35,071 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:35,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:35,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:35,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:35,071 INFO L87 Difference]: Start difference. First operand 330 states and 981 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:35,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:35,263 INFO L93 Difference]: Finished difference Result 481 states and 1418 transitions. [2021-05-22 02:22:35,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:35,263 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:35,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:35,264 INFO L225 Difference]: With dead ends: 481 [2021-05-22 02:22:35,265 INFO L226 Difference]: Without dead ends: 466 [2021-05-22 02:22:35,265 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 213.3ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:35,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2021-05-22 02:22:35,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 327. [2021-05-22 02:22:35,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.98159509202454) internal successors, (972), 326 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:35,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 972 transitions. [2021-05-22 02:22:35,270 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 972 transitions. Word has length 20 [2021-05-22 02:22:35,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:35,270 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 972 transitions. [2021-05-22 02:22:35,271 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:35,271 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 972 transitions. [2021-05-22 02:22:35,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:35,271 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:35,271 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:35,494 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable391,127 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:35,495 INFO L430 AbstractCegarLoop]: === Iteration 139 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:35,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:35,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1576469964, now seen corresponding path program 127 times [2021-05-22 02:22:35,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:35,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789378577] [2021-05-22 02:22:35,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:35,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:35,618 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:35,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:35,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789378577] [2021-05-22 02:22:35,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789378577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:35,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649199335] [2021-05-22 02:22:35,618 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:35,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:35,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:35,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:35,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:35,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:35,712 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:35,712 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:35,712 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:23 [2021-05-22 02:22:35,752 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:35,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:35,753 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:35,760 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:35,763 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:35,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:35,764 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:35,770 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:35,771 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:35,771 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:34, output treesize:9 [2021-05-22 02:22:35,807 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:35,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649199335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:35,807 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:35,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:35,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033320932] [2021-05-22 02:22:35,807 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:35,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:35,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:35,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:35,808 INFO L87 Difference]: Start difference. First operand 327 states and 972 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:36,186 INFO L93 Difference]: Finished difference Result 522 states and 1543 transitions. [2021-05-22 02:22:36,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:22:36,186 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:36,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:36,187 INFO L225 Difference]: With dead ends: 522 [2021-05-22 02:22:36,187 INFO L226 Difference]: Without dead ends: 507 [2021-05-22 02:22:36,187 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 366.9ms TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:22:36,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-05-22 02:22:36,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 339. [2021-05-22 02:22:36,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 2.997041420118343) internal successors, (1013), 338 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 1013 transitions. [2021-05-22 02:22:36,191 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 1013 transitions. Word has length 20 [2021-05-22 02:22:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:36,191 INFO L482 AbstractCegarLoop]: Abstraction has 339 states and 1013 transitions. [2021-05-22 02:22:36,191 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,191 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 1013 transitions. [2021-05-22 02:22:36,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:36,192 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:36,192 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:36,392 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 128 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable392 [2021-05-22 02:22:36,392 INFO L430 AbstractCegarLoop]: === Iteration 140 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:36,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:36,393 INFO L82 PathProgramCache]: Analyzing trace with hash -2078261300, now seen corresponding path program 128 times [2021-05-22 02:22:36,393 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:36,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797739841] [2021-05-22 02:22:36,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:36,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:36,491 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:36,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:36,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797739841] [2021-05-22 02:22:36,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797739841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:36,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1988882936] [2021-05-22 02:22:36,492 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:36,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:36,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:36,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:36,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:36,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:36,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:36,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:36,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:36,587 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:23 [2021-05-22 02:22:36,608 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:36,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:36,609 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:36,616 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:36,617 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:36,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:36,618 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:36,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:36,624 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:36,624 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:22:36,666 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:36,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1988882936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:36,667 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:36,667 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:36,667 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430841382] [2021-05-22 02:22:36,667 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:36,667 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:36,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:36,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:36,667 INFO L87 Difference]: Start difference. First operand 339 states and 1013 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:36,987 INFO L93 Difference]: Finished difference Result 528 states and 1556 transitions. [2021-05-22 02:22:36,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:22:36,988 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:36,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:36,988 INFO L225 Difference]: With dead ends: 528 [2021-05-22 02:22:36,988 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:22:36,989 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 307.8ms TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:22:36,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:22:36,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 337. [2021-05-22 02:22:36,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 2.994047619047619) internal successors, (1006), 336 states have internal predecessors, (1006), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 1006 transitions. [2021-05-22 02:22:36,997 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 1006 transitions. Word has length 20 [2021-05-22 02:22:36,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:36,997 INFO L482 AbstractCegarLoop]: Abstraction has 337 states and 1006 transitions. [2021-05-22 02:22:36,997 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:36,997 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 1006 transitions. [2021-05-22 02:22:36,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:36,998 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:36,998 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:37,198 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable393,129 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:37,198 INFO L430 AbstractCegarLoop]: === Iteration 141 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:37,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:37,199 INFO L82 PathProgramCache]: Analyzing trace with hash 109921876, now seen corresponding path program 129 times [2021-05-22 02:22:37,199 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:37,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8273025] [2021-05-22 02:22:37,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:37,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:37,289 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:37,289 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:37,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8273025] [2021-05-22 02:22:37,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8273025] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:37,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379099800] [2021-05-22 02:22:37,289 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:37,321 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:37,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:37,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:37,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:37,383 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:37,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:37,385 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:37,393 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:37,394 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:37,394 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:22:37,419 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:22:37,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:37,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:37,427 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:37,429 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:37,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:37,430 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:37,435 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:37,436 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:37,436 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:22:37,477 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:37,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379099800] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:37,477 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:37,477 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:37,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1822203918] [2021-05-22 02:22:37,478 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:37,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:37,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:37,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:37,478 INFO L87 Difference]: Start difference. First operand 337 states and 1006 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:37,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:37,942 INFO L93 Difference]: Finished difference Result 549 states and 1626 transitions. [2021-05-22 02:22:37,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:22:37,943 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:37,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:37,944 INFO L225 Difference]: With dead ends: 549 [2021-05-22 02:22:37,944 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:22:37,944 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 334.6ms TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:22:37,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:22:37,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 339. [2021-05-22 02:22:37,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 339 states, 338 states have (on average 2.997041420118343) internal successors, (1013), 338 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:37,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 339 states to 339 states and 1013 transitions. [2021-05-22 02:22:37,949 INFO L78 Accepts]: Start accepts. Automaton has 339 states and 1013 transitions. Word has length 20 [2021-05-22 02:22:37,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:37,950 INFO L482 AbstractCegarLoop]: Abstraction has 339 states and 1013 transitions. [2021-05-22 02:22:37,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:37,950 INFO L276 IsEmpty]: Start isEmpty. Operand 339 states and 1013 transitions. [2021-05-22 02:22:37,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:37,950 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:37,950 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:38,164 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable394,130 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:38,165 INFO L430 AbstractCegarLoop]: === Iteration 142 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:38,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:38,165 INFO L82 PathProgramCache]: Analyzing trace with hash 1150157674, now seen corresponding path program 130 times [2021-05-22 02:22:38,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:38,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310795073] [2021-05-22 02:22:38,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:38,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:38,247 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:38,247 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:38,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310795073] [2021-05-22 02:22:38,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310795073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:38,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257177778] [2021-05-22 02:22:38,247 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:38,272 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:38,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:38,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:38,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:38,314 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:38,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:38,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:38,320 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:38,320 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:38,320 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:32, output treesize:25 [2021-05-22 02:22:38,357 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:22:38,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:38,359 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:38,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:38,368 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:38,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:38,369 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:38,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:38,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:38,375 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:37, output treesize:12 [2021-05-22 02:22:38,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:38,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257177778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:38,419 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:38,419 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:38,419 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317147398] [2021-05-22 02:22:38,420 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:38,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:38,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:38,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:38,420 INFO L87 Difference]: Start difference. First operand 339 states and 1013 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:39,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:39,110 INFO L93 Difference]: Finished difference Result 676 states and 2000 transitions. [2021-05-22 02:22:39,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:22:39,110 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:39,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:39,111 INFO L225 Difference]: With dead ends: 676 [2021-05-22 02:22:39,111 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:22:39,111 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 472.1ms TimeCoverageRelationStatistics Valid=163, Invalid=649, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:22:39,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:22:39,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 337. [2021-05-22 02:22:39,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 3.0) internal successors, (1008), 336 states have internal predecessors, (1008), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:39,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 1008 transitions. [2021-05-22 02:22:39,116 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 1008 transitions. Word has length 20 [2021-05-22 02:22:39,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:39,116 INFO L482 AbstractCegarLoop]: Abstraction has 337 states and 1008 transitions. [2021-05-22 02:22:39,116 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:39,116 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 1008 transitions. [2021-05-22 02:22:39,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:39,116 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:39,116 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:39,317 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable395,131 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:39,317 INFO L430 AbstractCegarLoop]: === Iteration 143 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:39,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:39,317 INFO L82 PathProgramCache]: Analyzing trace with hash 585725364, now seen corresponding path program 131 times [2021-05-22 02:22:39,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:39,317 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260616080] [2021-05-22 02:22:39,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:39,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:39,431 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:39,432 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:39,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260616080] [2021-05-22 02:22:39,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260616080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:39,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133642335] [2021-05-22 02:22:39,432 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:39,458 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:39,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:39,458 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:39,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:39,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:39,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:39,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:39,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:39,522 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:39,522 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:39,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:39,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:39,580 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:39,589 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:39,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:39,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:39,592 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:39,600 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:39,601 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:39,601 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:12 [2021-05-22 02:22:39,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:39,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133642335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:39,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:39,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:39,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642179091] [2021-05-22 02:22:39,643 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:39,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:39,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:39,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:39,644 INFO L87 Difference]: Start difference. First operand 337 states and 1008 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:40,032 INFO L93 Difference]: Finished difference Result 537 states and 1582 transitions. [2021-05-22 02:22:40,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:22:40,032 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:40,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:40,033 INFO L225 Difference]: With dead ends: 537 [2021-05-22 02:22:40,033 INFO L226 Difference]: Without dead ends: 522 [2021-05-22 02:22:40,033 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 334.7ms TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:22:40,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-05-22 02:22:40,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 334. [2021-05-22 02:22:40,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 2.993993993993994) internal successors, (997), 333 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 997 transitions. [2021-05-22 02:22:40,037 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 997 transitions. Word has length 20 [2021-05-22 02:22:40,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:40,037 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 997 transitions. [2021-05-22 02:22:40,037 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,037 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 997 transitions. [2021-05-22 02:22:40,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:40,037 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:40,037 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:40,238 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable396,132 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:40,238 INFO L430 AbstractCegarLoop]: === Iteration 144 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:40,238 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:40,238 INFO L82 PathProgramCache]: Analyzing trace with hash 2090027242, now seen corresponding path program 132 times [2021-05-22 02:22:40,238 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:40,238 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698678638] [2021-05-22 02:22:40,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:40,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:40,317 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:40,317 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698678638] [2021-05-22 02:22:40,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698678638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:40,317 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [410596269] [2021-05-22 02:22:40,317 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:40,342 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:22:40,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:40,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:40,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:40,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:40,377 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,381 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:40,382 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,382 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:40,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:40,399 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,403 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:40,403 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:40,404 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,404 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:22:40,421 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:40,421 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [410596269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:40,421 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:40,421 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:22:40,421 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317194814] [2021-05-22 02:22:40,421 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:22:40,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:40,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:22:40,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:22:40,422 INFO L87 Difference]: Start difference. First operand 334 states and 997 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:40,528 INFO L93 Difference]: Finished difference Result 456 states and 1342 transitions. [2021-05-22 02:22:40,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:40,528 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:40,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:40,529 INFO L225 Difference]: With dead ends: 456 [2021-05-22 02:22:40,529 INFO L226 Difference]: Without dead ends: 441 [2021-05-22 02:22:40,529 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 107.6ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:40,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-05-22 02:22:40,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 333. [2021-05-22 02:22:40,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9879518072289155) internal successors, (992), 332 states have internal predecessors, (992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 992 transitions. [2021-05-22 02:22:40,532 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 992 transitions. Word has length 20 [2021-05-22 02:22:40,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:40,533 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 992 transitions. [2021-05-22 02:22:40,533 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:40,533 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 992 transitions. [2021-05-22 02:22:40,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:40,533 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:40,533 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:40,733 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 133 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable397 [2021-05-22 02:22:40,734 INFO L430 AbstractCegarLoop]: === Iteration 145 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:40,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:40,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1730012500, now seen corresponding path program 133 times [2021-05-22 02:22:40,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:40,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172033224] [2021-05-22 02:22:40,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:40,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:40,841 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:40,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:40,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172033224] [2021-05-22 02:22:40,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172033224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:40,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [608346883] [2021-05-22 02:22:40,841 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:40,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:40,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:40,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:40,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:40,909 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,916 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:40,917 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:40,917 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:40,970 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:40,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:40,971 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:40,978 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:40,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:40,979 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,985 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:40,985 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:40,985 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:41,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:41,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [608346883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:41,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:41,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:41,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [990570182] [2021-05-22 02:22:41,029 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:41,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:41,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:41,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:41,029 INFO L87 Difference]: Start difference. First operand 333 states and 992 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:41,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:41,646 INFO L93 Difference]: Finished difference Result 563 states and 1655 transitions. [2021-05-22 02:22:41,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:22:41,646 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:41,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:41,647 INFO L225 Difference]: With dead ends: 563 [2021-05-22 02:22:41,647 INFO L226 Difference]: Without dead ends: 548 [2021-05-22 02:22:41,647 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 360.7ms TimeCoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:22:41,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-05-22 02:22:41,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 336. [2021-05-22 02:22:41,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.997014925373134) internal successors, (1004), 335 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:41,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1004 transitions. [2021-05-22 02:22:41,651 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1004 transitions. Word has length 20 [2021-05-22 02:22:41,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:41,651 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1004 transitions. [2021-05-22 02:22:41,651 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:41,651 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1004 transitions. [2021-05-22 02:22:41,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:41,652 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:41,652 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:41,852 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 134 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable398 [2021-05-22 02:22:41,852 INFO L430 AbstractCegarLoop]: === Iteration 146 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:41,853 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:41,853 INFO L82 PathProgramCache]: Analyzing trace with hash 400084338, now seen corresponding path program 134 times [2021-05-22 02:22:41,853 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:41,853 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136526320] [2021-05-22 02:22:41,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:41,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:41,960 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:41,960 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:41,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136526320] [2021-05-22 02:22:41,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136526320] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:41,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [455092730] [2021-05-22 02:22:41,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 135 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:41,985 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:41,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:41,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:41,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:42,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:42,028 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:42,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:42,036 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:42,058 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:42,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:42,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,066 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:42,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:42,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:42,068 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,075 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:42,075 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,075 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:42,133 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:42,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [455092730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:42,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:42,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:42,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [697440165] [2021-05-22 02:22:42,134 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:42,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:42,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:42,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:42,134 INFO L87 Difference]: Start difference. First operand 336 states and 1004 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:42,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:42,589 INFO L93 Difference]: Finished difference Result 557 states and 1640 transitions. [2021-05-22 02:22:42,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:22:42,590 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:42,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:42,590 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:22:42,590 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:22:42,590 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 360.3ms TimeCoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:22:42,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:22:42,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 332. [2021-05-22 02:22:42,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.984894259818731) internal successors, (988), 331 states have internal predecessors, (988), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:42,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 988 transitions. [2021-05-22 02:22:42,596 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 988 transitions. Word has length 20 [2021-05-22 02:22:42,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:42,596 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 988 transitions. [2021-05-22 02:22:42,596 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:42,596 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 988 transitions. [2021-05-22 02:22:42,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:42,597 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:42,597 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:42,812 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable403,135 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:42,813 INFO L430 AbstractCegarLoop]: === Iteration 147 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:42,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:42,813 INFO L82 PathProgramCache]: Analyzing trace with hash 450882824, now seen corresponding path program 135 times [2021-05-22 02:22:42,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:42,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [299859525] [2021-05-22 02:22:42,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:42,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:42,896 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:42,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:42,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [299859525] [2021-05-22 02:22:42,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [299859525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:42,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569080461] [2021-05-22 02:22:42,897 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 136 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:42,922 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:42,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:42,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:42,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:42,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:42,956 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,961 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:42,962 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:42,962 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:22:43,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:43,003 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,006 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:43,006 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:43,006 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,007 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:43,051 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:43,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569080461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:43,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:43,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:43,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294151433] [2021-05-22 02:22:43,051 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:43,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:43,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:43,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:43,052 INFO L87 Difference]: Start difference. First operand 332 states and 988 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:43,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:43,432 INFO L93 Difference]: Finished difference Result 653 states and 1917 transitions. [2021-05-22 02:22:43,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:22:43,432 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:43,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:43,433 INFO L225 Difference]: With dead ends: 653 [2021-05-22 02:22:43,433 INFO L226 Difference]: Without dead ends: 638 [2021-05-22 02:22:43,433 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 150 ImplicationChecksByTransitivity, 362.7ms TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:22:43,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-05-22 02:22:43,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 331. [2021-05-22 02:22:43,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.981818181818182) internal successors, (984), 330 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:43,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 984 transitions. [2021-05-22 02:22:43,438 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 984 transitions. Word has length 20 [2021-05-22 02:22:43,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:43,438 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 984 transitions. [2021-05-22 02:22:43,438 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:43,438 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 984 transitions. [2021-05-22 02:22:43,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:43,438 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:43,438 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:43,639 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 136 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable404 [2021-05-22 02:22:43,639 INFO L430 AbstractCegarLoop]: === Iteration 148 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:43,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:43,639 INFO L82 PathProgramCache]: Analyzing trace with hash -40662816, now seen corresponding path program 136 times [2021-05-22 02:22:43,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:43,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940236266] [2021-05-22 02:22:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:43,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:43,789 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:43,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:43,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940236266] [2021-05-22 02:22:43,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940236266] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:43,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410668022] [2021-05-22 02:22:43,790 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 137 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:43,817 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:43,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:43,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:43,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:43,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:43,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:43,895 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,902 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:43,903 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:43,903 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:43,965 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:43,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:43,966 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,974 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:43,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:43,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:43,976 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:43,984 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:43,984 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:9 [2021-05-22 02:22:44,011 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:44,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410668022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:44,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:44,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:44,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929489715] [2021-05-22 02:22:44,011 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:44,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:44,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:44,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:44,012 INFO L87 Difference]: Start difference. First operand 331 states and 984 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:44,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:44,255 INFO L93 Difference]: Finished difference Result 489 states and 1444 transitions. [2021-05-22 02:22:44,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:44,255 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:44,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:44,256 INFO L225 Difference]: With dead ends: 489 [2021-05-22 02:22:44,256 INFO L226 Difference]: Without dead ends: 474 [2021-05-22 02:22:44,256 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 307.1ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:22:44,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2021-05-22 02:22:44,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 333. [2021-05-22 02:22:44,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9849397590361444) internal successors, (991), 332 states have internal predecessors, (991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:44,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 991 transitions. [2021-05-22 02:22:44,261 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 991 transitions. Word has length 20 [2021-05-22 02:22:44,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:44,261 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 991 transitions. [2021-05-22 02:22:44,261 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:44,261 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 991 transitions. [2021-05-22 02:22:44,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:44,262 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:44,262 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:44,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable405,137 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:44,473 INFO L430 AbstractCegarLoop]: === Iteration 149 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:44,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:44,473 INFO L82 PathProgramCache]: Analyzing trace with hash -542454152, now seen corresponding path program 137 times [2021-05-22 02:22:44,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:44,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308323449] [2021-05-22 02:22:44,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:44,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:44,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:44,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:44,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308323449] [2021-05-22 02:22:44,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308323449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:44,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579756832] [2021-05-22 02:22:44,602 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 138 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:44,628 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:44,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:44,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:44,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:44,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:44,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:44,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:44,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:44,715 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:44,715 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:44,741 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:44,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:44,743 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:44,751 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:44,754 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:44,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:44,755 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:44,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:44,763 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:44,764 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:44,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:44,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579756832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:44,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:44,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:44,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078741593] [2021-05-22 02:22:44,808 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:44,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:44,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:44,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:44,809 INFO L87 Difference]: Start difference. First operand 333 states and 991 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:45,099 INFO L93 Difference]: Finished difference Result 495 states and 1457 transitions. [2021-05-22 02:22:45,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:45,100 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:45,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:45,100 INFO L225 Difference]: With dead ends: 495 [2021-05-22 02:22:45,101 INFO L226 Difference]: Without dead ends: 480 [2021-05-22 02:22:45,101 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 288.7ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:22:45,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2021-05-22 02:22:45,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 329. [2021-05-22 02:22:45,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.9847560975609757) internal successors, (979), 328 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 979 transitions. [2021-05-22 02:22:45,105 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 979 transitions. Word has length 20 [2021-05-22 02:22:45,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:45,105 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 979 transitions. [2021-05-22 02:22:45,105 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,105 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 979 transitions. [2021-05-22 02:22:45,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:45,105 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:45,105 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:45,305 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 138 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable410 [2021-05-22 02:22:45,306 INFO L430 AbstractCegarLoop]: === Iteration 150 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:45,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:45,306 INFO L82 PathProgramCache]: Analyzing trace with hash 1681237122, now seen corresponding path program 138 times [2021-05-22 02:22:45,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:45,306 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858390632] [2021-05-22 02:22:45,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:45,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:45,425 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:45,425 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:45,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858390632] [2021-05-22 02:22:45,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858390632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:45,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [883486222] [2021-05-22 02:22:45,426 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 139 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:45,452 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:22:45,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:45,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:45,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:45,501 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:45,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:45,502 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:45,510 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:45,511 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:45,511 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:45,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:45,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:45,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:45,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:45,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:45,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:45,608 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:45,615 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:45,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:45,615 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:9 [2021-05-22 02:22:45,624 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:45,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [883486222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:45,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:45,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:22:45,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [860969467] [2021-05-22 02:22:45,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:22:45,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:45,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:22:45,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:45,624 INFO L87 Difference]: Start difference. First operand 329 states and 979 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:45,776 INFO L93 Difference]: Finished difference Result 418 states and 1225 transitions. [2021-05-22 02:22:45,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:45,776 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:45,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:45,777 INFO L225 Difference]: With dead ends: 418 [2021-05-22 02:22:45,777 INFO L226 Difference]: Without dead ends: 403 [2021-05-22 02:22:45,777 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 178.6ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:22:45,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-05-22 02:22:45,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 335. [2021-05-22 02:22:45,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 3.0) internal successors, (1002), 334 states have internal predecessors, (1002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 1002 transitions. [2021-05-22 02:22:45,780 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 1002 transitions. Word has length 20 [2021-05-22 02:22:45,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:45,781 INFO L482 AbstractCegarLoop]: Abstraction has 335 states and 1002 transitions. [2021-05-22 02:22:45,781 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:45,781 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 1002 transitions. [2021-05-22 02:22:45,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:45,781 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:45,781 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:45,981 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 139 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable415 [2021-05-22 02:22:45,982 INFO L430 AbstractCegarLoop]: === Iteration 151 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:45,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:45,982 INFO L82 PathProgramCache]: Analyzing trace with hash 1179445786, now seen corresponding path program 139 times [2021-05-22 02:22:45,982 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:45,982 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936757650] [2021-05-22 02:22:45,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:45,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:46,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:46,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:46,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936757650] [2021-05-22 02:22:46,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1936757650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:46,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927357314] [2021-05-22 02:22:46,088 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 140 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:46,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:46,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:46,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:46,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:46,163 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,171 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:46,172 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:46,172 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:46,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:46,232 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:46,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:46,243 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:46,252 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,252 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:46,265 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:46,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927357314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:46,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:46,265 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:46,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513349720] [2021-05-22 02:22:46,266 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:46,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:46,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:46,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:46,266 INFO L87 Difference]: Start difference. First operand 335 states and 1002 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:46,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:46,433 INFO L93 Difference]: Finished difference Result 412 states and 1212 transitions. [2021-05-22 02:22:46,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:46,433 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:46,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:46,434 INFO L225 Difference]: With dead ends: 412 [2021-05-22 02:22:46,434 INFO L226 Difference]: Without dead ends: 397 [2021-05-22 02:22:46,434 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 152.7ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:46,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 397 states. [2021-05-22 02:22:46,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 397 to 333. [2021-05-22 02:22:46,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.996987951807229) internal successors, (995), 332 states have internal predecessors, (995), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:46,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 995 transitions. [2021-05-22 02:22:46,437 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 995 transitions. Word has length 20 [2021-05-22 02:22:46,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:46,437 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 995 transitions. [2021-05-22 02:22:46,438 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:46,438 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 995 transitions. [2021-05-22 02:22:46,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:46,438 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:46,438 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:46,640 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 140 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable420 [2021-05-22 02:22:46,640 INFO L430 AbstractCegarLoop]: === Iteration 152 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:46,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:46,641 INFO L82 PathProgramCache]: Analyzing trace with hash -352399358, now seen corresponding path program 140 times [2021-05-22 02:22:46,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:46,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432672959] [2021-05-22 02:22:46,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:46,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:46,792 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:46,792 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:46,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432672959] [2021-05-22 02:22:46,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432672959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:46,793 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1104760670] [2021-05-22 02:22:46,793 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 141 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:46,824 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:46,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:46,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:46,825 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:46,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:46,887 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,898 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:46,899 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:46,899 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:22:46,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:46,975 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:46,986 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:46,988 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:46,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:46,989 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:47,001 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,001 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:15 [2021-05-22 02:22:47,060 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:47,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1104760670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:47,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:47,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:47,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [477280750] [2021-05-22 02:22:47,061 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:47,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:47,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:47,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:47,062 INFO L87 Difference]: Start difference. First operand 333 states and 995 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:47,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:47,416 INFO L93 Difference]: Finished difference Result 501 states and 1474 transitions. [2021-05-22 02:22:47,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:47,417 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:47,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:47,421 INFO L225 Difference]: With dead ends: 501 [2021-05-22 02:22:47,421 INFO L226 Difference]: Without dead ends: 486 [2021-05-22 02:22:47,421 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 344.0ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:22:47,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-05-22 02:22:47,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 330. [2021-05-22 02:22:47,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9908814589665655) internal successors, (984), 329 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:47,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 984 transitions. [2021-05-22 02:22:47,425 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 984 transitions. Word has length 20 [2021-05-22 02:22:47,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:47,425 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 984 transitions. [2021-05-22 02:22:47,425 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:47,425 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 984 transitions. [2021-05-22 02:22:47,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:47,426 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:47,426 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:47,626 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable425,141 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:47,626 INFO L430 AbstractCegarLoop]: === Iteration 153 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:47,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:47,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1151902520, now seen corresponding path program 141 times [2021-05-22 02:22:47,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:47,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894664667] [2021-05-22 02:22:47,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:47,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:47,750 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:47,751 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:47,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894664667] [2021-05-22 02:22:47,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894664667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:47,751 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894897040] [2021-05-22 02:22:47,751 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 142 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:47,776 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:22:47,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:47,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:47,777 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:47,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:47,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:47,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,824 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:47,824 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,824 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:22:47,844 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:22:47,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:47,846 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,853 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:47,855 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:47,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:47,856 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,863 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:47,863 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:47,863 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:47,922 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:47,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894897040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:47,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:47,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:47,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78582575] [2021-05-22 02:22:47,923 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:47,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:47,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:47,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:47,923 INFO L87 Difference]: Start difference. First operand 330 states and 984 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:48,171 INFO L93 Difference]: Finished difference Result 507 states and 1491 transitions. [2021-05-22 02:22:48,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:22:48,171 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:48,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:48,172 INFO L225 Difference]: With dead ends: 507 [2021-05-22 02:22:48,172 INFO L226 Difference]: Without dead ends: 492 [2021-05-22 02:22:48,172 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 224.3ms TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:48,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-05-22 02:22:48,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 329. [2021-05-22 02:22:48,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.9847560975609757) internal successors, (979), 328 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 979 transitions. [2021-05-22 02:22:48,176 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 979 transitions. Word has length 20 [2021-05-22 02:22:48,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:48,176 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 979 transitions. [2021-05-22 02:22:48,176 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,176 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 979 transitions. [2021-05-22 02:22:48,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:48,176 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:48,176 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:48,377 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 142 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable426 [2021-05-22 02:22:48,377 INFO L430 AbstractCegarLoop]: === Iteration 154 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:48,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:48,377 INFO L82 PathProgramCache]: Analyzing trace with hash 791887778, now seen corresponding path program 142 times [2021-05-22 02:22:48,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:48,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582244572] [2021-05-22 02:22:48,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:48,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:48,492 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:48,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:48,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582244572] [2021-05-22 02:22:48,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582244572] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:48,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209744190] [2021-05-22 02:22:48,492 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 143 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:48,535 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:48,535 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:48,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:48,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:48,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:48,591 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:48,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:48,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:48,602 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:48,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:48,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:48,675 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:48,683 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:48,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:48,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:48,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:48,695 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:48,696 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:48,696 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:48,712 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:48,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209744190] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:48,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:48,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:48,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510895956] [2021-05-22 02:22:48,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:48,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:48,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:48,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:48,713 INFO L87 Difference]: Start difference. First operand 329 states and 979 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:48,910 INFO L93 Difference]: Finished difference Result 413 states and 1211 transitions. [2021-05-22 02:22:48,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:48,911 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:48,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:48,911 INFO L225 Difference]: With dead ends: 413 [2021-05-22 02:22:48,911 INFO L226 Difference]: Without dead ends: 398 [2021-05-22 02:22:48,911 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 176.3ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:48,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-05-22 02:22:48,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 332. [2021-05-22 02:22:48,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.9939577039274923) internal successors, (991), 331 states have internal predecessors, (991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 991 transitions. [2021-05-22 02:22:48,915 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 991 transitions. Word has length 20 [2021-05-22 02:22:48,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:48,915 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 991 transitions. [2021-05-22 02:22:48,915 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:48,915 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 991 transitions. [2021-05-22 02:22:48,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:48,915 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:48,915 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:49,116 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 143 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable427 [2021-05-22 02:22:49,116 INFO L430 AbstractCegarLoop]: === Iteration 155 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:49,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:49,116 INFO L82 PathProgramCache]: Analyzing trace with hash -538040384, now seen corresponding path program 143 times [2021-05-22 02:22:49,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:49,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677257574] [2021-05-22 02:22:49,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:49,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:49,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:49,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:49,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677257574] [2021-05-22 02:22:49,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677257574] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:49,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711795787] [2021-05-22 02:22:49,221 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 144 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:49,247 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:49,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:49,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:49,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:49,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:49,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:49,297 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:49,298 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:49,298 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:49,322 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:49,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:49,323 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:49,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:49,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:49,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:49,333 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:49,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:49,340 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:49,340 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:49,358 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:49,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711795787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:49,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:49,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:49,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412611787] [2021-05-22 02:22:49,358 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:49,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:49,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:49,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:49,359 INFO L87 Difference]: Start difference. First operand 332 states and 991 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:49,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:49,505 INFO L93 Difference]: Finished difference Result 407 states and 1196 transitions. [2021-05-22 02:22:49,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:49,505 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:49,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:49,506 INFO L225 Difference]: With dead ends: 407 [2021-05-22 02:22:49,506 INFO L226 Difference]: Without dead ends: 392 [2021-05-22 02:22:49,506 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 135.7ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:49,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-22 02:22:49,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 328. [2021-05-22 02:22:49,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.981651376146789) internal successors, (975), 327 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:49,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 975 transitions. [2021-05-22 02:22:49,509 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 975 transitions. Word has length 20 [2021-05-22 02:22:49,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:49,509 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 975 transitions. [2021-05-22 02:22:49,510 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:49,510 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 975 transitions. [2021-05-22 02:22:49,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:49,510 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:49,510 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:49,724 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 144 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable432 [2021-05-22 02:22:49,725 INFO L430 AbstractCegarLoop]: === Iteration 156 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:49,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:49,725 INFO L82 PathProgramCache]: Analyzing trace with hash -916485230, now seen corresponding path program 144 times [2021-05-22 02:22:49,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:49,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114509741] [2021-05-22 02:22:49,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:49,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:49,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:49,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:49,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114509741] [2021-05-22 02:22:49,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114509741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:49,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079113694] [2021-05-22 02:22:49,839 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 145 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:49,865 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:49,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:49,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:49,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:49,909 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:49,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:49,911 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:49,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:49,920 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:49,920 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:50,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:50,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:50,032 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,040 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:50,041 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:50,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:50,042 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:50,050 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,051 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:50,078 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:50,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079113694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:50,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:50,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:50,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885072525] [2021-05-22 02:22:50,078 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:50,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:50,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:50,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:50,079 INFO L87 Difference]: Start difference. First operand 328 states and 975 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:50,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:50,306 INFO L93 Difference]: Finished difference Result 486 states and 1435 transitions. [2021-05-22 02:22:50,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:22:50,306 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:50,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:50,307 INFO L225 Difference]: With dead ends: 486 [2021-05-22 02:22:50,307 INFO L226 Difference]: Without dead ends: 471 [2021-05-22 02:22:50,307 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 220.4ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:50,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2021-05-22 02:22:50,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 338. [2021-05-22 02:22:50,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 2.9970326409495547) internal successors, (1010), 337 states have internal predecessors, (1010), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:50,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 1010 transitions. [2021-05-22 02:22:50,311 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 1010 transitions. Word has length 20 [2021-05-22 02:22:50,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:50,311 INFO L482 AbstractCegarLoop]: Abstraction has 338 states and 1010 transitions. [2021-05-22 02:22:50,311 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:50,311 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 1010 transitions. [2021-05-22 02:22:50,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:50,311 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:50,311 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:50,512 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 145 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable433 [2021-05-22 02:22:50,512 INFO L430 AbstractCegarLoop]: === Iteration 157 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:50,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:50,512 INFO L82 PathProgramCache]: Analyzing trace with hash -1418276566, now seen corresponding path program 145 times [2021-05-22 02:22:50,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:50,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669969410] [2021-05-22 02:22:50,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:50,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:50,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:50,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669969410] [2021-05-22 02:22:50,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669969410] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:50,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1645882147] [2021-05-22 02:22:50,616 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 146 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:50,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:50,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:50,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:50,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:50,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:50,686 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:50,700 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:50,700 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:50,778 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:50,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:50,779 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,790 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:50,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:50,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:50,794 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,804 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:50,806 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:50,806 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:22:50,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:50,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1645882147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:50,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:50,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:50,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [434486392] [2021-05-22 02:22:50,866 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:50,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:50,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:50,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:50,866 INFO L87 Difference]: Start difference. First operand 338 states and 1010 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:51,069 INFO L93 Difference]: Finished difference Result 457 states and 1345 transitions. [2021-05-22 02:22:51,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:51,070 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:51,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:51,070 INFO L225 Difference]: With dead ends: 457 [2021-05-22 02:22:51,070 INFO L226 Difference]: Without dead ends: 442 [2021-05-22 02:22:51,071 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 219.3ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:51,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 442 states. [2021-05-22 02:22:51,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 442 to 336. [2021-05-22 02:22:51,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.994029850746269) internal successors, (1003), 335 states have internal predecessors, (1003), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1003 transitions. [2021-05-22 02:22:51,076 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1003 transitions. Word has length 20 [2021-05-22 02:22:51,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:51,076 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1003 transitions. [2021-05-22 02:22:51,076 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,076 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1003 transitions. [2021-05-22 02:22:51,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:51,077 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:51,077 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:51,277 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable438,146 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:51,277 INFO L430 AbstractCegarLoop]: === Iteration 158 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:51,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:51,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1344845586, now seen corresponding path program 146 times [2021-05-22 02:22:51,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:51,277 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899816881] [2021-05-22 02:22:51,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:51,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:51,366 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:51,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:51,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899816881] [2021-05-22 02:22:51,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899816881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:51,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893504032] [2021-05-22 02:22:51,367 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 147 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:51,392 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:51,392 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:51,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:51,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:51,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:51,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:51,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:51,446 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:51,447 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:51,447 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:51,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:51,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:51,506 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:51,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:51,516 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:51,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:51,517 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:51,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:51,526 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:51,526 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:22:51,540 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:51,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893504032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:51,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:51,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:51,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49775864] [2021-05-22 02:22:51,541 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:51,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:51,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:51,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:51,541 INFO L87 Difference]: Start difference. First operand 336 states and 1003 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:51,719 INFO L93 Difference]: Finished difference Result 411 states and 1208 transitions. [2021-05-22 02:22:51,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:51,719 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:51,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:51,720 INFO L225 Difference]: With dead ends: 411 [2021-05-22 02:22:51,720 INFO L226 Difference]: Without dead ends: 396 [2021-05-22 02:22:51,720 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 139.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:51,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 396 states. [2021-05-22 02:22:51,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 396 to 333. [2021-05-22 02:22:51,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9879518072289155) internal successors, (992), 332 states have internal predecessors, (992), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 992 transitions. [2021-05-22 02:22:51,723 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 992 transitions. Word has length 20 [2021-05-22 02:22:51,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:51,723 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 992 transitions. [2021-05-22 02:22:51,723 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:51,724 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 992 transitions. [2021-05-22 02:22:51,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:51,724 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:51,724 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:51,924 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 147 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable443 [2021-05-22 02:22:51,924 INFO L430 AbstractCegarLoop]: === Iteration 159 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:51,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:51,925 INFO L82 PathProgramCache]: Analyzing trace with hash -1445819832, now seen corresponding path program 147 times [2021-05-22 02:22:51,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:51,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580991221] [2021-05-22 02:22:51,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:51,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:52,031 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:52,032 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:52,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580991221] [2021-05-22 02:22:52,032 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580991221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:52,032 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151462808] [2021-05-22 02:22:52,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 148 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:52,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:52,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:52,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:52,058 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:52,102 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:52,103 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,111 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,112 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:52,112 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:22:52,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:52,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:52,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,165 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,165 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:22:52,229 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:52,230 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151462808] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:52,230 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:52,230 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:52,230 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1979446281] [2021-05-22 02:22:52,230 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:52,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:52,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:52,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:52,230 INFO L87 Difference]: Start difference. First operand 333 states and 992 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:52,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:52,465 INFO L93 Difference]: Finished difference Result 473 states and 1391 transitions. [2021-05-22 02:22:52,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:52,465 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:52,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:52,466 INFO L225 Difference]: With dead ends: 473 [2021-05-22 02:22:52,466 INFO L226 Difference]: Without dead ends: 458 [2021-05-22 02:22:52,466 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 198.1ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:52,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2021-05-22 02:22:52,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 332. [2021-05-22 02:22:52,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.9818731117824773) internal successors, (987), 331 states have internal predecessors, (987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:52,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 987 transitions. [2021-05-22 02:22:52,469 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 987 transitions. Word has length 20 [2021-05-22 02:22:52,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:52,469 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 987 transitions. [2021-05-22 02:22:52,469 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:52,469 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 987 transitions. [2021-05-22 02:22:52,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:52,470 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:52,470 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:52,670 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 148 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable444 [2021-05-22 02:22:52,670 INFO L430 AbstractCegarLoop]: === Iteration 160 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:52,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:52,671 INFO L82 PathProgramCache]: Analyzing trace with hash 1963107754, now seen corresponding path program 148 times [2021-05-22 02:22:52,671 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:52,671 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612098961] [2021-05-22 02:22:52,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:52,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:52,764 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:52,764 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:52,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612098961] [2021-05-22 02:22:52,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612098961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:52,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408288087] [2021-05-22 02:22:52,764 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 149 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:52,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:52,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:52,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:52,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:52,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:52,852 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,860 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:52,860 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:22:52,886 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:52,887 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,897 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:52,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:52,898 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,906 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:52,907 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:52,907 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:42, output treesize:12 [2021-05-22 02:22:52,919 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:52,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408288087] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:52,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:52,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:52,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609241146] [2021-05-22 02:22:52,919 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:52,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:52,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:52,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:52,919 INFO L87 Difference]: Start difference. First operand 332 states and 987 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:53,026 INFO L93 Difference]: Finished difference Result 400 states and 1180 transitions. [2021-05-22 02:22:53,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:53,026 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:53,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:53,027 INFO L225 Difference]: With dead ends: 400 [2021-05-22 02:22:53,027 INFO L226 Difference]: Without dead ends: 385 [2021-05-22 02:22:53,027 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 137.2ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:53,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 385 states. [2021-05-22 02:22:53,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 385 to 329. [2021-05-22 02:22:53,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.9847560975609757) internal successors, (979), 328 states have internal predecessors, (979), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 979 transitions. [2021-05-22 02:22:53,031 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 979 transitions. Word has length 20 [2021-05-22 02:22:53,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:53,031 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 979 transitions. [2021-05-22 02:22:53,032 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,032 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 979 transitions. [2021-05-22 02:22:53,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:53,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:53,032 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:53,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 149 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable445 [2021-05-22 02:22:53,232 INFO L430 AbstractCegarLoop]: === Iteration 161 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:53,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:53,233 INFO L82 PathProgramCache]: Analyzing trace with hash 244123072, now seen corresponding path program 149 times [2021-05-22 02:22:53,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:53,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1918052798] [2021-05-22 02:22:53,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:53,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:53,327 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:53,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:53,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1918052798] [2021-05-22 02:22:53,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1918052798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:53,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366725390] [2021-05-22 02:22:53,327 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 150 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:53,353 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:53,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:53,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:22:53,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:53,397 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:53,398 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:53,406 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:53,407 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:53,407 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:22:53,434 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,435 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:53,436 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:53,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:53,439 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:53,471 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:53,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:53,475 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:53,478 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:53,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:53,478 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:53,509 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:53,511 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:22:53,511 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:101, output treesize:41 [2021-05-22 02:22:53,613 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:53,613 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366725390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:53,613 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:53,613 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:53,613 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893682993] [2021-05-22 02:22:53,613 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:53,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:53,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:53,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:53,613 INFO L87 Difference]: Start difference. First operand 329 states and 979 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:53,831 INFO L93 Difference]: Finished difference Result 426 states and 1248 transitions. [2021-05-22 02:22:53,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:22:53,831 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:53,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:53,832 INFO L225 Difference]: With dead ends: 426 [2021-05-22 02:22:53,832 INFO L226 Difference]: Without dead ends: 411 [2021-05-22 02:22:53,832 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 244.1ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:53,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 411 states. [2021-05-22 02:22:53,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 411 to 328. [2021-05-22 02:22:53,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.981651376146789) internal successors, (975), 327 states have internal predecessors, (975), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 975 transitions. [2021-05-22 02:22:53,837 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 975 transitions. Word has length 20 [2021-05-22 02:22:53,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:53,837 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 975 transitions. [2021-05-22 02:22:53,837 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:53,837 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 975 transitions. [2021-05-22 02:22:53,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:53,838 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:53,838 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:54,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 150 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable446 [2021-05-22 02:22:54,060 INFO L430 AbstractCegarLoop]: === Iteration 162 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:54,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:54,060 INFO L82 PathProgramCache]: Analyzing trace with hash 1640510250, now seen corresponding path program 150 times [2021-05-22 02:22:54,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:54,060 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107383517] [2021-05-22 02:22:54,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:54,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:54,173 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:54,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:54,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107383517] [2021-05-22 02:22:54,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107383517] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:54,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1135168809] [2021-05-22 02:22:54,173 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 151 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:54,206 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:22:54,206 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:54,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:54,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:54,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:54,248 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:54,256 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:54,309 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:54,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:54,310 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,316 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:54,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:54,319 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,325 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,325 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:22:54,338 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:54,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1135168809] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:54,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:54,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:22:54,338 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026954717] [2021-05-22 02:22:54,338 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:22:54,338 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:54,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:22:54,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:54,339 INFO L87 Difference]: Start difference. First operand 328 states and 975 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:54,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:54,517 INFO L93 Difference]: Finished difference Result 395 states and 1166 transitions. [2021-05-22 02:22:54,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:54,517 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:54,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:54,517 INFO L225 Difference]: With dead ends: 395 [2021-05-22 02:22:54,517 INFO L226 Difference]: Without dead ends: 380 [2021-05-22 02:22:54,518 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 154.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:22:54,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2021-05-22 02:22:54,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 334. [2021-05-22 02:22:54,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 2.990990990990991) internal successors, (996), 333 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:54,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 996 transitions. [2021-05-22 02:22:54,521 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 996 transitions. Word has length 20 [2021-05-22 02:22:54,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:54,521 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 996 transitions. [2021-05-22 02:22:54,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:54,521 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 996 transitions. [2021-05-22 02:22:54,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:54,522 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:54,522 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:54,722 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable451,151 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:54,722 INFO L430 AbstractCegarLoop]: === Iteration 163 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:54,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:54,722 INFO L82 PathProgramCache]: Analyzing trace with hash 310582088, now seen corresponding path program 151 times [2021-05-22 02:22:54,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:54,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1009363215] [2021-05-22 02:22:54,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:54,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:54,833 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:54,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:54,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1009363215] [2021-05-22 02:22:54,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1009363215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:54,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52030552] [2021-05-22 02:22:54,833 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 152 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:54,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:54,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:54,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:54,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:54,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:54,909 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:22:54,933 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:54,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:54,934 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,942 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:54,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:54,944 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,951 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:54,952 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:54,952 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:40, output treesize:15 [2021-05-22 02:22:55,012 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:55,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52030552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:55,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:55,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:55,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528868171] [2021-05-22 02:22:55,012 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:55,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:55,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:55,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:55,013 INFO L87 Difference]: Start difference. First operand 334 states and 996 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:55,215 INFO L93 Difference]: Finished difference Result 459 states and 1350 transitions. [2021-05-22 02:22:55,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:55,215 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:55,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:55,216 INFO L225 Difference]: With dead ends: 459 [2021-05-22 02:22:55,216 INFO L226 Difference]: Without dead ends: 444 [2021-05-22 02:22:55,216 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 197.5ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:55,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-05-22 02:22:55,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 331. [2021-05-22 02:22:55,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.981818181818182) internal successors, (984), 330 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 984 transitions. [2021-05-22 02:22:55,219 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 984 transitions. Word has length 20 [2021-05-22 02:22:55,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:55,219 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 984 transitions. [2021-05-22 02:22:55,219 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,219 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 984 transitions. [2021-05-22 02:22:55,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:55,220 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:55,220 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:55,420 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 152 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable456 [2021-05-22 02:22:55,420 INFO L430 AbstractCegarLoop]: === Iteration 164 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:55,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:55,421 INFO L82 PathProgramCache]: Analyzing trace with hash -604499400, now seen corresponding path program 152 times [2021-05-22 02:22:55,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:55,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370960216] [2021-05-22 02:22:55,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:55,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:55,537 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:55,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:55,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370960216] [2021-05-22 02:22:55,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370960216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:55,537 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820588045] [2021-05-22 02:22:55,537 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 153 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:55,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:55,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:55,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:55,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:55,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:55,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:55,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:55,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:55,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:55,615 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:25 [2021-05-22 02:22:55,640 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:22:55,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:55,643 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:55,651 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:55,653 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:55,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:55,653 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:55,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:55,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:55,661 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:22:55,726 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:55,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820588045] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:55,727 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:55,727 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:55,727 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206704219] [2021-05-22 02:22:55,727 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:55,727 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:55,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:55,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:55,727 INFO L87 Difference]: Start difference. First operand 331 states and 984 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:55,895 INFO L93 Difference]: Finished difference Result 451 states and 1331 transitions. [2021-05-22 02:22:55,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:55,895 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:55,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:55,896 INFO L225 Difference]: With dead ends: 451 [2021-05-22 02:22:55,896 INFO L226 Difference]: Without dead ends: 436 [2021-05-22 02:22:55,896 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 200.5ms TimeCoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:55,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-05-22 02:22:55,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 327. [2021-05-22 02:22:55,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.98159509202454) internal successors, (972), 326 states have internal predecessors, (972), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 972 transitions. [2021-05-22 02:22:55,900 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 972 transitions. Word has length 20 [2021-05-22 02:22:55,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:55,900 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 972 transitions. [2021-05-22 02:22:55,900 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:55,900 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 972 transitions. [2021-05-22 02:22:55,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:55,900 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:55,900 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:56,100 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable457,153 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:56,101 INFO L430 AbstractCegarLoop]: === Iteration 165 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:56,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:56,101 INFO L82 PathProgramCache]: Analyzing trace with hash 988375680, now seen corresponding path program 153 times [2021-05-22 02:22:56,101 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:56,101 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678887593] [2021-05-22 02:22:56,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:56,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:56,207 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:56,207 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:56,207 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678887593] [2021-05-22 02:22:56,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678887593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:56,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140152656] [2021-05-22 02:22:56,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 154 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:56,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:22:56,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:56,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:56,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:56,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:56,266 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,270 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:56,271 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,271 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:22:56,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:56,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,331 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:56,332 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:56,332 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,332 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:56,386 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:56,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140152656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:56,387 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:56,387 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:56,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [196902792] [2021-05-22 02:22:56,387 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:56,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:56,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:56,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:56,387 INFO L87 Difference]: Start difference. First operand 327 states and 972 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:56,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:56,635 INFO L93 Difference]: Finished difference Result 573 states and 1690 transitions. [2021-05-22 02:22:56,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:22:56,635 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:56,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:56,636 INFO L225 Difference]: With dead ends: 573 [2021-05-22 02:22:56,636 INFO L226 Difference]: Without dead ends: 558 [2021-05-22 02:22:56,636 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 295.8ms TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:22:56,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2021-05-22 02:22:56,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 330. [2021-05-22 02:22:56,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9817629179331306) internal successors, (981), 329 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:56,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 981 transitions. [2021-05-22 02:22:56,640 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 981 transitions. Word has length 20 [2021-05-22 02:22:56,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:56,641 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 981 transitions. [2021-05-22 02:22:56,641 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:56,641 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 981 transitions. [2021-05-22 02:22:56,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:56,641 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:56,641 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:56,841 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable458,154 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:56,842 INFO L430 AbstractCegarLoop]: === Iteration 166 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:56,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:56,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1178839468, now seen corresponding path program 154 times [2021-05-22 02:22:56,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:56,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257802469] [2021-05-22 02:22:56,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:56,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:56,929 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:56,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:56,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257802469] [2021-05-22 02:22:56,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257802469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:56,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296637310] [2021-05-22 02:22:56,929 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 155 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:56,954 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:22:56,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:56,955 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:56,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:56,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:56,990 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:56,995 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:56,995 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:57,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:57,028 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,031 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:57,031 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:57,032 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,032 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:22:57,045 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:57,045 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296637310] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:57,045 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:57,045 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:22:57,045 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16827745] [2021-05-22 02:22:57,045 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:22:57,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:57,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:22:57,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:57,046 INFO L87 Difference]: Start difference. First operand 330 states and 981 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:57,206 INFO L93 Difference]: Finished difference Result 429 states and 1266 transitions. [2021-05-22 02:22:57,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:22:57,206 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:57,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:57,207 INFO L225 Difference]: With dead ends: 429 [2021-05-22 02:22:57,207 INFO L226 Difference]: Without dead ends: 414 [2021-05-22 02:22:57,207 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 114.0ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:22:57,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2021-05-22 02:22:57,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 336. [2021-05-22 02:22:57,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.991044776119403) internal successors, (1002), 335 states have internal predecessors, (1002), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1002 transitions. [2021-05-22 02:22:57,211 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1002 transitions. Word has length 20 [2021-05-22 02:22:57,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:57,211 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1002 transitions. [2021-05-22 02:22:57,211 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,211 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1002 transitions. [2021-05-22 02:22:57,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:57,211 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:57,211 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:57,412 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 155 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable459 [2021-05-22 02:22:57,412 INFO L430 AbstractCegarLoop]: === Iteration 167 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:57,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:57,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1786199666, now seen corresponding path program 155 times [2021-05-22 02:22:57,412 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:57,412 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1540876257] [2021-05-22 02:22:57,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:57,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:57,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:57,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1540876257] [2021-05-22 02:22:57,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1540876257] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:57,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513577849] [2021-05-22 02:22:57,509 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 156 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:57,535 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:22:57,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:57,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:57,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:57,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:57,566 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:57,571 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,571 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:22:57,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:57,589 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,593 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:57,593 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:22:57,594 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:57,594 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:22:57,652 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:57,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513577849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:57,652 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:57,652 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:57,652 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587671730] [2021-05-22 02:22:57,652 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:57,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:57,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:57,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:57,653 INFO L87 Difference]: Start difference. First operand 336 states and 1002 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:57,862 INFO L93 Difference]: Finished difference Result 494 states and 1453 transitions. [2021-05-22 02:22:57,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:57,863 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:57,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:57,863 INFO L225 Difference]: With dead ends: 494 [2021-05-22 02:22:57,863 INFO L226 Difference]: Without dead ends: 479 [2021-05-22 02:22:57,863 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 169.3ms TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:57,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-05-22 02:22:57,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 333. [2021-05-22 02:22:57,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9819277108433737) internal successors, (990), 332 states have internal predecessors, (990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 990 transitions. [2021-05-22 02:22:57,867 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 990 transitions. Word has length 20 [2021-05-22 02:22:57,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:57,867 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 990 transitions. [2021-05-22 02:22:57,867 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:57,867 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 990 transitions. [2021-05-22 02:22:57,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:57,868 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:57,868 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:58,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable460,156 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:58,068 INFO L430 AbstractCegarLoop]: === Iteration 168 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:58,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:58,069 INFO L82 PathProgramCache]: Analyzing trace with hash 871118178, now seen corresponding path program 156 times [2021-05-22 02:22:58,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:58,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097325895] [2021-05-22 02:22:58,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:58,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:58,166 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:58,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:58,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097325895] [2021-05-22 02:22:58,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1097325895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:58,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1092412425] [2021-05-22 02:22:58,166 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 157 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:58,192 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:22:58,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:58,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:58,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:58,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:58,222 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:58,227 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:58,227 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:58,227 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:22:58,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:22:58,245 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:58,250 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:58,250 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:22:58,250 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:58,250 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:22:58,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:58,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1092412425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:58,308 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:58,308 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:22:58,308 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207843987] [2021-05-22 02:22:58,308 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:22:58,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:58,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:22:58,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:22:58,308 INFO L87 Difference]: Start difference. First operand 333 states and 990 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:58,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:58,549 INFO L93 Difference]: Finished difference Result 486 states and 1434 transitions. [2021-05-22 02:22:58,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:22:58,550 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:58,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:58,550 INFO L225 Difference]: With dead ends: 486 [2021-05-22 02:22:58,550 INFO L226 Difference]: Without dead ends: 471 [2021-05-22 02:22:58,550 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 178.0ms TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:22:58,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2021-05-22 02:22:58,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 326. [2021-05-22 02:22:58,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9815384615384617) internal successors, (969), 325 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:58,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 969 transitions. [2021-05-22 02:22:58,554 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 969 transitions. Word has length 20 [2021-05-22 02:22:58,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:58,554 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 969 transitions. [2021-05-22 02:22:58,554 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:58,554 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 969 transitions. [2021-05-22 02:22:58,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:58,555 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:58,555 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:58,755 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable461,157 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:58,755 INFO L430 AbstractCegarLoop]: === Iteration 169 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:58,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:58,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1075844112, now seen corresponding path program 157 times [2021-05-22 02:22:58,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:58,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1846929786] [2021-05-22 02:22:58,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:58,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:58,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:58,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:58,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1846929786] [2021-05-22 02:22:58,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1846929786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:58,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [957639803] [2021-05-22 02:22:58,866 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 158 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:58,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:58,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:58,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:58,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:58,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:58,954 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:58,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:58,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:58,962 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:59,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:59,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:59,026 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:59,034 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:59,035 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:59,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:59,036 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:59,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:59,044 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:22:59,044 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:22:59,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:59,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [957639803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:59,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:22:59,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:22:59,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885152433] [2021-05-22 02:22:59,071 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:22:59,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:22:59,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:22:59,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:22:59,071 INFO L87 Difference]: Start difference. First operand 326 states and 969 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:59,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:22:59,451 INFO L93 Difference]: Finished difference Result 492 states and 1453 transitions. [2021-05-22 02:22:59,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:22:59,452 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:22:59,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:22:59,452 INFO L225 Difference]: With dead ends: 492 [2021-05-22 02:22:59,453 INFO L226 Difference]: Without dead ends: 477 [2021-05-22 02:22:59,453 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 309.1ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:22:59,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-05-22 02:22:59,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 331. [2021-05-22 02:22:59,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.984848484848485) internal successors, (985), 330 states have internal predecessors, (985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:59,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 985 transitions. [2021-05-22 02:22:59,456 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 985 transitions. Word has length 20 [2021-05-22 02:22:59,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:22:59,457 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 985 transitions. [2021-05-22 02:22:59,457 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:22:59,457 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 985 transitions. [2021-05-22 02:22:59,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:22:59,457 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:22:59,457 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:22:59,658 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable462,158 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:59,658 INFO L430 AbstractCegarLoop]: === Iteration 170 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:22:59,658 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:22:59,658 INFO L82 PathProgramCache]: Analyzing trace with hash -1577635448, now seen corresponding path program 158 times [2021-05-22 02:22:59,658 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:22:59,658 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089498238] [2021-05-22 02:22:59,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:22:59,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:22:59,815 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:22:59,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:22:59,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089498238] [2021-05-22 02:22:59,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089498238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:22:59,815 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005704123] [2021-05-22 02:22:59,815 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 159 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:22:59,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:22:59,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:22:59,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:22:59,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:22:59,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:59,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:22:59,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:59,937 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:59,939 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:22:59,939 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:22:59,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:59,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:22:59,978 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:22:59,989 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:22:59,992 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:22:59,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:22:59,993 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,004 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:00,005 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,005 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:23:00,073 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:00,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2005704123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:00,073 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:00,073 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:00,073 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023528734] [2021-05-22 02:23:00,073 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:00,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:00,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:00,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:00,074 INFO L87 Difference]: Start difference. First operand 331 states and 985 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:00,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:00,412 INFO L93 Difference]: Finished difference Result 498 states and 1466 transitions. [2021-05-22 02:23:00,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:00,412 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:00,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:00,413 INFO L225 Difference]: With dead ends: 498 [2021-05-22 02:23:00,413 INFO L226 Difference]: Without dead ends: 483 [2021-05-22 02:23:00,414 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 404.6ms TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:00,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-22 02:23:00,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 329. [2021-05-22 02:23:00,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:00,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:23:00,419 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:23:00,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:00,419 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:23:00,419 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:00,419 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:23:00,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:00,419 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:00,420 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:00,640 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 159 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable467 [2021-05-22 02:23:00,641 INFO L430 AbstractCegarLoop]: === Iteration 171 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:00,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:00,641 INFO L82 PathProgramCache]: Analyzing trace with hash 610547728, now seen corresponding path program 159 times [2021-05-22 02:23:00,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:00,641 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1052917145] [2021-05-22 02:23:00,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:00,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:00,783 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:00,784 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:00,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1052917145] [2021-05-22 02:23:00,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1052917145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:00,784 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809065255] [2021-05-22 02:23:00,784 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 160 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:00,816 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:00,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:00,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:00,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:00,897 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:00,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:00,899 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:00,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:00,910 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:23:00,954 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:00,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:00,956 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,967 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:00,969 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:00,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:00,971 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:00,982 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:00,983 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:23:01,042 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:01,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1809065255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:01,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:01,042 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:01,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012429886] [2021-05-22 02:23:01,043 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:01,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:01,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:01,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:01,043 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:01,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:01,442 INFO L93 Difference]: Finished difference Result 465 states and 1373 transitions. [2021-05-22 02:23:01,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:01,443 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:01,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:01,444 INFO L225 Difference]: With dead ends: 465 [2021-05-22 02:23:01,444 INFO L226 Difference]: Without dead ends: 450 [2021-05-22 02:23:01,444 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 332.9ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:01,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-05-22 02:23:01,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 327. [2021-05-22 02:23:01,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:01,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:23:01,449 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:23:01,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:01,449 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:23:01,449 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:01,449 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:23:01,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:01,450 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:01,450 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:01,664 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable468,160 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:01,665 INFO L430 AbstractCegarLoop]: === Iteration 172 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:01,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:01,665 INFO L82 PathProgramCache]: Analyzing trace with hash 646055826, now seen corresponding path program 160 times [2021-05-22 02:23:01,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:01,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452928395] [2021-05-22 02:23:01,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:01,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:01,780 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:01,780 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:01,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452928395] [2021-05-22 02:23:01,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452928395] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:01,780 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109505063] [2021-05-22 02:23:01,780 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 161 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 161 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:01,811 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:01,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:01,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:01,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:01,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:01,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:01,873 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:01,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:01,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:01,886 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:02,013 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:02,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:02,014 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,023 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:02,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:02,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:02,026 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:02,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,036 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:9 [2021-05-22 02:23:02,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:02,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109505063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:02,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:02,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:23:02,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740037442] [2021-05-22 02:23:02,047 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:23:02,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:02,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:23:02,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:02,047 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:02,223 INFO L93 Difference]: Finished difference Result 414 states and 1213 transitions. [2021-05-22 02:23:02,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:02,223 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:02,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:02,224 INFO L225 Difference]: With dead ends: 414 [2021-05-22 02:23:02,224 INFO L226 Difference]: Without dead ends: 399 [2021-05-22 02:23:02,224 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 215.3ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:02,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 399 states. [2021-05-22 02:23:02,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 399 to 333. [2021-05-22 02:23:02,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 3.0) internal successors, (996), 332 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 996 transitions. [2021-05-22 02:23:02,229 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 996 transitions. Word has length 20 [2021-05-22 02:23:02,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:02,229 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 996 transitions. [2021-05-22 02:23:02,229 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,229 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 996 transitions. [2021-05-22 02:23:02,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:02,230 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:02,230 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:02,448 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 161 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable469 [2021-05-22 02:23:02,449 INFO L430 AbstractCegarLoop]: === Iteration 173 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:02,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:02,449 INFO L82 PathProgramCache]: Analyzing trace with hash 144264490, now seen corresponding path program 161 times [2021-05-22 02:23:02,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:02,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241486126] [2021-05-22 02:23:02,449 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:02,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:02,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:02,567 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:02,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241486126] [2021-05-22 02:23:02,567 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [241486126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:02,567 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230859756] [2021-05-22 02:23:02,567 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 162 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 162 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:02,598 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:02,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:02,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:02,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:02,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:02,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:02,643 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,651 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:02,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:02,652 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:02,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:02,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:02,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,716 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:02,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:02,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:02,718 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,726 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:02,727 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:02,727 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:23:02,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:02,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230859756] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:02,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:02,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:02,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155595843] [2021-05-22 02:23:02,740 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:02,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:02,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:02,741 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:02,741 INFO L87 Difference]: Start difference. First operand 333 states and 996 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:02,862 INFO L93 Difference]: Finished difference Result 408 states and 1200 transitions. [2021-05-22 02:23:02,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:02,862 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:02,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:02,863 INFO L225 Difference]: With dead ends: 408 [2021-05-22 02:23:02,863 INFO L226 Difference]: Without dead ends: 393 [2021-05-22 02:23:02,863 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 161.2ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:02,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2021-05-22 02:23:02,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 331. [2021-05-22 02:23:02,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.996969696969697) internal successors, (989), 330 states have internal predecessors, (989), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 989 transitions. [2021-05-22 02:23:02,866 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 989 transitions. Word has length 20 [2021-05-22 02:23:02,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:02,866 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 989 transitions. [2021-05-22 02:23:02,866 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:02,866 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 989 transitions. [2021-05-22 02:23:02,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:02,867 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:02,867 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:03,068 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable474,162 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:03,069 INFO L430 AbstractCegarLoop]: === Iteration 174 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:03,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:03,069 INFO L82 PathProgramCache]: Analyzing trace with hash -1387580654, now seen corresponding path program 162 times [2021-05-22 02:23:03,069 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:03,069 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936172071] [2021-05-22 02:23:03,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:03,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:03,203 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:03,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:03,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936172071] [2021-05-22 02:23:03,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936172071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:03,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795306473] [2021-05-22 02:23:03,203 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 163 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 163 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:03,307 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:23:03,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:03,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:03,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:03,352 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:03,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:03,353 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:03,361 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:03,362 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:03,362 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:03,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:03,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:03,426 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:03,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:03,436 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:03,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:03,437 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:03,444 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:03,445 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:03,446 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:23:03,488 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:03,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795306473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:03,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:03,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:03,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760664058] [2021-05-22 02:23:03,488 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:03,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:03,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:03,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:03,489 INFO L87 Difference]: Start difference. First operand 331 states and 989 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:03,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:03,853 INFO L93 Difference]: Finished difference Result 504 states and 1483 transitions. [2021-05-22 02:23:03,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:03,853 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:03,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:03,854 INFO L225 Difference]: With dead ends: 504 [2021-05-22 02:23:03,854 INFO L226 Difference]: Without dead ends: 489 [2021-05-22 02:23:03,854 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 334.9ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:03,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-05-22 02:23:03,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 328. [2021-05-22 02:23:03,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 2.9908256880733943) internal successors, (978), 327 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:03,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 978 transitions. [2021-05-22 02:23:03,859 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 978 transitions. Word has length 20 [2021-05-22 02:23:03,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:03,859 INFO L482 AbstractCegarLoop]: Abstraction has 328 states and 978 transitions. [2021-05-22 02:23:03,860 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:03,860 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 978 transitions. [2021-05-22 02:23:03,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:03,860 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:03,860 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:04,082 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 163 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable475 [2021-05-22 02:23:04,082 INFO L430 AbstractCegarLoop]: === Iteration 175 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:04,082 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:04,083 INFO L82 PathProgramCache]: Analyzing trace with hash 116721224, now seen corresponding path program 163 times [2021-05-22 02:23:04,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:04,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358383117] [2021-05-22 02:23:04,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:04,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:04,209 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:04,210 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:04,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358383117] [2021-05-22 02:23:04,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358383117] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:04,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273961643] [2021-05-22 02:23:04,210 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 164 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 164 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:04,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:04,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:04,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:04,380 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:04,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:04,382 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:04,393 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:04,394 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:04,394 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:04,431 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:04,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:04,433 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:04,447 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:04,450 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:04,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:04,451 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:04,463 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:04,465 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:04,465 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:23:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:04,487 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273961643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:04,487 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:04,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:04,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [961922065] [2021-05-22 02:23:04,488 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:04,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:04,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:04,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:04,488 INFO L87 Difference]: Start difference. First operand 328 states and 978 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:04,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:04,673 INFO L93 Difference]: Finished difference Result 416 states and 1222 transitions. [2021-05-22 02:23:04,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:04,673 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:04,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:04,674 INFO L225 Difference]: With dead ends: 416 [2021-05-22 02:23:04,674 INFO L226 Difference]: Without dead ends: 401 [2021-05-22 02:23:04,674 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 172.9ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:04,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-05-22 02:23:04,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 327. [2021-05-22 02:23:04,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:04,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:23:04,679 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:23:04,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:04,679 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:23:04,679 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:04,679 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:23:04,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:04,680 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:04,680 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:04,888 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 164 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable480 [2021-05-22 02:23:04,889 INFO L430 AbstractCegarLoop]: === Iteration 176 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:04,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:04,889 INFO L82 PathProgramCache]: Analyzing trace with hash -243293518, now seen corresponding path program 164 times [2021-05-22 02:23:04,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:04,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549959069] [2021-05-22 02:23:04,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:04,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:05,041 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:05,041 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:05,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549959069] [2021-05-22 02:23:05,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549959069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:05,041 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1151742130] [2021-05-22 02:23:05,041 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 165 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 165 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:05,073 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:05,073 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:05,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:05,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:05,133 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:05,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:05,134 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:05,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:05,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:05,147 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:05,219 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:05,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:05,220 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:05,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:05,235 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:05,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:05,236 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:05,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:05,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:05,249 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:12 [2021-05-22 02:23:05,310 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:05,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1151742130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:05,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:05,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:05,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748448378] [2021-05-22 02:23:05,310 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:05,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:05,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:05,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:05,311 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:05,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:05,818 INFO L93 Difference]: Finished difference Result 483 states and 1418 transitions. [2021-05-22 02:23:05,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:05,818 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:05,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:05,819 INFO L225 Difference]: With dead ends: 483 [2021-05-22 02:23:05,819 INFO L226 Difference]: Without dead ends: 468 [2021-05-22 02:23:05,819 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 360.2ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:05,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-05-22 02:23:05,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 330. [2021-05-22 02:23:05,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9939209726443767) internal successors, (985), 329 states have internal predecessors, (985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:05,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 985 transitions. [2021-05-22 02:23:05,824 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 985 transitions. Word has length 20 [2021-05-22 02:23:05,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:05,824 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 985 transitions. [2021-05-22 02:23:05,825 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:05,825 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 985 transitions. [2021-05-22 02:23:05,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:05,825 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:05,825 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:06,040 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable481,165 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:06,041 INFO L430 AbstractCegarLoop]: === Iteration 177 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:06,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:06,041 INFO L82 PathProgramCache]: Analyzing trace with hash -1573221680, now seen corresponding path program 165 times [2021-05-22 02:23:06,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:06,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063619762] [2021-05-22 02:23:06,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:06,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:06,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:06,195 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:06,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063619762] [2021-05-22 02:23:06,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063619762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:06,195 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1090808364] [2021-05-22 02:23:06,195 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 166 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 166 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:06,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:06,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:06,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:06,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:06,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:06,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:06,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:06,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:06,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:06,303 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:06,338 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:06,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:06,339 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:06,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:06,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:06,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:06,357 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:06,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:06,379 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:06,379 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:46, output treesize:15 [2021-05-22 02:23:06,462 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:06,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1090808364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:06,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:06,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:06,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359301056] [2021-05-22 02:23:06,463 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:06,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:06,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:06,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:06,463 INFO L87 Difference]: Start difference. First operand 330 states and 985 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:06,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:06,853 INFO L93 Difference]: Finished difference Result 477 states and 1403 transitions. [2021-05-22 02:23:06,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:06,853 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:06,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:06,854 INFO L225 Difference]: With dead ends: 477 [2021-05-22 02:23:06,854 INFO L226 Difference]: Without dead ends: 462 [2021-05-22 02:23:06,854 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 352.2ms TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:06,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 462 states. [2021-05-22 02:23:06,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 462 to 326. [2021-05-22 02:23:06,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9815384615384617) internal successors, (969), 325 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:06,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 969 transitions. [2021-05-22 02:23:06,859 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 969 transitions. Word has length 20 [2021-05-22 02:23:06,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:06,860 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 969 transitions. [2021-05-22 02:23:06,860 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:06,860 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 969 transitions. [2021-05-22 02:23:06,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:06,860 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:06,860 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:07,080 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable482,166 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:07,081 INFO L430 AbstractCegarLoop]: === Iteration 178 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:07,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:07,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1951666526, now seen corresponding path program 166 times [2021-05-22 02:23:07,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:07,081 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [346769884] [2021-05-22 02:23:07,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:07,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:07,255 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:07,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:07,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [346769884] [2021-05-22 02:23:07,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [346769884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:07,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443104568] [2021-05-22 02:23:07,255 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 167 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 167 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:07,280 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:07,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:07,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:07,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:07,320 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:07,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:07,321 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:07,326 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:07,327 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:07,327 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:23:07,389 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:23:07,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:07,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:07,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:07,397 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:07,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:07,398 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:07,403 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:07,403 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:07,403 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:9 [2021-05-22 02:23:07,430 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:07,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443104568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:07,430 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:07,430 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:07,430 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194503898] [2021-05-22 02:23:07,430 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:07,430 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:07,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:07,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:07,430 INFO L87 Difference]: Start difference. First operand 326 states and 969 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:07,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:07,703 INFO L93 Difference]: Finished difference Result 484 states and 1429 transitions. [2021-05-22 02:23:07,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:23:07,703 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:07,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:07,704 INFO L225 Difference]: With dead ends: 484 [2021-05-22 02:23:07,704 INFO L226 Difference]: Without dead ends: 469 [2021-05-22 02:23:07,704 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 255.1ms TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:23:07,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 469 states. [2021-05-22 02:23:07,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 469 to 336. [2021-05-22 02:23:07,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.997014925373134) internal successors, (1004), 335 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:07,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 1004 transitions. [2021-05-22 02:23:07,708 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 1004 transitions. Word has length 20 [2021-05-22 02:23:07,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:07,708 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 1004 transitions. [2021-05-22 02:23:07,708 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:07,708 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 1004 transitions. [2021-05-22 02:23:07,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:07,709 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:07,709 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:07,910 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable483,167 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:07,910 INFO L430 AbstractCegarLoop]: === Iteration 179 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:07,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:07,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1841509434, now seen corresponding path program 167 times [2021-05-22 02:23:07,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:07,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013373960] [2021-05-22 02:23:07,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:07,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:08,102 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:08,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:08,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013373960] [2021-05-22 02:23:08,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013373960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:08,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713295879] [2021-05-22 02:23:08,103 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 168 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 168 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:08,135 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:08,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:08,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:23:08,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:08,228 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:08,230 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:08,235 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,281 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:08,282 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:08,282 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:77, output treesize:63 [2021-05-22 02:23:08,417 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:23:08,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:23:08,422 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:08,425 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,451 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:08,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2021-05-22 02:23:08,457 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,460 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:08,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:08,461 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:08,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:08,486 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:08,486 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:87, output treesize:33 [2021-05-22 02:23:08,627 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:08,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [713295879] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:08,627 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:08,627 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:08,627 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080726526] [2021-05-22 02:23:08,627 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:08,627 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:08,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:08,628 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:08,628 INFO L87 Difference]: Start difference. First operand 336 states and 1004 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:09,047 INFO L93 Difference]: Finished difference Result 462 states and 1364 transitions. [2021-05-22 02:23:09,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:09,047 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:09,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:09,048 INFO L225 Difference]: With dead ends: 462 [2021-05-22 02:23:09,048 INFO L226 Difference]: Without dead ends: 447 [2021-05-22 02:23:09,048 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 478.1ms TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:09,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 447 states. [2021-05-22 02:23:09,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 447 to 334. [2021-05-22 02:23:09,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 2.993993993993994) internal successors, (997), 333 states have internal predecessors, (997), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 997 transitions. [2021-05-22 02:23:09,053 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 997 transitions. Word has length 20 [2021-05-22 02:23:09,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:09,053 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 997 transitions. [2021-05-22 02:23:09,053 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,053 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 997 transitions. [2021-05-22 02:23:09,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:09,054 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:09,054 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:09,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 168 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable487 [2021-05-22 02:23:09,265 INFO L430 AbstractCegarLoop]: === Iteration 180 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:09,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:09,265 INFO L82 PathProgramCache]: Analyzing trace with hash 309664290, now seen corresponding path program 168 times [2021-05-22 02:23:09,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:09,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934718427] [2021-05-22 02:23:09,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:09,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:09,376 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:09,376 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:09,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934718427] [2021-05-22 02:23:09,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934718427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:09,376 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777935121] [2021-05-22 02:23:09,377 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 169 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 169 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:09,402 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:09,402 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:09,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:09,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:09,450 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:09,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:09,451 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:09,458 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:09,459 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:09,459 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:23:09,522 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:09,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:09,523 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:09,530 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:09,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:09,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:09,533 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:09,539 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:09,540 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:09,540 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:12 [2021-05-22 02:23:09,552 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:09,553 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777935121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:09,553 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:09,553 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:09,553 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608456569] [2021-05-22 02:23:09,553 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:09,553 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:09,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:09,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:09,553 INFO L87 Difference]: Start difference. First operand 334 states and 997 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:09,668 INFO L93 Difference]: Finished difference Result 407 states and 1196 transitions. [2021-05-22 02:23:09,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:09,669 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:09,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:09,669 INFO L225 Difference]: With dead ends: 407 [2021-05-22 02:23:09,669 INFO L226 Difference]: Without dead ends: 392 [2021-05-22 02:23:09,669 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 161.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:09,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2021-05-22 02:23:09,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 331. [2021-05-22 02:23:09,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.987878787878788) internal successors, (986), 330 states have internal predecessors, (986), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 986 transitions. [2021-05-22 02:23:09,673 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 986 transitions. Word has length 20 [2021-05-22 02:23:09,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:09,673 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 986 transitions. [2021-05-22 02:23:09,673 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:09,673 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 986 transitions. [2021-05-22 02:23:09,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:09,673 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:09,674 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:09,874 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 169 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable498 [2021-05-22 02:23:09,874 INFO L430 AbstractCegarLoop]: === Iteration 181 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:09,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:09,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1813966168, now seen corresponding path program 169 times [2021-05-22 02:23:09,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:09,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411689129] [2021-05-22 02:23:09,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:09,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:09,967 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:09,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:09,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411689129] [2021-05-22 02:23:09,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411689129] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:09,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225474338] [2021-05-22 02:23:09,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 170 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 170 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:09,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:09,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:09,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:10,037 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:10,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:10,038 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,045 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,046 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:10,046 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:23:10,072 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:10,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:10,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,082 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,083 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:10,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:10,084 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,092 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,092 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,092 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:15 [2021-05-22 02:23:10,116 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:10,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [225474338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:10,116 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:10,116 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:10,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340608557] [2021-05-22 02:23:10,116 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:10,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:10,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:10,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:10,116 INFO L87 Difference]: Start difference. First operand 331 states and 986 transitions. Second operand has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:10,239 INFO L93 Difference]: Finished difference Result 417 states and 1225 transitions. [2021-05-22 02:23:10,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:10,240 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:10,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:10,240 INFO L225 Difference]: With dead ends: 417 [2021-05-22 02:23:10,240 INFO L226 Difference]: Without dead ends: 402 [2021-05-22 02:23:10,240 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 131.7ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:10,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-05-22 02:23:10,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 330. [2021-05-22 02:23:10,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 329 states have (on average 2.9817629179331306) internal successors, (981), 329 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 981 transitions. [2021-05-22 02:23:10,244 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 981 transitions. Word has length 20 [2021-05-22 02:23:10,244 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:10,244 INFO L482 AbstractCegarLoop]: Abstraction has 330 states and 981 transitions. [2021-05-22 02:23:10,244 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7142857142857142) internal successors, (24), 14 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,244 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 981 transitions. [2021-05-22 02:23:10,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:10,244 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:10,244 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:10,444 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 170 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable503 [2021-05-22 02:23:10,445 INFO L430 AbstractCegarLoop]: === Iteration 182 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:10,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:10,445 INFO L82 PathProgramCache]: Analyzing trace with hash 927926458, now seen corresponding path program 170 times [2021-05-22 02:23:10,445 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:10,445 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370889930] [2021-05-22 02:23:10,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:10,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:10,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:10,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370889930] [2021-05-22 02:23:10,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1370889930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:10,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291899357] [2021-05-22 02:23:10,550 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 171 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 171 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:10,575 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:10,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:10,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:10,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:10,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:10,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,654 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,655 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:10,655 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:25 [2021-05-22 02:23:10,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:10,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:10,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,683 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:10,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:10,686 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,691 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:10,692 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:10,692 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:34, output treesize:12 [2021-05-22 02:23:10,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:10,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291899357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:10,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:10,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:10,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723714406] [2021-05-22 02:23:10,705 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:10,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:10,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:10,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:10,705 INFO L87 Difference]: Start difference. First operand 330 states and 981 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:10,839 INFO L93 Difference]: Finished difference Result 396 states and 1168 transitions. [2021-05-22 02:23:10,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:10,839 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:10,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:10,839 INFO L225 Difference]: With dead ends: 396 [2021-05-22 02:23:10,839 INFO L226 Difference]: Without dead ends: 381 [2021-05-22 02:23:10,840 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 143.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:10,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 381 states. [2021-05-22 02:23:10,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 381 to 327. [2021-05-22 02:23:10,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9846625766871164) internal successors, (973), 326 states have internal predecessors, (973), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 973 transitions. [2021-05-22 02:23:10,843 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 973 transitions. Word has length 20 [2021-05-22 02:23:10,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:10,843 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 973 transitions. [2021-05-22 02:23:10,843 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:10,843 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 973 transitions. [2021-05-22 02:23:10,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:10,844 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:10,844 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:11,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 171 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable504 [2021-05-22 02:23:11,061 INFO L430 AbstractCegarLoop]: === Iteration 183 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:11,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:11,061 INFO L82 PathProgramCache]: Analyzing trace with hash -791058224, now seen corresponding path program 171 times [2021-05-22 02:23:11,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:11,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [178361881] [2021-05-22 02:23:11,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:11,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:11,167 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:11,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:11,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [178361881] [2021-05-22 02:23:11,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [178361881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:11,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1716743579] [2021-05-22 02:23:11,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 172 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 172 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:11,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:11,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:11,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:11,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:11,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:11,255 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:11,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:11,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:11,263 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:23:11,287 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:11,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:11,288 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:11,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:11,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:11,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:11,298 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:11,304 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:11,305 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:11,305 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:23:11,364 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:11,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1716743579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:11,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:11,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:11,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1587294289] [2021-05-22 02:23:11,364 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:11,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:11,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:11,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:11,364 INFO L87 Difference]: Start difference. First operand 327 states and 973 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:11,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:11,609 INFO L93 Difference]: Finished difference Result 476 states and 1396 transitions. [2021-05-22 02:23:11,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:23:11,610 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:11,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:11,610 INFO L225 Difference]: With dead ends: 476 [2021-05-22 02:23:11,611 INFO L226 Difference]: Without dead ends: 461 [2021-05-22 02:23:11,611 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 216.6ms TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:23:11,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-05-22 02:23:11,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 326. [2021-05-22 02:23:11,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 325 states have (on average 2.9815384615384617) internal successors, (969), 325 states have internal predecessors, (969), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:11,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 969 transitions. [2021-05-22 02:23:11,614 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 969 transitions. Word has length 20 [2021-05-22 02:23:11,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:11,615 INFO L482 AbstractCegarLoop]: Abstraction has 326 states and 969 transitions. [2021-05-22 02:23:11,615 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:11,615 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 969 transitions. [2021-05-22 02:23:11,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:11,615 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:11,615 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:11,815 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable508,172 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:11,816 INFO L430 AbstractCegarLoop]: === Iteration 184 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:11,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:11,816 INFO L82 PathProgramCache]: Analyzing trace with hash 605328954, now seen corresponding path program 172 times [2021-05-22 02:23:11,816 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:11,816 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1747067727] [2021-05-22 02:23:11,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:11,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:11,910 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:11,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:11,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1747067727] [2021-05-22 02:23:11,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1747067727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:11,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [909316714] [2021-05-22 02:23:11,910 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 173 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 173 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:11,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:11,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:11,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:11,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:11,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:11,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:11,984 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:11,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:11,994 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:11,994 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:23:12,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:12,047 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,055 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:12,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:12,058 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,066 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:12,067 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,067 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:45, output treesize:12 [2021-05-22 02:23:12,104 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:12,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [909316714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:12,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:12,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:12,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761041055] [2021-05-22 02:23:12,104 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:12,104 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:12,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:12,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:12,105 INFO L87 Difference]: Start difference. First operand 326 states and 969 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:12,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:12,337 INFO L93 Difference]: Finished difference Result 391 states and 1154 transitions. [2021-05-22 02:23:12,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:12,338 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:12,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:12,338 INFO L225 Difference]: With dead ends: 391 [2021-05-22 02:23:12,338 INFO L226 Difference]: Without dead ends: 376 [2021-05-22 02:23:12,338 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 148.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:12,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-05-22 02:23:12,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 332. [2021-05-22 02:23:12,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.990936555891239) internal successors, (990), 331 states have internal predecessors, (990), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:12,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 990 transitions. [2021-05-22 02:23:12,342 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 990 transitions. Word has length 20 [2021-05-22 02:23:12,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:12,342 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 990 transitions. [2021-05-22 02:23:12,342 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:12,342 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 990 transitions. [2021-05-22 02:23:12,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:12,342 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:12,342 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:12,542 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable509,173 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:12,543 INFO L430 AbstractCegarLoop]: === Iteration 185 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:12,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:12,543 INFO L82 PathProgramCache]: Analyzing trace with hash -724599208, now seen corresponding path program 173 times [2021-05-22 02:23:12,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:12,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994825635] [2021-05-22 02:23:12,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:12,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:12,651 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:12,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:12,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994825635] [2021-05-22 02:23:12,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994825635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:12,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2007376563] [2021-05-22 02:23:12,652 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 174 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 174 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:12,677 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:12,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:12,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:23:12,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:12,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:12,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,722 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:12,723 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,743 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:12,744 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:12,744 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:77, output treesize:63 [2021-05-22 02:23:12,788 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:23:12,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:12,791 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:12,795 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,821 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:12,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:12,825 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:12,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:12,828 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:12,852 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:12,853 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:12,853 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:91, output treesize:41 [2021-05-22 02:23:12,955 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:12,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2007376563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:12,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:12,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:12,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982067314] [2021-05-22 02:23:12,956 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:12,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:12,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:12,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:12,956 INFO L87 Difference]: Start difference. First operand 332 states and 990 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:13,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:13,306 INFO L93 Difference]: Finished difference Result 474 states and 1407 transitions. [2021-05-22 02:23:13,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:13,306 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:13,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:13,307 INFO L225 Difference]: With dead ends: 474 [2021-05-22 02:23:13,307 INFO L226 Difference]: Without dead ends: 459 [2021-05-22 02:23:13,307 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 342.1ms TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:13,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2021-05-22 02:23:13,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 329. [2021-05-22 02:23:13,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:13,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:23:13,311 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:23:13,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:13,311 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:23:13,311 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:13,311 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:23:13,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:13,312 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:13,312 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:13,512 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 174 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable510 [2021-05-22 02:23:13,512 INFO L430 AbstractCegarLoop]: === Iteration 186 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:13,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:13,512 INFO L82 PathProgramCache]: Analyzing trace with hash -1639680696, now seen corresponding path program 174 times [2021-05-22 02:23:13,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:13,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276870535] [2021-05-22 02:23:13,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:13,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:13,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:13,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276870535] [2021-05-22 02:23:13,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276870535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:13,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439461824] [2021-05-22 02:23:13,618 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 175 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 175 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:13,644 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:23:13,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:13,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:13,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:13,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:13,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:13,717 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:13,718 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:13,718 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:23:13,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:13,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:13,744 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:13,751 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:13,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:13,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 12 treesize of output 5 [2021-05-22 02:23:13,754 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:13,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:13,761 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:13,761 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:39, output treesize:15 [2021-05-22 02:23:13,819 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:13,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439461824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:13,819 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:13,819 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:13,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1702101590] [2021-05-22 02:23:13,819 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:13,819 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:13,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:13,820 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:13,820 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:14,062 INFO L93 Difference]: Finished difference Result 449 states and 1325 transitions. [2021-05-22 02:23:14,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:23:14,063 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:14,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:14,063 INFO L225 Difference]: With dead ends: 449 [2021-05-22 02:23:14,063 INFO L226 Difference]: Without dead ends: 434 [2021-05-22 02:23:14,063 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 210.3ms TimeCoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:23:14,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-05-22 02:23:14,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 325. [2021-05-22 02:23:14,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:23:14,067 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:23:14,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:14,067 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:23:14,067 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 1.8888888888888888) internal successors, (34), 18 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,067 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:23:14,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:14,067 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:14,068 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:14,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 175 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable517 [2021-05-22 02:23:14,268 INFO L430 AbstractCegarLoop]: === Iteration 187 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:14,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:14,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1136429620, now seen corresponding path program 175 times [2021-05-22 02:23:14,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:14,268 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112991388] [2021-05-22 02:23:14,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:14,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:14,359 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:14,360 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:14,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112991388] [2021-05-22 02:23:14,360 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112991388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:14,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1436489998] [2021-05-22 02:23:14,360 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 176 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 176 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:14,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:14,387 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:14,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:14,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:14,417 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:14,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:14,422 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:14,422 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:14,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:14,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:14,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:14,472 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:14,472 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:14,472 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:24, output treesize:9 [2021-05-22 02:23:14,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:14,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1436489998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:14,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:14,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:14,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263263505] [2021-05-22 02:23:14,498 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:14,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:14,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:14,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:14,498 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:14,828 INFO L93 Difference]: Finished difference Result 516 states and 1525 transitions. [2021-05-22 02:23:14,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:14,828 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:14,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:14,829 INFO L225 Difference]: With dead ends: 516 [2021-05-22 02:23:14,829 INFO L226 Difference]: Without dead ends: 501 [2021-05-22 02:23:14,829 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 231.7ms TimeCoverageRelationStatistics Valid=94, Invalid=326, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:14,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-05-22 02:23:14,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 342. [2021-05-22 02:23:14,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 341 states have (on average 2.997067448680352) internal successors, (1022), 341 states have internal predecessors, (1022), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 1022 transitions. [2021-05-22 02:23:14,833 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 1022 transitions. Word has length 20 [2021-05-22 02:23:14,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:14,833 INFO L482 AbstractCegarLoop]: Abstraction has 342 states and 1022 transitions. [2021-05-22 02:23:14,833 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:14,833 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 1022 transitions. [2021-05-22 02:23:14,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:14,833 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:14,834 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:15,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 176 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable518 [2021-05-22 02:23:15,049 INFO L430 AbstractCegarLoop]: === Iteration 188 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:15,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:15,049 INFO L82 PathProgramCache]: Analyzing trace with hash 634638284, now seen corresponding path program 176 times [2021-05-22 02:23:15,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:15,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724376057] [2021-05-22 02:23:15,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:15,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:15,140 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:15,140 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:15,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724376057] [2021-05-22 02:23:15,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724376057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:15,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423266391] [2021-05-22 02:23:15,140 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 177 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 177 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:15,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:15,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:15,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:15,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:15,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:15,197 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:15,202 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,202 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:15,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:15,239 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,243 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:15,243 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:15,243 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,243 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:23:15,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:15,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1423266391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:15,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:15,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:15,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462433384] [2021-05-22 02:23:15,283 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:15,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:15,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:15,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:15,283 INFO L87 Difference]: Start difference. First operand 342 states and 1022 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:15,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:15,525 INFO L93 Difference]: Finished difference Result 506 states and 1491 transitions. [2021-05-22 02:23:15,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:15,525 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:15,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:15,526 INFO L225 Difference]: With dead ends: 506 [2021-05-22 02:23:15,526 INFO L226 Difference]: Without dead ends: 491 [2021-05-22 02:23:15,526 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 223.2ms TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:15,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-05-22 02:23:15,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 340. [2021-05-22 02:23:15,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 339 states have (on average 2.994100294985251) internal successors, (1015), 339 states have internal predecessors, (1015), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:15,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 1015 transitions. [2021-05-22 02:23:15,531 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 1015 transitions. Word has length 20 [2021-05-22 02:23:15,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:15,532 INFO L482 AbstractCegarLoop]: Abstraction has 340 states and 1015 transitions. [2021-05-22 02:23:15,532 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:15,532 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 1015 transitions. [2021-05-22 02:23:15,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:15,532 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:15,532 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:15,754 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable519,177 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:15,755 INFO L430 AbstractCegarLoop]: === Iteration 189 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:15,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:15,755 INFO L82 PathProgramCache]: Analyzing trace with hash -897206860, now seen corresponding path program 177 times [2021-05-22 02:23:15,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:15,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612675506] [2021-05-22 02:23:15,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:15,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:15,831 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:15,831 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:15,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612675506] [2021-05-22 02:23:15,831 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612675506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:15,831 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112445981] [2021-05-22 02:23:15,831 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 178 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 178 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:15,856 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:15,857 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:15,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:15,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:15,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:15,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,897 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:15,897 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,897 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:15,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:15,930 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,934 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:15,934 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:15,934 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:15,935 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:23:15,946 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:15,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112445981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:15,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:15,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:15,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964775179] [2021-05-22 02:23:15,947 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:15,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:15,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:15,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:15,947 INFO L87 Difference]: Start difference. First operand 340 states and 1015 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:16,058 INFO L93 Difference]: Finished difference Result 441 states and 1298 transitions. [2021-05-22 02:23:16,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:16,058 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:16,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:16,059 INFO L225 Difference]: With dead ends: 441 [2021-05-22 02:23:16,059 INFO L226 Difference]: Without dead ends: 426 [2021-05-22 02:23:16,059 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 117.1ms TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:16,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-05-22 02:23:16,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 337. [2021-05-22 02:23:16,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 2.988095238095238) internal successors, (1004), 336 states have internal predecessors, (1004), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 1004 transitions. [2021-05-22 02:23:16,063 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 1004 transitions. Word has length 20 [2021-05-22 02:23:16,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:16,063 INFO L482 AbstractCegarLoop]: Abstraction has 337 states and 1004 transitions. [2021-05-22 02:23:16,063 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,063 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 1004 transitions. [2021-05-22 02:23:16,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:16,063 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:16,063 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:16,263 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 178 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable520 [2021-05-22 02:23:16,264 INFO L430 AbstractCegarLoop]: === Iteration 190 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:16,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:16,264 INFO L82 PathProgramCache]: Analyzing trace with hash 607095018, now seen corresponding path program 178 times [2021-05-22 02:23:16,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:16,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394112547] [2021-05-22 02:23:16,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:16,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:16,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:16,362 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:16,362 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394112547] [2021-05-22 02:23:16,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394112547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:16,363 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457088817] [2021-05-22 02:23:16,363 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 179 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 179 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:16,393 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:16,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:16,394 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:16,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:16,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:16,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:16,445 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:16,445 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:16,445 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:16,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:16,470 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:16,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:16,476 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:16,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:16,476 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:23:16,497 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:16,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457088817] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:16,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:16,497 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:23:16,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1547019526] [2021-05-22 02:23:16,497 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:23:16,497 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:16,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:23:16,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:16,498 INFO L87 Difference]: Start difference. First operand 337 states and 1004 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:16,639 INFO L93 Difference]: Finished difference Result 451 states and 1327 transitions. [2021-05-22 02:23:16,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:16,640 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:16,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:16,640 INFO L225 Difference]: With dead ends: 451 [2021-05-22 02:23:16,640 INFO L226 Difference]: Without dead ends: 436 [2021-05-22 02:23:16,640 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 137.0ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:16,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-05-22 02:23:16,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 336. [2021-05-22 02:23:16,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 2.982089552238806) internal successors, (999), 335 states have internal predecessors, (999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 999 transitions. [2021-05-22 02:23:16,644 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 999 transitions. Word has length 20 [2021-05-22 02:23:16,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:16,644 INFO L482 AbstractCegarLoop]: Abstraction has 336 states and 999 transitions. [2021-05-22 02:23:16,644 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:16,644 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 999 transitions. [2021-05-22 02:23:16,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:16,648 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:16,648 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:16,869 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 179 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable521 [2021-05-22 02:23:16,869 INFO L430 AbstractCegarLoop]: === Iteration 191 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:16,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:16,870 INFO L82 PathProgramCache]: Analyzing trace with hash -278944692, now seen corresponding path program 179 times [2021-05-22 02:23:16,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:16,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069177657] [2021-05-22 02:23:16,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:16,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:16,954 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:16,954 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:16,954 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069177657] [2021-05-22 02:23:16,955 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1069177657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:16,955 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888871146] [2021-05-22 02:23:16,955 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 180 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 180 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:16,980 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:16,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:16,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:23:16,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:17,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:17,030 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,034 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:17,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,034 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:23:17,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:17,051 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:17,053 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,067 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:17,068 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:17,068 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:17,068 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:35 [2021-05-22 02:23:17,138 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:17,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888871146] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:17,139 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:17,139 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:17,139 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793601934] [2021-05-22 02:23:17,139 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:17,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:17,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:17,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:17,139 INFO L87 Difference]: Start difference. First operand 336 states and 999 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:17,387 INFO L93 Difference]: Finished difference Result 430 states and 1270 transitions. [2021-05-22 02:23:17,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:17,387 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:17,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:17,388 INFO L225 Difference]: With dead ends: 430 [2021-05-22 02:23:17,388 INFO L226 Difference]: Without dead ends: 415 [2021-05-22 02:23:17,388 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 201.7ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:17,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 415 states. [2021-05-22 02:23:17,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 415 to 333. [2021-05-22 02:23:17,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 2.9849397590361444) internal successors, (991), 332 states have internal predecessors, (991), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 991 transitions. [2021-05-22 02:23:17,391 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 991 transitions. Word has length 20 [2021-05-22 02:23:17,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:17,392 INFO L482 AbstractCegarLoop]: Abstraction has 333 states and 991 transitions. [2021-05-22 02:23:17,392 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,392 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 991 transitions. [2021-05-22 02:23:17,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:17,392 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:17,392 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:17,594 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable522,180 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:17,594 INFO L430 AbstractCegarLoop]: === Iteration 192 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:17,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:17,594 INFO L82 PathProgramCache]: Analyzing trace with hash -1997929374, now seen corresponding path program 180 times [2021-05-22 02:23:17,595 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:17,595 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057282696] [2021-05-22 02:23:17,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:17,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:17,677 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:17,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057282696] [2021-05-22 02:23:17,677 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057282696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:17,677 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115906835] [2021-05-22 02:23:17,677 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 181 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 181 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:17,702 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:23:17,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:17,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:17,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:17,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:17,733 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,737 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:17,738 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,738 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:23:17,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:17,754 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,758 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:17,758 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:17,759 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:17,759 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:17,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:17,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115906835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:17,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:17,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:23:17,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742652825] [2021-05-22 02:23:17,781 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:23:17,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:17,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:23:17,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:17,782 INFO L87 Difference]: Start difference. First operand 333 states and 991 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:17,962 INFO L93 Difference]: Finished difference Result 456 states and 1338 transitions. [2021-05-22 02:23:17,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:17,962 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:17,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:17,963 INFO L225 Difference]: With dead ends: 456 [2021-05-22 02:23:17,963 INFO L226 Difference]: Without dead ends: 441 [2021-05-22 02:23:17,963 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 98.7ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:17,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 441 states. [2021-05-22 02:23:17,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 441 to 332. [2021-05-22 02:23:17,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.9818731117824773) internal successors, (987), 331 states have internal predecessors, (987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 987 transitions. [2021-05-22 02:23:17,968 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 987 transitions. Word has length 20 [2021-05-22 02:23:17,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:17,969 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 987 transitions. [2021-05-22 02:23:17,969 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 13 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:17,969 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 987 transitions. [2021-05-22 02:23:17,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:17,969 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:17,969 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:18,188 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable526,181 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:18,189 INFO L430 AbstractCegarLoop]: === Iteration 193 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:18,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:18,189 INFO L82 PathProgramCache]: Analyzing trace with hash 1398268212, now seen corresponding path program 181 times [2021-05-22 02:23:18,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:18,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141052269] [2021-05-22 02:23:18,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:18,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:18,252 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:18,252 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:18,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141052269] [2021-05-22 02:23:18,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141052269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:18,252 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201405208] [2021-05-22 02:23:18,252 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 182 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 182 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:18,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:18,278 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:18,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:18,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:18,300 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,303 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:18,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,303 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:23:18,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:18,313 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:18,317 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:18,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,317 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:26, output treesize:12 [2021-05-22 02:23:18,329 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:18,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201405208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:18,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:18,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:18,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [762317835] [2021-05-22 02:23:18,330 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:18,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:18,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:18,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:18,330 INFO L87 Difference]: Start difference. First operand 332 states and 987 transitions. Second operand has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,422 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:18,422 INFO L93 Difference]: Finished difference Result 528 states and 1552 transitions. [2021-05-22 02:23:18,422 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:18,422 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:18,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:18,423 INFO L225 Difference]: With dead ends: 528 [2021-05-22 02:23:18,423 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:23:18,423 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 69.3ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:23:18,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:23:18,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 327. [2021-05-22 02:23:18,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 2.9877300613496933) internal successors, (974), 326 states have internal predecessors, (974), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 974 transitions. [2021-05-22 02:23:18,427 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 974 transitions. Word has length 20 [2021-05-22 02:23:18,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:18,427 INFO L482 AbstractCegarLoop]: Abstraction has 327 states and 974 transitions. [2021-05-22 02:23:18,427 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.8181818181818181) internal successors, (20), 11 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,427 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 974 transitions. [2021-05-22 02:23:18,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:18,427 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:18,428 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:18,628 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable527,182 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:18,628 INFO L430 AbstractCegarLoop]: === Iteration 194 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:18,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:18,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1361462520, now seen corresponding path program 182 times [2021-05-22 02:23:18,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:18,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146007785] [2021-05-22 02:23:18,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:18,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:18,729 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:18,729 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:18,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146007785] [2021-05-22 02:23:18,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146007785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:18,729 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23796450] [2021-05-22 02:23:18,729 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 183 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 183 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:18,761 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:18,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:18,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:18,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:18,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:18,783 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:18,787 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,788 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:23:18,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:18,810 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,815 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:18,816 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:18,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:18,816 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:18,836 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:18,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23796450] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:18,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:18,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:23:18,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [671154798] [2021-05-22 02:23:18,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:23:18,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:18,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:23:18,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:23:18,837 INFO L87 Difference]: Start difference. First operand 327 states and 974 transitions. Second operand has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:18,980 INFO L93 Difference]: Finished difference Result 570 states and 1661 transitions. [2021-05-22 02:23:18,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:18,980 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:18,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:18,981 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:23:18,981 INFO L226 Difference]: Without dead ends: 555 [2021-05-22 02:23:18,981 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 119.0ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:18,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-22 02:23:18,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 325. [2021-05-22 02:23:18,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 2.9814814814814814) internal successors, (966), 324 states have internal predecessors, (966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 966 transitions. [2021-05-22 02:23:18,986 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 966 transitions. Word has length 20 [2021-05-22 02:23:18,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:18,987 INFO L482 AbstractCegarLoop]: Abstraction has 325 states and 966 transitions. [2021-05-22 02:23:18,987 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:18,987 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 966 transitions. [2021-05-22 02:23:18,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:18,987 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:18,987 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:19,203 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 183 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable528 [2021-05-22 02:23:19,203 INFO L430 AbstractCegarLoop]: === Iteration 195 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:19,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:19,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1139035052, now seen corresponding path program 183 times [2021-05-22 02:23:19,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:19,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [32520133] [2021-05-22 02:23:19,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:19,282 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:19,283 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:19,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [32520133] [2021-05-22 02:23:19,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [32520133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:19,283 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181041678] [2021-05-22 02:23:19,283 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 184 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 184 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:19,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:19,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:19,310 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:19,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:19,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:19,344 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:19,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,349 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:19,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:19,381 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,384 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:19,384 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:19,384 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,385 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:23:19,398 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:19,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181041678] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:19,398 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:19,398 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:19,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708463083] [2021-05-22 02:23:19,398 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:19,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:19,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:19,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:19,398 INFO L87 Difference]: Start difference. First operand 325 states and 966 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:19,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:19,540 INFO L93 Difference]: Finished difference Result 417 states and 1232 transitions. [2021-05-22 02:23:19,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:19,540 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:19,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:19,541 INFO L225 Difference]: With dead ends: 417 [2021-05-22 02:23:19,541 INFO L226 Difference]: Without dead ends: 402 [2021-05-22 02:23:19,541 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 119.0ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:19,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-05-22 02:23:19,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 337. [2021-05-22 02:23:19,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 2.9910714285714284) internal successors, (1005), 336 states have internal predecessors, (1005), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:19,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 1005 transitions. [2021-05-22 02:23:19,544 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 1005 transitions. Word has length 20 [2021-05-22 02:23:19,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:19,544 INFO L482 AbstractCegarLoop]: Abstraction has 337 states and 1005 transitions. [2021-05-22 02:23:19,544 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:19,545 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 1005 transitions. [2021-05-22 02:23:19,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:19,545 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:19,545 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:19,745 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable529,184 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:19,745 INFO L430 AbstractCegarLoop]: === Iteration 196 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:19,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:19,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1826004082, now seen corresponding path program 184 times [2021-05-22 02:23:19,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:19,746 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396476070] [2021-05-22 02:23:19,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:19,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:19,843 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:19,843 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:19,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396476070] [2021-05-22 02:23:19,843 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396476070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:19,843 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697272734] [2021-05-22 02:23:19,844 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 185 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 185 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:19,873 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:19,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:19,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:19,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:19,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:19,903 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,907 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:19,908 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,908 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:19,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:19,925 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,929 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:19,929 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:19,930 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:19,930 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:23:19,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:19,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697272734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:19,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:19,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:19,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6110888] [2021-05-22 02:23:19,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:19,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:19,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:19,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:19,986 INFO L87 Difference]: Start difference. First operand 337 states and 1005 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:20,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:20,297 INFO L93 Difference]: Finished difference Result 501 states and 1475 transitions. [2021-05-22 02:23:20,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:20,298 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:20,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:20,298 INFO L225 Difference]: With dead ends: 501 [2021-05-22 02:23:20,298 INFO L226 Difference]: Without dead ends: 486 [2021-05-22 02:23:20,298 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 256.4ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:20,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2021-05-22 02:23:20,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 334. [2021-05-22 02:23:20,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 333 states have (on average 2.981981981981982) internal successors, (993), 333 states have internal predecessors, (993), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:20,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 993 transitions. [2021-05-22 02:23:20,302 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 993 transitions. Word has length 20 [2021-05-22 02:23:20,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:20,302 INFO L482 AbstractCegarLoop]: Abstraction has 334 states and 993 transitions. [2021-05-22 02:23:20,302 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:20,302 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 993 transitions. [2021-05-22 02:23:20,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:20,303 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:20,303 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:20,503 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 185 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable530 [2021-05-22 02:23:20,503 INFO L430 AbstractCegarLoop]: === Iteration 197 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:20,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:20,503 INFO L82 PathProgramCache]: Analyzing trace with hash 910922594, now seen corresponding path program 185 times [2021-05-22 02:23:20,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:20,503 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048027479] [2021-05-22 02:23:20,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:20,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:20,608 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:20,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:20,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048027479] [2021-05-22 02:23:20,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1048027479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:20,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064370698] [2021-05-22 02:23:20,608 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 186 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 186 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:20,634 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:23:20,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:20,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:23:20,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:20,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:20,664 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:20,669 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:20,669 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:20,669 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:23:20,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:20,687 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:20,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:20,689 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:20,706 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:20,706 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:20,707 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:20,707 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:69, output treesize:41 [2021-05-22 02:23:20,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:20,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2064370698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:20,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:20,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:20,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20457938] [2021-05-22 02:23:20,817 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:20,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:20,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:20,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:20,818 INFO L87 Difference]: Start difference. First operand 334 states and 993 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,113 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:21,113 INFO L93 Difference]: Finished difference Result 489 states and 1457 transitions. [2021-05-22 02:23:21,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:23:21,113 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:21,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:21,114 INFO L225 Difference]: With dead ends: 489 [2021-05-22 02:23:21,114 INFO L226 Difference]: Without dead ends: 474 [2021-05-22 02:23:21,114 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 286.1ms TimeCoverageRelationStatistics Valid=87, Invalid=333, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:21,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2021-05-22 02:23:21,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 331. [2021-05-22 02:23:21,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 330 states have (on average 2.981818181818182) internal successors, (984), 330 states have internal predecessors, (984), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 984 transitions. [2021-05-22 02:23:21,117 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 984 transitions. Word has length 20 [2021-05-22 02:23:21,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:21,118 INFO L482 AbstractCegarLoop]: Abstraction has 331 states and 984 transitions. [2021-05-22 02:23:21,118 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,118 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 984 transitions. [2021-05-22 02:23:21,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:21,118 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:21,118 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:21,318 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 186 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable531 [2021-05-22 02:23:21,319 INFO L430 AbstractCegarLoop]: === Iteration 198 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:21,319 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:21,319 INFO L82 PathProgramCache]: Analyzing trace with hash -1898955376, now seen corresponding path program 186 times [2021-05-22 02:23:21,319 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:21,319 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319082913] [2021-05-22 02:23:21,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:21,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:21,424 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:21,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:21,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319082913] [2021-05-22 02:23:21,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319082913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:21,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63858080] [2021-05-22 02:23:21,424 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 187 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 187 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:21,454 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:23:21,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:21,454 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:21,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:21,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:21,472 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:21,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:21,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:21,476 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:23:21,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:21,494 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:21,498 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:21,498 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:21,499 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:21,499 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:21,554 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:21,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63858080] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:21,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:21,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:23:21,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560740919] [2021-05-22 02:23:21,554 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:23:21,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:21,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:23:21,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:21,555 INFO L87 Difference]: Start difference. First operand 331 states and 984 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:21,827 INFO L93 Difference]: Finished difference Result 578 states and 1700 transitions. [2021-05-22 02:23:21,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:21,827 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:21,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:21,828 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:23:21,828 INFO L226 Difference]: Without dead ends: 563 [2021-05-22 02:23:21,828 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 235.4ms TimeCoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:21,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-05-22 02:23:21,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 323. [2021-05-22 02:23:21,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 2.981366459627329) internal successors, (960), 322 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 960 transitions. [2021-05-22 02:23:21,832 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 960 transitions. Word has length 20 [2021-05-22 02:23:21,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:21,832 INFO L482 AbstractCegarLoop]: Abstraction has 323 states and 960 transitions. [2021-05-22 02:23:21,832 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:21,832 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 960 transitions. [2021-05-22 02:23:21,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:21,832 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:21,832 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:22,032 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable536,187 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:22,033 INFO L430 AbstractCegarLoop]: === Iteration 199 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:22,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:22,033 INFO L82 PathProgramCache]: Analyzing trace with hash -1547300954, now seen corresponding path program 187 times [2021-05-22 02:23:22,033 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:22,033 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279547247] [2021-05-22 02:23:22,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:22,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:22,123 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:22,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:22,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279547247] [2021-05-22 02:23:22,123 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279547247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:22,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244343142] [2021-05-22 02:23:22,123 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 188 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 188 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:22,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:22,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:22,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:22,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:22,163 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:22,167 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:22,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:22,167 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:23:22,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:22,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:22,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:22,211 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:22,212 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:22,212 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:23:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:22,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244343142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:22,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:22,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:22,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678512366] [2021-05-22 02:23:22,252 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:22,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:22,252 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:22,252 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:22,252 INFO L87 Difference]: Start difference. First operand 323 states and 960 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:22,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:22,732 INFO L93 Difference]: Finished difference Result 703 states and 2067 transitions. [2021-05-22 02:23:22,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:23:22,733 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:22,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:22,733 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:23:22,733 INFO L226 Difference]: Without dead ends: 688 [2021-05-22 02:23:22,734 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 372.8ms TimeCoverageRelationStatistics Valid=154, Invalid=602, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:23:22,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-22 02:23:22,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 332. [2021-05-22 02:23:22,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 332 states, 331 states have (on average 2.9818731117824773) internal successors, (987), 331 states have internal predecessors, (987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:22,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 332 states to 332 states and 987 transitions. [2021-05-22 02:23:22,738 INFO L78 Accepts]: Start accepts. Automaton has 332 states and 987 transitions. Word has length 20 [2021-05-22 02:23:22,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:22,738 INFO L482 AbstractCegarLoop]: Abstraction has 332 states and 987 transitions. [2021-05-22 02:23:22,738 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:22,738 INFO L276 IsEmpty]: Start isEmpty. Operand 332 states and 987 transitions. [2021-05-22 02:23:22,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:22,738 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:22,739 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:22,939 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable537,188 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:22,939 INFO L430 AbstractCegarLoop]: === Iteration 200 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:22,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:22,939 INFO L82 PathProgramCache]: Analyzing trace with hash 580451194, now seen corresponding path program 188 times [2021-05-22 02:23:22,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:22,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [144686590] [2021-05-22 02:23:22,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:22,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:23,013 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:23,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:23,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [144686590] [2021-05-22 02:23:23,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [144686590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:23,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992554474] [2021-05-22 02:23:23,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 189 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 189 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:23,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:23,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:23,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:23,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:23,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:23,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:23,078 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,078 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:23,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:23,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,113 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:23,113 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:23,114 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,114 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:27, output treesize:12 [2021-05-22 02:23:23,127 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:23,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992554474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:23,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:23,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:23,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871004460] [2021-05-22 02:23:23,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:23,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:23,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:23,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:23,128 INFO L87 Difference]: Start difference. First operand 332 states and 987 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:23,254 INFO L93 Difference]: Finished difference Result 523 states and 1537 transitions. [2021-05-22 02:23:23,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-22 02:23:23,254 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:23,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:23,255 INFO L225 Difference]: With dead ends: 523 [2021-05-22 02:23:23,255 INFO L226 Difference]: Without dead ends: 508 [2021-05-22 02:23:23,255 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 121.4ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:23,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-05-22 02:23:23,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 338. [2021-05-22 02:23:23,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 2.9910979228486645) internal successors, (1008), 337 states have internal predecessors, (1008), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 1008 transitions. [2021-05-22 02:23:23,260 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 1008 transitions. Word has length 20 [2021-05-22 02:23:23,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:23,260 INFO L482 AbstractCegarLoop]: Abstraction has 338 states and 1008 transitions. [2021-05-22 02:23:23,260 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,260 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 1008 transitions. [2021-05-22 02:23:23,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:23,260 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:23,260 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:23,460 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable538,189 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:23,461 INFO L430 AbstractCegarLoop]: === Iteration 201 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:23,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:23,461 INFO L82 PathProgramCache]: Analyzing trace with hash -749476968, now seen corresponding path program 189 times [2021-05-22 02:23:23,461 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:23,461 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [928174220] [2021-05-22 02:23:23,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:23,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:23,556 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:23,556 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:23,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [928174220] [2021-05-22 02:23:23,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [928174220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:23,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766187637] [2021-05-22 02:23:23,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 190 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 190 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:23,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:23,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:23,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:23,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:23,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:23,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,622 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:23,623 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,623 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:23,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:23,640 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:23,645 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:23,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:23,645 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:23:23,703 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:23,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766187637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:23,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:23,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:23,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419643648] [2021-05-22 02:23:23,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:23,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:23,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:23,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:23,704 INFO L87 Difference]: Start difference. First operand 338 states and 1008 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:23,954 INFO L93 Difference]: Finished difference Result 599 states and 1756 transitions. [2021-05-22 02:23:23,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:23:23,954 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:23,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:23,955 INFO L225 Difference]: With dead ends: 599 [2021-05-22 02:23:23,955 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:23:23,955 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 198.5ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:23,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:23:23,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 335. [2021-05-22 02:23:23,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 2.9820359281437128) internal successors, (996), 334 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 996 transitions. [2021-05-22 02:23:23,959 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 996 transitions. Word has length 20 [2021-05-22 02:23:23,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:23,959 INFO L482 AbstractCegarLoop]: Abstraction has 335 states and 996 transitions. [2021-05-22 02:23:23,959 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:23,959 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 996 transitions. [2021-05-22 02:23:23,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:23,959 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:23,960 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:24,160 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 190 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable539 [2021-05-22 02:23:24,160 INFO L430 AbstractCegarLoop]: === Iteration 202 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:24,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:24,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1664558456, now seen corresponding path program 190 times [2021-05-22 02:23:24,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:24,161 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699007819] [2021-05-22 02:23:24,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:24,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:24,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:24,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:24,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699007819] [2021-05-22 02:23:24,244 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699007819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:24,244 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371955449] [2021-05-22 02:23:24,244 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 191 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 191 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:24,269 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:24,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:24,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:24,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:24,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:24,304 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:24,308 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:24,309 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:24,309 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:23:24,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:24,326 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:24,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:24,330 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:24,331 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:24,331 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:24,398 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:24,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371955449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:24,398 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:24,398 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:24,398 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147059565] [2021-05-22 02:23:24,398 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:24,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:24,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:24,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:24,399 INFO L87 Difference]: Start difference. First operand 335 states and 996 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:24,630 INFO L93 Difference]: Finished difference Result 591 states and 1737 transitions. [2021-05-22 02:23:24,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:23:24,631 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:24,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:24,631 INFO L225 Difference]: With dead ends: 591 [2021-05-22 02:23:24,632 INFO L226 Difference]: Without dead ends: 576 [2021-05-22 02:23:24,632 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 190.7ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:24,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-22 02:23:24,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 329. [2021-05-22 02:23:24,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:24,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:23:24,638 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:23:24,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:24,638 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:23:24,638 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:24,638 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:23:24,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:24,639 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:24,639 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:24,861 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 191 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable540 [2021-05-22 02:23:24,862 INFO L430 AbstractCegarLoop]: === Iteration 203 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:24,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:24,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1655436906, now seen corresponding path program 191 times [2021-05-22 02:23:24,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:24,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107708643] [2021-05-22 02:23:24,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:24,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:24,948 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:24,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107708643] [2021-05-22 02:23:24,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107708643] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:24,948 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1741088488] [2021-05-22 02:23:24,948 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 192 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 192 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:24,978 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:24,978 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:24,979 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 22 conjunts are in the unsatisfiable core [2021-05-22 02:23:24,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:25,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:25,013 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:25,025 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:25,044 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:25,044 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:67, output treesize:53 [2021-05-22 02:23:25,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 24 [2021-05-22 02:23:25,105 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:25,108 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,119 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:25,119 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:25,119 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:25,119 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:33 [2021-05-22 02:23:25,200 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:25,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1741088488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:25,200 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:25,200 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:25,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469698198] [2021-05-22 02:23:25,200 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:25,200 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:25,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:25,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:25,200 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:25,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:25,468 INFO L93 Difference]: Finished difference Result 509 states and 1497 transitions. [2021-05-22 02:23:25,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:23:25,468 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:25,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:25,469 INFO L225 Difference]: With dead ends: 509 [2021-05-22 02:23:25,469 INFO L226 Difference]: Without dead ends: 494 [2021-05-22 02:23:25,469 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 322.5ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:23:25,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2021-05-22 02:23:25,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 341. [2021-05-22 02:23:25,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 2.9911764705882353) internal successors, (1017), 340 states have internal predecessors, (1017), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:25,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 1017 transitions. [2021-05-22 02:23:25,473 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 1017 transitions. Word has length 20 [2021-05-22 02:23:25,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:25,473 INFO L482 AbstractCegarLoop]: Abstraction has 341 states and 1017 transitions. [2021-05-22 02:23:25,473 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:25,473 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 1017 transitions. [2021-05-22 02:23:25,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:25,474 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:25,474 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:25,674 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable541,192 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:25,674 INFO L430 AbstractCegarLoop]: === Iteration 204 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:25,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:25,675 INFO L82 PathProgramCache]: Analyzing trace with hash 325508744, now seen corresponding path program 192 times [2021-05-22 02:23:25,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:25,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817388066] [2021-05-22 02:23:25,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:25,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:25,763 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:25,763 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:25,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817388066] [2021-05-22 02:23:25,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817388066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:25,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [774544261] [2021-05-22 02:23:25,764 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 193 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 193 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:25,796 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:23:25,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:25,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:25,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:25,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:25,829 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,834 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:25,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,834 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:25,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:23:25,851 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,856 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:25,856 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:25,856 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:25,856 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:15 [2021-05-22 02:23:25,913 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:25,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [774544261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:25,913 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:25,913 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:25,913 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1937152392] [2021-05-22 02:23:25,913 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:25,913 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:25,914 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:25,914 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:25,914 INFO L87 Difference]: Start difference. First operand 341 states and 1017 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:26,184 INFO L93 Difference]: Finished difference Result 604 states and 1772 transitions. [2021-05-22 02:23:26,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:26,184 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:26,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:26,185 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:23:26,185 INFO L226 Difference]: Without dead ends: 589 [2021-05-22 02:23:26,185 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 231.0ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:23:26,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-22 02:23:26,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 338. [2021-05-22 02:23:26,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 338 states, 337 states have (on average 2.9821958456973294) internal successors, (1005), 337 states have internal predecessors, (1005), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 1005 transitions. [2021-05-22 02:23:26,189 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 1005 transitions. Word has length 20 [2021-05-22 02:23:26,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:26,189 INFO L482 AbstractCegarLoop]: Abstraction has 338 states and 1005 transitions. [2021-05-22 02:23:26,190 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,190 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 1005 transitions. [2021-05-22 02:23:26,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:26,190 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:26,190 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:26,390 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 193 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable552 [2021-05-22 02:23:26,391 INFO L430 AbstractCegarLoop]: === Iteration 205 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:26,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:26,391 INFO L82 PathProgramCache]: Analyzing trace with hash -589572744, now seen corresponding path program 193 times [2021-05-22 02:23:26,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:26,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720687832] [2021-05-22 02:23:26,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:26,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:26,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:26,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720687832] [2021-05-22 02:23:26,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720687832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:26,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [595189506] [2021-05-22 02:23:26,474 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 194 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 194 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:26,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:26,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:26,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:26,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:26,537 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:26,542 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:26,542 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:26,542 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:23:26,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:26,560 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:26,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:26,566 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:26,567 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:26,567 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:26,625 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:26,625 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [595189506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:26,625 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:26,625 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:23:26,625 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940395408] [2021-05-22 02:23:26,625 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:23:26,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:26,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:23:26,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:26,626 INFO L87 Difference]: Start difference. First operand 338 states and 1005 transitions. Second operand has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:26,932 INFO L93 Difference]: Finished difference Result 583 states and 1715 transitions. [2021-05-22 02:23:26,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:23:26,932 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:26,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:26,933 INFO L225 Difference]: With dead ends: 583 [2021-05-22 02:23:26,933 INFO L226 Difference]: Without dead ends: 568 [2021-05-22 02:23:26,933 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 205.2ms TimeCoverageRelationStatistics Valid=96, Invalid=366, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:26,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2021-05-22 02:23:26,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 335. [2021-05-22 02:23:26,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 2.9820359281437128) internal successors, (996), 334 states have internal predecessors, (996), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 996 transitions. [2021-05-22 02:23:26,938 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 996 transitions. Word has length 20 [2021-05-22 02:23:26,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:26,938 INFO L482 AbstractCegarLoop]: Abstraction has 335 states and 996 transitions. [2021-05-22 02:23:26,938 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 17 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:26,938 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 996 transitions. [2021-05-22 02:23:26,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-05-22 02:23:26,938 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:26,938 INFO L521 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:27,138 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 194 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable553 [2021-05-22 02:23:27,139 INFO L430 AbstractCegarLoop]: === Iteration 206 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:27,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:27,139 INFO L82 PathProgramCache]: Analyzing trace with hash 895516582, now seen corresponding path program 194 times [2021-05-22 02:23:27,139 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:27,139 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748538050] [2021-05-22 02:23:27,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:27,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:27,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:27,219 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:27,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748538050] [2021-05-22 02:23:27,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1748538050] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:27,219 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342301385] [2021-05-22 02:23:27,219 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 195 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 195 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:27,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:27,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:27,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-22 02:23:27,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:27,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:27,268 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,272 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:27,272 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,272 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:23:27,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-05-22 02:23:27,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:27,295 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:27,295 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,295 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:15 [2021-05-22 02:23:27,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:27,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342301385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:27,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:27,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:23:27,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133800173] [2021-05-22 02:23:27,350 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:23:27,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:27,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:23:27,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:27,350 INFO L87 Difference]: Start difference. First operand 335 states and 996 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:27,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:27,649 INFO L93 Difference]: Finished difference Result 685 states and 2009 transitions. [2021-05-22 02:23:27,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:27,649 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-05-22 02:23:27,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:27,650 INFO L225 Difference]: With dead ends: 685 [2021-05-22 02:23:27,650 INFO L226 Difference]: Without dead ends: 670 [2021-05-22 02:23:27,650 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 210.3ms TimeCoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:27,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-22 02:23:27,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 329. [2021-05-22 02:23:27,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 2.981707317073171) internal successors, (978), 328 states have internal predecessors, (978), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:27,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 978 transitions. [2021-05-22 02:23:27,655 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 978 transitions. Word has length 20 [2021-05-22 02:23:27,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:27,655 INFO L482 AbstractCegarLoop]: Abstraction has 329 states and 978 transitions. [2021-05-22 02:23:27,655 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:27,655 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 978 transitions. [2021-05-22 02:23:27,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:27,655 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:27,655 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:27,856 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 195 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable554 [2021-05-22 02:23:27,856 INFO L430 AbstractCegarLoop]: === Iteration 207 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:27,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:27,856 INFO L82 PathProgramCache]: Analyzing trace with hash 1458639285, now seen corresponding path program 195 times [2021-05-22 02:23:27,856 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:27,856 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867147186] [2021-05-22 02:23:27,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:27,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:27,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:27,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:27,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867147186] [2021-05-22 02:23:27,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867147186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:27,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537728458] [2021-05-22 02:23:27,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 196 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 196 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:27,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:27,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:27,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:27,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:27,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:27,991 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,994 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:27,994 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:27,994 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:23:28,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:28,010 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,013 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:28,013 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:28,014 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,014 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:28,022 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:28,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1537728458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:28,022 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:28,022 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:28,022 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380491671] [2021-05-22 02:23:28,023 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:28,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:28,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:28,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:28,023 INFO L87 Difference]: Start difference. First operand 329 states and 978 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:28,182 INFO L93 Difference]: Finished difference Result 498 states and 1467 transitions. [2021-05-22 02:23:28,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:28,183 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:28,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:28,183 INFO L225 Difference]: With dead ends: 498 [2021-05-22 02:23:28,184 INFO L226 Difference]: Without dead ends: 476 [2021-05-22 02:23:28,184 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 85.8ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:28,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2021-05-22 02:23:28,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 343. [2021-05-22 02:23:28,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 342 states have (on average 3.017543859649123) internal successors, (1032), 342 states have internal predecessors, (1032), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 1032 transitions. [2021-05-22 02:23:28,189 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 1032 transitions. Word has length 21 [2021-05-22 02:23:28,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:28,189 INFO L482 AbstractCegarLoop]: Abstraction has 343 states and 1032 transitions. [2021-05-22 02:23:28,189 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,189 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 1032 transitions. [2021-05-22 02:23:28,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:28,190 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:28,190 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:28,412 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable555,196 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:28,412 INFO L430 AbstractCegarLoop]: === Iteration 208 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:28,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:28,413 INFO L82 PathProgramCache]: Analyzing trace with hash -484060907, now seen corresponding path program 196 times [2021-05-22 02:23:28,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:28,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279887863] [2021-05-22 02:23:28,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:28,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:28,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:28,486 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:28,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279887863] [2021-05-22 02:23:28,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279887863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:28,486 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2079813105] [2021-05-22 02:23:28,486 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 197 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 197 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:28,512 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:28,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:28,513 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:28,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:28,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:28,541 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:28,545 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,545 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:23:28,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:28,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:28,562 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:28,562 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:28,562 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:28,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:28,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2079813105] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:28,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:28,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:28,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156484039] [2021-05-22 02:23:28,570 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:28,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:28,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:28,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:28,571 INFO L87 Difference]: Start difference. First operand 343 states and 1032 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:28,651 INFO L93 Difference]: Finished difference Result 446 states and 1332 transitions. [2021-05-22 02:23:28,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:28,652 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:28,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:28,652 INFO L225 Difference]: With dead ends: 446 [2021-05-22 02:23:28,652 INFO L226 Difference]: Without dead ends: 424 [2021-05-22 02:23:28,653 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 76.5ms TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:28,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-05-22 02:23:28,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 349. [2021-05-22 02:23:28,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 3.0258620689655173) internal successors, (1053), 348 states have internal predecessors, (1053), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 1053 transitions. [2021-05-22 02:23:28,656 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 1053 transitions. Word has length 21 [2021-05-22 02:23:28,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:28,656 INFO L482 AbstractCegarLoop]: Abstraction has 349 states and 1053 transitions. [2021-05-22 02:23:28,656 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:28,657 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 1053 transitions. [2021-05-22 02:23:28,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:28,657 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:28,657 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:28,857 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 197 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable557 [2021-05-22 02:23:28,858 INFO L430 AbstractCegarLoop]: === Iteration 209 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:28,858 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:28,858 INFO L82 PathProgramCache]: Analyzing trace with hash -985852243, now seen corresponding path program 197 times [2021-05-22 02:23:28,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:28,858 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935482670] [2021-05-22 02:23:28,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:28,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:28,929 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:28,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:28,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935482670] [2021-05-22 02:23:28,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935482670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:28,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604251945] [2021-05-22 02:23:28,929 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 198 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 198 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:28,955 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:28,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:28,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:28,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:28,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:28,996 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:29,000 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,000 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:23:29,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:29,010 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,013 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:29,013 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:29,013 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,013 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:23:29,026 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:29,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604251945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:29,026 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:29,026 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:23:29,026 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24664478] [2021-05-22 02:23:29,026 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:23:29,026 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:29,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:23:29,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:23:29,027 INFO L87 Difference]: Start difference. First operand 349 states and 1053 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:29,124 INFO L93 Difference]: Finished difference Result 455 states and 1356 transitions. [2021-05-22 02:23:29,124 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:29,124 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:29,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:29,125 INFO L225 Difference]: With dead ends: 455 [2021-05-22 02:23:29,125 INFO L226 Difference]: Without dead ends: 433 [2021-05-22 02:23:29,125 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 88.3ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:23:29,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-05-22 02:23:29,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 346. [2021-05-22 02:23:29,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 345 states have (on average 3.017391304347826) internal successors, (1041), 345 states have internal predecessors, (1041), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 1041 transitions. [2021-05-22 02:23:29,128 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 1041 transitions. Word has length 21 [2021-05-22 02:23:29,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:29,129 INFO L482 AbstractCegarLoop]: Abstraction has 346 states and 1041 transitions. [2021-05-22 02:23:29,129 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,129 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 1041 transitions. [2021-05-22 02:23:29,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:29,129 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:29,129 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:29,329 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable559,198 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:29,330 INFO L430 AbstractCegarLoop]: === Iteration 210 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:29,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:29,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1202330933, now seen corresponding path program 198 times [2021-05-22 02:23:29,330 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:29,330 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1622710604] [2021-05-22 02:23:29,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:29,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:29,434 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:29,434 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:29,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1622710604] [2021-05-22 02:23:29,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1622710604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:29,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380568367] [2021-05-22 02:23:29,434 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 199 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 199 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:29,465 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:23:29,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:29,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:29,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:29,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:29,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:29,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,514 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:23:29,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:29,529 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,532 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:29,532 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:29,533 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,533 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:23:29,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:29,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380568367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:29,546 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:29,546 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:23:29,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1647734018] [2021-05-22 02:23:29,546 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:23:29,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:29,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:23:29,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:29,547 INFO L87 Difference]: Start difference. First operand 346 states and 1041 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:29,669 INFO L93 Difference]: Finished difference Result 443 states and 1323 transitions. [2021-05-22 02:23:29,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:29,669 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:29,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:29,669 INFO L225 Difference]: With dead ends: 443 [2021-05-22 02:23:29,670 INFO L226 Difference]: Without dead ends: 421 [2021-05-22 02:23:29,670 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 122.6ms TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:29,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-05-22 02:23:29,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 345. [2021-05-22 02:23:29,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 3.0319767441860463) internal successors, (1043), 344 states have internal predecessors, (1043), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 1043 transitions. [2021-05-22 02:23:29,673 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 1043 transitions. Word has length 21 [2021-05-22 02:23:29,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:29,673 INFO L482 AbstractCegarLoop]: Abstraction has 345 states and 1043 transitions. [2021-05-22 02:23:29,673 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:29,673 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 1043 transitions. [2021-05-22 02:23:29,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:29,674 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:29,674 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:29,874 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable561,199 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:29,874 INFO L430 AbstractCegarLoop]: === Iteration 211 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:29,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:29,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1099695243, now seen corresponding path program 199 times [2021-05-22 02:23:29,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:29,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505802816] [2021-05-22 02:23:29,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:29,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:29,939 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:29,939 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:29,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505802816] [2021-05-22 02:23:29,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505802816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:29,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712207432] [2021-05-22 02:23:29,939 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 200 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 200 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:29,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:29,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:29,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:29,991 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:29,992 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:29,994 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:29,997 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:29,997 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:29,997 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:23:30,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:30,015 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,018 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:30,018 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:30,018 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,018 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:23:30,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:30,041 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712207432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:30,041 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:30,041 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:30,041 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046709914] [2021-05-22 02:23:30,041 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:30,041 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:30,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:30,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:30,041 INFO L87 Difference]: Start difference. First operand 345 states and 1043 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:30,249 INFO L93 Difference]: Finished difference Result 645 states and 1913 transitions. [2021-05-22 02:23:30,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:30,249 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:30,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:30,250 INFO L225 Difference]: With dead ends: 645 [2021-05-22 02:23:30,250 INFO L226 Difference]: Without dead ends: 626 [2021-05-22 02:23:30,250 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 101.1ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:23:30,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-05-22 02:23:30,254 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 353. [2021-05-22 02:23:30,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 352 states have (on average 3.0369318181818183) internal successors, (1069), 352 states have internal predecessors, (1069), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 1069 transitions. [2021-05-22 02:23:30,255 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 1069 transitions. Word has length 21 [2021-05-22 02:23:30,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:30,255 INFO L482 AbstractCegarLoop]: Abstraction has 353 states and 1069 transitions. [2021-05-22 02:23:30,255 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,255 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 1069 transitions. [2021-05-22 02:23:30,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:30,255 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:30,256 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:30,456 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 200 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable563 [2021-05-22 02:23:30,456 INFO L430 AbstractCegarLoop]: === Iteration 212 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:30,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:30,456 INFO L82 PathProgramCache]: Analyzing trace with hash 2056460365, now seen corresponding path program 200 times [2021-05-22 02:23:30,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:30,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389462819] [2021-05-22 02:23:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:30,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:30,519 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:30,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389462819] [2021-05-22 02:23:30,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389462819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:30,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325780221] [2021-05-22 02:23:30,519 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 201 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 201 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:30,545 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:30,545 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:30,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:30,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:30,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:30,568 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:30,571 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,571 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:23:30,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:30,595 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:30,597 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:30,599 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:30,599 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:30,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:30,600 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:23:30,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:30,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325780221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:30,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:30,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:30,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217811841] [2021-05-22 02:23:30,623 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:30,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:30,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:30,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:30,623 INFO L87 Difference]: Start difference. First operand 353 states and 1069 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:30,766 INFO L93 Difference]: Finished difference Result 595 states and 1773 transitions. [2021-05-22 02:23:30,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:23:30,767 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:30,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:30,767 INFO L225 Difference]: With dead ends: 595 [2021-05-22 02:23:30,767 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:23:30,768 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 110.0ms TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:30,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:23:30,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 353. [2021-05-22 02:23:30,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 353 states, 352 states have (on average 3.03125) internal successors, (1067), 352 states have internal predecessors, (1067), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 353 states to 353 states and 1067 transitions. [2021-05-22 02:23:30,773 INFO L78 Accepts]: Start accepts. Automaton has 353 states and 1067 transitions. Word has length 21 [2021-05-22 02:23:30,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:30,773 INFO L482 AbstractCegarLoop]: Abstraction has 353 states and 1067 transitions. [2021-05-22 02:23:30,773 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:30,773 INFO L276 IsEmpty]: Start isEmpty. Operand 353 states and 1067 transitions. [2021-05-22 02:23:30,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:30,773 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:30,774 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:30,985 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable566,201 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:30,985 INFO L430 AbstractCegarLoop]: === Iteration 213 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:30,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:30,985 INFO L82 PathProgramCache]: Analyzing trace with hash -843004949, now seen corresponding path program 201 times [2021-05-22 02:23:30,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:30,985 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437813811] [2021-05-22 02:23:30,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:30,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:31,063 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:31,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:31,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437813811] [2021-05-22 02:23:31,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437813811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:31,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459723108] [2021-05-22 02:23:31,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 202 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 202 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:31,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:31,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:31,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:31,091 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:31,145 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:31,146 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:31,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:31,147 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:31,149 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:31,155 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:31,155 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:20 [2021-05-22 02:23:31,247 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:31,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:31,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,254 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:31,256 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:31,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:31,257 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:31,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,263 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:23:31,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:31,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459723108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:31,287 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:31,287 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:31,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121316198] [2021-05-22 02:23:31,288 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:31,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:31,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:31,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:31,288 INFO L87 Difference]: Start difference. First operand 353 states and 1067 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:31,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:31,620 INFO L93 Difference]: Finished difference Result 737 states and 2196 transitions. [2021-05-22 02:23:31,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:23:31,620 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:31,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:31,621 INFO L225 Difference]: With dead ends: 737 [2021-05-22 02:23:31,621 INFO L226 Difference]: Without dead ends: 718 [2021-05-22 02:23:31,621 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 290.3ms TimeCoverageRelationStatistics Valid=111, Invalid=489, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:23:31,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-05-22 02:23:31,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 355. [2021-05-22 02:23:31,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 3.0282485875706215) internal successors, (1072), 354 states have internal predecessors, (1072), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:31,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 1072 transitions. [2021-05-22 02:23:31,626 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 1072 transitions. Word has length 21 [2021-05-22 02:23:31,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:31,626 INFO L482 AbstractCegarLoop]: Abstraction has 355 states and 1072 transitions. [2021-05-22 02:23:31,626 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:31,626 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 1072 transitions. [2021-05-22 02:23:31,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:31,626 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:31,626 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:31,827 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 202 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable569 [2021-05-22 02:23:31,827 INFO L430 AbstractCegarLoop]: === Iteration 214 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:31,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:31,827 INFO L82 PathProgramCache]: Analyzing trace with hash 843386891, now seen corresponding path program 202 times [2021-05-22 02:23:31,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:31,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476581350] [2021-05-22 02:23:31,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:31,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:31,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:31,906 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:31,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476581350] [2021-05-22 02:23:31,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476581350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:31,906 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [332498375] [2021-05-22 02:23:31,906 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 203 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 203 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:31,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:31,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:31,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:31,932 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:31,986 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:31,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:31,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:31,988 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:31,990 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:31,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:31,996 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:31,996 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:20 [2021-05-22 02:23:32,044 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4, v_prenex_12], 1=[v_prenex_11]} [2021-05-22 02:23:32,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:32,047 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:32,057 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:32,057 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:32,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:32,059 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:32,067 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:32,069 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:32,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:32,069 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:32,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:32,078 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:32,078 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:23:32,119 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:32,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [332498375] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:32,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:32,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:32,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521055524] [2021-05-22 02:23:32,120 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:32,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:32,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:32,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:32,120 INFO L87 Difference]: Start difference. First operand 355 states and 1072 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:32,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:32,626 INFO L93 Difference]: Finished difference Result 781 states and 2340 transitions. [2021-05-22 02:23:32,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:23:32,626 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:32,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:32,627 INFO L225 Difference]: With dead ends: 781 [2021-05-22 02:23:32,627 INFO L226 Difference]: Without dead ends: 758 [2021-05-22 02:23:32,627 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 348.1ms TimeCoverageRelationStatistics Valid=135, Invalid=621, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:23:32,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 758 states. [2021-05-22 02:23:32,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 758 to 355. [2021-05-22 02:23:32,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 3.0282485875706215) internal successors, (1072), 354 states have internal predecessors, (1072), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:32,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 1072 transitions. [2021-05-22 02:23:32,632 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 1072 transitions. Word has length 21 [2021-05-22 02:23:32,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:32,632 INFO L482 AbstractCegarLoop]: Abstraction has 355 states and 1072 transitions. [2021-05-22 02:23:32,632 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:32,632 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 1072 transitions. [2021-05-22 02:23:32,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:32,632 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:32,632 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:32,833 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 203 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable575 [2021-05-22 02:23:32,833 INFO L430 AbstractCegarLoop]: === Iteration 215 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:32,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:32,833 INFO L82 PathProgramCache]: Analyzing trace with hash -2110462127, now seen corresponding path program 203 times [2021-05-22 02:23:32,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:32,833 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196496462] [2021-05-22 02:23:32,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:32,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:32,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:32,919 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:32,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196496462] [2021-05-22 02:23:32,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196496462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:32,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977295654] [2021-05-22 02:23:32,919 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 204 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 204 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:32,945 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:32,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:32,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:32,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:33,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:33,017 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:33,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:33,020 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,029 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:33,029 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:23:33,081 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:33,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:33,083 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,088 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,089 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:33,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:33,090 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,094 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,095 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,095 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:23:33,119 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:33,120 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [977295654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:33,120 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:33,120 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:33,120 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102995520] [2021-05-22 02:23:33,120 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:33,120 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:33,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:33,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:33,120 INFO L87 Difference]: Start difference. First operand 355 states and 1072 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:33,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:33,456 INFO L93 Difference]: Finished difference Result 536 states and 1604 transitions. [2021-05-22 02:23:33,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:23:33,456 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:33,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:33,457 INFO L225 Difference]: With dead ends: 536 [2021-05-22 02:23:33,457 INFO L226 Difference]: Without dead ends: 517 [2021-05-22 02:23:33,457 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 233.9ms TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:23:33,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-05-22 02:23:33,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 361. [2021-05-22 02:23:33,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 3.0305555555555554) internal successors, (1091), 360 states have internal predecessors, (1091), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:33,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 1091 transitions. [2021-05-22 02:23:33,461 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 1091 transitions. Word has length 21 [2021-05-22 02:23:33,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:33,461 INFO L482 AbstractCegarLoop]: Abstraction has 361 states and 1091 transitions. [2021-05-22 02:23:33,461 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:33,461 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 1091 transitions. [2021-05-22 02:23:33,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:33,462 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:33,462 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:33,662 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable583,204 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:33,662 INFO L430 AbstractCegarLoop]: === Iteration 216 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:33,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:33,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1962296557, now seen corresponding path program 204 times [2021-05-22 02:23:33,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:33,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815245603] [2021-05-22 02:23:33,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:33,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:33,744 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:33,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:33,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815245603] [2021-05-22 02:23:33,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815245603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:33,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043446458] [2021-05-22 02:23:33,744 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 205 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 205 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:33,770 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:33,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:33,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:33,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:33,828 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:33,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:33,829 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,836 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:33,836 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:23:33,914 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:33,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:33,919 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:33,922 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,935 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:33,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:33,938 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:33,950 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:33,952 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:33,952 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:49, output treesize:5 [2021-05-22 02:23:33,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:33,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043446458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:33,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:33,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:33,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122085445] [2021-05-22 02:23:33,982 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:33,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:33,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:33,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:33,982 INFO L87 Difference]: Start difference. First operand 361 states and 1091 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:34,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:34,284 INFO L93 Difference]: Finished difference Result 674 states and 1997 transitions. [2021-05-22 02:23:34,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:23:34,284 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:34,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:34,285 INFO L225 Difference]: With dead ends: 674 [2021-05-22 02:23:34,285 INFO L226 Difference]: Without dead ends: 614 [2021-05-22 02:23:34,285 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 242.9ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:23:34,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-05-22 02:23:34,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 366. [2021-05-22 02:23:34,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 365 states have (on average 3.0273972602739727) internal successors, (1105), 365 states have internal predecessors, (1105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:34,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 1105 transitions. [2021-05-22 02:23:34,290 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 1105 transitions. Word has length 21 [2021-05-22 02:23:34,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:34,290 INFO L482 AbstractCegarLoop]: Abstraction has 366 states and 1105 transitions. [2021-05-22 02:23:34,290 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:34,290 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 1105 transitions. [2021-05-22 02:23:34,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:34,290 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:34,290 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:34,491 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable589,205 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:34,491 INFO L430 AbstractCegarLoop]: === Iteration 217 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:34,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:34,491 INFO L82 PathProgramCache]: Analyzing trace with hash -424070287, now seen corresponding path program 205 times [2021-05-22 02:23:34,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:34,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599515907] [2021-05-22 02:23:34,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:34,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:34,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:34,575 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:34,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599515907] [2021-05-22 02:23:34,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599515907] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:34,575 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505658048] [2021-05-22 02:23:34,575 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 206 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 206 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:34,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:34,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:34,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:34,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:34,675 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:34,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:34,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:34,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:34,679 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:34,688 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:34,689 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:34,689 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:23:34,720 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4, v_prenex_14], 1=[v_prenex_13]} [2021-05-22 02:23:34,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:34,723 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:34,733 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:34,733 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:34,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:34,735 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:34,744 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:34,746 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:34,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:34,746 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:34,754 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:34,755 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:34,755 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:23:34,798 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:34,798 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505658048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:34,798 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:34,798 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:34,798 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425617529] [2021-05-22 02:23:34,799 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:34,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:34,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:34,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:34,799 INFO L87 Difference]: Start difference. First operand 366 states and 1105 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:35,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:35,154 INFO L93 Difference]: Finished difference Result 611 states and 1840 transitions. [2021-05-22 02:23:35,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:23:35,155 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:35,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:35,156 INFO L225 Difference]: With dead ends: 611 [2021-05-22 02:23:35,156 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:23:35,156 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 231.3ms TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:23:35,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:23:35,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 362. [2021-05-22 02:23:35,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 362 states, 361 states have (on average 3.027700831024931) internal successors, (1093), 361 states have internal predecessors, (1093), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:35,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 362 states to 362 states and 1093 transitions. [2021-05-22 02:23:35,160 INFO L78 Accepts]: Start accepts. Automaton has 362 states and 1093 transitions. Word has length 21 [2021-05-22 02:23:35,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:35,160 INFO L482 AbstractCegarLoop]: Abstraction has 362 states and 1093 transitions. [2021-05-22 02:23:35,160 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:35,160 INFO L276 IsEmpty]: Start isEmpty. Operand 362 states and 1093 transitions. [2021-05-22 02:23:35,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:35,161 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:35,161 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:35,361 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 206 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable597 [2021-05-22 02:23:35,361 INFO L430 AbstractCegarLoop]: === Iteration 218 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:35,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:35,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1309868567, now seen corresponding path program 206 times [2021-05-22 02:23:35,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:35,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1975937160] [2021-05-22 02:23:35,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:35,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:35,459 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:35,460 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:35,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1975937160] [2021-05-22 02:23:35,460 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1975937160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:35,460 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177644325] [2021-05-22 02:23:35,460 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 207 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 207 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:35,486 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:35,486 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:35,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:35,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:35,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:35,543 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:35,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:35,548 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:35,548 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:23 [2021-05-22 02:23:35,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:35,584 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:35,586 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:35,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:35,587 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:35,595 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:35,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:35,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:35,597 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:35,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:35,606 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:35,606 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:47, output treesize:13 [2021-05-22 02:23:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:35,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177644325] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:35,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:35,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:35,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747165408] [2021-05-22 02:23:35,651 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:35,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:35,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:35,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:35,652 INFO L87 Difference]: Start difference. First operand 362 states and 1093 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:36,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:36,245 INFO L93 Difference]: Finished difference Result 704 states and 2089 transitions. [2021-05-22 02:23:36,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-22 02:23:36,245 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:36,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:36,246 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:23:36,246 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:23:36,247 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 483.6ms TimeCoverageRelationStatistics Valid=180, Invalid=876, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:23:36,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:23:36,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 363. [2021-05-22 02:23:36,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 362 states have (on average 3.0331491712707184) internal successors, (1098), 362 states have internal predecessors, (1098), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:36,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 1098 transitions. [2021-05-22 02:23:36,251 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 1098 transitions. Word has length 21 [2021-05-22 02:23:36,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:36,251 INFO L482 AbstractCegarLoop]: Abstraction has 363 states and 1098 transitions. [2021-05-22 02:23:36,251 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:36,251 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 1098 transitions. [2021-05-22 02:23:36,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:36,252 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:36,252 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:36,452 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 207 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable605 [2021-05-22 02:23:36,452 INFO L430 AbstractCegarLoop]: === Iteration 219 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:36,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:36,453 INFO L82 PathProgramCache]: Analyzing trace with hash -1594131251, now seen corresponding path program 207 times [2021-05-22 02:23:36,453 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:36,453 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200523163] [2021-05-22 02:23:36,453 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:36,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:36,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:36,540 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:36,540 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200523163] [2021-05-22 02:23:36,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200523163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:36,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027600350] [2021-05-22 02:23:36,541 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 208 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 208 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:36,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:36,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:36,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:23:36,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:36,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:36,652 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,654 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:23:36,654 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:23:36,657 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:36,660 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,674 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:36,675 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:23:36,675 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:109, output treesize:57 [2021-05-22 02:23:36,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,721 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:36,722 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:36,725 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:23:36,728 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,747 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:36,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:36,751 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:36,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:23:36,754 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:36,772 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:36,773 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:23:36,773 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 3 variables, input treesize:99, output treesize:26 [2021-05-22 02:23:36,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:36,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027600350] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:36,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:36,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:36,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699779854] [2021-05-22 02:23:36,855 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:36,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:36,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:36,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:36,856 INFO L87 Difference]: Start difference. First operand 363 states and 1098 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:37,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:37,557 INFO L93 Difference]: Finished difference Result 703 states and 2073 transitions. [2021-05-22 02:23:37,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:23:37,558 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:37,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:37,559 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:23:37,559 INFO L226 Difference]: Without dead ends: 649 [2021-05-22 02:23:37,559 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 676.2ms TimeCoverageRelationStatistics Valid=179, Invalid=813, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:23:37,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 649 states. [2021-05-22 02:23:37,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 649 to 378. [2021-05-22 02:23:37,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 378 states, 377 states have (on average 3.029177718832891) internal successors, (1142), 377 states have internal predecessors, (1142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:37,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 1142 transitions. [2021-05-22 02:23:37,563 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 1142 transitions. Word has length 21 [2021-05-22 02:23:37,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:37,564 INFO L482 AbstractCegarLoop]: Abstraction has 378 states and 1142 transitions. [2021-05-22 02:23:37,564 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:37,564 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 1142 transitions. [2021-05-22 02:23:37,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:37,564 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:37,564 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:37,764 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable611,208 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:37,765 INFO L430 AbstractCegarLoop]: === Iteration 220 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:37,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:37,765 INFO L82 PathProgramCache]: Analyzing trace with hash 92260589, now seen corresponding path program 208 times [2021-05-22 02:23:37,765 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:37,765 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561691141] [2021-05-22 02:23:37,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:37,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:37,846 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:37,846 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:37,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561691141] [2021-05-22 02:23:37,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561691141] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:37,846 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551680803] [2021-05-22 02:23:37,846 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 209 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 209 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:37,873 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:37,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:37,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:37,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:37,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:37,957 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:37,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:37,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:37,969 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:37,970 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:37,970 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:45, output treesize:29 [2021-05-22 02:23:38,014 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:38,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:38,015 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,020 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:38,022 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:38,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:38,023 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:38,029 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,029 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:7 [2021-05-22 02:23:38,058 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:38,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551680803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:38,058 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:38,058 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:38,058 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528182086] [2021-05-22 02:23:38,058 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:38,058 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:38,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:38,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:38,058 INFO L87 Difference]: Start difference. First operand 378 states and 1142 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:38,305 INFO L93 Difference]: Finished difference Result 536 states and 1594 transitions. [2021-05-22 02:23:38,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:23:38,305 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:38,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:38,306 INFO L225 Difference]: With dead ends: 536 [2021-05-22 02:23:38,306 INFO L226 Difference]: Without dead ends: 515 [2021-05-22 02:23:38,306 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 270.1ms TimeCoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:23:38,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-05-22 02:23:38,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 372. [2021-05-22 02:23:38,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 372 states, 371 states have (on average 3.0377358490566038) internal successors, (1127), 371 states have internal predecessors, (1127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 1127 transitions. [2021-05-22 02:23:38,310 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 1127 transitions. Word has length 21 [2021-05-22 02:23:38,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:38,310 INFO L482 AbstractCegarLoop]: Abstraction has 372 states and 1127 transitions. [2021-05-22 02:23:38,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,310 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 1127 transitions. [2021-05-22 02:23:38,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:38,310 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:38,310 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:38,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 209 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable620 [2021-05-22 02:23:38,511 INFO L430 AbstractCegarLoop]: === Iteration 221 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:38,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:38,511 INFO L82 PathProgramCache]: Analyzing trace with hash 77948227, now seen corresponding path program 209 times [2021-05-22 02:23:38,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:38,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [441509650] [2021-05-22 02:23:38,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:38,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:38,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:38,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:38,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [441509650] [2021-05-22 02:23:38,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [441509650] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:38,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [258032897] [2021-05-22 02:23:38,578 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 210 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 210 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:38,609 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:38,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:38,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:38,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:38,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:38,630 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:38,633 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:38,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:38,639 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:23:38,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:38,661 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,663 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:38,663 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:38,664 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:38,664 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:38,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:38,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [258032897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:38,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:38,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:38,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151505864] [2021-05-22 02:23:38,672 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:38,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:38,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:38,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:38,672 INFO L87 Difference]: Start difference. First operand 372 states and 1127 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:38,781 INFO L93 Difference]: Finished difference Result 695 states and 2077 transitions. [2021-05-22 02:23:38,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:38,782 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:38,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:38,783 INFO L225 Difference]: With dead ends: 695 [2021-05-22 02:23:38,783 INFO L226 Difference]: Without dead ends: 673 [2021-05-22 02:23:38,783 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 86.1ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:38,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-22 02:23:38,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 376. [2021-05-22 02:23:38,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 376 states, 375 states have (on average 3.048) internal successors, (1143), 375 states have internal predecessors, (1143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 376 states to 376 states and 1143 transitions. [2021-05-22 02:23:38,788 INFO L78 Accepts]: Start accepts. Automaton has 376 states and 1143 transitions. Word has length 21 [2021-05-22 02:23:38,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:38,788 INFO L482 AbstractCegarLoop]: Abstraction has 376 states and 1143 transitions. [2021-05-22 02:23:38,788 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:38,788 INFO L276 IsEmpty]: Start isEmpty. Operand 376 states and 1143 transitions. [2021-05-22 02:23:38,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:38,788 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:38,788 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:38,989 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 210 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable623 [2021-05-22 02:23:38,989 INFO L430 AbstractCegarLoop]: === Iteration 222 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:38,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:38,989 INFO L82 PathProgramCache]: Analyzing trace with hash -2011840595, now seen corresponding path program 210 times [2021-05-22 02:23:38,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:38,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459530364] [2021-05-22 02:23:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:38,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:39,076 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:39,076 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:39,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459530364] [2021-05-22 02:23:39,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459530364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:39,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117913750] [2021-05-22 02:23:39,076 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 211 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 211 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:39,105 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:39,105 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:39,105 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:39,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:39,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:39,152 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:39,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:39,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:39,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:39,162 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:39,163 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:39,163 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:23:39,263 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:39,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:39,265 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:39,270 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:39,271 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:39,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:39,272 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:39,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:39,278 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:39,278 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:23:39,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:39,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117913750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:39,303 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:39,303 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:39,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424436707] [2021-05-22 02:23:39,303 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:39,304 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:39,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:39,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:39,304 INFO L87 Difference]: Start difference. First operand 376 states and 1143 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:40,045 INFO L93 Difference]: Finished difference Result 849 states and 2499 transitions. [2021-05-22 02:23:40,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-22 02:23:40,045 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:40,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:40,046 INFO L225 Difference]: With dead ends: 849 [2021-05-22 02:23:40,046 INFO L226 Difference]: Without dead ends: 830 [2021-05-22 02:23:40,046 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 296 ImplicationChecksByTransitivity, 535.7ms TimeCoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:23:40,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 830 states. [2021-05-22 02:23:40,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 830 to 381. [2021-05-22 02:23:40,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 380 states have (on average 3.068421052631579) internal successors, (1166), 380 states have internal predecessors, (1166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 1166 transitions. [2021-05-22 02:23:40,051 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 1166 transitions. Word has length 21 [2021-05-22 02:23:40,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:40,051 INFO L482 AbstractCegarLoop]: Abstraction has 381 states and 1166 transitions. [2021-05-22 02:23:40,052 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,052 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 1166 transitions. [2021-05-22 02:23:40,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:40,052 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:40,052 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:40,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable626,211 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:40,269 INFO L430 AbstractCegarLoop]: === Iteration 223 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:40,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:40,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1055075473, now seen corresponding path program 211 times [2021-05-22 02:23:40,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:40,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26345296] [2021-05-22 02:23:40,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:40,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:40,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:40,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:40,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26345296] [2021-05-22 02:23:40,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26345296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:40,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842263737] [2021-05-22 02:23:40,348 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 212 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 212 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:40,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:40,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:40,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:40,401 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:40,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:40,402 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:40,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:40,408 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:40,409 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:23:40,506 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:40,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:40,508 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:40,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:40,511 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:40,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:40,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:40,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:40,522 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:40,530 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:40,531 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:40,531 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:49, output treesize:5 [2021-05-22 02:23:40,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:40,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842263737] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:40,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:40,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:40,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605983539] [2021-05-22 02:23:40,557 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:40,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:40,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:40,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:40,558 INFO L87 Difference]: Start difference. First operand 381 states and 1166 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:40,959 INFO L93 Difference]: Finished difference Result 771 states and 2289 transitions. [2021-05-22 02:23:40,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:23:40,959 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:40,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:40,960 INFO L225 Difference]: With dead ends: 771 [2021-05-22 02:23:40,960 INFO L226 Difference]: Without dead ends: 732 [2021-05-22 02:23:40,960 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 334.8ms TimeCoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:23:40,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 732 states. [2021-05-22 02:23:40,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 732 to 383. [2021-05-22 02:23:40,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 382 states have (on average 3.068062827225131) internal successors, (1172), 382 states have internal predecessors, (1172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 1172 transitions. [2021-05-22 02:23:40,968 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 1172 transitions. Word has length 21 [2021-05-22 02:23:40,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:40,968 INFO L482 AbstractCegarLoop]: Abstraction has 383 states and 1172 transitions. [2021-05-22 02:23:40,968 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:40,968 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 1172 transitions. [2021-05-22 02:23:40,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:40,969 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:40,969 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:41,182 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 212 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable635 [2021-05-22 02:23:41,183 INFO L430 AbstractCegarLoop]: === Iteration 224 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:41,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:41,183 INFO L82 PathProgramCache]: Analyzing trace with hash 340426509, now seen corresponding path program 212 times [2021-05-22 02:23:41,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:41,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442832755] [2021-05-22 02:23:41,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:41,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:41,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:41,266 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:41,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442832755] [2021-05-22 02:23:41,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442832755] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:41,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956611197] [2021-05-22 02:23:41,267 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 213 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 213 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:41,292 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:41,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:41,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:41,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:41,334 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:41,335 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:41,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:41,336 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:41,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:41,339 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:41,347 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:41,348 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:41,348 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:23:41,462 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:23:41,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:41,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:41,469 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:41,471 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:41,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:41,472 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:41,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:41,477 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:41,477 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:23:41,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:41,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956611197] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:41,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:41,503 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:41,503 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161618878] [2021-05-22 02:23:41,503 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:41,503 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:41,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:41,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:41,503 INFO L87 Difference]: Start difference. First operand 383 states and 1172 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:42,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:42,013 INFO L93 Difference]: Finished difference Result 787 states and 2357 transitions. [2021-05-22 02:23:42,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:23:42,013 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:42,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:42,014 INFO L225 Difference]: With dead ends: 787 [2021-05-22 02:23:42,014 INFO L226 Difference]: Without dead ends: 768 [2021-05-22 02:23:42,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 412.6ms TimeCoverageRelationStatistics Valid=148, Invalid=664, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:23:42,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2021-05-22 02:23:42,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 385. [2021-05-22 02:23:42,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 3.0651041666666665) internal successors, (1177), 384 states have internal predecessors, (1177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:42,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 1177 transitions. [2021-05-22 02:23:42,019 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 1177 transitions. Word has length 21 [2021-05-22 02:23:42,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:42,019 INFO L482 AbstractCegarLoop]: Abstraction has 385 states and 1177 transitions. [2021-05-22 02:23:42,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:42,019 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 1177 transitions. [2021-05-22 02:23:42,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:42,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:42,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:42,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable643,213 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:42,220 INFO L430 AbstractCegarLoop]: === Iteration 225 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:42,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:42,220 INFO L82 PathProgramCache]: Analyzing trace with hash 2026818349, now seen corresponding path program 213 times [2021-05-22 02:23:42,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:42,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820738918] [2021-05-22 02:23:42,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:42,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:42,311 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:42,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820738918] [2021-05-22 02:23:42,311 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820738918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:42,311 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47851992] [2021-05-22 02:23:42,311 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 214 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 214 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:42,337 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:42,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:42,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:42,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:42,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:42,380 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:42,381 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:42,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:42,382 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:42,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:42,392 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:42,392 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:23:42,478 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4, v_prenex_16], 1=[v_prenex_15]} [2021-05-22 02:23:42,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:42,481 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:42,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:42,491 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:42,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:42,493 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:42,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:42,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:42,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:42,504 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:42,512 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:42,513 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:42,513 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:23:42,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:42,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47851992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:42,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:42,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:42,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2074056647] [2021-05-22 02:23:42,557 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:42,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:42,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:42,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:42,557 INFO L87 Difference]: Start difference. First operand 385 states and 1177 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:43,102 INFO L93 Difference]: Finished difference Result 819 states and 2450 transitions. [2021-05-22 02:23:43,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:23:43,103 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:43,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:43,104 INFO L225 Difference]: With dead ends: 819 [2021-05-22 02:23:43,104 INFO L226 Difference]: Without dead ends: 796 [2021-05-22 02:23:43,104 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 466.1ms TimeCoverageRelationStatistics Valid=155, Invalid=715, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:23:43,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 796 states. [2021-05-22 02:23:43,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 796 to 382. [2021-05-22 02:23:43,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 382 states, 381 states have (on average 3.078740157480315) internal successors, (1173), 381 states have internal predecessors, (1173), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 1173 transitions. [2021-05-22 02:23:43,109 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 1173 transitions. Word has length 21 [2021-05-22 02:23:43,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:43,109 INFO L482 AbstractCegarLoop]: Abstraction has 382 states and 1173 transitions. [2021-05-22 02:23:43,109 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,109 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 1173 transitions. [2021-05-22 02:23:43,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:43,110 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:43,110 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:43,310 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 214 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable652 [2021-05-22 02:23:43,310 INFO L430 AbstractCegarLoop]: === Iteration 226 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:43,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:43,310 INFO L82 PathProgramCache]: Analyzing trace with hash -1604188087, now seen corresponding path program 214 times [2021-05-22 02:23:43,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:43,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376659427] [2021-05-22 02:23:43,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:43,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:43,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:43,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:43,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376659427] [2021-05-22 02:23:43,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376659427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:43,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1789151743] [2021-05-22 02:23:43,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 215 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 215 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:43,408 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:43,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:43,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:43,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:43,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:43,431 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:43,433 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,440 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:43,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:43,440 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:23:43,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:43,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:43,467 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:43,467 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,467 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:43,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:43,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1789151743] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:43,475 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:43,475 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:43,475 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998080153] [2021-05-22 02:23:43,475 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:43,475 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:43,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:43,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:43,476 INFO L87 Difference]: Start difference. First operand 382 states and 1173 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:43,645 INFO L93 Difference]: Finished difference Result 624 states and 1883 transitions. [2021-05-22 02:23:43,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:43,645 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:43,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:43,646 INFO L225 Difference]: With dead ends: 624 [2021-05-22 02:23:43,646 INFO L226 Difference]: Without dead ends: 602 [2021-05-22 02:23:43,646 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 104.6ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:43,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2021-05-22 02:23:43,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 385. [2021-05-22 02:23:43,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 3.0755208333333335) internal successors, (1181), 384 states have internal predecessors, (1181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 1181 transitions. [2021-05-22 02:23:43,651 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 1181 transitions. Word has length 21 [2021-05-22 02:23:43,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:43,651 INFO L482 AbstractCegarLoop]: Abstraction has 385 states and 1181 transitions. [2021-05-22 02:23:43,651 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:43,651 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 1181 transitions. [2021-05-22 02:23:43,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:43,651 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:43,651 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:43,851 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable665,215 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:43,852 INFO L430 AbstractCegarLoop]: === Iteration 227 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:43,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:43,852 INFO L82 PathProgramCache]: Analyzing trace with hash 276564851, now seen corresponding path program 215 times [2021-05-22 02:23:43,852 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:43,852 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462985367] [2021-05-22 02:23:43,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:43,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:43,923 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:43,924 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:43,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462985367] [2021-05-22 02:23:43,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [462985367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:43,924 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126175499] [2021-05-22 02:23:43,924 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 216 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 216 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:43,950 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:43,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:43,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:43,951 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:43,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:43,972 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:43,975 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:43,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:43,981 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:43,981 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:23:44,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:44,003 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:44,005 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,011 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:44,011 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:44,012 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:44,012 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:23:44,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:44,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126175499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:44,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:44,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:23:44,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795673179] [2021-05-22 02:23:44,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:23:44,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:44,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:23:44,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:23:44,029 INFO L87 Difference]: Start difference. First operand 385 states and 1181 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:44,152 INFO L93 Difference]: Finished difference Result 630 states and 1896 transitions. [2021-05-22 02:23:44,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:44,153 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:44,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:44,154 INFO L225 Difference]: With dead ends: 630 [2021-05-22 02:23:44,154 INFO L226 Difference]: Without dead ends: 601 [2021-05-22 02:23:44,154 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 110.4ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:44,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-22 02:23:44,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 385. [2021-05-22 02:23:44,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 3.0755208333333335) internal successors, (1181), 384 states have internal predecessors, (1181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 1181 transitions. [2021-05-22 02:23:44,158 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 1181 transitions. Word has length 21 [2021-05-22 02:23:44,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:44,159 INFO L482 AbstractCegarLoop]: Abstraction has 385 states and 1181 transitions. [2021-05-22 02:23:44,159 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,159 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 1181 transitions. [2021-05-22 02:23:44,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:44,159 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:44,159 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:44,359 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable669,216 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:44,360 INFO L430 AbstractCegarLoop]: === Iteration 228 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:44,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:44,360 INFO L82 PathProgramCache]: Analyzing trace with hash -2024311991, now seen corresponding path program 216 times [2021-05-22 02:23:44,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:44,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [499296872] [2021-05-22 02:23:44,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:44,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:44,444 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:44,444 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:44,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [499296872] [2021-05-22 02:23:44,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [499296872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:44,444 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104395750] [2021-05-22 02:23:44,444 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 217 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 217 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:44,475 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:44,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:44,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:44,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:44,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:44,530 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,535 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:44,536 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,536 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:23:44,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:44,564 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:44,567 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:44,567 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:44,567 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:44,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:44,575 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104395750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:44,575 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:44,575 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:44,575 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274303078] [2021-05-22 02:23:44,576 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:44,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:44,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:44,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:44,576 INFO L87 Difference]: Start difference. First operand 385 states and 1181 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:44,719 INFO L93 Difference]: Finished difference Result 520 states and 1575 transitions. [2021-05-22 02:23:44,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:44,719 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:44,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:44,720 INFO L225 Difference]: With dead ends: 520 [2021-05-22 02:23:44,720 INFO L226 Difference]: Without dead ends: 498 [2021-05-22 02:23:44,720 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 123.0ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:44,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2021-05-22 02:23:44,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 391. [2021-05-22 02:23:44,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 3.082051282051282) internal successors, (1202), 390 states have internal predecessors, (1202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 1202 transitions. [2021-05-22 02:23:44,725 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 1202 transitions. Word has length 21 [2021-05-22 02:23:44,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:44,725 INFO L482 AbstractCegarLoop]: Abstraction has 391 states and 1202 transitions. [2021-05-22 02:23:44,725 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:44,725 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 1202 transitions. [2021-05-22 02:23:44,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:44,725 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:44,725 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:44,925 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 217 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable674 [2021-05-22 02:23:44,926 INFO L430 AbstractCegarLoop]: === Iteration 229 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:44,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:44,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1768863969, now seen corresponding path program 217 times [2021-05-22 02:23:44,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:44,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248587753] [2021-05-22 02:23:44,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:44,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:45,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:45,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:45,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248587753] [2021-05-22 02:23:45,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248587753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:45,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743165205] [2021-05-22 02:23:45,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 218 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 218 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:45,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:45,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:45,037 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:45,138 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:45,139 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,147 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:45,150 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:32 [2021-05-22 02:23:45,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:45,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,186 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:23:45,188 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,196 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,196 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,196 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:23:45,209 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:45,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743165205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:45,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:45,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:45,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406185825] [2021-05-22 02:23:45,210 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:45,210 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:45,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:45,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:45,210 INFO L87 Difference]: Start difference. First operand 391 states and 1202 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:45,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:45,365 INFO L93 Difference]: Finished difference Result 511 states and 1551 transitions. [2021-05-22 02:23:45,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:45,365 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:45,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:45,366 INFO L225 Difference]: With dead ends: 511 [2021-05-22 02:23:45,366 INFO L226 Difference]: Without dead ends: 489 [2021-05-22 02:23:45,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 150.3ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:45,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 489 states. [2021-05-22 02:23:45,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 489 to 388. [2021-05-22 02:23:45,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 388 states, 387 states have (on average 3.0749354005167957) internal successors, (1190), 387 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:45,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 388 states to 388 states and 1190 transitions. [2021-05-22 02:23:45,370 INFO L78 Accepts]: Start accepts. Automaton has 388 states and 1190 transitions. Word has length 21 [2021-05-22 02:23:45,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:45,370 INFO L482 AbstractCegarLoop]: Abstraction has 388 states and 1190 transitions. [2021-05-22 02:23:45,370 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:45,370 INFO L276 IsEmpty]: Start isEmpty. Operand 388 states and 1190 transitions. [2021-05-22 02:23:45,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:45,371 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:45,371 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:45,571 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable677,218 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:45,571 INFO L430 AbstractCegarLoop]: === Iteration 230 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:45,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:45,572 INFO L82 PathProgramCache]: Analyzing trace with hash -337920151, now seen corresponding path program 218 times [2021-05-22 02:23:45,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:45,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1637168188] [2021-05-22 02:23:45,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:45,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:45,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:45,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:45,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1637168188] [2021-05-22 02:23:45,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1637168188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:45,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219982125] [2021-05-22 02:23:45,667 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 219 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 219 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:45,700 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:45,700 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:45,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:45,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:45,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:45,831 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,837 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,838 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:45,838 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:23:45,863 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:45,865 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,873 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,875 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:45,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:23:45,875 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:45,884 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:45,884 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:23:45,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:45,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219982125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:45,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:45,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:45,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383400558] [2021-05-22 02:23:45,903 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:45,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:45,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:45,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:45,904 INFO L87 Difference]: Start difference. First operand 388 states and 1190 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:46,095 INFO L93 Difference]: Finished difference Result 514 states and 1557 transitions. [2021-05-22 02:23:46,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:46,095 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:46,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:46,096 INFO L225 Difference]: With dead ends: 514 [2021-05-22 02:23:46,096 INFO L226 Difference]: Without dead ends: 492 [2021-05-22 02:23:46,096 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 199.6ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:46,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2021-05-22 02:23:46,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 385. [2021-05-22 02:23:46,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 3.0755208333333335) internal successors, (1181), 384 states have internal predecessors, (1181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 1181 transitions. [2021-05-22 02:23:46,100 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 1181 transitions. Word has length 21 [2021-05-22 02:23:46,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:46,100 INFO L482 AbstractCegarLoop]: Abstraction has 385 states and 1181 transitions. [2021-05-22 02:23:46,100 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,100 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 1181 transitions. [2021-05-22 02:23:46,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:46,101 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:46,101 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:46,301 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 219 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable680 [2021-05-22 02:23:46,301 INFO L430 AbstractCegarLoop]: === Iteration 231 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:46,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:46,301 INFO L82 PathProgramCache]: Analyzing trace with hash 1394832891, now seen corresponding path program 219 times [2021-05-22 02:23:46,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:46,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [748966024] [2021-05-22 02:23:46,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:46,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:46,385 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:46,386 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:46,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [748966024] [2021-05-22 02:23:46,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [748966024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:46,386 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579658232] [2021-05-22 02:23:46,386 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 220 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 220 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:46,411 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:46,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:46,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:46,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:46,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:46,455 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:46,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:46,458 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:46,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:46,467 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:46,467 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:46,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:46,525 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:46,528 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:46,528 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:46,528 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:46,528 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:23:46,536 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:46,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579658232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:46,536 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:46,536 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:46,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006630602] [2021-05-22 02:23:46,537 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:46,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:46,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:46,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:46,537 INFO L87 Difference]: Start difference. First operand 385 states and 1181 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:46,638 INFO L93 Difference]: Finished difference Result 532 states and 1614 transitions. [2021-05-22 02:23:46,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:46,639 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:46,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:46,639 INFO L225 Difference]: With dead ends: 532 [2021-05-22 02:23:46,640 INFO L226 Difference]: Without dead ends: 510 [2021-05-22 02:23:46,640 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 131.2ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:46,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 510 states. [2021-05-22 02:23:46,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 510 to 392. [2021-05-22 02:23:46,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 392 states, 391 states have (on average 3.0920716112531967) internal successors, (1209), 391 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 1209 transitions. [2021-05-22 02:23:46,644 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 1209 transitions. Word has length 21 [2021-05-22 02:23:46,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:46,644 INFO L482 AbstractCegarLoop]: Abstraction has 392 states and 1209 transitions. [2021-05-22 02:23:46,644 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:46,644 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 1209 transitions. [2021-05-22 02:23:46,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:46,645 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:46,645 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:46,845 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 220 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable683 [2021-05-22 02:23:46,845 INFO L430 AbstractCegarLoop]: === Iteration 232 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:46,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:46,845 INFO L82 PathProgramCache]: Analyzing trace with hash 893041555, now seen corresponding path program 220 times [2021-05-22 02:23:46,846 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:46,846 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1954603992] [2021-05-22 02:23:46,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:46,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:46,930 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:46,930 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:46,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1954603992] [2021-05-22 02:23:46,930 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1954603992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:46,930 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928129813] [2021-05-22 02:23:46,930 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 221 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 221 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:46,956 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:46,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:46,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:46,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:47,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:47,021 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:47,023 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,032 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:47,033 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:47,033 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:47,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:47,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,072 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:47,072 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:47,073 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,073 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:23:47,085 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:47,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928129813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:47,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:47,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:47,086 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136332572] [2021-05-22 02:23:47,086 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:47,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:47,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:47,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:47,086 INFO L87 Difference]: Start difference. First operand 392 states and 1209 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:47,239 INFO L93 Difference]: Finished difference Result 523 states and 1590 transitions. [2021-05-22 02:23:47,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:47,240 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:47,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:47,240 INFO L225 Difference]: With dead ends: 523 [2021-05-22 02:23:47,240 INFO L226 Difference]: Without dead ends: 501 [2021-05-22 02:23:47,241 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 123.6ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:47,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-05-22 02:23:47,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 389. [2021-05-22 02:23:47,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 3.0850515463917527) internal successors, (1197), 388 states have internal predecessors, (1197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 1197 transitions. [2021-05-22 02:23:47,245 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 1197 transitions. Word has length 21 [2021-05-22 02:23:47,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:47,245 INFO L482 AbstractCegarLoop]: Abstraction has 389 states and 1197 transitions. [2021-05-22 02:23:47,245 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,245 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 1197 transitions. [2021-05-22 02:23:47,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:47,246 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:47,246 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:47,446 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable687,221 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:47,447 INFO L430 AbstractCegarLoop]: === Iteration 233 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:47,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:47,447 INFO L82 PathProgramCache]: Analyzing trace with hash 2020157009, now seen corresponding path program 221 times [2021-05-22 02:23:47,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:47,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298771120] [2021-05-22 02:23:47,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:47,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:47,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:47,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:47,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298771120] [2021-05-22 02:23:47,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298771120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:47,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205048706] [2021-05-22 02:23:47,524 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 222 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 222 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:47,550 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:47,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:47,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:47,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:47,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:47,596 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:47,598 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,606 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:47,607 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:47,607 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:47,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:47,664 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,666 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:47,666 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:47,667 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:47,667 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:23:47,675 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:47,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205048706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:47,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:47,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:47,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99802] [2021-05-22 02:23:47,675 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:47,675 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:47,675 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:47,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:47,676 INFO L87 Difference]: Start difference. First operand 389 states and 1197 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:47,838 INFO L93 Difference]: Finished difference Result 507 states and 1529 transitions. [2021-05-22 02:23:47,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:47,838 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:47,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:47,839 INFO L225 Difference]: With dead ends: 507 [2021-05-22 02:23:47,839 INFO L226 Difference]: Without dead ends: 488 [2021-05-22 02:23:47,839 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 139.9ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:47,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-05-22 02:23:47,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 395. [2021-05-22 02:23:47,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 394 states have (on average 3.0964467005076144) internal successors, (1220), 394 states have internal predecessors, (1220), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 1220 transitions. [2021-05-22 02:23:47,843 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 1220 transitions. Word has length 21 [2021-05-22 02:23:47,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:47,843 INFO L482 AbstractCegarLoop]: Abstraction has 395 states and 1220 transitions. [2021-05-22 02:23:47,843 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:47,843 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 1220 transitions. [2021-05-22 02:23:47,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:47,844 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:47,844 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:48,044 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable691,222 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:48,044 INFO L430 AbstractCegarLoop]: === Iteration 234 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:48,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:48,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1797948397, now seen corresponding path program 222 times [2021-05-22 02:23:48,045 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:48,045 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291527482] [2021-05-22 02:23:48,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:48,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:48,115 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:48,115 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:48,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291527482] [2021-05-22 02:23:48,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1291527482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:48,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1171389664] [2021-05-22 02:23:48,115 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 223 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 223 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:48,141 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:48,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:48,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:48,142 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:48,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:48,176 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,180 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:48,181 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,181 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:48,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:48,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:48,233 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,235 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:48,235 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:48,235 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:48,235 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:23:48,243 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:48,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1171389664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:48,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:48,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:23:48,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813152397] [2021-05-22 02:23:48,243 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:23:48,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:48,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:23:48,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:48,243 INFO L87 Difference]: Start difference. First operand 395 states and 1220 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:48,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:48,381 INFO L93 Difference]: Finished difference Result 516 states and 1563 transitions. [2021-05-22 02:23:48,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:48,381 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:48,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:48,382 INFO L225 Difference]: With dead ends: 516 [2021-05-22 02:23:48,382 INFO L226 Difference]: Without dead ends: 483 [2021-05-22 02:23:48,382 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 108.3ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:48,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-22 02:23:48,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 395. [2021-05-22 02:23:48,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 394 states have (on average 3.083756345177665) internal successors, (1215), 394 states have internal predecessors, (1215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:48,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 1215 transitions. [2021-05-22 02:23:48,387 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 1215 transitions. Word has length 21 [2021-05-22 02:23:48,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:48,387 INFO L482 AbstractCegarLoop]: Abstraction has 395 states and 1215 transitions. [2021-05-22 02:23:48,388 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:48,388 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 1215 transitions. [2021-05-22 02:23:48,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:48,388 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:48,388 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:48,600 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 223 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable697 [2021-05-22 02:23:48,600 INFO L430 AbstractCegarLoop]: === Iteration 235 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:48,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:48,600 INFO L82 PathProgramCache]: Analyzing trace with hash -588418447, now seen corresponding path program 223 times [2021-05-22 02:23:48,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:48,600 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340023423] [2021-05-22 02:23:48,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:48,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:48,693 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:48,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:48,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340023423] [2021-05-22 02:23:48,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [340023423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:48,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [783737547] [2021-05-22 02:23:48,694 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 224 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 224 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:48,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:48,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:48,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:48,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:48,800 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,803 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:48,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:48,804 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:48,829 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:48,830 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:23:48,952 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_18, v_prenex_17]} [2021-05-22 02:23:48,954 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:48,955 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,974 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:48,974 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:48,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:48,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:48,977 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:48,988 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:48,990 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:48,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:48,991 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:49,001 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:49,002 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:49,002 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:51, output treesize:13 [2021-05-22 02:23:49,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:49,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [783737547] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:49,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:49,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:49,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [101371278] [2021-05-22 02:23:49,047 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:49,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:49,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:49,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:49,047 INFO L87 Difference]: Start difference. First operand 395 states and 1215 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:49,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:49,467 INFO L93 Difference]: Finished difference Result 683 states and 2051 transitions. [2021-05-22 02:23:49,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:23:49,467 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:49,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:49,468 INFO L225 Difference]: With dead ends: 683 [2021-05-22 02:23:49,468 INFO L226 Difference]: Without dead ends: 660 [2021-05-22 02:23:49,468 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 292.4ms TimeCoverageRelationStatistics Valid=85, Invalid=421, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:23:49,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-22 02:23:49,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 407. [2021-05-22 02:23:49,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 3.0935960591133007) internal successors, (1256), 406 states have internal predecessors, (1256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:49,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 1256 transitions. [2021-05-22 02:23:49,473 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 1256 transitions. Word has length 21 [2021-05-22 02:23:49,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:49,473 INFO L482 AbstractCegarLoop]: Abstraction has 407 states and 1256 transitions. [2021-05-22 02:23:49,473 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:49,473 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 1256 transitions. [2021-05-22 02:23:49,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:49,473 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:49,473 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:49,673 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 224 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable700 [2021-05-22 02:23:49,674 INFO L430 AbstractCegarLoop]: === Iteration 236 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:49,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:49,674 INFO L82 PathProgramCache]: Analyzing trace with hash -872681131, now seen corresponding path program 224 times [2021-05-22 02:23:49,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:49,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577847297] [2021-05-22 02:23:49,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:49,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:49,747 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:49,747 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:49,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577847297] [2021-05-22 02:23:49,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577847297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:49,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661639525] [2021-05-22 02:23:49,748 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 225 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 225 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:49,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:49,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:49,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:49,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:49,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:49,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:49,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:49,813 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:49,813 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:23:49,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:49,847 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:49,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:49,849 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:49,855 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:49,855 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:49,856 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:49,856 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:23:49,873 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:49,874 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661639525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:49,874 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:49,874 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:49,874 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303723839] [2021-05-22 02:23:49,874 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:49,874 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:49,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:49,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:49,874 INFO L87 Difference]: Start difference. First operand 407 states and 1256 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:50,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:50,024 INFO L93 Difference]: Finished difference Result 518 states and 1576 transitions. [2021-05-22 02:23:50,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:50,024 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:50,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:50,025 INFO L225 Difference]: With dead ends: 518 [2021-05-22 02:23:50,025 INFO L226 Difference]: Without dead ends: 491 [2021-05-22 02:23:50,025 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 115.7ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:23:50,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2021-05-22 02:23:50,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 405. [2021-05-22 02:23:50,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 3.0965346534653464) internal successors, (1251), 404 states have internal predecessors, (1251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:50,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 1251 transitions. [2021-05-22 02:23:50,029 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 1251 transitions. Word has length 21 [2021-05-22 02:23:50,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:50,029 INFO L482 AbstractCegarLoop]: Abstraction has 405 states and 1251 transitions. [2021-05-22 02:23:50,029 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:50,030 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 1251 transitions. [2021-05-22 02:23:50,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:50,030 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:50,030 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:50,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable719,225 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:50,233 INFO L430 AbstractCegarLoop]: === Iteration 237 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:50,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:50,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1708420467, now seen corresponding path program 225 times [2021-05-22 02:23:50,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:50,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [352708064] [2021-05-22 02:23:50,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:50,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:50,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:50,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:50,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [352708064] [2021-05-22 02:23:50,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [352708064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:50,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841158857] [2021-05-22 02:23:50,349 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 226 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 226 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:50,375 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:23:50,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:50,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:50,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:50,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:50,450 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:50,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:50,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:50,453 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:50,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:50,484 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:50,484 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:23:50,568 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:50,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:50,569 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:50,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:50,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:50,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:50,579 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:50,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:50,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:50,588 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:13 [2021-05-22 02:23:50,629 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:50,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841158857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:50,629 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:50,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:50,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992513809] [2021-05-22 02:23:50,630 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:50,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:50,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:50,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:50,630 INFO L87 Difference]: Start difference. First operand 405 states and 1251 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:51,242 INFO L93 Difference]: Finished difference Result 664 states and 2001 transitions. [2021-05-22 02:23:51,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:23:51,243 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:51,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:51,244 INFO L225 Difference]: With dead ends: 664 [2021-05-22 02:23:51,244 INFO L226 Difference]: Without dead ends: 645 [2021-05-22 02:23:51,244 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 449.1ms TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:23:51,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 645 states. [2021-05-22 02:23:51,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 645 to 401. [2021-05-22 02:23:51,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 3.0875) internal successors, (1235), 400 states have internal predecessors, (1235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 1235 transitions. [2021-05-22 02:23:51,249 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 1235 transitions. Word has length 21 [2021-05-22 02:23:51,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:51,249 INFO L482 AbstractCegarLoop]: Abstraction has 401 states and 1235 transitions. [2021-05-22 02:23:51,249 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,249 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 1235 transitions. [2021-05-22 02:23:51,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:51,249 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:51,249 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:51,450 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 226 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable723 [2021-05-22 02:23:51,450 INFO L430 AbstractCegarLoop]: === Iteration 238 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:51,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:51,450 INFO L82 PathProgramCache]: Analyzing trace with hash -20541421, now seen corresponding path program 226 times [2021-05-22 02:23:51,450 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:51,450 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120363234] [2021-05-22 02:23:51,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:51,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:51,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:51,533 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:51,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120363234] [2021-05-22 02:23:51,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120363234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:51,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1775529331] [2021-05-22 02:23:51,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 227 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 227 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:51,559 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:51,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:51,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:51,559 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:51,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:51,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:51,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:51,604 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:51,612 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:51,612 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:51,613 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:51,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:51,659 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:51,667 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:51,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:51,668 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:51,674 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:51,674 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:51,674 INFO L518 ElimStorePlain]: Eliminatee v_prenex_20 vanished before elimination [2021-05-22 02:23:51,675 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:51,675 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:23:51,691 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:51,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1775529331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:51,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:51,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:51,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555326157] [2021-05-22 02:23:51,691 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:51,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:51,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:51,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:51,692 INFO L87 Difference]: Start difference. First operand 401 states and 1235 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:51,829 INFO L93 Difference]: Finished difference Result 553 states and 1683 transitions. [2021-05-22 02:23:51,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:51,829 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:51,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:51,830 INFO L225 Difference]: With dead ends: 553 [2021-05-22 02:23:51,830 INFO L226 Difference]: Without dead ends: 524 [2021-05-22 02:23:51,830 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 124.7ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:51,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2021-05-22 02:23:51,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 401. [2021-05-22 02:23:51,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 3.0875) internal successors, (1235), 400 states have internal predecessors, (1235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 1235 transitions. [2021-05-22 02:23:51,835 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 1235 transitions. Word has length 21 [2021-05-22 02:23:51,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:51,835 INFO L482 AbstractCegarLoop]: Abstraction has 401 states and 1235 transitions. [2021-05-22 02:23:51,835 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:51,835 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 1235 transitions. [2021-05-22 02:23:51,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:51,835 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:51,835 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:52,035 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable729,227 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:52,036 INFO L430 AbstractCegarLoop]: === Iteration 239 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:52,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:52,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1115240339, now seen corresponding path program 227 times [2021-05-22 02:23:52,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:52,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753160956] [2021-05-22 02:23:52,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:52,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:52,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:52,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:52,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753160956] [2021-05-22 02:23:52,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753160956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:52,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1406204775] [2021-05-22 02:23:52,135 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 228 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 228 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:52,161 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:23:52,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:52,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:52,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:52,213 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:52,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:52,214 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:52,224 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:52,227 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:52,227 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:23:52,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:52,327 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:52,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:52,328 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:52,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:52,331 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:52,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:52,351 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:52,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:52,352 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:52,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:52,370 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:52,371 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:13 [2021-05-22 02:23:52,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:52,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1406204775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:52,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:52,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:52,442 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [370026969] [2021-05-22 02:23:52,442 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:52,442 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:52,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:52,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:52,442 INFO L87 Difference]: Start difference. First operand 401 states and 1235 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:52,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:52,994 INFO L93 Difference]: Finished difference Result 756 states and 2254 transitions. [2021-05-22 02:23:52,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:23:52,995 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:52,995 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:52,996 INFO L225 Difference]: With dead ends: 756 [2021-05-22 02:23:52,996 INFO L226 Difference]: Without dead ends: 702 [2021-05-22 02:23:52,996 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 416.7ms TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:23:52,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-05-22 02:23:53,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 402. [2021-05-22 02:23:53,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 401 states have (on average 3.112219451371571) internal successors, (1248), 401 states have internal predecessors, (1248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:53,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 1248 transitions. [2021-05-22 02:23:53,001 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 1248 transitions. Word has length 21 [2021-05-22 02:23:53,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:53,001 INFO L482 AbstractCegarLoop]: Abstraction has 402 states and 1248 transitions. [2021-05-22 02:23:53,001 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:53,001 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 1248 transitions. [2021-05-22 02:23:53,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:53,002 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:53,002 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:53,202 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable738,228 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:53,202 INFO L430 AbstractCegarLoop]: === Iteration 240 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:53,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:53,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1739526103, now seen corresponding path program 228 times [2021-05-22 02:23:53,202 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:53,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18754426] [2021-05-22 02:23:53,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:53,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:53,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:53,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:53,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18754426] [2021-05-22 02:23:53,289 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18754426] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:53,289 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478745604] [2021-05-22 02:23:53,289 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 229 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 229 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:53,315 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:53,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:53,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:53,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:53,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:53,379 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:53,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:53,382 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:53,392 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:53,393 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:53,393 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:53,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:53,427 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:53,439 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:53,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:53,443 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:53,453 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:53,453 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:53,453 INFO L518 ElimStorePlain]: Eliminatee v_prenex_22 vanished before elimination [2021-05-22 02:23:53,454 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:53,454 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:23:53,481 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:53,481 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478745604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:53,481 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:53,481 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:23:53,482 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127839839] [2021-05-22 02:23:53,482 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:23:53,482 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:53,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:23:53,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:53,482 INFO L87 Difference]: Start difference. First operand 402 states and 1248 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:53,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:53,662 INFO L93 Difference]: Finished difference Result 561 states and 1713 transitions. [2021-05-22 02:23:53,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:53,662 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:53,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:53,663 INFO L225 Difference]: With dead ends: 561 [2021-05-22 02:23:53,663 INFO L226 Difference]: Without dead ends: 532 [2021-05-22 02:23:53,663 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 125.4ms TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:53,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-22 02:23:53,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 402. [2021-05-22 02:23:53,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 401 states have (on average 3.112219451371571) internal successors, (1248), 401 states have internal predecessors, (1248), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:53,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 1248 transitions. [2021-05-22 02:23:53,668 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 1248 transitions. Word has length 21 [2021-05-22 02:23:53,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:53,668 INFO L482 AbstractCegarLoop]: Abstraction has 402 states and 1248 transitions. [2021-05-22 02:23:53,668 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:53,668 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 1248 transitions. [2021-05-22 02:23:53,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:53,668 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:53,668 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:53,869 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 229 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable751 [2021-05-22 02:23:53,869 INFO L430 AbstractCegarLoop]: === Iteration 241 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:53,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:53,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1442259693, now seen corresponding path program 229 times [2021-05-22 02:23:53,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:53,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991993506] [2021-05-22 02:23:53,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:53,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:53,987 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:53,987 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:53,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991993506] [2021-05-22 02:23:53,987 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1991993506] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:53,987 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560232780] [2021-05-22 02:23:53,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 230 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 230 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:54,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:54,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:54,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:54,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:54,090 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:54,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:54,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:54,093 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:54,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:54,112 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:54,112 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:23:54,157 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_24, v_prenex_23]} [2021-05-22 02:23:54,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:54,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:54,176 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:54,176 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:23:54,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:54,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:54,179 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:54,191 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:54,193 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:54,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:54,194 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:54,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:54,207 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:54,207 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:59, output treesize:22 [2021-05-22 02:23:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:54,276 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560232780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:54,276 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:54,276 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:54,276 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884297856] [2021-05-22 02:23:54,276 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:54,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:54,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:54,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:54,276 INFO L87 Difference]: Start difference. First operand 402 states and 1248 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:54,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:54,763 INFO L93 Difference]: Finished difference Result 714 states and 2161 transitions. [2021-05-22 02:23:54,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:23:54,763 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:54,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:54,764 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:23:54,764 INFO L226 Difference]: Without dead ends: 691 [2021-05-22 02:23:54,765 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 132 ImplicationChecksByTransitivity, 356.7ms TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:23:54,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-22 02:23:54,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 405. [2021-05-22 02:23:54,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 3.126237623762376) internal successors, (1263), 404 states have internal predecessors, (1263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:54,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 1263 transitions. [2021-05-22 02:23:54,770 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 1263 transitions. Word has length 21 [2021-05-22 02:23:54,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:54,770 INFO L482 AbstractCegarLoop]: Abstraction has 405 states and 1263 transitions. [2021-05-22 02:23:54,770 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:54,770 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 1263 transitions. [2021-05-22 02:23:54,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:54,770 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:54,770 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:54,970 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable757,230 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:54,971 INFO L430 AbstractCegarLoop]: === Iteration 242 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:54,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:54,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1564112981, now seen corresponding path program 230 times [2021-05-22 02:23:54,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:54,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159245250] [2021-05-22 02:23:54,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:54,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:55,075 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:55,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159245250] [2021-05-22 02:23:55,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159245250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:55,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635618147] [2021-05-22 02:23:55,075 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 231 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 231 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:55,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:55,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:55,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:55,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:55,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:55,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:55,155 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:55,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:55,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:55,167 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:23:55,212 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:55,212 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:55,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:55,213 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:55,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:55,217 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:55,239 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:55,241 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:55,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:55,242 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:55,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:55,264 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:55,264 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:81, output treesize:25 [2021-05-22 02:23:55,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:55,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635618147] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:55,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:55,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:55,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073512450] [2021-05-22 02:23:55,341 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:55,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:55,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:55,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:55,341 INFO L87 Difference]: Start difference. First operand 405 states and 1263 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:55,819 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:55,820 INFO L93 Difference]: Finished difference Result 681 states and 2047 transitions. [2021-05-22 02:23:55,820 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:23:55,820 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:55,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:55,821 INFO L225 Difference]: With dead ends: 681 [2021-05-22 02:23:55,821 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:23:55,821 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 374.2ms TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:23:55,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:23:55,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 400. [2021-05-22 02:23:55,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 399 states have (on average 3.100250626566416) internal successors, (1237), 399 states have internal predecessors, (1237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:55,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 1237 transitions. [2021-05-22 02:23:55,826 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 1237 transitions. Word has length 21 [2021-05-22 02:23:55,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:55,826 INFO L482 AbstractCegarLoop]: Abstraction has 400 states and 1237 transitions. [2021-05-22 02:23:55,826 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:55,826 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 1237 transitions. [2021-05-22 02:23:55,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:55,827 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:55,827 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:56,027 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 231 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable768 [2021-05-22 02:23:56,027 INFO L430 AbstractCegarLoop]: === Iteration 243 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:56,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:56,027 INFO L82 PathProgramCache]: Analyzing trace with hash -343138925, now seen corresponding path program 231 times [2021-05-22 02:23:56,027 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:56,027 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926124220] [2021-05-22 02:23:56,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:56,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:56,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:56,110 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:56,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [926124220] [2021-05-22 02:23:56,110 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [926124220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:56,110 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718251099] [2021-05-22 02:23:56,111 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 232 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 232 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:56,136 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:23:56,136 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:56,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:56,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:56,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:56,187 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:56,189 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,197 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:56,197 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:56,197 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:56,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:56,234 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,237 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:56,238 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:56,238 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,238 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:23:56,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:56,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718251099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:56,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:56,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:23:56,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317245182] [2021-05-22 02:23:56,251 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:23:56,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:56,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:23:56,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:56,251 INFO L87 Difference]: Start difference. First operand 400 states and 1237 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:56,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:56,395 INFO L93 Difference]: Finished difference Result 534 states and 1625 transitions. [2021-05-22 02:23:56,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:56,395 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:56,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:56,396 INFO L225 Difference]: With dead ends: 534 [2021-05-22 02:23:56,396 INFO L226 Difference]: Without dead ends: 512 [2021-05-22 02:23:56,396 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 157.7ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:23:56,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-05-22 02:23:56,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 403. [2021-05-22 02:23:56,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 3.101990049751244) internal successors, (1247), 402 states have internal predecessors, (1247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:56,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 1247 transitions. [2021-05-22 02:23:56,402 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 1247 transitions. Word has length 21 [2021-05-22 02:23:56,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:56,402 INFO L482 AbstractCegarLoop]: Abstraction has 403 states and 1247 transitions. [2021-05-22 02:23:56,402 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:56,402 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 1247 transitions. [2021-05-22 02:23:56,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:56,403 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:56,403 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:56,625 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 232 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable778 [2021-05-22 02:23:56,625 INFO L430 AbstractCegarLoop]: === Iteration 244 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:56,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:56,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1706818721, now seen corresponding path program 232 times [2021-05-22 02:23:56,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:56,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1263794943] [2021-05-22 02:23:56,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:56,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:56,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:56,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:56,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1263794943] [2021-05-22 02:23:56,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1263794943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:56,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962940581] [2021-05-22 02:23:56,709 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 233 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 233 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:56,735 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:23:56,735 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:56,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:56,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:56,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:56,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:56,783 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:56,792 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:56,792 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:23:56,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:56,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:56,829 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:23:56,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:56,831 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:56,839 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:56,839 INFO L518 ElimStorePlain]: Eliminatee v_prenex_26 vanished before elimination [2021-05-22 02:23:56,840 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:56,840 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:23:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:56,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962940581] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:56,862 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:56,862 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:23:56,862 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032041884] [2021-05-22 02:23:56,863 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:23:56,863 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:56,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:23:56,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:23:56,863 INFO L87 Difference]: Start difference. First operand 403 states and 1247 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:57,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:57,038 INFO L93 Difference]: Finished difference Result 549 states and 1674 transitions. [2021-05-22 02:23:57,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:23:57,038 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:57,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:57,039 INFO L225 Difference]: With dead ends: 549 [2021-05-22 02:23:57,039 INFO L226 Difference]: Without dead ends: 520 [2021-05-22 02:23:57,039 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 140.8ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:23:57,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-05-22 02:23:57,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 403. [2021-05-22 02:23:57,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 3.101990049751244) internal successors, (1247), 402 states have internal predecessors, (1247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:57,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 1247 transitions. [2021-05-22 02:23:57,044 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 1247 transitions. Word has length 21 [2021-05-22 02:23:57,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:57,044 INFO L482 AbstractCegarLoop]: Abstraction has 403 states and 1247 transitions. [2021-05-22 02:23:57,044 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:57,045 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 1247 transitions. [2021-05-22 02:23:57,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:57,045 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:57,045 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:57,248 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 233 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable782 [2021-05-22 02:23:57,249 INFO L430 AbstractCegarLoop]: === Iteration 245 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:57,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:57,249 INFO L82 PathProgramCache]: Analyzing trace with hash 2004085131, now seen corresponding path program 233 times [2021-05-22 02:23:57,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:57,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [18208390] [2021-05-22 02:23:57,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:57,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:57,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:57,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:57,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [18208390] [2021-05-22 02:23:57,348 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [18208390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:57,348 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1270079676] [2021-05-22 02:23:57,348 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 234 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 234 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:57,374 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:23:57,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:57,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:57,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:57,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:57,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:57,426 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:57,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:57,435 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:23:57,435 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:23:57,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:57,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:57,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:57,483 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:57,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:23:57,486 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:57,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:57,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:57,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:57,506 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:57,522 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:57,523 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:57,524 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:23:57,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:57,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1270079676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:57,601 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:57,601 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:57,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227354930] [2021-05-22 02:23:57,601 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:57,601 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:57,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:57,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:57,602 INFO L87 Difference]: Start difference. First operand 403 states and 1247 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:58,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:58,400 INFO L93 Difference]: Finished difference Result 743 states and 2231 transitions. [2021-05-22 02:23:58,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-22 02:23:58,400 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:58,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:58,401 INFO L225 Difference]: With dead ends: 743 [2021-05-22 02:23:58,401 INFO L226 Difference]: Without dead ends: 720 [2021-05-22 02:23:58,402 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 590.0ms TimeCoverageRelationStatistics Valid=173, Invalid=949, Unknown=0, NotChecked=0, Total=1122 [2021-05-22 02:23:58,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-05-22 02:23:58,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 404. [2021-05-22 02:23:58,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 403 states have (on average 3.109181141439206) internal successors, (1253), 403 states have internal predecessors, (1253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:58,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 1253 transitions. [2021-05-22 02:23:58,407 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 1253 transitions. Word has length 21 [2021-05-22 02:23:58,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:58,407 INFO L482 AbstractCegarLoop]: Abstraction has 404 states and 1253 transitions. [2021-05-22 02:23:58,407 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:58,407 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 1253 transitions. [2021-05-22 02:23:58,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:58,407 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:58,407 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:58,607 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable788,234 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:58,608 INFO L430 AbstractCegarLoop]: === Iteration 246 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:58,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:58,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1719822447, now seen corresponding path program 234 times [2021-05-22 02:23:58,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:58,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555581442] [2021-05-22 02:23:58,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:58,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:58,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:58,708 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:58,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555581442] [2021-05-22 02:23:58,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555581442] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:58,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578066448] [2021-05-22 02:23:58,708 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 235 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 235 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:58,737 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:23:58,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:23:58,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:58,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:58,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:58,799 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:58,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:58,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:58,802 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:58,819 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:58,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:58,821 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:48 [2021-05-22 02:23:58,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:58,872 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:58,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:58,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:23:58,875 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:58,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:58,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:58,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:23:58,893 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:58,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:58,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:23:58,909 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:73, output treesize:19 [2021-05-22 02:23:58,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:58,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578066448] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:58,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:23:58,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:23:58,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122053223] [2021-05-22 02:23:58,990 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:23:58,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:23:58,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:23:58,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:23:58,990 INFO L87 Difference]: Start difference. First operand 404 states and 1253 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:59,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:23:59,565 INFO L93 Difference]: Finished difference Result 678 states and 2040 transitions. [2021-05-22 02:23:59,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:23:59,566 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:23:59,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:23:59,567 INFO L225 Difference]: With dead ends: 678 [2021-05-22 02:23:59,567 INFO L226 Difference]: Without dead ends: 651 [2021-05-22 02:23:59,567 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 487.7ms TimeCoverageRelationStatistics Valid=136, Invalid=514, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:23:59,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-05-22 02:23:59,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 416. [2021-05-22 02:23:59,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 416 states, 415 states have (on average 3.1180722891566264) internal successors, (1294), 415 states have internal predecessors, (1294), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:59,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 416 states to 416 states and 1294 transitions. [2021-05-22 02:23:59,572 INFO L78 Accepts]: Start accepts. Automaton has 416 states and 1294 transitions. Word has length 21 [2021-05-22 02:23:59,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:23:59,572 INFO L482 AbstractCegarLoop]: Abstraction has 416 states and 1294 transitions. [2021-05-22 02:23:59,572 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:23:59,572 INFO L276 IsEmpty]: Start isEmpty. Operand 416 states and 1294 transitions. [2021-05-22 02:23:59,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:23:59,572 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:23:59,572 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:23:59,773 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 235 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable797 [2021-05-22 02:23:59,773 INFO L430 AbstractCegarLoop]: === Iteration 247 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:23:59,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:23:59,773 INFO L82 PathProgramCache]: Analyzing trace with hash -499455059, now seen corresponding path program 235 times [2021-05-22 02:23:59,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:23:59,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [616798351] [2021-05-22 02:23:59,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:23:59,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:59,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:23:59,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:23:59,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [616798351] [2021-05-22 02:23:59,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [616798351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:23:59,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411674704] [2021-05-22 02:23:59,869 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 236 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 236 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:23:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:23:59,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:23:59,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:23:59,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:59,960 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:23:59,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:23:59,961 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:59,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:23:59,964 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:23:59,982 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:23:59,983 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:23:59,983 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:48 [2021-05-22 02:24:00,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:00,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:00,046 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,055 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:00,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:00,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:00,057 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:00,066 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,066 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:13 [2021-05-22 02:24:00,110 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:00,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411674704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:00,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:00,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:00,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380534473] [2021-05-22 02:24:00,111 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:00,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:00,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:00,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:00,111 INFO L87 Difference]: Start difference. First operand 416 states and 1294 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:00,431 INFO L93 Difference]: Finished difference Result 595 states and 1802 transitions. [2021-05-22 02:24:00,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:00,431 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:00,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:00,432 INFO L225 Difference]: With dead ends: 595 [2021-05-22 02:24:00,432 INFO L226 Difference]: Without dead ends: 574 [2021-05-22 02:24:00,432 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 307.5ms TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:00,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-22 02:24:00,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 404. [2021-05-22 02:24:00,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 403 states have (on average 3.106699751861042) internal successors, (1252), 403 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 1252 transitions. [2021-05-22 02:24:00,436 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 1252 transitions. Word has length 21 [2021-05-22 02:24:00,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:00,436 INFO L482 AbstractCegarLoop]: Abstraction has 404 states and 1252 transitions. [2021-05-22 02:24:00,436 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,436 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 1252 transitions. [2021-05-22 02:24:00,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:00,437 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:00,437 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:00,637 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable810,236 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:00,637 INFO L430 AbstractCegarLoop]: === Iteration 248 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:00,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:00,638 INFO L82 PathProgramCache]: Analyzing trace with hash -957233069, now seen corresponding path program 236 times [2021-05-22 02:24:00,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:00,638 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155484307] [2021-05-22 02:24:00,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:00,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:00,693 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:00,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:00,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155484307] [2021-05-22 02:24:00,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155484307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:00,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [997470598] [2021-05-22 02:24:00,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 237 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 237 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:00,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:00,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:00,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:00,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:00,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:00,739 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:00,742 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:00,748 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:00,748 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:00,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:00,770 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,772 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:00,772 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:00,773 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:00,773 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:24:00,780 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:00,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [997470598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:00,781 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:00,781 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:24:00,781 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206802995] [2021-05-22 02:24:00,781 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:24:00,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:00,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:24:00,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:24:00,781 INFO L87 Difference]: Start difference. First operand 404 states and 1252 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:00,914 INFO L93 Difference]: Finished difference Result 666 states and 2008 transitions. [2021-05-22 02:24:00,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:00,915 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:00,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:00,915 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:24:00,915 INFO L226 Difference]: Without dead ends: 644 [2021-05-22 02:24:00,916 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 75.2ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:24:00,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-22 02:24:00,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 412. [2021-05-22 02:24:00,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 411 states have (on average 3.1143552311435525) internal successors, (1280), 411 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 1280 transitions. [2021-05-22 02:24:00,920 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 1280 transitions. Word has length 21 [2021-05-22 02:24:00,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:00,920 INFO L482 AbstractCegarLoop]: Abstraction has 412 states and 1280 transitions. [2021-05-22 02:24:00,920 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:00,920 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 1280 transitions. [2021-05-22 02:24:00,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:00,921 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:00,921 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:01,121 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 237 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable815 [2021-05-22 02:24:01,121 INFO L430 AbstractCegarLoop]: === Iteration 249 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:01,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:01,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1247945405, now seen corresponding path program 237 times [2021-05-22 02:24:01,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:01,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990722153] [2021-05-22 02:24:01,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:01,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:01,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:01,198 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:01,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990722153] [2021-05-22 02:24:01,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990722153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:01,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14087757] [2021-05-22 02:24:01,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 238 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 238 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:01,223 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:01,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:01,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:01,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:01,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:01,243 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:01,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:01,245 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:01,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:01,252 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:01,252 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:01,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:01,308 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:01,311 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:01,311 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:01,311 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:01,311 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:24:01,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:01,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14087757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:01,335 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:01,335 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:01,335 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964941288] [2021-05-22 02:24:01,335 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:01,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:01,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:01,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:01,335 INFO L87 Difference]: Start difference. First operand 412 states and 1280 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:02,016 INFO L93 Difference]: Finished difference Result 958 states and 2871 transitions. [2021-05-22 02:24:02,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-22 02:24:02,017 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:02,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:02,018 INFO L225 Difference]: With dead ends: 958 [2021-05-22 02:24:02,018 INFO L226 Difference]: Without dead ends: 939 [2021-05-22 02:24:02,018 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 533.9ms TimeCoverageRelationStatistics Valid=265, Invalid=1141, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:24:02,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 939 states. [2021-05-22 02:24:02,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 939 to 418. [2021-05-22 02:24:02,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 417 states have (on average 3.1247002398081536) internal successors, (1303), 417 states have internal predecessors, (1303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 1303 transitions. [2021-05-22 02:24:02,024 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 1303 transitions. Word has length 21 [2021-05-22 02:24:02,024 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:02,024 INFO L482 AbstractCegarLoop]: Abstraction has 418 states and 1303 transitions. [2021-05-22 02:24:02,024 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,024 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 1303 transitions. [2021-05-22 02:24:02,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:02,024 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:02,024 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:02,224 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable818,238 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:02,225 INFO L430 AbstractCegarLoop]: === Iteration 250 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:02,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:02,225 INFO L82 PathProgramCache]: Analyzing trace with hash -2090256769, now seen corresponding path program 238 times [2021-05-22 02:24:02,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:02,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245183763] [2021-05-22 02:24:02,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:02,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:02,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:02,303 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:02,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245183763] [2021-05-22 02:24:02,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245183763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:02,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1079886921] [2021-05-22 02:24:02,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 239 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 239 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:02,329 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:02,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:02,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:02,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:02,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:02,345 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:02,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:02,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:02,349 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:24:02,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:02,403 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:02,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:02,405 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:02,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:02,408 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:02,408 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:02,408 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:24:02,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:02,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1079886921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:02,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:02,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:02,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [707240668] [2021-05-22 02:24:02,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:02,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:02,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:02,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:02,433 INFO L87 Difference]: Start difference. First operand 418 states and 1303 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:02,749 INFO L93 Difference]: Finished difference Result 709 states and 2145 transitions. [2021-05-22 02:24:02,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:02,749 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:02,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:02,750 INFO L225 Difference]: With dead ends: 709 [2021-05-22 02:24:02,750 INFO L226 Difference]: Without dead ends: 670 [2021-05-22 02:24:02,750 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 231.8ms TimeCoverageRelationStatistics Valid=125, Invalid=427, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:02,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-22 02:24:02,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 419. [2021-05-22 02:24:02,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 418 states have (on average 3.117224880382775) internal successors, (1303), 418 states have internal predecessors, (1303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 1303 transitions. [2021-05-22 02:24:02,755 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 1303 transitions. Word has length 21 [2021-05-22 02:24:02,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:02,755 INFO L482 AbstractCegarLoop]: Abstraction has 419 states and 1303 transitions. [2021-05-22 02:24:02,755 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:02,755 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 1303 transitions. [2021-05-22 02:24:02,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:02,756 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:02,756 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:02,960 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable824,239 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:02,961 INFO L430 AbstractCegarLoop]: === Iteration 251 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:02,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:02,961 INFO L82 PathProgramCache]: Analyzing trace with hash -694754787, now seen corresponding path program 239 times [2021-05-22 02:24:02,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:02,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1567111091] [2021-05-22 02:24:02,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:02,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:03,039 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:03,039 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:03,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1567111091] [2021-05-22 02:24:03,039 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1567111091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:03,039 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049270024] [2021-05-22 02:24:03,039 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 240 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 240 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:03,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:03,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:03,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:03,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:03,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:03,085 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:03,088 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:03,091 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:03,093 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,113 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:03,114 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:24:03,114 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:89, output treesize:57 [2021-05-22 02:24:03,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:24:03,225 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:03,227 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:03,235 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:03,235 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:03,236 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:03,236 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:24:03,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:03,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049270024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:03,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:03,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:03,278 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215122610] [2021-05-22 02:24:03,278 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:03,278 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:03,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:03,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:03,278 INFO L87 Difference]: Start difference. First operand 419 states and 1303 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:04,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:04,415 INFO L93 Difference]: Finished difference Result 1026 states and 3126 transitions. [2021-05-22 02:24:04,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:24:04,415 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:04,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:04,417 INFO L225 Difference]: With dead ends: 1026 [2021-05-22 02:24:04,417 INFO L226 Difference]: Without dead ends: 988 [2021-05-22 02:24:04,417 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 377 ImplicationChecksByTransitivity, 914.2ms TimeCoverageRelationStatistics Valid=260, Invalid=1300, Unknown=0, NotChecked=0, Total=1560 [2021-05-22 02:24:04,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2021-05-22 02:24:04,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 429. [2021-05-22 02:24:04,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 3.130841121495327) internal successors, (1340), 428 states have internal predecessors, (1340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:04,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 1340 transitions. [2021-05-22 02:24:04,423 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 1340 transitions. Word has length 21 [2021-05-22 02:24:04,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:04,423 INFO L482 AbstractCegarLoop]: Abstraction has 429 states and 1340 transitions. [2021-05-22 02:24:04,423 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:04,423 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 1340 transitions. [2021-05-22 02:24:04,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:04,423 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:04,423 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:04,624 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable827,240 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:04,624 INFO L430 AbstractCegarLoop]: === Iteration 252 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:04,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:04,624 INFO L82 PathProgramCache]: Analyzing trace with hash 991637053, now seen corresponding path program 240 times [2021-05-22 02:24:04,624 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:04,624 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785227855] [2021-05-22 02:24:04,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:04,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:04,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:04,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:04,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785227855] [2021-05-22 02:24:04,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [785227855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:04,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119890658] [2021-05-22 02:24:04,711 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 241 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 241 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:04,737 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:04,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:04,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:04,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:04,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:04,757 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:04,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:04,759 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:04,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:04,766 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:04,766 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:04,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:04,814 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:04,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:04,816 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:04,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:04,822 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:04,822 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:04,822 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:24:04,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:04,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119890658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:04,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:04,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:04,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028448126] [2021-05-22 02:24:04,864 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:04,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:04,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:04,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:04,865 INFO L87 Difference]: Start difference. First operand 429 states and 1340 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:05,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:05,519 INFO L93 Difference]: Finished difference Result 1019 states and 3075 transitions. [2021-05-22 02:24:05,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-22 02:24:05,520 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:05,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:05,521 INFO L225 Difference]: With dead ends: 1019 [2021-05-22 02:24:05,521 INFO L226 Difference]: Without dead ends: 996 [2021-05-22 02:24:05,522 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 476.9ms TimeCoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2021-05-22 02:24:05,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 996 states. [2021-05-22 02:24:05,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 996 to 423. [2021-05-22 02:24:05,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 3.137440758293839) internal successors, (1324), 422 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:05,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 1324 transitions. [2021-05-22 02:24:05,529 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 1324 transitions. Word has length 21 [2021-05-22 02:24:05,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:05,529 INFO L482 AbstractCegarLoop]: Abstraction has 423 states and 1324 transitions. [2021-05-22 02:24:05,529 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:05,529 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 1324 transitions. [2021-05-22 02:24:05,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:05,529 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:05,529 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:05,730 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable835,241 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:05,730 INFO L430 AbstractCegarLoop]: === Iteration 253 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:05,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:05,730 INFO L82 PathProgramCache]: Analyzing trace with hash 1655597913, now seen corresponding path program 241 times [2021-05-22 02:24:05,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:05,730 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478891353] [2021-05-22 02:24:05,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:05,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:05,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:05,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:05,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478891353] [2021-05-22 02:24:05,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478891353] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:05,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828040016] [2021-05-22 02:24:05,828 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 242 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 242 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:05,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:05,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:05,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:05,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:05,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:05,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:05,885 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:05,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:05,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:05,892 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:05,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:05,919 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:05,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:05,922 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:05,922 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:05,922 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:24:05,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:05,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828040016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:05,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:05,932 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:24:05,932 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016351192] [2021-05-22 02:24:05,932 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:24:05,932 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:05,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:24:05,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:24:05,932 INFO L87 Difference]: Start difference. First operand 423 states and 1324 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:06,108 INFO L93 Difference]: Finished difference Result 687 states and 2113 transitions. [2021-05-22 02:24:06,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:06,109 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:06,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:06,110 INFO L225 Difference]: With dead ends: 687 [2021-05-22 02:24:06,110 INFO L226 Difference]: Without dead ends: 665 [2021-05-22 02:24:06,110 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 129.8ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:06,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-05-22 02:24:06,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 426. [2021-05-22 02:24:06,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 3.1341176470588237) internal successors, (1332), 425 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 1332 transitions. [2021-05-22 02:24:06,117 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 1332 transitions. Word has length 21 [2021-05-22 02:24:06,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:06,117 INFO L482 AbstractCegarLoop]: Abstraction has 426 states and 1332 transitions. [2021-05-22 02:24:06,117 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,117 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 1332 transitions. [2021-05-22 02:24:06,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:06,117 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:06,117 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:06,318 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable842,242 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:06,318 INFO L430 AbstractCegarLoop]: === Iteration 254 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:06,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:06,318 INFO L82 PathProgramCache]: Analyzing trace with hash -758616445, now seen corresponding path program 242 times [2021-05-22 02:24:06,318 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:06,318 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1465175630] [2021-05-22 02:24:06,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:06,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:06,389 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:06,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:06,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1465175630] [2021-05-22 02:24:06,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1465175630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:06,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262710760] [2021-05-22 02:24:06,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 243 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 243 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:06,415 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:06,415 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:06,415 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:06,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:06,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:06,435 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:06,437 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,443 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:06,443 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:06,444 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:06,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:06,479 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:06,481 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,488 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:06,488 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:06,489 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:06,489 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:24:06,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:06,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262710760] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:06,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:06,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:24:06,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [299863310] [2021-05-22 02:24:06,506 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:24:06,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:06,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:24:06,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:24:06,506 INFO L87 Difference]: Start difference. First operand 426 states and 1332 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:06,660 INFO L93 Difference]: Finished difference Result 690 states and 2115 transitions. [2021-05-22 02:24:06,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:06,660 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:06,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:06,661 INFO L225 Difference]: With dead ends: 690 [2021-05-22 02:24:06,661 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:24:06,661 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 109.5ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:06,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:24:06,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 417. [2021-05-22 02:24:06,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 3.125) internal successors, (1300), 416 states have internal predecessors, (1300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 1300 transitions. [2021-05-22 02:24:06,666 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 1300 transitions. Word has length 21 [2021-05-22 02:24:06,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:06,666 INFO L482 AbstractCegarLoop]: Abstraction has 417 states and 1300 transitions. [2021-05-22 02:24:06,666 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:06,667 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 1300 transitions. [2021-05-22 02:24:06,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:06,667 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:06,667 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:06,867 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 243 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable846 [2021-05-22 02:24:06,868 INFO L430 AbstractCegarLoop]: === Iteration 255 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:06,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:06,868 INFO L82 PathProgramCache]: Analyzing trace with hash -132745653, now seen corresponding path program 243 times [2021-05-22 02:24:06,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:06,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135485965] [2021-05-22 02:24:06,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:06,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:06,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:06,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:06,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135485965] [2021-05-22 02:24:06,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [135485965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:06,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [723564580] [2021-05-22 02:24:06,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 244 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 244 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:06,964 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:06,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:06,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:06,965 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:06,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:06,995 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,997 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:06,998 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:06,998 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:24:07,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:07,035 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:07,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:07,037 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:07,037 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:07,037 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:24:07,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:07,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [723564580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:07,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:07,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:07,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423775985] [2021-05-22 02:24:07,061 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:07,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:07,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:07,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:07,061 INFO L87 Difference]: Start difference. First operand 417 states and 1300 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:07,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:07,697 INFO L93 Difference]: Finished difference Result 818 states and 2455 transitions. [2021-05-22 02:24:07,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:24:07,698 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:07,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:07,699 INFO L225 Difference]: With dead ends: 818 [2021-05-22 02:24:07,699 INFO L226 Difference]: Without dead ends: 799 [2021-05-22 02:24:07,699 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 341 ImplicationChecksByTransitivity, 488.8ms TimeCoverageRelationStatistics Valid=247, Invalid=1159, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:24:07,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-05-22 02:24:07,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 417. [2021-05-22 02:24:07,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 3.105769230769231) internal successors, (1292), 416 states have internal predecessors, (1292), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:07,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 1292 transitions. [2021-05-22 02:24:07,704 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 1292 transitions. Word has length 21 [2021-05-22 02:24:07,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:07,704 INFO L482 AbstractCegarLoop]: Abstraction has 417 states and 1292 transitions. [2021-05-22 02:24:07,704 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:07,704 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 1292 transitions. [2021-05-22 02:24:07,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:07,705 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:07,705 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:07,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 244 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable851 [2021-05-22 02:24:07,909 INFO L430 AbstractCegarLoop]: === Iteration 256 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:07,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:07,910 INFO L82 PathProgramCache]: Analyzing trace with hash 65870971, now seen corresponding path program 244 times [2021-05-22 02:24:07,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:07,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719620265] [2021-05-22 02:24:07,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:07,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:07,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:07,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:07,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719620265] [2021-05-22 02:24:07,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719620265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:07,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492346964] [2021-05-22 02:24:07,991 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 245 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 245 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:08,019 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:08,019 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:08,020 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:08,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:08,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:08,046 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:08,050 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,050 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:24:08,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:08,064 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,068 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:08,068 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:08,068 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,068 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:24:08,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:08,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492346964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:08,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:08,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:24:08,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389288630] [2021-05-22 02:24:08,080 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:24:08,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:08,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:24:08,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:24:08,080 INFO L87 Difference]: Start difference. First operand 417 states and 1292 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:08,191 INFO L93 Difference]: Finished difference Result 540 states and 1648 transitions. [2021-05-22 02:24:08,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:08,192 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:08,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:08,193 INFO L225 Difference]: With dead ends: 540 [2021-05-22 02:24:08,193 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:24:08,193 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 89.7ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:24:08,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:24:08,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 418. [2021-05-22 02:24:08,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 417 states have (on average 3.117505995203837) internal successors, (1300), 417 states have internal predecessors, (1300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 1300 transitions. [2021-05-22 02:24:08,199 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 1300 transitions. Word has length 21 [2021-05-22 02:24:08,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:08,199 INFO L482 AbstractCegarLoop]: Abstraction has 418 states and 1300 transitions. [2021-05-22 02:24:08,199 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,200 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 1300 transitions. [2021-05-22 02:24:08,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:08,200 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:08,200 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:08,401 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 245 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable853 [2021-05-22 02:24:08,401 INFO L430 AbstractCegarLoop]: === Iteration 257 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:08,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:08,401 INFO L82 PathProgramCache]: Analyzing trace with hash 1174020435, now seen corresponding path program 245 times [2021-05-22 02:24:08,401 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:08,401 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1282103888] [2021-05-22 02:24:08,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:08,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:08,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:08,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1282103888] [2021-05-22 02:24:08,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1282103888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:08,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376692279] [2021-05-22 02:24:08,480 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 246 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 246 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:08,520 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:08,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:08,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:08,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:08,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:08,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:08,556 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:08,562 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:08,562 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:08,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:08,575 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:08,577 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:08,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:08,577 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:24:08,585 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:08,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376692279] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:08,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:08,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:24:08,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518839160] [2021-05-22 02:24:08,586 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:24:08,586 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:08,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:24:08,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:24:08,586 INFO L87 Difference]: Start difference. First operand 418 states and 1300 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:08,711 INFO L93 Difference]: Finished difference Result 535 states and 1640 transitions. [2021-05-22 02:24:08,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:08,711 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:08,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:08,712 INFO L225 Difference]: With dead ends: 535 [2021-05-22 02:24:08,712 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:24:08,712 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 91.1ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:24:08,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:24:08,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 425. [2021-05-22 02:24:08,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1202830188679247) internal successors, (1323), 424 states have internal predecessors, (1323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1323 transitions. [2021-05-22 02:24:08,717 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1323 transitions. Word has length 21 [2021-05-22 02:24:08,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:08,717 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1323 transitions. [2021-05-22 02:24:08,717 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:08,717 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1323 transitions. [2021-05-22 02:24:08,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:08,717 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:08,717 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:08,918 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable855,246 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:08,918 INFO L430 AbstractCegarLoop]: === Iteration 258 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:08,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:08,918 INFO L82 PathProgramCache]: Analyzing trace with hash 1598092345, now seen corresponding path program 246 times [2021-05-22 02:24:08,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:08,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098667460] [2021-05-22 02:24:08,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:08,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:08,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:08,997 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:08,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098667460] [2021-05-22 02:24:08,997 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2098667460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:08,997 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2138147024] [2021-05-22 02:24:08,997 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 247 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 247 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:09,025 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:24:09,026 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:09,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:09,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:09,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:09,058 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:09,062 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,062 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:24:09,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:09,095 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:09,097 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,100 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:09,100 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:09,100 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:09,100 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:24:09,107 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:09,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2138147024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:09,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:09,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:09,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766903858] [2021-05-22 02:24:09,108 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:09,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:09,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:09,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:09,108 INFO L87 Difference]: Start difference. First operand 425 states and 1323 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:09,236 INFO L93 Difference]: Finished difference Result 544 states and 1666 transitions. [2021-05-22 02:24:09,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:09,236 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:09,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:09,237 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:24:09,237 INFO L226 Difference]: Without dead ends: 511 [2021-05-22 02:24:09,237 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 104.5ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:09,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-05-22 02:24:09,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 425. [2021-05-22 02:24:09,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1132075471698113) internal successors, (1320), 424 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1320 transitions. [2021-05-22 02:24:09,241 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1320 transitions. Word has length 21 [2021-05-22 02:24:09,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:09,241 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1320 transitions. [2021-05-22 02:24:09,241 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,241 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1320 transitions. [2021-05-22 02:24:09,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:09,242 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:09,242 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:09,442 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable858,247 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:09,442 INFO L430 AbstractCegarLoop]: === Iteration 259 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:09,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:09,443 INFO L82 PathProgramCache]: Analyzing trace with hash -1240193923, now seen corresponding path program 247 times [2021-05-22 02:24:09,443 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:09,443 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885555250] [2021-05-22 02:24:09,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:09,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:09,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:09,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:09,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885555250] [2021-05-22 02:24:09,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885555250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:09,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1456232690] [2021-05-22 02:24:09,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 248 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 248 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:09,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:09,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:09,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:09,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:09,567 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:09,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:09,575 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:09,575 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:09,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:09,586 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:09,588 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:09,594 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:09,594 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:09,594 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:09,595 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:24:09,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:09,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1456232690] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:09,611 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:09,611 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:24:09,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111306730] [2021-05-22 02:24:09,611 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:24:09,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:09,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:24:09,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:24:09,611 INFO L87 Difference]: Start difference. First operand 425 states and 1320 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:09,744 INFO L93 Difference]: Finished difference Result 571 states and 1757 transitions. [2021-05-22 02:24:09,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:09,744 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:09,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:09,745 INFO L225 Difference]: With dead ends: 571 [2021-05-22 02:24:09,745 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:24:09,745 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 88.4ms TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:24:09,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:24:09,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 425. [2021-05-22 02:24:09,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1132075471698113) internal successors, (1320), 424 states have internal predecessors, (1320), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1320 transitions. [2021-05-22 02:24:09,750 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1320 transitions. Word has length 21 [2021-05-22 02:24:09,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:09,750 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1320 transitions. [2021-05-22 02:24:09,750 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:09,750 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1320 transitions. [2021-05-22 02:24:09,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:09,750 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:09,750 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:09,950 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 248 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable861 [2021-05-22 02:24:09,951 INFO L430 AbstractCegarLoop]: === Iteration 260 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:09,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:09,951 INFO L82 PathProgramCache]: Analyzing trace with hash 1960074455, now seen corresponding path program 248 times [2021-05-22 02:24:09,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:09,951 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1434877229] [2021-05-22 02:24:09,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:09,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:10,020 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:10,021 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:10,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1434877229] [2021-05-22 02:24:10,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1434877229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:10,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [655881704] [2021-05-22 02:24:10,021 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 249 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 249 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:10,047 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:10,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:10,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:10,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:10,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:10,078 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,082 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:10,082 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,082 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:24:10,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:10,102 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:10,104 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:10,110 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:10,110 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:10,111 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:24:10,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:10,153 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [655881704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:10,153 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:10,153 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:10,153 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867700769] [2021-05-22 02:24:10,153 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:10,153 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:10,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:10,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:10,153 INFO L87 Difference]: Start difference. First operand 425 states and 1320 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:10,330 INFO L93 Difference]: Finished difference Result 531 states and 1632 transitions. [2021-05-22 02:24:10,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:10,331 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:10,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:10,331 INFO L225 Difference]: With dead ends: 531 [2021-05-22 02:24:10,331 INFO L226 Difference]: Without dead ends: 504 [2021-05-22 02:24:10,332 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 114.4ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:10,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-05-22 02:24:10,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 422. [2021-05-22 02:24:10,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 421 states have (on average 3.116389548693587) internal successors, (1312), 421 states have internal predecessors, (1312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 1312 transitions. [2021-05-22 02:24:10,336 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 1312 transitions. Word has length 21 [2021-05-22 02:24:10,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:10,336 INFO L482 AbstractCegarLoop]: Abstraction has 422 states and 1312 transitions. [2021-05-22 02:24:10,336 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,336 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 1312 transitions. [2021-05-22 02:24:10,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:10,337 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:10,337 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:10,545 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 249 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable865 [2021-05-22 02:24:10,545 INFO L430 AbstractCegarLoop]: === Iteration 261 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:10,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:10,545 INFO L82 PathProgramCache]: Analyzing trace with hash 866590197, now seen corresponding path program 249 times [2021-05-22 02:24:10,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:10,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875718915] [2021-05-22 02:24:10,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:10,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:10,613 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:10,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:10,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875718915] [2021-05-22 02:24:10,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875718915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:10,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916406040] [2021-05-22 02:24:10,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 250 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 250 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:10,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:10,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:10,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:10,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:10,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:10,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:10,673 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,673 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:19 [2021-05-22 02:24:10,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:24:10,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:24:10,694 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:10,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:10,700 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:10,700 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:10,700 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:24:10,717 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:10,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [916406040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:10,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:10,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:24:10,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593764097] [2021-05-22 02:24:10,717 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:24:10,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:10,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:24:10,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:24:10,717 INFO L87 Difference]: Start difference. First operand 422 states and 1312 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:10,851 INFO L93 Difference]: Finished difference Result 549 states and 1680 transitions. [2021-05-22 02:24:10,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:10,852 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:10,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:10,852 INFO L225 Difference]: With dead ends: 549 [2021-05-22 02:24:10,852 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:24:10,853 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 100.7ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:10,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:24:10,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 425. [2021-05-22 02:24:10,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1179245283018866) internal successors, (1322), 424 states have internal predecessors, (1322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1322 transitions. [2021-05-22 02:24:10,857 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1322 transitions. Word has length 21 [2021-05-22 02:24:10,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:10,857 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1322 transitions. [2021-05-22 02:24:10,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:10,857 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1322 transitions. [2021-05-22 02:24:10,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:10,858 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:10,858 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:11,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 250 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable871 [2021-05-22 02:24:11,058 INFO L430 AbstractCegarLoop]: === Iteration 262 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:11,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:11,058 INFO L82 PathProgramCache]: Analyzing trace with hash -228108721, now seen corresponding path program 250 times [2021-05-22 02:24:11,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:11,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053032725] [2021-05-22 02:24:11,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:11,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:11,140 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:11,140 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:11,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053032725] [2021-05-22 02:24:11,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053032725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:11,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1755820576] [2021-05-22 02:24:11,140 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 251 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 251 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:11,165 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:11,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:11,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:11,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:11,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:11,201 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:11,204 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:11,210 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:11,210 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:11,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:11,232 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,239 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:11,239 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:11,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:11,241 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:11,247 INFO L518 ElimStorePlain]: Eliminatee v_prenex_27 vanished before elimination [2021-05-22 02:24:11,248 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:11,248 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:24:11,275 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:11,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1755820576] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:11,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:11,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:11,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028613504] [2021-05-22 02:24:11,275 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:11,276 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:11,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:11,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:11,276 INFO L87 Difference]: Start difference. First operand 425 states and 1322 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:11,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:11,485 INFO L93 Difference]: Finished difference Result 590 states and 1797 transitions. [2021-05-22 02:24:11,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:11,485 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:11,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:11,486 INFO L225 Difference]: With dead ends: 590 [2021-05-22 02:24:11,486 INFO L226 Difference]: Without dead ends: 563 [2021-05-22 02:24:11,486 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 160.7ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:11,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-05-22 02:24:11,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 441. [2021-05-22 02:24:11,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 3.1204545454545456) internal successors, (1373), 440 states have internal predecessors, (1373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:11,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 1373 transitions. [2021-05-22 02:24:11,491 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 1373 transitions. Word has length 21 [2021-05-22 02:24:11,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:11,491 INFO L482 AbstractCegarLoop]: Abstraction has 441 states and 1373 transitions. [2021-05-22 02:24:11,491 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:11,491 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 1373 transitions. [2021-05-22 02:24:11,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:11,491 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:11,492 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:11,692 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable874,251 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:11,692 INFO L430 AbstractCegarLoop]: === Iteration 263 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:11,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:11,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1652644217, now seen corresponding path program 251 times [2021-05-22 02:24:11,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:11,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7308303] [2021-05-22 02:24:11,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:11,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:11,761 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:11,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:11,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7308303] [2021-05-22 02:24:11,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7308303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:11,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [811730504] [2021-05-22 02:24:11,762 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 252 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 252 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:11,789 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:11,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:11,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:11,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:11,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:11,836 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,837 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:11,838 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:11,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:11,845 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:24:11,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:11,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:11,878 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:11,889 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:11,889 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:11,889 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:11,889 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:25 [2021-05-22 02:24:11,935 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:11,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [811730504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:11,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:11,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:11,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910235175] [2021-05-22 02:24:11,936 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:11,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:11,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:11,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:11,936 INFO L87 Difference]: Start difference. First operand 441 states and 1373 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:12,193 INFO L93 Difference]: Finished difference Result 540 states and 1644 transitions. [2021-05-22 02:24:12,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:12,193 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:12,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:12,194 INFO L225 Difference]: With dead ends: 540 [2021-05-22 02:24:12,194 INFO L226 Difference]: Without dead ends: 519 [2021-05-22 02:24:12,194 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 196.7ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:12,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-05-22 02:24:12,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 434. [2021-05-22 02:24:12,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 433 states have (on average 3.1247113163972284) internal successors, (1353), 433 states have internal predecessors, (1353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 1353 transitions. [2021-05-22 02:24:12,199 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 1353 transitions. Word has length 21 [2021-05-22 02:24:12,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:12,199 INFO L482 AbstractCegarLoop]: Abstraction has 434 states and 1353 transitions. [2021-05-22 02:24:12,199 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,199 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 1353 transitions. [2021-05-22 02:24:12,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:12,199 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:12,199 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:12,399 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 252 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable882 [2021-05-22 02:24:12,400 INFO L430 AbstractCegarLoop]: === Iteration 264 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:12,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:12,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1434637307, now seen corresponding path program 252 times [2021-05-22 02:24:12,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:12,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [133875849] [2021-05-22 02:24:12,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:12,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:12,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:12,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:12,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [133875849] [2021-05-22 02:24:12,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [133875849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:12,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [270129921] [2021-05-22 02:24:12,511 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 253 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 253 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:12,537 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:12,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:12,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:12,538 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:12,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:12,575 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:12,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:12,578 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:12,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:12,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:12,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:12,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:12,637 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:12,640 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:12,640 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:12,640 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:12,640 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:24:12,648 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:12,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [270129921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:12,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:12,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:12,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116175706] [2021-05-22 02:24:12,648 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:12,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:12,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:12,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:12,649 INFO L87 Difference]: Start difference. First operand 434 states and 1353 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:12,795 INFO L93 Difference]: Finished difference Result 568 states and 1737 transitions. [2021-05-22 02:24:12,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:12,796 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:12,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:12,796 INFO L225 Difference]: With dead ends: 568 [2021-05-22 02:24:12,796 INFO L226 Difference]: Without dead ends: 546 [2021-05-22 02:24:12,796 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 140.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:12,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-22 02:24:12,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 441. [2021-05-22 02:24:12,800 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 3.1386363636363637) internal successors, (1381), 440 states have internal predecessors, (1381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 1381 transitions. [2021-05-22 02:24:12,801 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 1381 transitions. Word has length 21 [2021-05-22 02:24:12,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:12,801 INFO L482 AbstractCegarLoop]: Abstraction has 441 states and 1381 transitions. [2021-05-22 02:24:12,801 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:12,801 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 1381 transitions. [2021-05-22 02:24:12,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:12,802 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:12,802 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:13,002 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 253 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable887 [2021-05-22 02:24:13,002 INFO L430 AbstractCegarLoop]: === Iteration 265 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:13,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:13,002 INFO L82 PathProgramCache]: Analyzing trace with hash 932845971, now seen corresponding path program 253 times [2021-05-22 02:24:13,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:13,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14733686] [2021-05-22 02:24:13,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:13,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:13,078 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:13,078 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:13,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14733686] [2021-05-22 02:24:13,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14733686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:13,078 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [457686701] [2021-05-22 02:24:13,078 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 254 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 254 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:13,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:13,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:13,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:13,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:13,150 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:13,153 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,161 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:13,162 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:13,162 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:13,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:13,199 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,202 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:13,202 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:13,202 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,202 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:24:13,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:13,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [457686701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:13,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:13,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:13,215 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824974987] [2021-05-22 02:24:13,216 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:13,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:13,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:13,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:13,216 INFO L87 Difference]: Start difference. First operand 441 states and 1381 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:13,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:13,338 INFO L93 Difference]: Finished difference Result 559 states and 1713 transitions. [2021-05-22 02:24:13,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:13,338 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:13,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:13,339 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:24:13,339 INFO L226 Difference]: Without dead ends: 537 [2021-05-22 02:24:13,339 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 113.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:13,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-05-22 02:24:13,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 438. [2021-05-22 02:24:13,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.1327231121281462) internal successors, (1369), 437 states have internal predecessors, (1369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:13,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1369 transitions. [2021-05-22 02:24:13,344 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1369 transitions. Word has length 21 [2021-05-22 02:24:13,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:13,344 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1369 transitions. [2021-05-22 02:24:13,344 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:13,344 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1369 transitions. [2021-05-22 02:24:13,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:13,344 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:13,344 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:13,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable890,254 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:13,545 INFO L430 AbstractCegarLoop]: === Iteration 266 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:13,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:13,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1837752813, now seen corresponding path program 254 times [2021-05-22 02:24:13,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:13,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [273352912] [2021-05-22 02:24:13,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:13,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:13,645 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:13,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:13,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [273352912] [2021-05-22 02:24:13,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [273352912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:13,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890366669] [2021-05-22 02:24:13,645 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 255 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 255 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:13,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:13,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:13,686 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:13,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:13,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:13,725 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:13,731 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,731 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:24:13,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:13,791 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:13,793 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:13,795 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:13,795 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:13,796 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:13,796 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:24:13,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:13,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890366669] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:13,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:13,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:13,824 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224959826] [2021-05-22 02:24:13,824 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:13,824 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:13,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:13,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:13,824 INFO L87 Difference]: Start difference. First operand 438 states and 1369 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:14,115 INFO L93 Difference]: Finished difference Result 714 states and 2149 transitions. [2021-05-22 02:24:14,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:24:14,116 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:14,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:14,117 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:24:14,117 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:24:14,117 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 218.5ms TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:14,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:24:14,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 438. [2021-05-22 02:24:14,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.125858123569794) internal successors, (1366), 437 states have internal predecessors, (1366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1366 transitions. [2021-05-22 02:24:14,122 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1366 transitions. Word has length 21 [2021-05-22 02:24:14,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:14,122 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1366 transitions. [2021-05-22 02:24:14,122 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,122 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1366 transitions. [2021-05-22 02:24:14,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:14,122 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:14,123 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:14,323 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 255 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable893 [2021-05-22 02:24:14,323 INFO L430 AbstractCegarLoop]: === Iteration 267 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:14,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:14,323 INFO L82 PathProgramCache]: Analyzing trace with hash 19262995, now seen corresponding path program 255 times [2021-05-22 02:24:14,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:14,323 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630944568] [2021-05-22 02:24:14,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:14,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:14,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:14,400 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:14,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630944568] [2021-05-22 02:24:14,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630944568] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:14,400 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63857204] [2021-05-22 02:24:14,400 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 256 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 256 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:14,436 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:14,436 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:14,437 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:14,437 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:14,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:14,486 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:14,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:14,488 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:14,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:14,497 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:14,497 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:14,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:14,546 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:14,553 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:14,553 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:14,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:14,555 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:14,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:14,561 INFO L518 ElimStorePlain]: Eliminatee v_prenex_29 vanished before elimination [2021-05-22 02:24:14,561 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:14,561 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:24:14,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:14,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63857204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:14,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:14,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:14,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [172276957] [2021-05-22 02:24:14,587 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:14,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:14,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:14,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:14,587 INFO L87 Difference]: Start difference. First operand 438 states and 1366 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:14,750 INFO L93 Difference]: Finished difference Result 600 states and 1841 transitions. [2021-05-22 02:24:14,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:14,751 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:14,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:14,751 INFO L225 Difference]: With dead ends: 600 [2021-05-22 02:24:14,751 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:24:14,752 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 126.6ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:14,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:24:14,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 438. [2021-05-22 02:24:14,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.125858123569794) internal successors, (1366), 437 states have internal predecessors, (1366), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1366 transitions. [2021-05-22 02:24:14,756 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1366 transitions. Word has length 21 [2021-05-22 02:24:14,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:14,756 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1366 transitions. [2021-05-22 02:24:14,756 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:14,756 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1366 transitions. [2021-05-22 02:24:14,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:14,757 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:14,757 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:14,957 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable896,256 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:14,957 INFO L430 AbstractCegarLoop]: === Iteration 268 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:14,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:14,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1075435923, now seen corresponding path program 256 times [2021-05-22 02:24:14,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:14,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1057595846] [2021-05-22 02:24:14,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:14,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:15,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:15,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:15,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1057595846] [2021-05-22 02:24:15,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1057595846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:15,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581148100] [2021-05-22 02:24:15,037 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 257 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 257 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:15,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:15,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:15,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:15,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:15,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:15,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,114 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:15,115 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,115 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:24:15,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:15,151 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:15,153 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,159 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:15,159 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:15,159 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:15,159 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:24:15,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:15,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581148100] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:15,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:15,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:15,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776665295] [2021-05-22 02:24:15,177 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:15,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:15,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:15,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:15,177 INFO L87 Difference]: Start difference. First operand 438 states and 1366 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:15,303 INFO L93 Difference]: Finished difference Result 567 states and 1733 transitions. [2021-05-22 02:24:15,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:15,304 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:15,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:15,304 INFO L225 Difference]: With dead ends: 567 [2021-05-22 02:24:15,304 INFO L226 Difference]: Without dead ends: 540 [2021-05-22 02:24:15,304 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 122.8ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:15,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-22 02:24:15,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 435. [2021-05-22 02:24:15,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 3.129032258064516) internal successors, (1358), 434 states have internal predecessors, (1358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 1358 transitions. [2021-05-22 02:24:15,309 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 1358 transitions. Word has length 21 [2021-05-22 02:24:15,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:15,309 INFO L482 AbstractCegarLoop]: Abstraction has 435 states and 1358 transitions. [2021-05-22 02:24:15,309 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,309 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 1358 transitions. [2021-05-22 02:24:15,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:15,310 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:15,310 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:15,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable904,257 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:15,511 INFO L430 AbstractCegarLoop]: === Iteration 269 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:15,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:15,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1699721687, now seen corresponding path program 257 times [2021-05-22 02:24:15,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:15,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193693132] [2021-05-22 02:24:15,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:15,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:15,590 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:15,590 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:15,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193693132] [2021-05-22 02:24:15,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193693132] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:15,590 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129324072] [2021-05-22 02:24:15,590 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 258 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 258 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:15,627 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:15,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:15,628 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:15,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:15,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:15,665 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:15,668 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,676 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:15,676 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:15,676 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:15,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:15,702 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,712 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:15,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:15,714 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:15,722 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:15,722 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:15,722 INFO L518 ElimStorePlain]: Eliminatee v_prenex_31 vanished before elimination [2021-05-22 02:24:15,722 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:15,723 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:24:15,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:15,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129324072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:15,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:15,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:15,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440897748] [2021-05-22 02:24:15,755 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:15,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:15,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:15,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:15,755 INFO L87 Difference]: Start difference. First operand 435 states and 1358 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:15,934 INFO L93 Difference]: Finished difference Result 597 states and 1833 transitions. [2021-05-22 02:24:15,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:15,935 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:15,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:15,936 INFO L225 Difference]: With dead ends: 597 [2021-05-22 02:24:15,936 INFO L226 Difference]: Without dead ends: 568 [2021-05-22 02:24:15,936 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 118.2ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:15,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2021-05-22 02:24:15,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 436. [2021-05-22 02:24:15,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 3.135632183908046) internal successors, (1364), 435 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 1364 transitions. [2021-05-22 02:24:15,940 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 1364 transitions. Word has length 21 [2021-05-22 02:24:15,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:15,940 INFO L482 AbstractCegarLoop]: Abstraction has 436 states and 1364 transitions. [2021-05-22 02:24:15,940 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:15,940 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 1364 transitions. [2021-05-22 02:24:15,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:15,941 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:15,941 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:16,143 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 258 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable908 [2021-05-22 02:24:16,143 INFO L430 AbstractCegarLoop]: === Iteration 270 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:16,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:16,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1686717961, now seen corresponding path program 258 times [2021-05-22 02:24:16,143 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:16,143 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499649871] [2021-05-22 02:24:16,143 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:16,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:16,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:16,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:16,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499649871] [2021-05-22 02:24:16,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499649871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:16,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799707412] [2021-05-22 02:24:16,236 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 259 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 259 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:16,262 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:16,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:16,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:16,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:16,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:16,296 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:16,301 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:16,301 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:16,301 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:24:16,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:16,323 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:16,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:16,325 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:16,333 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:16,334 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:16,334 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:16,334 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:24:16,406 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:16,406 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799707412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:16,406 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:16,406 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:16,406 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033098691] [2021-05-22 02:24:16,406 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:16,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:16,406 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:16,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:16,407 INFO L87 Difference]: Start difference. First operand 436 states and 1364 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:16,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:16,670 INFO L93 Difference]: Finished difference Result 618 states and 1883 transitions. [2021-05-22 02:24:16,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:16,671 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:16,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:16,671 INFO L225 Difference]: With dead ends: 618 [2021-05-22 02:24:16,671 INFO L226 Difference]: Without dead ends: 591 [2021-05-22 02:24:16,671 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 250.6ms TimeCoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:24:16,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2021-05-22 02:24:16,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 434. [2021-05-22 02:24:16,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 433 states have (on average 3.1247113163972284) internal successors, (1353), 433 states have internal predecessors, (1353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:16,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 1353 transitions. [2021-05-22 02:24:16,676 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 1353 transitions. Word has length 21 [2021-05-22 02:24:16,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:16,676 INFO L482 AbstractCegarLoop]: Abstraction has 434 states and 1353 transitions. [2021-05-22 02:24:16,676 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:16,676 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 1353 transitions. [2021-05-22 02:24:16,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:16,677 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:16,677 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:16,877 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 259 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable913 [2021-05-22 02:24:16,877 INFO L430 AbstractCegarLoop]: === Iteration 271 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:16,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:16,878 INFO L82 PathProgramCache]: Analyzing trace with hash -231235301, now seen corresponding path program 259 times [2021-05-22 02:24:16,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:16,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1225870362] [2021-05-22 02:24:16,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:16,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:16,971 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:16,971 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:16,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1225870362] [2021-05-22 02:24:16,971 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1225870362] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:16,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [794614706] [2021-05-22 02:24:16,971 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 260 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 260 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:16,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:16,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:16,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:17,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:17,057 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:17,061 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,061 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:24:17,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:17,076 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,079 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:17,079 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:17,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,080 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:24:17,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:17,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [794614706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:17,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:17,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:17,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663688709] [2021-05-22 02:24:17,091 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:17,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:17,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:17,091 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:17,091 INFO L87 Difference]: Start difference. First operand 434 states and 1353 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:17,222 INFO L93 Difference]: Finished difference Result 588 states and 1799 transitions. [2021-05-22 02:24:17,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:17,222 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:17,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:17,223 INFO L225 Difference]: With dead ends: 588 [2021-05-22 02:24:17,223 INFO L226 Difference]: Without dead ends: 569 [2021-05-22 02:24:17,223 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:17,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-22 02:24:17,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 434. [2021-05-22 02:24:17,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 433 states have (on average 3.1247113163972284) internal successors, (1353), 433 states have internal predecessors, (1353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 1353 transitions. [2021-05-22 02:24:17,228 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 1353 transitions. Word has length 21 [2021-05-22 02:24:17,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:17,228 INFO L482 AbstractCegarLoop]: Abstraction has 434 states and 1353 transitions. [2021-05-22 02:24:17,228 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,228 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 1353 transitions. [2021-05-22 02:24:17,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:17,229 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:17,229 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:17,429 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable922,260 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:17,429 INFO L430 AbstractCegarLoop]: === Iteration 272 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:17,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:17,429 INFO L82 PathProgramCache]: Analyzing trace with hash -851099215, now seen corresponding path program 260 times [2021-05-22 02:24:17,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:17,430 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965020776] [2021-05-22 02:24:17,430 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:17,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:17,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:17,506 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:17,506 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965020776] [2021-05-22 02:24:17,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965020776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:17,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578087260] [2021-05-22 02:24:17,507 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 261 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 261 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:17,532 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:17,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:17,533 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:17,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:17,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:17,566 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,570 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:17,571 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,571 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:24:17,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:24:17,592 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:24:17,594 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:17,602 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:17,602 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:17,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:17,603 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:24:17,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:17,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578087260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:17,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:17,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:17,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [450196544] [2021-05-22 02:24:17,635 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:17,635 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:17,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:17,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:17,635 INFO L87 Difference]: Start difference. First operand 434 states and 1353 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:17,769 INFO L93 Difference]: Finished difference Result 560 states and 1715 transitions. [2021-05-22 02:24:17,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:17,769 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:17,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:17,770 INFO L225 Difference]: With dead ends: 560 [2021-05-22 02:24:17,770 INFO L226 Difference]: Without dead ends: 531 [2021-05-22 02:24:17,770 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 121.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:17,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-05-22 02:24:17,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 432. [2021-05-22 02:24:17,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1276102088167055) internal successors, (1348), 431 states have internal predecessors, (1348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1348 transitions. [2021-05-22 02:24:17,775 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1348 transitions. Word has length 21 [2021-05-22 02:24:17,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:17,775 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1348 transitions. [2021-05-22 02:24:17,775 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:17,775 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1348 transitions. [2021-05-22 02:24:17,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:17,776 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:17,776 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:17,976 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 261 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable925 [2021-05-22 02:24:17,976 INFO L430 AbstractCegarLoop]: === Iteration 273 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:17,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:17,976 INFO L82 PathProgramCache]: Analyzing trace with hash -553832805, now seen corresponding path program 261 times [2021-05-22 02:24:17,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:17,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1489821460] [2021-05-22 02:24:17,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:17,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:18,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:18,073 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:18,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1489821460] [2021-05-22 02:24:18,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1489821460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:18,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1820176911] [2021-05-22 02:24:18,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 262 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 262 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:18,106 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:18,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:18,107 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:18,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:18,184 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_33]} [2021-05-22 02:24:18,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:18,188 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:18,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:18,203 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:18,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:18,204 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:18,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:18,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:18,217 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:24:18,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:18,258 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:18,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:18,259 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:18,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:18,265 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:18,280 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:18,282 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:18,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:18,284 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:18,298 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:18,299 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:18,299 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:62, output treesize:19 [2021-05-22 02:24:18,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:18,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1820176911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:18,369 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:18,369 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:18,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346199236] [2021-05-22 02:24:18,370 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:18,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:18,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:18,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:18,370 INFO L87 Difference]: Start difference. First operand 432 states and 1348 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:18,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:18,771 INFO L93 Difference]: Finished difference Result 738 states and 2235 transitions. [2021-05-22 02:24:18,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:24:18,771 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:18,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:18,772 INFO L225 Difference]: With dead ends: 738 [2021-05-22 02:24:18,773 INFO L226 Difference]: Without dead ends: 715 [2021-05-22 02:24:18,773 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 344.8ms TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:18,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2021-05-22 02:24:18,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 438. [2021-05-22 02:24:18,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.137299771167048) internal successors, (1371), 437 states have internal predecessors, (1371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:18,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1371 transitions. [2021-05-22 02:24:18,778 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1371 transitions. Word has length 21 [2021-05-22 02:24:18,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:18,778 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1371 transitions. [2021-05-22 02:24:18,778 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:18,778 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1371 transitions. [2021-05-22 02:24:18,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:18,778 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:18,778 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:18,979 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable928,262 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:18,979 INFO L430 AbstractCegarLoop]: === Iteration 274 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:18,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:18,979 INFO L82 PathProgramCache]: Analyzing trace with hash -838095489, now seen corresponding path program 262 times [2021-05-22 02:24:18,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:18,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933583397] [2021-05-22 02:24:18,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:18,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:19,063 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:19,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:19,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933583397] [2021-05-22 02:24:19,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933583397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:19,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124326655] [2021-05-22 02:24:19,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 263 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 263 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:19,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:19,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:19,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:19,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:19,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:19,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:19,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:19,132 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:19,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:19,141 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:19,141 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:19,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:19,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:19,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:19,175 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:19,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:19,178 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:19,186 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:19,186 INFO L518 ElimStorePlain]: Eliminatee v_prenex_34 vanished before elimination [2021-05-22 02:24:19,186 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:19,186 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:24:19,256 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:19,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124326655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:19,256 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:19,257 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:19,257 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218456924] [2021-05-22 02:24:19,257 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:19,257 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:19,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:19,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:19,257 INFO L87 Difference]: Start difference. First operand 438 states and 1371 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:19,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:19,546 INFO L93 Difference]: Finished difference Result 660 states and 1997 transitions. [2021-05-22 02:24:19,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:19,546 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:19,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:19,547 INFO L225 Difference]: With dead ends: 660 [2021-05-22 02:24:19,547 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:24:19,547 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 257.3ms TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:19,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:24:19,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 449. [2021-05-22 02:24:19,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.140625) internal successors, (1407), 448 states have internal predecessors, (1407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:19,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1407 transitions. [2021-05-22 02:24:19,552 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1407 transitions. Word has length 21 [2021-05-22 02:24:19,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:19,552 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1407 transitions. [2021-05-22 02:24:19,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:19,552 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1407 transitions. [2021-05-22 02:24:19,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:19,552 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:19,553 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:19,753 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable938,263 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:19,753 INFO L430 AbstractCegarLoop]: === Iteration 275 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:19,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:19,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1496124841, now seen corresponding path program 263 times [2021-05-22 02:24:19,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:19,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388256273] [2021-05-22 02:24:19,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:19,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:19,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:19,869 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:19,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388256273] [2021-05-22 02:24:19,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388256273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:19,869 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342015461] [2021-05-22 02:24:19,869 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 264 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 264 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:19,895 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:19,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:19,895 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:19,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:19,979 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_36]} [2021-05-22 02:24:19,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:19,982 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:19,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:19,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:19,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:19,997 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,009 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:20,010 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:20,010 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:24:20,062 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,062 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:20,063 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,065 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:20,066 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:20,093 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,094 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:20,095 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,097 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:20,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:20,097 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:20,121 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:20,121 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:83, output treesize:31 [2021-05-22 02:24:20,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:20,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342015461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:20,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:20,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:20,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621403051] [2021-05-22 02:24:20,196 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:20,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:20,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:20,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:20,197 INFO L87 Difference]: Start difference. First operand 449 states and 1407 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:20,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:20,571 INFO L93 Difference]: Finished difference Result 698 states and 2134 transitions. [2021-05-22 02:24:20,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:24:20,571 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:20,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:20,572 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:24:20,572 INFO L226 Difference]: Without dead ends: 679 [2021-05-22 02:24:20,572 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 426.2ms TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:20,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-22 02:24:20,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 446. [2021-05-22 02:24:20,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.134831460674157) internal successors, (1395), 445 states have internal predecessors, (1395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:20,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1395 transitions. [2021-05-22 02:24:20,577 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1395 transitions. Word has length 21 [2021-05-22 02:24:20,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:20,577 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1395 transitions. [2021-05-22 02:24:20,578 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:20,578 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1395 transitions. [2021-05-22 02:24:20,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:20,578 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:20,578 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:20,778 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 264 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable949 [2021-05-22 02:24:20,778 INFO L430 AbstractCegarLoop]: === Iteration 276 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:20,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:20,779 INFO L82 PathProgramCache]: Analyzing trace with hash 322512813, now seen corresponding path program 264 times [2021-05-22 02:24:20,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:20,779 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53798364] [2021-05-22 02:24:20,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:20,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:20,870 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:20,870 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:20,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53798364] [2021-05-22 02:24:20,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [53798364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:20,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192997804] [2021-05-22 02:24:20,870 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 265 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 265 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:20,896 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:20,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:20,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:20,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:20,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:20,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:20,953 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:20,961 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:20,962 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:20,962 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:24:20,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:20,996 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:21,000 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:21,000 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,000 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:24:21,042 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:21,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192997804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:21,042 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:21,043 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:24:21,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323257227] [2021-05-22 02:24:21,043 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:24:21,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:21,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:24:21,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:21,043 INFO L87 Difference]: Start difference. First operand 446 states and 1395 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:21,226 INFO L93 Difference]: Finished difference Result 591 states and 1798 transitions. [2021-05-22 02:24:21,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:21,227 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:21,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:21,227 INFO L225 Difference]: With dead ends: 591 [2021-05-22 02:24:21,228 INFO L226 Difference]: Without dead ends: 570 [2021-05-22 02:24:21,228 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 196.4ms TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:21,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-05-22 02:24:21,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 432. [2021-05-22 02:24:21,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1229698375870067) internal successors, (1346), 431 states have internal predecessors, (1346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1346 transitions. [2021-05-22 02:24:21,233 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1346 transitions. Word has length 21 [2021-05-22 02:24:21,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:21,233 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1346 transitions. [2021-05-22 02:24:21,233 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,233 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1346 transitions. [2021-05-22 02:24:21,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:21,233 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:21,233 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:21,434 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable957,265 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:21,434 INFO L430 AbstractCegarLoop]: === Iteration 277 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:21,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:21,434 INFO L82 PathProgramCache]: Analyzing trace with hash -523816653, now seen corresponding path program 265 times [2021-05-22 02:24:21,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:21,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055876754] [2021-05-22 02:24:21,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:21,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:21,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:21,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:21,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055876754] [2021-05-22 02:24:21,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2055876754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:21,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750752323] [2021-05-22 02:24:21,541 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 266 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 266 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:21,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:21,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:21,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:21,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:21,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:21,663 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,670 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:21,672 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:21,672 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:36, output treesize:29 [2021-05-22 02:24:21,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:21,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:21,746 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,752 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:21,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:21,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:21,754 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:21,760 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:21,760 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:9 [2021-05-22 02:24:21,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:21,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750752323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:21,768 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:21,768 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:21,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854765219] [2021-05-22 02:24:21,768 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:21,768 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:21,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:21,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:21,769 INFO L87 Difference]: Start difference. First operand 432 states and 1346 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:21,903 INFO L93 Difference]: Finished difference Result 506 states and 1559 transitions. [2021-05-22 02:24:21,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:21,904 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:21,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:21,904 INFO L225 Difference]: With dead ends: 506 [2021-05-22 02:24:21,904 INFO L226 Difference]: Without dead ends: 484 [2021-05-22 02:24:21,904 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 177.8ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:21,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2021-05-22 02:24:21,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 438. [2021-05-22 02:24:21,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.128146453089245) internal successors, (1367), 437 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1367 transitions. [2021-05-22 02:24:21,909 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1367 transitions. Word has length 21 [2021-05-22 02:24:21,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:21,909 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1367 transitions. [2021-05-22 02:24:21,909 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:21,909 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1367 transitions. [2021-05-22 02:24:21,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:21,909 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:21,909 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:22,110 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 266 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable960 [2021-05-22 02:24:22,110 INFO L430 AbstractCegarLoop]: === Iteration 278 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:22,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:22,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1025607989, now seen corresponding path program 266 times [2021-05-22 02:24:22,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:22,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436046330] [2021-05-22 02:24:22,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:22,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:22,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:22,208 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:22,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436046330] [2021-05-22 02:24:22,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [436046330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:22,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [680042436] [2021-05-22 02:24:22,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 267 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 267 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:22,235 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:22,235 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:22,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:22,236 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:22,329 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:22,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:22,331 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,339 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:22,342 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:22,342 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:32 [2021-05-22 02:24:22,370 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:22,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:22,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,380 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:22,382 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:22,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:22,382 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:22,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,391 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:24:22,403 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:22,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [680042436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:22,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:22,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:22,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210320741] [2021-05-22 02:24:22,404 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:22,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:22,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:22,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:22,404 INFO L87 Difference]: Start difference. First operand 438 states and 1367 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:22,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:22,515 INFO L93 Difference]: Finished difference Result 515 states and 1583 transitions. [2021-05-22 02:24:22,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:22,515 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:22,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:22,516 INFO L225 Difference]: With dead ends: 515 [2021-05-22 02:24:22,516 INFO L226 Difference]: Without dead ends: 493 [2021-05-22 02:24:22,516 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 158.0ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:22,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 493 states. [2021-05-22 02:24:22,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 493 to 435. [2021-05-22 02:24:22,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 3.122119815668203) internal successors, (1355), 434 states have internal predecessors, (1355), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:22,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 1355 transitions. [2021-05-22 02:24:22,521 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 1355 transitions. Word has length 21 [2021-05-22 02:24:22,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:22,521 INFO L482 AbstractCegarLoop]: Abstraction has 435 states and 1355 transitions. [2021-05-22 02:24:22,521 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:22,521 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 1355 transitions. [2021-05-22 02:24:22,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:22,522 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:22,522 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:22,722 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable967,267 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:22,722 INFO L430 AbstractCegarLoop]: === Iteration 279 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:22,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:22,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1162575187, now seen corresponding path program 267 times [2021-05-22 02:24:22,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:22,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860515082] [2021-05-22 02:24:22,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:22,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:22,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:22,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:22,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860515082] [2021-05-22 02:24:22,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860515082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:22,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039770712] [2021-05-22 02:24:22,833 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 268 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 268 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:22,860 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:22,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:22,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:22,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:22,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:22,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:22,952 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,958 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:22,959 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:22,959 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:24:22,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:22,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:22,986 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:22,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:23,013 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:23,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:23,014 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,022 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:23,023 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,023 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:24:23,036 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:23,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039770712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:23,036 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:23,036 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:23,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723396520] [2021-05-22 02:24:23,036 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:23,036 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:23,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:23,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:23,036 INFO L87 Difference]: Start difference. First operand 435 states and 1355 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:23,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:23,173 INFO L93 Difference]: Finished difference Result 503 states and 1550 transitions. [2021-05-22 02:24:23,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:23,173 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:23,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:23,174 INFO L225 Difference]: With dead ends: 503 [2021-05-22 02:24:23,174 INFO L226 Difference]: Without dead ends: 481 [2021-05-22 02:24:23,174 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 163.6ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:23,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-05-22 02:24:23,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 432. [2021-05-22 02:24:23,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1229698375870067) internal successors, (1346), 431 states have internal predecessors, (1346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:23,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1346 transitions. [2021-05-22 02:24:23,178 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1346 transitions. Word has length 21 [2021-05-22 02:24:23,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:23,178 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1346 transitions. [2021-05-22 02:24:23,178 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:23,178 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1346 transitions. [2021-05-22 02:24:23,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:23,179 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:23,179 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:23,379 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 268 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable970 [2021-05-22 02:24:23,379 INFO L430 AbstractCegarLoop]: === Iteration 280 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:23,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:23,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1459153209, now seen corresponding path program 268 times [2021-05-22 02:24:23,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:23,380 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101212012] [2021-05-22 02:24:23,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:23,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:23,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:23,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:23,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101212012] [2021-05-22 02:24:23,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101212012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:23,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841460094] [2021-05-22 02:24:23,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 269 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 269 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:23,529 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:23,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:23,530 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:23,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:23,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:23,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:23,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:23,616 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:23,616 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:24:23,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:23,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:23,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:23,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:23,718 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:23,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:23,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:23,735 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:23,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:23,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:23,749 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:5 [2021-05-22 02:24:23,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:23,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841460094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:23,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:23,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:23,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317131068] [2021-05-22 02:24:23,775 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:23,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:23,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:23,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:23,775 INFO L87 Difference]: Start difference. First operand 432 states and 1346 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:24,088 INFO L93 Difference]: Finished difference Result 714 states and 2156 transitions. [2021-05-22 02:24:24,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:24:24,088 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:24,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:24,089 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:24:24,089 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:24:24,089 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 302.1ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:24,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:24:24,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 430. [2021-05-22 02:24:24,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.125874125874126) internal successors, (1341), 429 states have internal predecessors, (1341), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1341 transitions. [2021-05-22 02:24:24,094 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1341 transitions. Word has length 21 [2021-05-22 02:24:24,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:24,094 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1341 transitions. [2021-05-22 02:24:24,094 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,094 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1341 transitions. [2021-05-22 02:24:24,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:24,094 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:24,094 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:24,295 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 269 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable973 [2021-05-22 02:24:24,295 INFO L430 AbstractCegarLoop]: === Iteration 281 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:24,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:24,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1399639067, now seen corresponding path program 269 times [2021-05-22 02:24:24,295 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:24,295 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [385948984] [2021-05-22 02:24:24,295 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:24,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:24,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:24,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:24,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [385948984] [2021-05-22 02:24:24,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [385948984] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:24,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210938040] [2021-05-22 02:24:24,397 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 270 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 270 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:24,423 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:24,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:24,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:24,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:24,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:24,500 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:24,502 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:24,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:24,503 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:24,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:24,520 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:24,520 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:24:24,634 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:24,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:24,635 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:24,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:24,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:24,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:24,643 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:24,648 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:24,649 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:24,649 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:9 [2021-05-22 02:24:24,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:24,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210938040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:24,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:24,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:24,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [589266283] [2021-05-22 02:24:24,657 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:24,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:24,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:24,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:24,657 INFO L87 Difference]: Start difference. First operand 430 states and 1341 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:24,812 INFO L93 Difference]: Finished difference Result 553 states and 1701 transitions. [2021-05-22 02:24:24,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:24,813 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:24,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:24,813 INFO L225 Difference]: With dead ends: 553 [2021-05-22 02:24:24,813 INFO L226 Difference]: Without dead ends: 531 [2021-05-22 02:24:24,814 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 182.2ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:24,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 531 states. [2021-05-22 02:24:24,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 531 to 436. [2021-05-22 02:24:24,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 3.135632183908046) internal successors, (1364), 435 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 1364 transitions. [2021-05-22 02:24:24,818 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 1364 transitions. Word has length 21 [2021-05-22 02:24:24,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:24,818 INFO L482 AbstractCegarLoop]: Abstraction has 436 states and 1364 transitions. [2021-05-22 02:24:24,818 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:24,819 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 1364 transitions. [2021-05-22 02:24:24,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:24,819 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:24,819 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:25,019 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable987,270 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:25,019 INFO L430 AbstractCegarLoop]: === Iteration 282 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:25,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:25,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1901430403, now seen corresponding path program 270 times [2021-05-22 02:24:25,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:25,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731235556] [2021-05-22 02:24:25,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:25,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:25,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:25,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:25,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731235556] [2021-05-22 02:24:25,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731235556] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:25,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308046717] [2021-05-22 02:24:25,122 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 271 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 271 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:25,147 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:24:25,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:25,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:25,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:25,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:25,221 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,222 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:25,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:25,223 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,238 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:25,241 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:25,241 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:24:25,311 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:25,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:25,312 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:25,321 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:25,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:25,322 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,328 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:25,329 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,329 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:12 [2021-05-22 02:24:25,341 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:25,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308046717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:25,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:25,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:25,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95937224] [2021-05-22 02:24:25,341 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:25,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:25,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:25,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:25,342 INFO L87 Difference]: Start difference. First operand 436 states and 1364 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:25,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:25,510 INFO L93 Difference]: Finished difference Result 544 states and 1677 transitions. [2021-05-22 02:24:25,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:25,510 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:25,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:25,511 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:24:25,511 INFO L226 Difference]: Without dead ends: 522 [2021-05-22 02:24:25,511 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 166.9ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:25,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-05-22 02:24:25,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 433. [2021-05-22 02:24:25,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 3.1296296296296298) internal successors, (1352), 432 states have internal predecessors, (1352), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:25,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 1352 transitions. [2021-05-22 02:24:25,516 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 1352 transitions. Word has length 21 [2021-05-22 02:24:25,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:25,516 INFO L482 AbstractCegarLoop]: Abstraction has 433 states and 1352 transitions. [2021-05-22 02:24:25,516 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:25,516 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 1352 transitions. [2021-05-22 02:24:25,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:25,516 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:25,516 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:25,717 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 271 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable996 [2021-05-22 02:24:25,717 INFO L430 AbstractCegarLoop]: === Iteration 283 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:25,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:25,717 INFO L82 PathProgramCache]: Analyzing trace with hash -774314949, now seen corresponding path program 271 times [2021-05-22 02:24:25,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:25,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [310246742] [2021-05-22 02:24:25,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:25,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:25,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:25,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:25,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [310246742] [2021-05-22 02:24:25,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [310246742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:25,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2094421399] [2021-05-22 02:24:25,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 272 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 272 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:25,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:25,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:25,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:25,916 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:25,917 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:25,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:25,918 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:25,920 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:25,937 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:25,939 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:25,939 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:26,075 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:26,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:26,076 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,083 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:26,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:26,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:26,085 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:26,092 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,092 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:24:26,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:26,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2094421399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:26,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:26,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:26,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296209162] [2021-05-22 02:24:26,100 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:26,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:26,100 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:26,100 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:26,100 INFO L87 Difference]: Start difference. First operand 433 states and 1352 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:26,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:26,272 INFO L93 Difference]: Finished difference Result 537 states and 1630 transitions. [2021-05-22 02:24:26,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:26,273 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:26,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:26,274 INFO L225 Difference]: With dead ends: 537 [2021-05-22 02:24:26,274 INFO L226 Difference]: Without dead ends: 518 [2021-05-22 02:24:26,274 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 195.9ms TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:26,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-22 02:24:26,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 432. [2021-05-22 02:24:26,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1299303944315544) internal successors, (1349), 431 states have internal predecessors, (1349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:26,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1349 transitions. [2021-05-22 02:24:26,278 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1349 transitions. Word has length 21 [2021-05-22 02:24:26,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:26,278 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1349 transitions. [2021-05-22 02:24:26,278 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:26,278 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1349 transitions. [2021-05-22 02:24:26,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:26,279 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:26,279 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:26,479 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1001,272 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:26,479 INFO L430 AbstractCegarLoop]: === Iteration 284 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:26,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:26,480 INFO L82 PathProgramCache]: Analyzing trace with hash -996523561, now seen corresponding path program 272 times [2021-05-22 02:24:26,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:26,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623748351] [2021-05-22 02:24:26,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:26,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:26,596 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:26,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:26,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623748351] [2021-05-22 02:24:26,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623748351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:26,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1080427765] [2021-05-22 02:24:26,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 273 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 273 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:26,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:26,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:26,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:26,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:26,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:26,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:26,671 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,680 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:26,682 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:26,682 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:43, output treesize:36 [2021-05-22 02:24:26,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:26,836 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,837 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:26,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:26,838 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,850 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:26,852 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:26,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:26,852 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:26,863 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:26,864 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:26,864 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:55, output treesize:5 [2021-05-22 02:24:26,890 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:26,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1080427765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:26,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:26,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:26,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [529620129] [2021-05-22 02:24:26,890 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:26,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:26,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:26,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:26,891 INFO L87 Difference]: Start difference. First operand 432 states and 1349 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:27,154 INFO L93 Difference]: Finished difference Result 674 states and 2029 transitions. [2021-05-22 02:24:27,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:24:27,154 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:27,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:27,155 INFO L225 Difference]: With dead ends: 674 [2021-05-22 02:24:27,155 INFO L226 Difference]: Without dead ends: 614 [2021-05-22 02:24:27,155 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 253.6ms TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:27,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-05-22 02:24:27,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 432. [2021-05-22 02:24:27,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1229698375870067) internal successors, (1346), 431 states have internal predecessors, (1346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1346 transitions. [2021-05-22 02:24:27,160 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1346 transitions. Word has length 21 [2021-05-22 02:24:27,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:27,160 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1346 transitions. [2021-05-22 02:24:27,160 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,160 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1346 transitions. [2021-05-22 02:24:27,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:27,161 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:27,161 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:27,361 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 273 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1018 [2021-05-22 02:24:27,361 INFO L430 AbstractCegarLoop]: === Iteration 285 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:27,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:27,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1086051491, now seen corresponding path program 273 times [2021-05-22 02:24:27,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:27,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677482659] [2021-05-22 02:24:27,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:27,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:27,471 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:27,471 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:27,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677482659] [2021-05-22 02:24:27,471 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677482659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:27,471 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69303451] [2021-05-22 02:24:27,471 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 274 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 274 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:27,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:27,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:27,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:27,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:27,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:27,587 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:27,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:27,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:27,591 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:27,608 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:27,610 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:27,611 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:27,694 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:27,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:27,696 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:27,705 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:27,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:27,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:27,708 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:27,717 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:27,717 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:27,717 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:24:27,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:27,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69303451] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:27,759 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:27,759 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:27,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1989043015] [2021-05-22 02:24:27,759 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:27,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:27,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:27,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:27,759 INFO L87 Difference]: Start difference. First operand 432 states and 1346 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:27,943 INFO L93 Difference]: Finished difference Result 569 states and 1730 transitions. [2021-05-22 02:24:27,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:27,943 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:27,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:27,944 INFO L225 Difference]: With dead ends: 569 [2021-05-22 02:24:27,944 INFO L226 Difference]: Without dead ends: 550 [2021-05-22 02:24:27,944 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 221.3ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:27,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 550 states. [2021-05-22 02:24:27,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 550 to 419. [2021-05-22 02:24:27,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 418 states have (on average 3.1052631578947367) internal successors, (1298), 418 states have internal predecessors, (1298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 1298 transitions. [2021-05-22 02:24:27,952 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 1298 transitions. Word has length 21 [2021-05-22 02:24:27,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:27,953 INFO L482 AbstractCegarLoop]: Abstraction has 419 states and 1298 transitions. [2021-05-22 02:24:27,953 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:27,953 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 1298 transitions. [2021-05-22 02:24:27,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:27,953 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:27,953 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:28,153 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 274 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1034 [2021-05-22 02:24:28,154 INFO L430 AbstractCegarLoop]: === Iteration 286 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:28,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:28,154 INFO L82 PathProgramCache]: Analyzing trace with hash 1479953917, now seen corresponding path program 274 times [2021-05-22 02:24:28,154 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:28,154 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1017605068] [2021-05-22 02:24:28,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:28,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:28,257 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:28,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:28,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1017605068] [2021-05-22 02:24:28,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1017605068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:28,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769463058] [2021-05-22 02:24:28,258 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 275 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 275 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:28,283 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:28,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:28,284 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:28,284 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:28,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:28,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:28,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:28,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:28,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:28,362 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:28,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:28,381 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:28,381 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:24:28,477 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_38, v_prenex_37], 1=[o_2, o_4]} [2021-05-22 02:24:28,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:28,480 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:28,492 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:28,492 INFO L518 ElimStorePlain]: Eliminatee v_prenex_37 vanished before elimination [2021-05-22 02:24:28,493 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:28,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:28,494 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:28,504 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:28,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:28,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:28,506 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:28,515 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:28,516 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:28,516 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:48, output treesize:15 [2021-05-22 02:24:28,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:28,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769463058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:28,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:28,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:28,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467545772] [2021-05-22 02:24:28,541 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:28,541 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:28,541 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:28,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:28,542 INFO L87 Difference]: Start difference. First operand 419 states and 1298 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:28,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:28,703 INFO L93 Difference]: Finished difference Result 550 states and 1683 transitions. [2021-05-22 02:24:28,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:28,704 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:28,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:28,704 INFO L225 Difference]: With dead ends: 550 [2021-05-22 02:24:28,704 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:24:28,704 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 183.3ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:28,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:24:28,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 419. [2021-05-22 02:24:28,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 418 states have (on average 3.1052631578947367) internal successors, (1298), 418 states have internal predecessors, (1298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:28,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 1298 transitions. [2021-05-22 02:24:28,709 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 1298 transitions. Word has length 21 [2021-05-22 02:24:28,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:28,709 INFO L482 AbstractCegarLoop]: Abstraction has 419 states and 1298 transitions. [2021-05-22 02:24:28,709 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:28,709 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 1298 transitions. [2021-05-22 02:24:28,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:28,709 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:28,709 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:28,910 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1040,275 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:28,910 INFO L430 AbstractCegarLoop]: === Iteration 287 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:28,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:28,910 INFO L82 PathProgramCache]: Analyzing trace with hash 385254999, now seen corresponding path program 275 times [2021-05-22 02:24:28,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:28,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2024891733] [2021-05-22 02:24:28,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:28,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:29,034 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:29,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:29,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2024891733] [2021-05-22 02:24:29,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2024891733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:29,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [561771269] [2021-05-22 02:24:29,034 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 276 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 276 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:29,060 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:29,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:29,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:29,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:29,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:29,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:29,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:29,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:29,122 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:29,123 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:24:29,218 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:29,218 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:29,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:29,219 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:29,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:29,222 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:29,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:29,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:29,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:29,251 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:29,268 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:29,269 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:29,269 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:24:29,318 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:29,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [561771269] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:29,318 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:29,318 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:29,319 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397206521] [2021-05-22 02:24:29,319 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:29,319 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:29,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:29,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:29,319 INFO L87 Difference]: Start difference. First operand 419 states and 1298 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:29,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:29,740 INFO L93 Difference]: Finished difference Result 747 states and 2235 transitions. [2021-05-22 02:24:29,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:24:29,741 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:29,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:29,741 INFO L225 Difference]: With dead ends: 747 [2021-05-22 02:24:29,741 INFO L226 Difference]: Without dead ends: 693 [2021-05-22 02:24:29,742 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 381.5ms TimeCoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:29,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-05-22 02:24:29,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 420. [2021-05-22 02:24:29,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 419 states have (on average 3.1288782816229115) internal successors, (1311), 419 states have internal predecessors, (1311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:29,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 1311 transitions. [2021-05-22 02:24:29,747 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 1311 transitions. Word has length 21 [2021-05-22 02:24:29,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:29,747 INFO L482 AbstractCegarLoop]: Abstraction has 420 states and 1311 transitions. [2021-05-22 02:24:29,747 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:29,747 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 1311 transitions. [2021-05-22 02:24:29,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:29,747 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:29,748 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:29,948 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 276 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1050 [2021-05-22 02:24:29,948 INFO L430 AbstractCegarLoop]: === Iteration 288 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:29,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:29,948 INFO L82 PathProgramCache]: Analyzing trace with hash -239030765, now seen corresponding path program 276 times [2021-05-22 02:24:29,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:29,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3412525] [2021-05-22 02:24:29,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:29,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:30,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:30,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:30,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3412525] [2021-05-22 02:24:30,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3412525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:30,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1956207818] [2021-05-22 02:24:30,074 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 277 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 277 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:30,100 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:24:30,100 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:30,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:30,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:30,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,175 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:30,176 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:30,179 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,197 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:30,197 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:30,247 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_40, v_prenex_39]} [2021-05-22 02:24:30,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:30,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,264 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,264 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:30,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:30,267 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,280 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,282 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:30,283 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,296 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:30,296 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:59, output treesize:21 [2021-05-22 02:24:30,329 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:30,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1956207818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:30,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:30,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:30,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79644767] [2021-05-22 02:24:30,330 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:30,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:30,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:30,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:30,330 INFO L87 Difference]: Start difference. First operand 420 states and 1311 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:30,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:30,501 INFO L93 Difference]: Finished difference Result 554 states and 1699 transitions. [2021-05-22 02:24:30,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:30,502 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:30,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:30,502 INFO L225 Difference]: With dead ends: 554 [2021-05-22 02:24:30,502 INFO L226 Difference]: Without dead ends: 525 [2021-05-22 02:24:30,503 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 197.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:30,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-05-22 02:24:30,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 420. [2021-05-22 02:24:30,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 419 states have (on average 3.1288782816229115) internal successors, (1311), 419 states have internal predecessors, (1311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:30,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 1311 transitions. [2021-05-22 02:24:30,507 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 1311 transitions. Word has length 21 [2021-05-22 02:24:30,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:30,507 INFO L482 AbstractCegarLoop]: Abstraction has 420 states and 1311 transitions. [2021-05-22 02:24:30,507 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:30,507 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 1311 transitions. [2021-05-22 02:24:30,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:30,508 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:30,508 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:30,708 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1063,277 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:30,708 INFO L430 AbstractCegarLoop]: === Iteration 289 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:30,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:30,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1230358977, now seen corresponding path program 277 times [2021-05-22 02:24:30,708 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:30,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1336267713] [2021-05-22 02:24:30,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:30,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:30,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:30,824 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:30,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1336267713] [2021-05-22 02:24:30,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1336267713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:30,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020299094] [2021-05-22 02:24:30,824 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 278 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 278 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:30,849 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:30,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:30,896 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:30,897 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,907 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:30,910 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:24:30,955 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,955 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:30,956 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:30,959 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:30,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:30,983 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:30,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:30,984 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,005 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:31,006 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:31,006 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:81, output treesize:19 [2021-05-22 02:24:31,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:31,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020299094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:31,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:31,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:31,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [54343156] [2021-05-22 02:24:31,080 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:31,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:31,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:31,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:31,080 INFO L87 Difference]: Start difference. First operand 420 states and 1311 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:31,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:31,456 INFO L93 Difference]: Finished difference Result 673 states and 2025 transitions. [2021-05-22 02:24:31,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:24:31,456 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:31,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:31,457 INFO L225 Difference]: With dead ends: 673 [2021-05-22 02:24:31,457 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:24:31,457 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 355.8ms TimeCoverageRelationStatistics Valid=113, Invalid=439, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:31,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:24:31,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 415. [2021-05-22 02:24:31,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.103864734299517) internal successors, (1285), 414 states have internal predecessors, (1285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:31,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1285 transitions. [2021-05-22 02:24:31,462 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1285 transitions. Word has length 21 [2021-05-22 02:24:31,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:31,462 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1285 transitions. [2021-05-22 02:24:31,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:31,462 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1285 transitions. [2021-05-22 02:24:31,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:31,462 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:31,463 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:31,663 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 278 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1070 [2021-05-22 02:24:31,663 INFO L430 AbstractCegarLoop]: === Iteration 290 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:31,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:31,663 INFO L82 PathProgramCache]: Analyzing trace with hash 1157356413, now seen corresponding path program 278 times [2021-05-22 02:24:31,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:31,663 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548604273] [2021-05-22 02:24:31,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:31,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:31,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:31,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:31,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548604273] [2021-05-22 02:24:31,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548604273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:31,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [248473324] [2021-05-22 02:24:31,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 279 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 279 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:31,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:31,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:31,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:31,792 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:31,860 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_41]} [2021-05-22 02:24:31,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:31,863 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:31,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:31,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:31,880 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,892 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:31,893 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:31,893 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:24:31,957 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:31,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:31,958 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,967 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:31,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:31,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:31,969 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,976 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:31,977 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:31,977 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:24:31,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:31,990 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [248473324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:31,990 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:31,990 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:31,990 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1746586317] [2021-05-22 02:24:31,990 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:31,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:31,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:31,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:31,990 INFO L87 Difference]: Start difference. First operand 415 states and 1285 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:32,154 INFO L93 Difference]: Finished difference Result 526 states and 1607 transitions. [2021-05-22 02:24:32,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:32,154 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:32,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:32,155 INFO L225 Difference]: With dead ends: 526 [2021-05-22 02:24:32,155 INFO L226 Difference]: Without dead ends: 504 [2021-05-22 02:24:32,155 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 169.1ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:32,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-05-22 02:24:32,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 415. [2021-05-22 02:24:32,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.103864734299517) internal successors, (1285), 414 states have internal predecessors, (1285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1285 transitions. [2021-05-22 02:24:32,159 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1285 transitions. Word has length 21 [2021-05-22 02:24:32,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:32,159 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1285 transitions. [2021-05-22 02:24:32,159 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,159 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1285 transitions. [2021-05-22 02:24:32,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:32,160 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:32,160 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:32,360 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1080,279 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:32,360 INFO L430 AbstractCegarLoop]: === Iteration 291 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:32,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:32,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1087653237, now seen corresponding path program 279 times [2021-05-22 02:24:32,360 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:32,360 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364851524] [2021-05-22 02:24:32,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:32,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:32,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:32,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:32,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364851524] [2021-05-22 02:24:32,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364851524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:32,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174561928] [2021-05-22 02:24:32,455 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 280 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 280 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:32,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:24:32,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:32,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:32,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:32,554 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_42]} [2021-05-22 02:24:32,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:32,557 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:32,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:32,573 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:32,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:32,574 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:32,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:32,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:32,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:24:32,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:32,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:32,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:32,639 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:32,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:32,642 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:32,658 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:32,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:32,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:32,661 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:32,675 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:32,676 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:32,676 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:24:32,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:32,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174561928] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:32,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:32,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:32,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [989559925] [2021-05-22 02:24:32,716 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:32,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:32,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:32,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:32,716 INFO L87 Difference]: Start difference. First operand 415 states and 1285 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:32,850 INFO L93 Difference]: Finished difference Result 541 states and 1656 transitions. [2021-05-22 02:24:32,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:32,850 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:32,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:32,851 INFO L225 Difference]: With dead ends: 541 [2021-05-22 02:24:32,851 INFO L226 Difference]: Without dead ends: 512 [2021-05-22 02:24:32,851 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 160.5ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:32,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-05-22 02:24:32,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 415. [2021-05-22 02:24:32,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.103864734299517) internal successors, (1285), 414 states have internal predecessors, (1285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1285 transitions. [2021-05-22 02:24:32,855 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1285 transitions. Word has length 21 [2021-05-22 02:24:32,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:32,855 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1285 transitions. [2021-05-22 02:24:32,855 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:32,855 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1285 transitions. [2021-05-22 02:24:32,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:32,856 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:32,856 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:33,056 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1085,280 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:33,056 INFO L430 AbstractCegarLoop]: === Iteration 292 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:33,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:33,056 INFO L82 PathProgramCache]: Analyzing trace with hash -790386827, now seen corresponding path program 280 times [2021-05-22 02:24:33,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:33,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546434922] [2021-05-22 02:24:33,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:33,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:33,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:33,168 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:33,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546434922] [2021-05-22 02:24:33,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546434922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:33,168 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588169184] [2021-05-22 02:24:33,168 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 281 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 281 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:33,192 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:33,192 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:33,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:33,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:33,239 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:33,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:33,240 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:33,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:33,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:33,249 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:24:33,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:33,297 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:33,299 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:33,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:33,299 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:33,328 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:33,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:33,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:33,332 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:33,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:33,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:33,349 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:24:33,423 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:33,423 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588169184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:33,423 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:33,423 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:33,423 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420416361] [2021-05-22 02:24:33,423 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:33,423 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:33,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:33,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:33,424 INFO L87 Difference]: Start difference. First operand 415 states and 1285 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:33,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:33,636 INFO L93 Difference]: Finished difference Result 560 states and 1702 transitions. [2021-05-22 02:24:33,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:33,637 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:33,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:33,637 INFO L225 Difference]: With dead ends: 560 [2021-05-22 02:24:33,637 INFO L226 Difference]: Without dead ends: 537 [2021-05-22 02:24:33,637 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 226.7ms TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:24:33,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-05-22 02:24:33,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 414. [2021-05-22 02:24:33,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 413 states have (on average 3.1138014527845037) internal successors, (1286), 413 states have internal predecessors, (1286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:33,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 1286 transitions. [2021-05-22 02:24:33,642 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 1286 transitions. Word has length 21 [2021-05-22 02:24:33,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:33,642 INFO L482 AbstractCegarLoop]: Abstraction has 414 states and 1286 transitions. [2021-05-22 02:24:33,642 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:33,642 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 1286 transitions. [2021-05-22 02:24:33,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:33,642 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:33,642 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:33,843 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 281 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1092 [2021-05-22 02:24:33,843 INFO L430 AbstractCegarLoop]: === Iteration 293 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:33,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:33,843 INFO L82 PathProgramCache]: Analyzing trace with hash -1074649511, now seen corresponding path program 281 times [2021-05-22 02:24:33,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:33,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256677822] [2021-05-22 02:24:33,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:33,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:33,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:33,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:33,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256677822] [2021-05-22 02:24:33,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256677822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:33,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280819001] [2021-05-22 02:24:33,959 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 282 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 282 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:33,985 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:33,985 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:33,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:33,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:34,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:34,043 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:34,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:34,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:34,046 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:34,063 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:34,064 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:34,064 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:48 [2021-05-22 02:24:34,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:34,114 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:34,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:34,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:34,116 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:34,132 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:34,134 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:34,135 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:34,135 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:34,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:34,151 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:34,151 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:73, output treesize:22 [2021-05-22 02:24:34,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:34,225 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280819001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:34,225 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:34,225 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:34,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778170359] [2021-05-22 02:24:34,225 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:34,225 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:34,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:34,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:34,225 INFO L87 Difference]: Start difference. First operand 414 states and 1286 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:34,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:34,656 INFO L93 Difference]: Finished difference Result 664 states and 1996 transitions. [2021-05-22 02:24:34,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:24:34,657 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:34,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:34,658 INFO L225 Difference]: With dead ends: 664 [2021-05-22 02:24:34,658 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:24:34,658 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 437.9ms TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:24:34,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:24:34,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 425. [2021-05-22 02:24:34,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1179245283018866) internal successors, (1322), 424 states have internal predecessors, (1322), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:34,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1322 transitions. [2021-05-22 02:24:34,662 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1322 transitions. Word has length 21 [2021-05-22 02:24:34,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:34,663 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1322 transitions. [2021-05-22 02:24:34,663 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:34,663 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1322 transitions. [2021-05-22 02:24:34,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:34,663 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:34,663 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:34,863 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 282 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1101 [2021-05-22 02:24:34,864 INFO L430 AbstractCegarLoop]: === Iteration 294 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:34,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:34,864 INFO L82 PathProgramCache]: Analyzing trace with hash 1001040279, now seen corresponding path program 282 times [2021-05-22 02:24:34,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:34,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259616890] [2021-05-22 02:24:34,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:34,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:34,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:34,966 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:34,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259616890] [2021-05-22 02:24:34,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259616890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:34,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109240123] [2021-05-22 02:24:34,966 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 283 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 283 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:34,991 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:34,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:34,991 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:34,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:35,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:35,050 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:35,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:35,053 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,070 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:35,071 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:35,071 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:48 [2021-05-22 02:24:35,132 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:35,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:35,133 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,142 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:35,144 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:35,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:35,144 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,152 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:35,153 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,153 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:10 [2021-05-22 02:24:35,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:35,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109240123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:35,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:35,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:35,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547519536] [2021-05-22 02:24:35,198 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:35,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:35,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:35,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:35,198 INFO L87 Difference]: Start difference. First operand 425 states and 1322 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:35,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:35,477 INFO L93 Difference]: Finished difference Result 581 states and 1758 transitions. [2021-05-22 02:24:35,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:35,477 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:35,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:35,478 INFO L225 Difference]: With dead ends: 581 [2021-05-22 02:24:35,478 INFO L226 Difference]: Without dead ends: 560 [2021-05-22 02:24:35,478 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 299.2ms TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:24:35,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-05-22 02:24:35,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 408. [2021-05-22 02:24:35,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 408 states, 407 states have (on average 3.0933660933660936) internal successors, (1259), 407 states have internal predecessors, (1259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:35,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 1259 transitions. [2021-05-22 02:24:35,482 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 1259 transitions. Word has length 21 [2021-05-22 02:24:35,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:35,482 INFO L482 AbstractCegarLoop]: Abstraction has 408 states and 1259 transitions. [2021-05-22 02:24:35,483 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:35,483 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 1259 transitions. [2021-05-22 02:24:35,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:35,483 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:35,483 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:35,683 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 283 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1114 [2021-05-22 02:24:35,684 INFO L430 AbstractCegarLoop]: === Iteration 295 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:35,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:35,684 INFO L82 PathProgramCache]: Analyzing trace with hash -324653355, now seen corresponding path program 283 times [2021-05-22 02:24:35,684 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:35,684 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589520026] [2021-05-22 02:24:35,684 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:35,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:35,800 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:35,800 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:35,800 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589520026] [2021-05-22 02:24:35,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589520026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:35,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496026126] [2021-05-22 02:24:35,801 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 284 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 284 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:35,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:35,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:35,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:35,899 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:35,900 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:35,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:35,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:35,904 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:35,920 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:35,922 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:35,922 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:36,046 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:36,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:36,047 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,054 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:36,055 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:36,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:36,056 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,062 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:36,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,063 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:24:36,071 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:36,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496026126] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:36,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:36,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:36,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [363999218] [2021-05-22 02:24:36,071 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:36,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:36,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:36,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:36,071 INFO L87 Difference]: Start difference. First operand 408 states and 1259 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:36,262 INFO L93 Difference]: Finished difference Result 494 states and 1507 transitions. [2021-05-22 02:24:36,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:36,262 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:36,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:36,263 INFO L225 Difference]: With dead ends: 494 [2021-05-22 02:24:36,263 INFO L226 Difference]: Without dead ends: 472 [2021-05-22 02:24:36,263 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 185.5ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:36,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2021-05-22 02:24:36,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 418. [2021-05-22 02:24:36,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 417 states have (on average 3.105515587529976) internal successors, (1295), 417 states have internal predecessors, (1295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 1295 transitions. [2021-05-22 02:24:36,267 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 1295 transitions. Word has length 21 [2021-05-22 02:24:36,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:36,267 INFO L482 AbstractCegarLoop]: Abstraction has 418 states and 1295 transitions. [2021-05-22 02:24:36,268 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,268 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 1295 transitions. [2021-05-22 02:24:36,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:36,268 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:36,268 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:36,468 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1119,284 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:36,469 INFO L430 AbstractCegarLoop]: === Iteration 296 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:36,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:36,469 INFO L82 PathProgramCache]: Analyzing trace with hash -826444691, now seen corresponding path program 284 times [2021-05-22 02:24:36,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:36,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237840206] [2021-05-22 02:24:36,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:36,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:36,560 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:36,560 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:36,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237840206] [2021-05-22 02:24:36,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237840206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:36,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [321907625] [2021-05-22 02:24:36,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 285 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 285 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:36,588 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:36,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:36,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:36,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:36,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:36,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:36,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:36,660 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:36,679 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:36,679 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:36,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:36,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:36,748 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:36,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:36,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:36,761 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,769 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:36,770 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:36,770 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:15 [2021-05-22 02:24:36,783 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:36,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [321907625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:36,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:36,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:36,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806177237] [2021-05-22 02:24:36,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:36,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:36,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:36,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:36,784 INFO L87 Difference]: Start difference. First operand 418 states and 1295 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:36,955 INFO L93 Difference]: Finished difference Result 503 states and 1531 transitions. [2021-05-22 02:24:36,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:36,955 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:36,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:36,956 INFO L225 Difference]: With dead ends: 503 [2021-05-22 02:24:36,956 INFO L226 Difference]: Without dead ends: 481 [2021-05-22 02:24:36,956 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 147.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:36,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 481 states. [2021-05-22 02:24:36,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 481 to 415. [2021-05-22 02:24:36,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.0990338164251208) internal successors, (1283), 414 states have internal predecessors, (1283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1283 transitions. [2021-05-22 02:24:36,960 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1283 transitions. Word has length 21 [2021-05-22 02:24:36,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:36,960 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1283 transitions. [2021-05-22 02:24:36,961 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:36,961 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1283 transitions. [2021-05-22 02:24:36,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:36,961 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:36,961 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:37,161 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 285 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1132 [2021-05-22 02:24:37,162 INFO L430 AbstractCegarLoop]: === Iteration 297 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:37,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:37,162 INFO L82 PathProgramCache]: Analyzing trace with hash 78462151, now seen corresponding path program 285 times [2021-05-22 02:24:37,162 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:37,162 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35404832] [2021-05-22 02:24:37,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:37,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:37,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:37,260 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:37,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35404832] [2021-05-22 02:24:37,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35404832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:37,260 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [915933781] [2021-05-22 02:24:37,260 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 286 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 286 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:37,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:37,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:37,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:37,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:37,334 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:37,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:37,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:37,345 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:37,347 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:37,347 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:24:37,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:37,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:37,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:37,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:37,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:37,496 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:37,510 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:37,512 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:37,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:37,513 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:37,527 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:37,528 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:37,528 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:5 [2021-05-22 02:24:37,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:37,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [915933781] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:37,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:37,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:37,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426442188] [2021-05-22 02:24:37,554 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:37,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:37,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:37,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:37,555 INFO L87 Difference]: Start difference. First operand 415 states and 1283 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:37,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:37,839 INFO L93 Difference]: Finished difference Result 645 states and 1933 transitions. [2021-05-22 02:24:37,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:24:37,839 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:37,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:37,840 INFO L225 Difference]: With dead ends: 645 [2021-05-22 02:24:37,840 INFO L226 Difference]: Without dead ends: 585 [2021-05-22 02:24:37,841 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 241.6ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:37,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-05-22 02:24:37,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 415. [2021-05-22 02:24:37,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.0917874396135265) internal successors, (1280), 414 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:37,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1280 transitions. [2021-05-22 02:24:37,845 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1280 transitions. Word has length 21 [2021-05-22 02:24:37,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:37,845 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1280 transitions. [2021-05-22 02:24:37,845 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:37,845 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1280 transitions. [2021-05-22 02:24:37,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:37,846 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:37,846 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:38,046 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 286 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1138 [2021-05-22 02:24:38,046 INFO L430 AbstractCegarLoop]: === Iteration 298 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:38,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:38,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1740027667, now seen corresponding path program 286 times [2021-05-22 02:24:38,047 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:38,047 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248694338] [2021-05-22 02:24:38,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:38,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:38,150 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:38,150 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:38,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248694338] [2021-05-22 02:24:38,150 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248694338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:38,150 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755224880] [2021-05-22 02:24:38,150 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 287 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 287 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:38,175 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:38,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:38,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:38,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:38,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:38,245 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:38,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:38,248 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,264 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:38,266 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:38,266 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:38,371 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_43, v_prenex_44]} [2021-05-22 02:24:38,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:38,374 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,387 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:38,387 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:38,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:38,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:38,390 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,401 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:38,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:38,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:38,403 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,413 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:38,414 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:38,414 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:51, output treesize:15 [2021-05-22 02:24:38,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:38,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755224880] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:38,440 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:38,440 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:38,440 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116457247] [2021-05-22 02:24:38,440 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:38,440 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:38,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:38,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:38,441 INFO L87 Difference]: Start difference. First operand 415 states and 1280 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:38,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:38,599 INFO L93 Difference]: Finished difference Result 541 states and 1651 transitions. [2021-05-22 02:24:38,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:38,599 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:38,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:38,600 INFO L225 Difference]: With dead ends: 541 [2021-05-22 02:24:38,600 INFO L226 Difference]: Without dead ends: 512 [2021-05-22 02:24:38,600 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 168.6ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:38,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-05-22 02:24:38,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 415. [2021-05-22 02:24:38,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.0917874396135265) internal successors, (1280), 414 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:38,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1280 transitions. [2021-05-22 02:24:38,604 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1280 transitions. Word has length 21 [2021-05-22 02:24:38,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:38,604 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1280 transitions. [2021-05-22 02:24:38,604 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:38,604 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1280 transitions. [2021-05-22 02:24:38,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:38,605 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:38,605 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:38,805 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 287 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1154 [2021-05-22 02:24:38,805 INFO L430 AbstractCegarLoop]: === Iteration 299 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:38,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:38,806 INFO L82 PathProgramCache]: Analyzing trace with hash 1460240711, now seen corresponding path program 287 times [2021-05-22 02:24:38,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:38,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1640286401] [2021-05-22 02:24:38,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:38,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:38,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:38,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:38,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1640286401] [2021-05-22 02:24:38,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1640286401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:38,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73431844] [2021-05-22 02:24:38,899 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 288 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 288 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:38,924 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:38,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:38,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:38,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:38,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:38,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:38,972 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:38,980 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:38,983 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:38,983 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:24:39,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:39,097 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,099 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:39,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:39,100 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:39,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:39,117 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,132 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:39,132 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:24:39,149 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:39,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73431844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:39,149 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:39,149 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:39,150 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1553836335] [2021-05-22 02:24:39,150 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:39,150 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:39,150 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:39,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:39,150 INFO L87 Difference]: Start difference. First operand 415 states and 1280 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:39,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:39,317 INFO L93 Difference]: Finished difference Result 498 states and 1517 transitions. [2021-05-22 02:24:39,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:39,317 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:39,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:39,318 INFO L225 Difference]: With dead ends: 498 [2021-05-22 02:24:39,318 INFO L226 Difference]: Without dead ends: 471 [2021-05-22 02:24:39,318 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 156.9ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:39,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 471 states. [2021-05-22 02:24:39,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 471 to 412. [2021-05-22 02:24:39,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 412 states, 411 states have (on average 3.0948905109489053) internal successors, (1272), 411 states have internal predecessors, (1272), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:39,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 412 states to 412 states and 1272 transitions. [2021-05-22 02:24:39,323 INFO L78 Accepts]: Start accepts. Automaton has 412 states and 1272 transitions. Word has length 21 [2021-05-22 02:24:39,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:39,323 INFO L482 AbstractCegarLoop]: Abstraction has 412 states and 1272 transitions. [2021-05-22 02:24:39,323 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:39,323 INFO L276 IsEmpty]: Start isEmpty. Operand 412 states and 1272 transitions. [2021-05-22 02:24:39,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:39,323 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:39,323 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:39,524 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1173,288 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:39,524 INFO L430 AbstractCegarLoop]: === Iteration 300 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:39,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:39,524 INFO L82 PathProgramCache]: Analyzing trace with hash 835954947, now seen corresponding path program 288 times [2021-05-22 02:24:39,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:39,524 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142470368] [2021-05-22 02:24:39,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:39,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:39,618 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:39,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:39,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142470368] [2021-05-22 02:24:39,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142470368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:39,618 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833731064] [2021-05-22 02:24:39,618 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 289 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 289 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:39,643 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:39,643 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:39,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:39,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:39,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:39,713 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,714 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:39,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:39,715 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,734 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:39,734 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:24:39,775 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_46, v_prenex_45]} [2021-05-22 02:24:39,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:39,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,793 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,793 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:24:39,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:39,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:39,796 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,809 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,811 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:39,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:39,817 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:39,830 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:39,831 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:39,831 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:59, output treesize:24 [2021-05-22 02:24:39,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:39,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833731064] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:39,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:39,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:39,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515039108] [2021-05-22 02:24:39,864 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:39,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:39,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:39,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:39,864 INFO L87 Difference]: Start difference. First operand 412 states and 1272 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:40,007 INFO L93 Difference]: Finished difference Result 544 states and 1659 transitions. [2021-05-22 02:24:40,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:40,013 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:40,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:40,014 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:24:40,014 INFO L226 Difference]: Without dead ends: 515 [2021-05-22 02:24:40,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 149.1ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:40,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-05-22 02:24:40,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 413. [2021-05-22 02:24:40,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 412 states have (on average 3.1019417475728157) internal successors, (1278), 412 states have internal predecessors, (1278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 1278 transitions. [2021-05-22 02:24:40,020 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 1278 transitions. Word has length 21 [2021-05-22 02:24:40,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:40,020 INFO L482 AbstractCegarLoop]: Abstraction has 413 states and 1278 transitions. [2021-05-22 02:24:40,020 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,021 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 1278 transitions. [2021-05-22 02:24:40,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:40,021 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:40,021 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:40,242 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1186,289 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:40,243 INFO L430 AbstractCegarLoop]: === Iteration 301 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:40,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:40,243 INFO L82 PathProgramCache]: Analyzing trace with hash 848958673, now seen corresponding path program 289 times [2021-05-22 02:24:40,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:40,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308604498] [2021-05-22 02:24:40,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:40,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:40,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:40,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:40,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308604498] [2021-05-22 02:24:40,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1308604498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:40,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1797434515] [2021-05-22 02:24:40,350 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 290 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 290 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:40,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:40,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:40,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:40,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:40,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:40,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:40,429 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:40,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:40,432 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:24:40,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:40,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:40,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:40,475 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:40,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:40,478 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:40,496 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:40,499 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:40,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:40,499 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:40,539 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:40,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:40,541 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:24:40,617 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:40,618 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1797434515] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:40,618 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:40,618 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:40,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2910633] [2021-05-22 02:24:40,618 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:40,618 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:40,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:40,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:40,618 INFO L87 Difference]: Start difference. First operand 413 states and 1278 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:40,938 INFO L93 Difference]: Finished difference Result 565 states and 1709 transitions. [2021-05-22 02:24:40,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:40,939 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:40,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:40,940 INFO L225 Difference]: With dead ends: 565 [2021-05-22 02:24:40,940 INFO L226 Difference]: Without dead ends: 538 [2021-05-22 02:24:40,940 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 300.5ms TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:24:40,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-22 02:24:40,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 411. [2021-05-22 02:24:40,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 411 states, 410 states have (on average 3.0902439024390245) internal successors, (1267), 410 states have internal predecessors, (1267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 411 states to 411 states and 1267 transitions. [2021-05-22 02:24:40,944 INFO L78 Accepts]: Start accepts. Automaton has 411 states and 1267 transitions. Word has length 21 [2021-05-22 02:24:40,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:40,945 INFO L482 AbstractCegarLoop]: Abstraction has 411 states and 1267 transitions. [2021-05-22 02:24:40,945 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:40,945 INFO L276 IsEmpty]: Start isEmpty. Operand 411 states and 1267 transitions. [2021-05-22 02:24:40,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:40,945 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:40,945 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:41,145 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 290 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1194 [2021-05-22 02:24:41,146 INFO L430 AbstractCegarLoop]: === Iteration 302 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:41,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:41,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1990525963, now seen corresponding path program 290 times [2021-05-22 02:24:41,146 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:41,146 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325802220] [2021-05-22 02:24:41,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:41,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:41,248 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:41,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:41,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325802220] [2021-05-22 02:24:41,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325802220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:41,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538283525] [2021-05-22 02:24:41,249 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 291 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 291 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:41,274 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:41,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:41,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:41,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:41,371 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:41,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:41,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:41,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:41,379 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:41,379 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:22 [2021-05-22 02:24:41,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:41,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:41,405 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:41,412 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:41,413 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:41,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:41,414 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:41,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:41,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:41,421 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:24:41,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:41,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538283525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:41,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:41,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:41,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275831550] [2021-05-22 02:24:41,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:41,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:41,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:41,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:41,433 INFO L87 Difference]: Start difference. First operand 411 states and 1267 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:41,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:41,580 INFO L93 Difference]: Finished difference Result 483 states and 1473 transitions. [2021-05-22 02:24:41,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:41,580 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:41,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:41,581 INFO L225 Difference]: With dead ends: 483 [2021-05-22 02:24:41,581 INFO L226 Difference]: Without dead ends: 464 [2021-05-22 02:24:41,581 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 161.5ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:41,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 464 states. [2021-05-22 02:24:41,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 464 to 407. [2021-05-22 02:24:41,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 3.0911330049261085) internal successors, (1255), 406 states have internal predecessors, (1255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:41,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 1255 transitions. [2021-05-22 02:24:41,585 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 1255 transitions. Word has length 21 [2021-05-22 02:24:41,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:41,585 INFO L482 AbstractCegarLoop]: Abstraction has 407 states and 1255 transitions. [2021-05-22 02:24:41,585 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:41,585 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 1255 transitions. [2021-05-22 02:24:41,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:41,586 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:41,586 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:41,786 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1204,291 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:41,786 INFO L430 AbstractCegarLoop]: === Iteration 303 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:41,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:41,786 INFO L82 PathProgramCache]: Analyzing trace with hash 246230357, now seen corresponding path program 291 times [2021-05-22 02:24:41,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:41,786 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767645733] [2021-05-22 02:24:41,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:41,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:41,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:41,879 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:41,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767645733] [2021-05-22 02:24:41,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767645733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:41,879 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308616543] [2021-05-22 02:24:41,879 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 292 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 292 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:41,904 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:41,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:41,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:41,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:41,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:41,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:41,982 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:41,988 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:41,989 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:41,989 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:24:42,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:24:42,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:24:42,036 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:42,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:42,052 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:42,067 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:42,067 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:15 [2021-05-22 02:24:42,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:42,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308616543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:42,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:42,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:42,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688061308] [2021-05-22 02:24:42,092 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:42,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:42,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:42,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:42,092 INFO L87 Difference]: Start difference. First operand 407 states and 1255 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:42,228 INFO L93 Difference]: Finished difference Result 504 states and 1535 transitions. [2021-05-22 02:24:42,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:42,229 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:42,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:42,229 INFO L225 Difference]: With dead ends: 504 [2021-05-22 02:24:42,230 INFO L226 Difference]: Without dead ends: 468 [2021-05-22 02:24:42,230 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 141.8ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:42,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 468 states. [2021-05-22 02:24:42,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 468 to 407. [2021-05-22 02:24:42,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 3.0911330049261085) internal successors, (1255), 406 states have internal predecessors, (1255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 1255 transitions. [2021-05-22 02:24:42,234 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 1255 transitions. Word has length 21 [2021-05-22 02:24:42,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:42,234 INFO L482 AbstractCegarLoop]: Abstraction has 407 states and 1255 transitions. [2021-05-22 02:24:42,234 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,234 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 1255 transitions. [2021-05-22 02:24:42,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:42,235 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:42,235 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:42,435 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 292 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1207 [2021-05-22 02:24:42,435 INFO L430 AbstractCegarLoop]: === Iteration 304 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:42,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:42,435 INFO L82 PathProgramCache]: Analyzing trace with hash -848468561, now seen corresponding path program 292 times [2021-05-22 02:24:42,435 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:42,435 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556688267] [2021-05-22 02:24:42,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:42,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:42,532 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:42,533 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:42,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556688267] [2021-05-22 02:24:42,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556688267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:42,533 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [15047211] [2021-05-22 02:24:42,533 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 293 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 293 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:42,557 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:42,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:42,558 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:42,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:42,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:42,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:42,650 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,668 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:42,669 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:42,669 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:28 [2021-05-22 02:24:42,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:42,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,709 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:42,710 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,722 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:42,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:42,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:42,725 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:42,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:42,737 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:42,737 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:56, output treesize:13 [2021-05-22 02:24:42,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:42,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [15047211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:42,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:42,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:42,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978376913] [2021-05-22 02:24:42,767 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:42,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:42,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:42,768 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:42,768 INFO L87 Difference]: Start difference. First operand 407 states and 1255 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:42,945 INFO L93 Difference]: Finished difference Result 545 states and 1654 transitions. [2021-05-22 02:24:42,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:42,945 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:42,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:42,946 INFO L225 Difference]: With dead ends: 545 [2021-05-22 02:24:42,946 INFO L226 Difference]: Without dead ends: 518 [2021-05-22 02:24:42,946 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 185.6ms TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:42,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-22 02:24:42,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 422. [2021-05-22 02:24:42,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 421 states have (on average 3.0902612826603324) internal successors, (1301), 421 states have internal predecessors, (1301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 1301 transitions. [2021-05-22 02:24:42,951 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 1301 transitions. Word has length 21 [2021-05-22 02:24:42,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:42,951 INFO L482 AbstractCegarLoop]: Abstraction has 422 states and 1301 transitions. [2021-05-22 02:24:42,951 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:42,951 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 1301 transitions. [2021-05-22 02:24:42,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:42,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:42,951 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:43,152 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1217,293 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:43,152 INFO L430 AbstractCegarLoop]: === Iteration 305 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:43,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:43,152 INFO L82 PathProgramCache]: Analyzing trace with hash 1032284377, now seen corresponding path program 293 times [2021-05-22 02:24:43,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:43,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577622416] [2021-05-22 02:24:43,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:43,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:43,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:43,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:43,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577622416] [2021-05-22 02:24:43,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577622416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:43,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129554523] [2021-05-22 02:24:43,255 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 294 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 294 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:43,280 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:43,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:43,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:43,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:43,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:43,370 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:43,374 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,389 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:43,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:43,391 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:28 [2021-05-22 02:24:43,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:43,454 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,457 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:43,458 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:43,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,489 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:43,490 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:43,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:43,493 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:43,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:43,519 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:43,519 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:77, output treesize:25 [2021-05-22 02:24:43,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:43,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129554523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:43,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:43,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:43,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [189324183] [2021-05-22 02:24:43,581 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:43,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:43,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:43,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:43,581 INFO L87 Difference]: Start difference. First operand 422 states and 1301 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:43,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:43,784 INFO L93 Difference]: Finished difference Result 495 states and 1501 transitions. [2021-05-22 02:24:43,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:43,784 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:43,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:43,785 INFO L225 Difference]: With dead ends: 495 [2021-05-22 02:24:43,785 INFO L226 Difference]: Without dead ends: 474 [2021-05-22 02:24:43,785 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 250.5ms TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:24:43,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 474 states. [2021-05-22 02:24:43,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 474 to 404. [2021-05-22 02:24:43,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 404 states, 403 states have (on average 3.094292803970223) internal successors, (1247), 403 states have internal predecessors, (1247), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:43,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 404 states to 404 states and 1247 transitions. [2021-05-22 02:24:43,790 INFO L78 Accepts]: Start accepts. Automaton has 404 states and 1247 transitions. Word has length 21 [2021-05-22 02:24:43,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:43,790 INFO L482 AbstractCegarLoop]: Abstraction has 404 states and 1247 transitions. [2021-05-22 02:24:43,790 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:43,790 INFO L276 IsEmpty]: Start isEmpty. Operand 404 states and 1247 transitions. [2021-05-22 02:24:43,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:43,790 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:43,790 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:43,990 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 294 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1231 [2021-05-22 02:24:43,991 INFO L430 AbstractCegarLoop]: === Iteration 306 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:43,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:43,991 INFO L82 PathProgramCache]: Analyzing trace with hash 1684577419, now seen corresponding path program 294 times [2021-05-22 02:24:43,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:43,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187895714] [2021-05-22 02:24:43,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:43,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:44,069 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:44,069 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:44,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187895714] [2021-05-22 02:24:44,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187895714] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:44,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314784555] [2021-05-22 02:24:44,070 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 295 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 295 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:44,094 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:44,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:44,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:44,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:44,157 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:44,171 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,179 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,180 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:44,180 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:33 [2021-05-22 02:24:44,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:24:44,227 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:24:44,230 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:44,249 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,266 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:44,266 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:24 [2021-05-22 02:24:44,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:44,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314784555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:44,299 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:44,299 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:44,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470350737] [2021-05-22 02:24:44,299 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:44,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:44,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:44,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:44,300 INFO L87 Difference]: Start difference. First operand 404 states and 1247 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:44,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:44,459 INFO L93 Difference]: Finished difference Result 519 states and 1575 transitions. [2021-05-22 02:24:44,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:44,459 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:44,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:44,460 INFO L225 Difference]: With dead ends: 519 [2021-05-22 02:24:44,460 INFO L226 Difference]: Without dead ends: 483 [2021-05-22 02:24:44,460 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 134.6ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:44,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-22 02:24:44,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 405. [2021-05-22 02:24:44,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 3.099009900990099) internal successors, (1252), 404 states have internal predecessors, (1252), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:44,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 1252 transitions. [2021-05-22 02:24:44,464 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 1252 transitions. Word has length 21 [2021-05-22 02:24:44,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:44,465 INFO L482 AbstractCegarLoop]: Abstraction has 405 states and 1252 transitions. [2021-05-22 02:24:44,465 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:44,465 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 1252 transitions. [2021-05-22 02:24:44,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:44,465 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:44,465 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:44,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1241,295 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:44,665 INFO L430 AbstractCegarLoop]: === Iteration 307 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:44,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:44,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1981843829, now seen corresponding path program 295 times [2021-05-22 02:24:44,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:44,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [980919632] [2021-05-22 02:24:44,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:44,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:44,752 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:44,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [980919632] [2021-05-22 02:24:44,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [980919632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:44,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [130294777] [2021-05-22 02:24:44,752 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 296 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 296 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:44,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:44,778 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:44,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:44,845 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_47], 1=[o_2]} [2021-05-22 02:24:44,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:44,848 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,862 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,864 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:44,865 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,876 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,878 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:44,878 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:24:44,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:44,920 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,921 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:44,922 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,937 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,940 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:44,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:44,940 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:44,955 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:44,956 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:44,956 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:62, output treesize:19 [2021-05-22 02:24:44,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:44,978 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [130294777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:44,978 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:44,978 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:24:44,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175185196] [2021-05-22 02:24:44,979 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:24:44,979 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:44,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:24:44,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:24:44,979 INFO L87 Difference]: Start difference. First operand 405 states and 1252 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:45,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:45,149 INFO L93 Difference]: Finished difference Result 604 states and 1827 transitions. [2021-05-22 02:24:45,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:45,149 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:45,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:45,150 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:24:45,150 INFO L226 Difference]: Without dead ends: 581 [2021-05-22 02:24:45,150 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 151.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:45,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-22 02:24:45,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 420. [2021-05-22 02:24:45,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 419 states have (on average 3.119331742243437) internal successors, (1307), 419 states have internal predecessors, (1307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:45,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 1307 transitions. [2021-05-22 02:24:45,155 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 1307 transitions. Word has length 21 [2021-05-22 02:24:45,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:45,155 INFO L482 AbstractCegarLoop]: Abstraction has 420 states and 1307 transitions. [2021-05-22 02:24:45,155 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:45,155 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 1307 transitions. [2021-05-22 02:24:45,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:45,155 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:45,155 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:45,356 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 296 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1247 [2021-05-22 02:24:45,356 INFO L430 AbstractCegarLoop]: === Iteration 308 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:45,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:45,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1697581145, now seen corresponding path program 296 times [2021-05-22 02:24:45,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:45,356 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287017999] [2021-05-22 02:24:45,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:45,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:45,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:45,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:45,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287017999] [2021-05-22 02:24:45,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287017999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:45,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109010142] [2021-05-22 02:24:45,472 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 297 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 297 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:45,497 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:45,497 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:45,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:45,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:45,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:45,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:45,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:45,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:45,556 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:45,576 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:45,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:45,577 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:24:45,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:45,622 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:45,624 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:45,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:45,625 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:45,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:45,641 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:45,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:45,642 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:45,656 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:45,657 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:45,657 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:66, output treesize:19 [2021-05-22 02:24:45,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:45,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109010142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:45,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:45,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:45,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209278578] [2021-05-22 02:24:45,731 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:45,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:45,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:45,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:45,732 INFO L87 Difference]: Start difference. First operand 420 states and 1307 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:46,044 INFO L93 Difference]: Finished difference Result 637 states and 1918 transitions. [2021-05-22 02:24:46,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:46,044 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:46,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:46,045 INFO L225 Difference]: With dead ends: 637 [2021-05-22 02:24:46,045 INFO L226 Difference]: Without dead ends: 610 [2021-05-22 02:24:46,045 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 307.7ms TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:24:46,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-22 02:24:46,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 438. [2021-05-22 02:24:46,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.128146453089245) internal successors, (1367), 437 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1367 transitions. [2021-05-22 02:24:46,050 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1367 transitions. Word has length 21 [2021-05-22 02:24:46,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:46,050 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1367 transitions. [2021-05-22 02:24:46,050 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,050 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1367 transitions. [2021-05-22 02:24:46,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:46,051 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:46,051 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:46,251 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 297 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1255 [2021-05-22 02:24:46,251 INFO L430 AbstractCegarLoop]: === Iteration 309 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:46,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:46,251 INFO L82 PathProgramCache]: Analyzing trace with hash -263165821, now seen corresponding path program 297 times [2021-05-22 02:24:46,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:46,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [670232414] [2021-05-22 02:24:46,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:46,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:46,360 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:46,360 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:46,360 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [670232414] [2021-05-22 02:24:46,360 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [670232414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:46,361 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620910505] [2021-05-22 02:24:46,361 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 298 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 298 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:46,402 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:46,403 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:46,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:46,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:46,469 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_48]} [2021-05-22 02:24:46,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:46,473 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:46,486 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:46,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:46,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:46,489 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:46,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:46,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:46,502 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:24:46,553 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:46,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:46,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:46,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:46,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:46,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:46,563 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:46,570 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:46,570 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:46,570 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:24:46,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:46,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620910505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:46,635 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:46,635 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:46,635 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1118197460] [2021-05-22 02:24:46,636 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:46,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:46,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:46,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:46,636 INFO L87 Difference]: Start difference. First operand 438 states and 1367 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:46,907 INFO L93 Difference]: Finished difference Result 609 states and 1851 transitions. [2021-05-22 02:24:46,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:46,908 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:46,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:46,908 INFO L225 Difference]: With dead ends: 609 [2021-05-22 02:24:46,908 INFO L226 Difference]: Without dead ends: 590 [2021-05-22 02:24:46,909 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 247.4ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:46,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-22 02:24:46,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 424. [2021-05-22 02:24:46,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 423 states have (on average 3.115839243498818) internal successors, (1318), 423 states have internal predecessors, (1318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 1318 transitions. [2021-05-22 02:24:46,913 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 1318 transitions. Word has length 21 [2021-05-22 02:24:46,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:46,913 INFO L482 AbstractCegarLoop]: Abstraction has 424 states and 1318 transitions. [2021-05-22 02:24:46,913 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:46,918 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 1318 transitions. [2021-05-22 02:24:46,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:46,918 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:46,918 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:47,119 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 298 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1267 [2021-05-22 02:24:47,119 INFO L430 AbstractCegarLoop]: === Iteration 310 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:47,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:47,119 INFO L82 PathProgramCache]: Analyzing trace with hash 282206833, now seen corresponding path program 298 times [2021-05-22 02:24:47,119 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:47,119 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2037552440] [2021-05-22 02:24:47,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:47,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:47,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:47,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:47,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2037552440] [2021-05-22 02:24:47,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2037552440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:47,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1960136569] [2021-05-22 02:24:47,215 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 299 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 299 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:47,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:47,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:47,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:47,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:47,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:47,295 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:47,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:47,296 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:47,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:47,299 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:47,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:47,314 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:47,314 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:24:47,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:47,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:47,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:47,427 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:47,428 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:47,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:47,429 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:47,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:47,435 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:47,435 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:7 [2021-05-22 02:24:47,444 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:47,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1960136569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:47,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:47,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:47,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230473675] [2021-05-22 02:24:47,445 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:47,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:47,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:47,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:47,445 INFO L87 Difference]: Start difference. First operand 424 states and 1318 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:47,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:47,631 INFO L93 Difference]: Finished difference Result 526 states and 1590 transitions. [2021-05-22 02:24:47,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:47,632 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:47,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:47,632 INFO L225 Difference]: With dead ends: 526 [2021-05-22 02:24:47,633 INFO L226 Difference]: Without dead ends: 505 [2021-05-22 02:24:47,633 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 189.8ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:47,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2021-05-22 02:24:47,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 420. [2021-05-22 02:24:47,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 420 states, 419 states have (on average 3.116945107398568) internal successors, (1306), 419 states have internal predecessors, (1306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:47,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 420 states to 420 states and 1306 transitions. [2021-05-22 02:24:47,637 INFO L78 Accepts]: Start accepts. Automaton has 420 states and 1306 transitions. Word has length 21 [2021-05-22 02:24:47,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:47,637 INFO L482 AbstractCegarLoop]: Abstraction has 420 states and 1306 transitions. [2021-05-22 02:24:47,637 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:47,637 INFO L276 IsEmpty]: Start isEmpty. Operand 420 states and 1306 transitions. [2021-05-22 02:24:47,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:47,637 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:47,638 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:47,838 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1272,299 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:47,838 INFO L430 AbstractCegarLoop]: === Iteration 311 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:47,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:47,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1436777849, now seen corresponding path program 299 times [2021-05-22 02:24:47,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:47,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868517994] [2021-05-22 02:24:47,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:47,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:47,970 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:47,970 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:47,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868517994] [2021-05-22 02:24:47,970 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868517994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:47,970 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557815138] [2021-05-22 02:24:47,970 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 300 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 300 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:47,995 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:47,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:47,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:47,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:48,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:48,050 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:48,053 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,067 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:48,068 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:48,068 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:24:48,125 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,125 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:48,126 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:48,129 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,155 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:48,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:48,160 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:48,163 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,187 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:48,188 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:48,188 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:87, output treesize:31 [2021-05-22 02:24:48,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:48,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557815138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:48,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:48,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:48,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132503178] [2021-05-22 02:24:48,263 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:48,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:48,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:48,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:48,264 INFO L87 Difference]: Start difference. First operand 420 states and 1306 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:48,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:48,624 INFO L93 Difference]: Finished difference Result 559 states and 1704 transitions. [2021-05-22 02:24:48,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:48,624 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:48,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:48,625 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:24:48,625 INFO L226 Difference]: Without dead ends: 538 [2021-05-22 02:24:48,625 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 315.6ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:24:48,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-22 02:24:48,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 403. [2021-05-22 02:24:48,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 3.0920398009950247) internal successors, (1243), 402 states have internal predecessors, (1243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:48,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 1243 transitions. [2021-05-22 02:24:48,629 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 1243 transitions. Word has length 21 [2021-05-22 02:24:48,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:48,629 INFO L482 AbstractCegarLoop]: Abstraction has 403 states and 1243 transitions. [2021-05-22 02:24:48,629 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:48,629 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 1243 transitions. [2021-05-22 02:24:48,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:48,630 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:48,630 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:48,830 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 300 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1287 [2021-05-22 02:24:48,830 INFO L430 AbstractCegarLoop]: === Iteration 312 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:48,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:48,831 INFO L82 PathProgramCache]: Analyzing trace with hash 1694849269, now seen corresponding path program 300 times [2021-05-22 02:24:48,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:48,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448544676] [2021-05-22 02:24:48,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:48,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:48,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:48,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:48,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448544676] [2021-05-22 02:24:48,910 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448544676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:48,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1164511570] [2021-05-22 02:24:48,911 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 301 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 301 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:48,936 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:48,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:48,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:48,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:48,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:48,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:48,997 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:48,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:49,000 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,013 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,014 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:49,014 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:24:49,073 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:49,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:49,074 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,083 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:49,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:49,085 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,092 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,093 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,093 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:12 [2021-05-22 02:24:49,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:49,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1164511570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:49,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:49,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:49,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757986645] [2021-05-22 02:24:49,106 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:49,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:49,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:49,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:49,107 INFO L87 Difference]: Start difference. First operand 403 states and 1243 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:49,227 INFO L93 Difference]: Finished difference Result 483 states and 1474 transitions. [2021-05-22 02:24:49,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:49,228 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:49,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:49,228 INFO L225 Difference]: With dead ends: 483 [2021-05-22 02:24:49,228 INFO L226 Difference]: Without dead ends: 461 [2021-05-22 02:24:49,228 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 136.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:49,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-05-22 02:24:49,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 409. [2021-05-22 02:24:49,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 3.0980392156862746) internal successors, (1264), 408 states have internal predecessors, (1264), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 1264 transitions. [2021-05-22 02:24:49,232 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 1264 transitions. Word has length 21 [2021-05-22 02:24:49,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:49,233 INFO L482 AbstractCegarLoop]: Abstraction has 409 states and 1264 transitions. [2021-05-22 02:24:49,233 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,233 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 1264 transitions. [2021-05-22 02:24:49,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:49,233 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:49,233 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:49,433 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1294,301 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:49,433 INFO L430 AbstractCegarLoop]: === Iteration 313 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:49,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:49,434 INFO L82 PathProgramCache]: Analyzing trace with hash -1974793909, now seen corresponding path program 301 times [2021-05-22 02:24:49,434 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:49,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403315744] [2021-05-22 02:24:49,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:49,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:49,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:49,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:49,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403315744] [2021-05-22 02:24:49,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403315744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:49,528 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525000845] [2021-05-22 02:24:49,528 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 302 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 302 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:49,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:49,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:49,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:49,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:49,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:49,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,606 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,607 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:49,607 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:24:49,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:49,685 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,686 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:49,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:49,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,701 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:49,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:49,703 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:49,715 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:49,717 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:49,717 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:13 [2021-05-22 02:24:49,760 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:49,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525000845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:49,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:49,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:49,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853973666] [2021-05-22 02:24:49,760 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:49,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:49,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:49,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:49,761 INFO L87 Difference]: Start difference. First operand 409 states and 1264 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:49,922 INFO L93 Difference]: Finished difference Result 553 states and 1681 transitions. [2021-05-22 02:24:49,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:49,922 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:49,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:49,923 INFO L225 Difference]: With dead ends: 553 [2021-05-22 02:24:49,923 INFO L226 Difference]: Without dead ends: 526 [2021-05-22 02:24:49,923 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 189.2ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:24:49,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-05-22 02:24:49,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 409. [2021-05-22 02:24:49,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 3.093137254901961) internal successors, (1262), 408 states have internal predecessors, (1262), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 1262 transitions. [2021-05-22 02:24:49,928 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 1262 transitions. Word has length 21 [2021-05-22 02:24:49,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:49,928 INFO L482 AbstractCegarLoop]: Abstraction has 409 states and 1262 transitions. [2021-05-22 02:24:49,928 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:49,928 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 1262 transitions. [2021-05-22 02:24:49,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:49,928 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:49,928 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:50,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 302 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1301 [2021-05-22 02:24:50,129 INFO L430 AbstractCegarLoop]: === Iteration 314 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:50,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:50,129 INFO L82 PathProgramCache]: Analyzing trace with hash 2035910703, now seen corresponding path program 302 times [2021-05-22 02:24:50,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:50,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418551514] [2021-05-22 02:24:50,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:50,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:50,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:50,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:50,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418551514] [2021-05-22 02:24:50,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418551514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:50,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162131569] [2021-05-22 02:24:50,222 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 303 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 303 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:50,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:50,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:50,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:50,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:50,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:50,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:50,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:50,298 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:50,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:50,301 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:50,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:50,319 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:50,319 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:50,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:50,407 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:50,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:50,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:50,410 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:50,424 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:50,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:50,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:50,426 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:50,439 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:50,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:50,440 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:24:50,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:50,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162131569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:50,489 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:50,489 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:50,489 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691880143] [2021-05-22 02:24:50,489 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:50,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:50,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:50,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:50,489 INFO L87 Difference]: Start difference. First operand 409 states and 1262 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:50,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:50,828 INFO L93 Difference]: Finished difference Result 643 states and 1940 transitions. [2021-05-22 02:24:50,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:50,828 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:50,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:50,829 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:24:50,829 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:24:50,829 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 292.2ms TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:24:50,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:24:50,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 423. [2021-05-22 02:24:50,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 3.0924170616113744) internal successors, (1305), 422 states have internal predecessors, (1305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:50,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 1305 transitions. [2021-05-22 02:24:50,834 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 1305 transitions. Word has length 21 [2021-05-22 02:24:50,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:50,834 INFO L482 AbstractCegarLoop]: Abstraction has 423 states and 1305 transitions. [2021-05-22 02:24:50,834 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:50,834 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 1305 transitions. [2021-05-22 02:24:50,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:50,834 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:50,834 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:51,034 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 303 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1311 [2021-05-22 02:24:51,035 INFO L430 AbstractCegarLoop]: === Iteration 315 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:51,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:51,035 INFO L82 PathProgramCache]: Analyzing trace with hash -572664753, now seen corresponding path program 303 times [2021-05-22 02:24:51,035 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:51,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152662487] [2021-05-22 02:24:51,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:51,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:51,127 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:51,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:51,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [152662487] [2021-05-22 02:24:51,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [152662487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:51,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059337716] [2021-05-22 02:24:51,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 304 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 304 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:51,152 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:24:51,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:51,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:51,153 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:51,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:51,210 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:51,212 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:51,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:51,213 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:51,230 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:51,231 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:51,231 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:51,334 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:51,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:51,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:51,342 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:51,343 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:51,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:51,344 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:51,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:51,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:51,351 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:24:51,380 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:51,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059337716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:51,380 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:51,380 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:51,380 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872450075] [2021-05-22 02:24:51,380 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:51,380 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:51,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:51,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:51,380 INFO L87 Difference]: Start difference. First operand 423 states and 1305 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:51,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:51,679 INFO L93 Difference]: Finished difference Result 577 states and 1741 transitions. [2021-05-22 02:24:51,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:24:51,679 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:51,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:51,680 INFO L225 Difference]: With dead ends: 577 [2021-05-22 02:24:51,680 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:24:51,680 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 305.2ms TimeCoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:51,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:24:51,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 424. [2021-05-22 02:24:51,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 423 states have (on average 3.1016548463356974) internal successors, (1312), 423 states have internal predecessors, (1312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:51,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 1312 transitions. [2021-05-22 02:24:51,685 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 1312 transitions. Word has length 21 [2021-05-22 02:24:51,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:51,685 INFO L482 AbstractCegarLoop]: Abstraction has 424 states and 1312 transitions. [2021-05-22 02:24:51,685 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:51,685 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 1312 transitions. [2021-05-22 02:24:51,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:51,685 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:51,685 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:51,885 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 304 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1328 [2021-05-22 02:24:51,886 INFO L430 AbstractCegarLoop]: === Iteration 316 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:51,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:51,886 INFO L82 PathProgramCache]: Analyzing trace with hash -550160381, now seen corresponding path program 304 times [2021-05-22 02:24:51,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:51,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073447667] [2021-05-22 02:24:51,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:51,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:51,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:51,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:51,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073447667] [2021-05-22 02:24:51,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073447667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:51,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1692007896] [2021-05-22 02:24:51,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 305 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 305 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:51,993 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:51,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:51,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:51,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:52,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:52,057 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:52,060 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,073 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,074 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:52,074 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:24:52,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:52,118 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,120 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:52,121 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,138 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:52,141 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,158 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:52,158 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:24:52,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:52,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1692007896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:52,192 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:52,192 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:52,192 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382149224] [2021-05-22 02:24:52,192 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:52,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:52,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:52,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:52,192 INFO L87 Difference]: Start difference. First operand 424 states and 1312 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:52,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:52,329 INFO L93 Difference]: Finished difference Result 545 states and 1669 transitions. [2021-05-22 02:24:52,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:52,330 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:52,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:52,330 INFO L225 Difference]: With dead ends: 545 [2021-05-22 02:24:52,330 INFO L226 Difference]: Without dead ends: 516 [2021-05-22 02:24:52,331 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 138.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:52,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2021-05-22 02:24:52,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 424. [2021-05-22 02:24:52,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 423 states have (on average 3.1016548463356974) internal successors, (1312), 423 states have internal predecessors, (1312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:52,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 1312 transitions. [2021-05-22 02:24:52,335 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 1312 transitions. Word has length 21 [2021-05-22 02:24:52,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:52,335 INFO L482 AbstractCegarLoop]: Abstraction has 424 states and 1312 transitions. [2021-05-22 02:24:52,335 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:52,335 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 1312 transitions. [2021-05-22 02:24:52,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:52,335 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:52,335 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:52,536 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1340,305 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:52,536 INFO L430 AbstractCegarLoop]: === Iteration 317 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:52,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:52,536 INFO L82 PathProgramCache]: Analyzing trace with hash -252893971, now seen corresponding path program 305 times [2021-05-22 02:24:52,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:52,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389336131] [2021-05-22 02:24:52,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:52,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:52,655 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:52,655 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:52,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389336131] [2021-05-22 02:24:52,655 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389336131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:52,655 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1237946402] [2021-05-22 02:24:52,655 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 306 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 306 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:52,680 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:24:52,680 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:52,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:52,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:52,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,726 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:52,727 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,729 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:52,730 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,758 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,759 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:52,759 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:75 [2021-05-22 02:24:52,848 INFO L446 ElimStorePlain]: Different costs {1=[o_2], 3=[o_0]} [2021-05-22 02:24:52,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:52,852 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:24:52,855 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,858 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,858 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:52,859 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:52,862 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:52,912 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,914 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:52,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:52,915 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:52,959 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:52,960 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:24:52,961 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:153, output treesize:57 [2021-05-22 02:24:53,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:53,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1237946402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:53,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:53,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:53,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [915796869] [2021-05-22 02:24:53,071 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:53,071 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:53,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:53,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:53,071 INFO L87 Difference]: Start difference. First operand 424 states and 1312 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:53,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:53,548 INFO L93 Difference]: Finished difference Result 613 states and 1863 transitions. [2021-05-22 02:24:53,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:24:53,548 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:53,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:53,549 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:24:53,549 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:24:53,549 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 482.8ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:24:53,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:24:53,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 423. [2021-05-22 02:24:53,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 3.1113744075829386) internal successors, (1313), 422 states have internal predecessors, (1313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:53,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 1313 transitions. [2021-05-22 02:24:53,553 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 1313 transitions. Word has length 21 [2021-05-22 02:24:53,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:53,553 INFO L482 AbstractCegarLoop]: Abstraction has 423 states and 1313 transitions. [2021-05-22 02:24:53,554 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:53,554 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 1313 transitions. [2021-05-22 02:24:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:53,554 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:53,554 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:53,754 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1349,306 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:53,755 INFO L430 AbstractCegarLoop]: === Iteration 318 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:53,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:53,755 INFO L82 PathProgramCache]: Analyzing trace with hash -537156655, now seen corresponding path program 306 times [2021-05-22 02:24:53,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:53,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698217470] [2021-05-22 02:24:53,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:53,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:53,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:53,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:53,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698217470] [2021-05-22 02:24:53,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698217470] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:53,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965790051] [2021-05-22 02:24:53,857 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 307 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 307 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:53,883 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:53,883 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:53,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:53,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:53,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:53,936 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:53,938 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:53,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:53,938 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:53,956 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:53,957 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:53,957 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:54,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:54,004 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,006 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:54,007 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,023 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:54,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:54,026 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,041 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:54,042 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:54,042 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:24:54,115 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:54,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965790051] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:54,115 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:54,115 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:54,115 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571169081] [2021-05-22 02:24:54,115 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:54,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:54,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:54,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:54,116 INFO L87 Difference]: Start difference. First operand 423 states and 1313 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:54,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:54,409 INFO L93 Difference]: Finished difference Result 667 states and 2002 transitions. [2021-05-22 02:24:54,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:24:54,409 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:54,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:54,410 INFO L225 Difference]: With dead ends: 667 [2021-05-22 02:24:54,410 INFO L226 Difference]: Without dead ends: 640 [2021-05-22 02:24:54,410 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 301.8ms TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:24:54,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-05-22 02:24:54,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 426. [2021-05-22 02:24:54,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 3.1223529411764708) internal successors, (1327), 425 states have internal predecessors, (1327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:54,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 1327 transitions. [2021-05-22 02:24:54,415 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 1327 transitions. Word has length 21 [2021-05-22 02:24:54,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:54,415 INFO L482 AbstractCegarLoop]: Abstraction has 426 states and 1327 transitions. [2021-05-22 02:24:54,415 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:54,415 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 1327 transitions. [2021-05-22 02:24:54,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:54,416 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:54,416 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:54,616 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1361,307 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:54,616 INFO L430 AbstractCegarLoop]: === Iteration 319 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:54,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:54,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1538533135, now seen corresponding path program 307 times [2021-05-22 02:24:54,617 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:54,617 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [446443888] [2021-05-22 02:24:54,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:54,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:54,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:54,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:54,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [446443888] [2021-05-22 02:24:54,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [446443888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:54,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [627737930] [2021-05-22 02:24:54,716 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 308 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 308 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:54,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:54,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:54,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:54,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:54,794 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:54,797 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,814 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:54,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:54,816 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:54,876 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:54,877 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:54,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:54,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:54,888 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:54,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:54,896 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:24:54,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:54,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [627737930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:54,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:54,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:54,911 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741731996] [2021-05-22 02:24:54,911 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:54,911 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:54,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:54,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:54,911 INFO L87 Difference]: Start difference. First operand 426 states and 1327 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:55,048 INFO L93 Difference]: Finished difference Result 522 states and 1590 transitions. [2021-05-22 02:24:55,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:55,048 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:55,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:55,049 INFO L225 Difference]: With dead ends: 522 [2021-05-22 02:24:55,049 INFO L226 Difference]: Without dead ends: 501 [2021-05-22 02:24:55,049 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 160.3ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:55,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-05-22 02:24:55,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 422. [2021-05-22 02:24:55,052 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 421 states have (on average 3.111638954869359) internal successors, (1310), 421 states have internal predecessors, (1310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 1310 transitions. [2021-05-22 02:24:55,053 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 1310 transitions. Word has length 21 [2021-05-22 02:24:55,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:55,053 INFO L482 AbstractCegarLoop]: Abstraction has 422 states and 1310 transitions. [2021-05-22 02:24:55,053 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,053 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 1310 transitions. [2021-05-22 02:24:55,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:55,054 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:55,054 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:55,254 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1373,308 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:55,254 INFO L430 AbstractCegarLoop]: === Iteration 320 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:55,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:55,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1147084563, now seen corresponding path program 308 times [2021-05-22 02:24:55,254 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:55,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833252888] [2021-05-22 02:24:55,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:55,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:55,339 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:55,339 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:55,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833252888] [2021-05-22 02:24:55,339 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833252888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:55,339 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [268531513] [2021-05-22 02:24:55,339 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 309 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 309 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:55,366 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:55,366 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:55,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:55,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:55,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:55,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:55,412 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:55,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:55,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:55,421 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:24:55,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:55,468 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:55,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:24:55,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:55,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:24:55,471 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:55,488 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:55,490 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:55,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:24:55,491 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:55,508 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:55,509 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:55,509 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:24:55,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:55,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [268531513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:55,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:55,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:55,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812224860] [2021-05-22 02:24:55,543 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:55,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:55,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:55,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:55,543 INFO L87 Difference]: Start difference. First operand 422 states and 1310 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:55,711 INFO L93 Difference]: Finished difference Result 519 states and 1590 transitions. [2021-05-22 02:24:55,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:55,711 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:55,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:55,712 INFO L225 Difference]: With dead ends: 519 [2021-05-22 02:24:55,712 INFO L226 Difference]: Without dead ends: 483 [2021-05-22 02:24:55,712 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 135.8ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:55,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 483 states. [2021-05-22 02:24:55,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 483 to 423. [2021-05-22 02:24:55,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 423 states, 422 states have (on average 3.1161137440758293) internal successors, (1315), 422 states have internal predecessors, (1315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 423 states to 423 states and 1315 transitions. [2021-05-22 02:24:55,716 INFO L78 Accepts]: Start accepts. Automaton has 423 states and 1315 transitions. Word has length 21 [2021-05-22 02:24:55,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:55,716 INFO L482 AbstractCegarLoop]: Abstraction has 423 states and 1315 transitions. [2021-05-22 02:24:55,716 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:55,716 INFO L276 IsEmpty]: Start isEmpty. Operand 423 states and 1315 transitions. [2021-05-22 02:24:55,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:55,717 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:55,717 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:55,917 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 309 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1377 [2021-05-22 02:24:55,917 INFO L430 AbstractCegarLoop]: === Iteration 321 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:55,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:55,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1444350973, now seen corresponding path program 309 times [2021-05-22 02:24:55,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:55,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146997214] [2021-05-22 02:24:55,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:55,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:56,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:56,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:56,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146997214] [2021-05-22 02:24:56,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2146997214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:56,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101091160] [2021-05-22 02:24:56,006 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 310 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 310 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:56,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:24:56,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:56,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:56,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:56,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:56,091 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,093 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:56,094 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,107 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:56,108 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:56,108 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:24:56,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,150 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:56,151 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:56,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,171 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:56,173 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:56,174 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,190 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:56,191 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:56,191 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:24:56,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:56,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101091160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:56,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:56,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:56,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719234318] [2021-05-22 02:24:56,262 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:56,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:56,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:56,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:56,263 INFO L87 Difference]: Start difference. First operand 423 states and 1315 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:56,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:56,556 INFO L93 Difference]: Finished difference Result 614 states and 1865 transitions. [2021-05-22 02:24:56,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:24:56,556 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:56,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:56,557 INFO L225 Difference]: With dead ends: 614 [2021-05-22 02:24:56,557 INFO L226 Difference]: Without dead ends: 591 [2021-05-22 02:24:56,557 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 242.1ms TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:56,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2021-05-22 02:24:56,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 438. [2021-05-22 02:24:56,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.135011441647597) internal successors, (1370), 437 states have internal predecessors, (1370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:56,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1370 transitions. [2021-05-22 02:24:56,562 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1370 transitions. Word has length 21 [2021-05-22 02:24:56,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:56,562 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1370 transitions. [2021-05-22 02:24:56,562 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:56,562 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1370 transitions. [2021-05-22 02:24:56,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:56,563 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:56,563 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:56,763 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1383,310 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:56,763 INFO L430 AbstractCegarLoop]: === Iteration 322 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:56,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:56,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1160088289, now seen corresponding path program 310 times [2021-05-22 02:24:56,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:56,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101185863] [2021-05-22 02:24:56,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:56,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:56,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:56,857 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:56,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101185863] [2021-05-22 02:24:56,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101185863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:56,857 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1245284661] [2021-05-22 02:24:56,857 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 311 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 311 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:56,882 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:24:56,882 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:56,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:56,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:56,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:56,935 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:56,938 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:56,955 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:56,957 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:56,957 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:56,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:56,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:56,999 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:57,002 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:57,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:57,022 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:57,038 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:57,038 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:24:57,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:57,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1245284661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:57,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:57,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:57,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982963614] [2021-05-22 02:24:57,113 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:57,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:57,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:57,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:57,113 INFO L87 Difference]: Start difference. First operand 438 states and 1370 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:57,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:57,372 INFO L93 Difference]: Finished difference Result 612 states and 1866 transitions. [2021-05-22 02:24:57,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:57,372 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:57,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:57,373 INFO L225 Difference]: With dead ends: 612 [2021-05-22 02:24:57,373 INFO L226 Difference]: Without dead ends: 585 [2021-05-22 02:24:57,373 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 267.8ms TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:24:57,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-05-22 02:24:57,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 444. [2021-05-22 02:24:57,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.1331828442437923) internal successors, (1388), 443 states have internal predecessors, (1388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:57,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1388 transitions. [2021-05-22 02:24:57,378 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1388 transitions. Word has length 21 [2021-05-22 02:24:57,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:57,378 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1388 transitions. [2021-05-22 02:24:57,378 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:57,378 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1388 transitions. [2021-05-22 02:24:57,379 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:57,379 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:57,379 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:57,579 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1394,311 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:57,579 INFO L430 AbstractCegarLoop]: === Iteration 323 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:57,580 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:57,580 INFO L82 PathProgramCache]: Analyzing trace with hash -800658677, now seen corresponding path program 311 times [2021-05-22 02:24:57,580 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:57,580 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574716924] [2021-05-22 02:24:57,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:57,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:57,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:57,658 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:57,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574716924] [2021-05-22 02:24:57,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [574716924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:57,658 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968699745] [2021-05-22 02:24:57,658 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 312 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 312 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:57,688 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:24:57,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:57,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:24:57,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:57,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:57,749 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:57,751 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:57,765 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:57,765 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:24:57,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,818 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:57,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:57,822 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,851 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:57,853 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,853 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:57,854 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,856 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:57,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:57,857 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:57,892 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:57,893 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:24:57,893 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:89, output treesize:31 [2021-05-22 02:24:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:57,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968699745] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:57,968 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:57,968 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:57,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484694536] [2021-05-22 02:24:57,968 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:57,968 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:57,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:57,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:57,968 INFO L87 Difference]: Start difference. First operand 444 states and 1388 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:58,211 INFO L93 Difference]: Finished difference Result 525 states and 1608 transitions. [2021-05-22 02:24:58,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:24:58,211 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:58,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:58,212 INFO L225 Difference]: With dead ends: 525 [2021-05-22 02:24:58,212 INFO L226 Difference]: Without dead ends: 506 [2021-05-22 02:24:58,212 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 223.9ms TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:24:58,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-05-22 02:24:58,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 430. [2021-05-22 02:24:58,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.121212121212121) internal successors, (1339), 429 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1339 transitions. [2021-05-22 02:24:58,216 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1339 transitions. Word has length 21 [2021-05-22 02:24:58,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:58,216 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1339 transitions. [2021-05-22 02:24:58,216 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,216 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1339 transitions. [2021-05-22 02:24:58,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:58,217 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:58,217 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:58,417 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 312 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1406 [2021-05-22 02:24:58,417 INFO L430 AbstractCegarLoop]: === Iteration 324 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:58,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:58,417 INFO L82 PathProgramCache]: Analyzing trace with hash -255286023, now seen corresponding path program 312 times [2021-05-22 02:24:58,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:58,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629762558] [2021-05-22 02:24:58,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:58,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:58,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:58,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:58,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629762558] [2021-05-22 02:24:58,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629762558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:58,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820723787] [2021-05-22 02:24:58,501 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 313 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 313 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:58,527 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:24:58,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:58,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:58,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:58,578 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:58,578 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:58,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:58,579 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:58,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:58,582 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:58,599 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:58,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:58,600 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:58,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:58,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:58,693 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:58,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:58,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:58,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:58,702 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:58,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:58,709 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:58,710 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:24:58,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:58,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820723787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:58,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:58,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:24:58,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726147536] [2021-05-22 02:24:58,719 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:24:58,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:58,720 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:24:58,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:24:58,720 INFO L87 Difference]: Start difference. First operand 430 states and 1339 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:58,883 INFO L93 Difference]: Finished difference Result 534 states and 1627 transitions. [2021-05-22 02:24:58,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:58,884 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:58,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:58,884 INFO L225 Difference]: With dead ends: 534 [2021-05-22 02:24:58,884 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:24:58,884 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 178.9ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:24:58,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:24:58,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 430. [2021-05-22 02:24:58,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.1305361305361306) internal successors, (1343), 429 states have internal predecessors, (1343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1343 transitions. [2021-05-22 02:24:58,889 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1343 transitions. Word has length 21 [2021-05-22 02:24:58,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:58,889 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1343 transitions. [2021-05-22 02:24:58,889 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:58,889 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1343 transitions. [2021-05-22 02:24:58,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:58,890 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:58,890 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:59,090 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1415,313 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:59,090 INFO L430 AbstractCegarLoop]: === Iteration 325 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:59,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:59,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1974270705, now seen corresponding path program 313 times [2021-05-22 02:24:59,090 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:59,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597589223] [2021-05-22 02:24:59,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:59,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:59,170 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:59,170 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:59,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597589223] [2021-05-22 02:24:59,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597589223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:59,170 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209851856] [2021-05-22 02:24:59,171 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 314 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 314 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:59,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:59,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:59,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:59,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:24:59,247 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,248 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:59,249 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,267 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:24:59,267 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:24:59,325 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:59,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:59,337 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,345 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,345 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,345 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:24:59,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:59,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209851856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:59,359 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:59,359 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:24:59,359 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995798420] [2021-05-22 02:24:59,360 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:24:59,360 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:59,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:24:59,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:59,360 INFO L87 Difference]: Start difference. First operand 430 states and 1343 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:59,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:24:59,490 INFO L93 Difference]: Finished difference Result 534 states and 1627 transitions. [2021-05-22 02:24:59,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:24:59,491 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:24:59,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:24:59,491 INFO L225 Difference]: With dead ends: 534 [2021-05-22 02:24:59,491 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:24:59,492 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 141.2ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:24:59,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:24:59,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 426. [2021-05-22 02:24:59,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 3.12) internal successors, (1326), 425 states have internal predecessors, (1326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:59,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 1326 transitions. [2021-05-22 02:24:59,496 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 1326 transitions. Word has length 21 [2021-05-22 02:24:59,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:24:59,496 INFO L482 AbstractCegarLoop]: Abstraction has 426 states and 1326 transitions. [2021-05-22 02:24:59,496 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:24:59,496 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 1326 transitions. [2021-05-22 02:24:59,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:24:59,496 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:24:59,497 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:24:59,697 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 314 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1422 [2021-05-22 02:24:59,697 INFO L430 AbstractCegarLoop]: === Iteration 326 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:24:59,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:24:59,697 INFO L82 PathProgramCache]: Analyzing trace with hash -577883527, now seen corresponding path program 314 times [2021-05-22 02:24:59,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:24:59,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714967341] [2021-05-22 02:24:59,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:24:59,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:24:59,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:59,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:24:59,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714967341] [2021-05-22 02:24:59,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714967341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:59,795 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1955989699] [2021-05-22 02:24:59,795 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 315 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 315 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:24:59,820 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:24:59,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:24:59,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:24:59,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:24:59,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:24:59,881 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,888 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,889 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:24:59,889 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:24:59,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:24:59,945 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,953 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:24:59,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:24:59,954 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:24:59,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:24:59,961 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:24:59,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:24:59,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1955989699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:24:59,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:24:59,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:24:59,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [275290312] [2021-05-22 02:24:59,990 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:24:59,990 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:24:59,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:24:59,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:24:59,990 INFO L87 Difference]: Start difference. First operand 426 states and 1326 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:00,265 INFO L93 Difference]: Finished difference Result 593 states and 1803 transitions. [2021-05-22 02:25:00,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:25:00,266 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:00,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:00,266 INFO L225 Difference]: With dead ends: 593 [2021-05-22 02:25:00,267 INFO L226 Difference]: Without dead ends: 572 [2021-05-22 02:25:00,267 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 289.5ms TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:00,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-05-22 02:25:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 428. [2021-05-22 02:25:00,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 3.117096018735363) internal successors, (1331), 427 states have internal predecessors, (1331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 1331 transitions. [2021-05-22 02:25:00,271 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 1331 transitions. Word has length 21 [2021-05-22 02:25:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:00,271 INFO L482 AbstractCegarLoop]: Abstraction has 428 states and 1331 transitions. [2021-05-22 02:25:00,271 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,271 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 1331 transitions. [2021-05-22 02:25:00,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:00,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:00,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:00,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1426,315 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:00,472 INFO L430 AbstractCegarLoop]: === Iteration 327 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:00,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:00,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1907811689, now seen corresponding path program 315 times [2021-05-22 02:25:00,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:00,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235997933] [2021-05-22 02:25:00,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:00,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:00,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:00,555 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:00,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235997933] [2021-05-22 02:25:00,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1235997933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:00,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [937803785] [2021-05-22 02:25:00,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 316 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 316 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:00,581 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:00,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:00,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:00,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:00,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:00,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:00,644 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:00,650 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:00,651 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:00,651 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:25:00,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:00,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:00,679 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:00,687 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:00,689 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:00,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:00,690 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:00,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:00,698 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:00,698 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:25:00,717 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:00,717 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [937803785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:00,717 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:00,717 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:00,717 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306597052] [2021-05-22 02:25:00,717 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:00,717 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:00,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:00,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:00,718 INFO L87 Difference]: Start difference. First operand 428 states and 1331 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:00,827 INFO L93 Difference]: Finished difference Result 515 states and 1576 transitions. [2021-05-22 02:25:00,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:00,827 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:00,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:00,828 INFO L225 Difference]: With dead ends: 515 [2021-05-22 02:25:00,828 INFO L226 Difference]: Without dead ends: 494 [2021-05-22 02:25:00,828 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 131.0ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:00,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 494 states. [2021-05-22 02:25:00,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 494 to 425. [2021-05-22 02:25:00,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 425 states, 424 states have (on average 3.1108490566037736) internal successors, (1319), 424 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 425 states to 425 states and 1319 transitions. [2021-05-22 02:25:00,832 INFO L78 Accepts]: Start accepts. Automaton has 425 states and 1319 transitions. Word has length 21 [2021-05-22 02:25:00,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:00,832 INFO L482 AbstractCegarLoop]: Abstraction has 425 states and 1319 transitions. [2021-05-22 02:25:00,832 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:00,832 INFO L276 IsEmpty]: Start isEmpty. Operand 425 states and 1319 transitions. [2021-05-22 02:25:00,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:00,833 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:00,833 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:01,033 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1432,316 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:01,033 INFO L430 AbstractCegarLoop]: === Iteration 328 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:01,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:01,033 INFO L82 PathProgramCache]: Analyzing trace with hash 1472074119, now seen corresponding path program 316 times [2021-05-22 02:25:01,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:01,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780817175] [2021-05-22 02:25:01,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:01,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:01,122 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:01,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:01,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780817175] [2021-05-22 02:25:01,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780817175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:01,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379395073] [2021-05-22 02:25:01,122 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 317 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 317 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:01,155 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:01,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:01,155 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:01,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:01,217 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:01,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:01,218 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:01,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:01,226 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:25:01,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:01,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:01,253 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,261 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:01,263 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:01,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:01,264 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,272 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:01,272 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,272 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:25:01,315 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:01,315 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379395073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:01,315 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:01,315 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:01,315 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1554004875] [2021-05-22 02:25:01,316 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:01,316 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:01,316 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:01,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:01,316 INFO L87 Difference]: Start difference. First operand 425 states and 1319 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:01,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:01,549 INFO L93 Difference]: Finished difference Result 555 states and 1679 transitions. [2021-05-22 02:25:01,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:01,550 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:01,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:01,550 INFO L225 Difference]: With dead ends: 555 [2021-05-22 02:25:01,551 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:25:01,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 248.6ms TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:01,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:25:01,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 407. [2021-05-22 02:25:01,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 3.0935960591133007) internal successors, (1256), 406 states have internal predecessors, (1256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:01,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 1256 transitions. [2021-05-22 02:25:01,555 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 1256 transitions. Word has length 21 [2021-05-22 02:25:01,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:01,555 INFO L482 AbstractCegarLoop]: Abstraction has 407 states and 1256 transitions. [2021-05-22 02:25:01,555 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:01,555 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 1256 transitions. [2021-05-22 02:25:01,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:01,556 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:01,556 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:01,756 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 317 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1434 [2021-05-22 02:25:01,756 INFO L430 AbstractCegarLoop]: === Iteration 329 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:01,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:01,756 INFO L82 PathProgramCache]: Analyzing trace with hash -1119238299, now seen corresponding path program 317 times [2021-05-22 02:25:01,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:01,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96536797] [2021-05-22 02:25:01,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:01,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:01,813 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:01,813 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:01,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96536797] [2021-05-22 02:25:01,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96536797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:01,813 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775727185] [2021-05-22 02:25:01,813 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 318 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 318 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:01,841 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:01,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:01,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:01,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:01,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:01,861 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:01,863 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:01,870 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:01,870 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:01,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:01,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:01,895 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:01,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:01,896 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:25:01,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:01,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [775727185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:01,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:01,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:01,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911548092] [2021-05-22 02:25:01,904 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:01,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:01,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:01,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:01,904 INFO L87 Difference]: Start difference. First operand 407 states and 1256 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:02,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:02,056 INFO L93 Difference]: Finished difference Result 803 states and 2395 transitions. [2021-05-22 02:25:02,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:02,056 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:02,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:02,057 INFO L225 Difference]: With dead ends: 803 [2021-05-22 02:25:02,057 INFO L226 Difference]: Without dead ends: 781 [2021-05-22 02:25:02,058 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 96.0ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:02,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 781 states. [2021-05-22 02:25:02,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 781 to 415. [2021-05-22 02:25:02,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.101449275362319) internal successors, (1284), 414 states have internal predecessors, (1284), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:02,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1284 transitions. [2021-05-22 02:25:02,063 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1284 transitions. Word has length 21 [2021-05-22 02:25:02,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:02,063 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1284 transitions. [2021-05-22 02:25:02,063 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:02,063 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1284 transitions. [2021-05-22 02:25:02,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:02,064 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:02,064 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:02,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1436,318 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:02,264 INFO L430 AbstractCegarLoop]: === Iteration 330 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:02,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:02,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1085940175, now seen corresponding path program 318 times [2021-05-22 02:25:02,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:02,264 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641882082] [2021-05-22 02:25:02,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:02,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:02,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:02,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:02,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641882082] [2021-05-22 02:25:02,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641882082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:02,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607201477] [2021-05-22 02:25:02,333 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 319 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 319 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:02,367 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:02,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:02,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:02,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:02,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:02,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:02,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:02,394 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:02,400 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:02,400 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:02,400 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:02,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:02,459 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:02,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:02,461 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:02,461 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:02,461 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:02,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:02,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607201477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:02,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:02,487 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:02,487 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473591944] [2021-05-22 02:25:02,487 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:02,487 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:02,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:02,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:02,487 INFO L87 Difference]: Start difference. First operand 415 states and 1284 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:03,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:03,389 INFO L93 Difference]: Finished difference Result 932 states and 2784 transitions. [2021-05-22 02:25:03,390 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:25:03,390 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:03,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:03,391 INFO L225 Difference]: With dead ends: 932 [2021-05-22 02:25:03,391 INFO L226 Difference]: Without dead ends: 913 [2021-05-22 02:25:03,391 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 561 ImplicationChecksByTransitivity, 628.8ms TimeCoverageRelationStatistics Valid=364, Invalid=1706, Unknown=0, NotChecked=0, Total=2070 [2021-05-22 02:25:03,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 913 states. [2021-05-22 02:25:03,396 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 913 to 421. [2021-05-22 02:25:03,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 421 states, 420 states have (on average 3.111904761904762) internal successors, (1307), 420 states have internal predecessors, (1307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:03,397 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 1307 transitions. [2021-05-22 02:25:03,397 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 1307 transitions. Word has length 21 [2021-05-22 02:25:03,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:03,397 INFO L482 AbstractCegarLoop]: Abstraction has 421 states and 1307 transitions. [2021-05-22 02:25:03,397 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:03,397 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 1307 transitions. [2021-05-22 02:25:03,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:03,397 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:03,397 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:03,598 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 319 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1439 [2021-05-22 02:25:03,598 INFO L430 AbstractCegarLoop]: === Iteration 331 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:03,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:03,598 INFO L82 PathProgramCache]: Analyzing trace with hash 2042705297, now seen corresponding path program 319 times [2021-05-22 02:25:03,598 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:03,598 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157099614] [2021-05-22 02:25:03,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:03,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:03,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:03,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:03,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157099614] [2021-05-22 02:25:03,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157099614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:03,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355515274] [2021-05-22 02:25:03,667 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 320 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 320 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:03,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:03,700 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:03,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:03,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:03,719 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:03,723 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:03,723 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:03,723 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:03,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:03,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:03,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:03,780 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:03,782 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:03,782 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:03,783 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:03,783 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:25:03,807 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:03,807 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355515274] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:03,808 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:03,808 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:03,808 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932201090] [2021-05-22 02:25:03,808 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:03,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:03,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:03,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:03,808 INFO L87 Difference]: Start difference. First operand 421 states and 1307 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:04,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:04,163 INFO L93 Difference]: Finished difference Result 845 states and 2529 transitions. [2021-05-22 02:25:04,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:04,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:04,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:04,164 INFO L225 Difference]: With dead ends: 845 [2021-05-22 02:25:04,164 INFO L226 Difference]: Without dead ends: 806 [2021-05-22 02:25:04,164 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 290.2ms TimeCoverageRelationStatistics Valid=161, Invalid=541, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:25:04,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 806 states. [2021-05-22 02:25:04,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 806 to 422. [2021-05-22 02:25:04,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 421 states have (on average 3.1045130641330165) internal successors, (1307), 421 states have internal predecessors, (1307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:04,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 1307 transitions. [2021-05-22 02:25:04,170 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 1307 transitions. Word has length 21 [2021-05-22 02:25:04,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:04,170 INFO L482 AbstractCegarLoop]: Abstraction has 422 states and 1307 transitions. [2021-05-22 02:25:04,170 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:04,170 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 1307 transitions. [2021-05-22 02:25:04,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:04,171 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:04,171 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:04,371 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 320 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1445 [2021-05-22 02:25:04,371 INFO L430 AbstractCegarLoop]: === Iteration 332 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:04,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:04,372 INFO L82 PathProgramCache]: Analyzing trace with hash -856760017, now seen corresponding path program 320 times [2021-05-22 02:25:04,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:04,372 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1778627870] [2021-05-22 02:25:04,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:04,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:04,442 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:04,442 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:04,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1778627870] [2021-05-22 02:25:04,443 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1778627870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:04,443 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [530074531] [2021-05-22 02:25:04,443 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 321 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 321 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:04,469 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:04,469 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:04,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:04,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:04,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:04,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:04,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:04,496 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:04,502 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:04,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:04,502 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:04,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:04,565 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:04,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:04,567 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:04,568 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:04,568 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:04,592 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:04,592 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [530074531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:04,592 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:04,592 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:04,593 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611030040] [2021-05-22 02:25:04,593 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:04,593 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:04,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:04,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:04,593 INFO L87 Difference]: Start difference. First operand 422 states and 1307 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:05,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:05,281 INFO L93 Difference]: Finished difference Result 908 states and 2743 transitions. [2021-05-22 02:25:05,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:25:05,281 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:05,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:05,282 INFO L225 Difference]: With dead ends: 908 [2021-05-22 02:25:05,283 INFO L226 Difference]: Without dead ends: 889 [2021-05-22 02:25:05,283 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 523.3ms TimeCoverageRelationStatistics Valid=250, Invalid=1156, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:25:05,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 889 states. [2021-05-22 02:25:05,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 889 to 432. [2021-05-22 02:25:05,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1183294663573085) internal successors, (1344), 431 states have internal predecessors, (1344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:05,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1344 transitions. [2021-05-22 02:25:05,289 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1344 transitions. Word has length 21 [2021-05-22 02:25:05,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:05,289 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1344 transitions. [2021-05-22 02:25:05,289 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:05,289 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1344 transitions. [2021-05-22 02:25:05,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:05,289 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:05,289 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:05,490 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1448,321 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:05,490 INFO L430 AbstractCegarLoop]: === Iteration 333 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:05,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:05,490 INFO L82 PathProgramCache]: Analyzing trace with hash 829631823, now seen corresponding path program 321 times [2021-05-22 02:25:05,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:05,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80731425] [2021-05-22 02:25:05,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:05,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:05,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:05,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:05,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80731425] [2021-05-22 02:25:05,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80731425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:05,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325670577] [2021-05-22 02:25:05,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 322 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 322 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:05,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:05,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:05,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:05,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:05,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:05,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:05,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:05,607 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:05,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:05,614 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:05,614 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:05,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:05,662 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:05,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:05,664 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:05,670 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:05,670 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:05,670 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:05,671 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:25:05,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:05,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325670577] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:05,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:05,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:05,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985894996] [2021-05-22 02:25:05,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:05,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:05,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:05,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:05,713 INFO L87 Difference]: Start difference. First operand 432 states and 1344 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:06,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:06,500 INFO L93 Difference]: Finished difference Result 986 states and 2968 transitions. [2021-05-22 02:25:06,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 02:25:06,500 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:06,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:06,501 INFO L225 Difference]: With dead ends: 986 [2021-05-22 02:25:06,501 INFO L226 Difference]: Without dead ends: 963 [2021-05-22 02:25:06,501 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 563.1ms TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-05-22 02:25:06,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2021-05-22 02:25:06,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 435. [2021-05-22 02:25:06,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 3.133640552995392) internal successors, (1360), 434 states have internal predecessors, (1360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:06,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 1360 transitions. [2021-05-22 02:25:06,507 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 1360 transitions. Word has length 21 [2021-05-22 02:25:06,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:06,507 INFO L482 AbstractCegarLoop]: Abstraction has 435 states and 1360 transitions. [2021-05-22 02:25:06,507 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:06,507 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 1360 transitions. [2021-05-22 02:25:06,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:06,508 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:06,508 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:06,708 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 322 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1454 [2021-05-22 02:25:06,708 INFO L430 AbstractCegarLoop]: === Iteration 334 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:06,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:06,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1493592683, now seen corresponding path program 322 times [2021-05-22 02:25:06,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:06,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021926304] [2021-05-22 02:25:06,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:06,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:06,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:06,768 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:06,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021926304] [2021-05-22 02:25:06,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021926304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:06,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585678397] [2021-05-22 02:25:06,769 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 323 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 323 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:06,794 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:06,794 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:06,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:06,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:06,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:06,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:06,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:06,815 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:06,821 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:06,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:06,822 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:06,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:06,845 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:06,847 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:06,847 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:06,848 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:06,848 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:25:06,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:06,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585678397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:06,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:06,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:06,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948383927] [2021-05-22 02:25:06,856 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:06,856 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:06,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:06,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:06,856 INFO L87 Difference]: Start difference. First operand 435 states and 1360 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:07,024 INFO L93 Difference]: Finished difference Result 833 states and 2532 transitions. [2021-05-22 02:25:07,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:07,024 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:07,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:07,025 INFO L225 Difference]: With dead ends: 833 [2021-05-22 02:25:07,025 INFO L226 Difference]: Without dead ends: 811 [2021-05-22 02:25:07,025 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 108.8ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:07,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 811 states. [2021-05-22 02:25:07,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 811 to 438. [2021-05-22 02:25:07,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.130434782608696) internal successors, (1368), 437 states have internal predecessors, (1368), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1368 transitions. [2021-05-22 02:25:07,031 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1368 transitions. Word has length 21 [2021-05-22 02:25:07,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:07,031 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1368 transitions. [2021-05-22 02:25:07,031 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,031 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1368 transitions. [2021-05-22 02:25:07,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:07,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:07,032 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:07,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1461,323 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:07,232 INFO L430 AbstractCegarLoop]: === Iteration 335 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:07,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:07,232 INFO L82 PathProgramCache]: Analyzing trace with hash -920621675, now seen corresponding path program 323 times [2021-05-22 02:25:07,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:07,232 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939310619] [2021-05-22 02:25:07,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:07,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:07,293 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:07,293 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:07,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939310619] [2021-05-22 02:25:07,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939310619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:07,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1837624788] [2021-05-22 02:25:07,293 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 324 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 324 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:07,319 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:07,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:07,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:07,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:07,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:07,338 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:07,340 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,346 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:07,346 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:07,346 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:07,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:07,369 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:07,370 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,376 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:07,376 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:07,377 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:07,377 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:07,393 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:07,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1837624788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:07,393 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:07,393 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:07,393 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107721648] [2021-05-22 02:25:07,393 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:07,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:07,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:07,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:07,394 INFO L87 Difference]: Start difference. First operand 438 states and 1368 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:07,584 INFO L93 Difference]: Finished difference Result 836 states and 2534 transitions. [2021-05-22 02:25:07,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:07,585 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:07,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:07,586 INFO L225 Difference]: With dead ends: 836 [2021-05-22 02:25:07,586 INFO L226 Difference]: Without dead ends: 807 [2021-05-22 02:25:07,586 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 115.1ms TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:07,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 807 states. [2021-05-22 02:25:07,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 807 to 429. [2021-05-22 02:25:07,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 3.121495327102804) internal successors, (1336), 428 states have internal predecessors, (1336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 1336 transitions. [2021-05-22 02:25:07,591 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 1336 transitions. Word has length 21 [2021-05-22 02:25:07,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:07,592 INFO L482 AbstractCegarLoop]: Abstraction has 429 states and 1336 transitions. [2021-05-22 02:25:07,592 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:07,592 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 1336 transitions. [2021-05-22 02:25:07,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:07,592 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:07,592 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:07,792 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 324 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1465 [2021-05-22 02:25:07,793 INFO L430 AbstractCegarLoop]: === Iteration 336 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:07,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:07,793 INFO L82 PathProgramCache]: Analyzing trace with hash -294750883, now seen corresponding path program 324 times [2021-05-22 02:25:07,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:07,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [550007762] [2021-05-22 02:25:07,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:07,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:07,859 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:07,859 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:07,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [550007762] [2021-05-22 02:25:07,859 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [550007762] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:07,859 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [133982443] [2021-05-22 02:25:07,859 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 325 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 325 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:07,885 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:07,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:07,885 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:07,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:07,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:07,913 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,916 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:07,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,916 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:25:07,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:07,954 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,956 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:07,956 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:07,957 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:07,957 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:07,985 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:07,986 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [133982443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:07,986 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:07,986 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:07,986 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235080487] [2021-05-22 02:25:07,986 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:07,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:07,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:07,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:07,986 INFO L87 Difference]: Start difference. First operand 429 states and 1336 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:08,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:08,691 INFO L93 Difference]: Finished difference Result 845 states and 2541 transitions. [2021-05-22 02:25:08,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-22 02:25:08,692 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:08,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:08,693 INFO L225 Difference]: With dead ends: 845 [2021-05-22 02:25:08,693 INFO L226 Difference]: Without dead ends: 826 [2021-05-22 02:25:08,693 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 478.6ms TimeCoverageRelationStatistics Valid=278, Invalid=1204, Unknown=0, NotChecked=0, Total=1482 [2021-05-22 02:25:08,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 826 states. [2021-05-22 02:25:08,698 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 826 to 437. [2021-05-22 02:25:08,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 436 states have (on average 3.1192660550458715) internal successors, (1360), 436 states have internal predecessors, (1360), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:08,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 1360 transitions. [2021-05-22 02:25:08,699 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 1360 transitions. Word has length 21 [2021-05-22 02:25:08,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:08,699 INFO L482 AbstractCegarLoop]: Abstraction has 437 states and 1360 transitions. [2021-05-22 02:25:08,699 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:08,699 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 1360 transitions. [2021-05-22 02:25:08,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:08,699 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:08,699 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:08,900 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1470,325 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:08,900 INFO L430 AbstractCegarLoop]: === Iteration 337 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:08,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:08,900 INFO L82 PathProgramCache]: Analyzing trace with hash -96134259, now seen corresponding path program 325 times [2021-05-22 02:25:08,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:08,900 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330424787] [2021-05-22 02:25:08,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:08,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:08,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:08,963 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:08,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330424787] [2021-05-22 02:25:08,963 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [330424787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:08,963 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1394766363] [2021-05-22 02:25:08,963 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 326 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 326 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:08,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:08,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:08,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:09,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:09,027 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,031 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:09,031 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,031 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:09,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:09,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,052 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:09,052 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:09,053 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,053 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:09,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:09,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1394766363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:09,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:09,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:09,066 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892575484] [2021-05-22 02:25:09,066 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:09,066 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:09,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:09,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:09,066 INFO L87 Difference]: Start difference. First operand 437 states and 1360 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:09,198 INFO L93 Difference]: Finished difference Result 560 states and 1715 transitions. [2021-05-22 02:25:09,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:09,198 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:09,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:09,199 INFO L225 Difference]: With dead ends: 560 [2021-05-22 02:25:09,199 INFO L226 Difference]: Without dead ends: 541 [2021-05-22 02:25:09,199 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 89.0ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:09,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-22 02:25:09,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 433. [2021-05-22 02:25:09,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 3.1203703703703702) internal successors, (1348), 432 states have internal predecessors, (1348), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 1348 transitions. [2021-05-22 02:25:09,204 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 1348 transitions. Word has length 21 [2021-05-22 02:25:09,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:09,204 INFO L482 AbstractCegarLoop]: Abstraction has 433 states and 1348 transitions. [2021-05-22 02:25:09,204 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,204 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 1348 transitions. [2021-05-22 02:25:09,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:09,204 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:09,204 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:09,405 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1472,326 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:09,405 INFO L430 AbstractCegarLoop]: === Iteration 338 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:09,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:09,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1012015205, now seen corresponding path program 326 times [2021-05-22 02:25:09,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:09,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468104026] [2021-05-22 02:25:09,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:09,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:09,466 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:09,466 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:09,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468104026] [2021-05-22 02:25:09,466 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468104026] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:09,466 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632776341] [2021-05-22 02:25:09,466 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 327 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 327 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:09,491 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:09,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:09,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:09,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:09,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:09,525 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:09,528 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,534 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:09,534 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:09,534 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:09,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:09,547 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:09,550 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:09,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:09,550 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:25:09,558 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:09,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632776341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:09,558 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:09,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:09,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202553652] [2021-05-22 02:25:09,558 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:09,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:09,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:09,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:09,559 INFO L87 Difference]: Start difference. First operand 433 states and 1348 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:09,724 INFO L93 Difference]: Finished difference Result 684 states and 2073 transitions. [2021-05-22 02:25:09,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:09,725 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:09,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:09,725 INFO L225 Difference]: With dead ends: 684 [2021-05-22 02:25:09,725 INFO L226 Difference]: Without dead ends: 662 [2021-05-22 02:25:09,726 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 99.0ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:09,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-05-22 02:25:09,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 440. [2021-05-22 02:25:09,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 439 states have (on average 3.1252847380410023) internal successors, (1372), 439 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 1372 transitions. [2021-05-22 02:25:09,730 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 1372 transitions. Word has length 21 [2021-05-22 02:25:09,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:09,730 INFO L482 AbstractCegarLoop]: Abstraction has 440 states and 1372 transitions. [2021-05-22 02:25:09,730 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:09,731 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 1372 transitions. [2021-05-22 02:25:09,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:09,731 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:09,731 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:09,931 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 327 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1474 [2021-05-22 02:25:09,931 INFO L430 AbstractCegarLoop]: === Iteration 339 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:09,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:09,932 INFO L82 PathProgramCache]: Analyzing trace with hash 1436087115, now seen corresponding path program 327 times [2021-05-22 02:25:09,932 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:09,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975560335] [2021-05-22 02:25:09,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:09,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:09,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:09,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:09,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975560335] [2021-05-22 02:25:09,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975560335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:09,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009121659] [2021-05-22 02:25:09,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 328 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 328 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:10,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:10,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:10,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:10,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:10,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:10,043 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:10,047 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,047 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:10,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:10,080 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:10,082 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,084 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:10,085 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:10,085 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:10,085 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:25:10,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:10,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009121659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:10,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:10,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:10,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542784487] [2021-05-22 02:25:10,092 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:10,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:10,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:10,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:10,093 INFO L87 Difference]: Start difference. First operand 440 states and 1372 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:10,257 INFO L93 Difference]: Finished difference Result 692 states and 2093 transitions. [2021-05-22 02:25:10,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:10,258 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:10,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:10,258 INFO L225 Difference]: With dead ends: 692 [2021-05-22 02:25:10,259 INFO L226 Difference]: Without dead ends: 659 [2021-05-22 02:25:10,259 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 110.6ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:10,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-05-22 02:25:10,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 440. [2021-05-22 02:25:10,263 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 439 states have (on average 3.1184510250569475) internal successors, (1369), 439 states have internal predecessors, (1369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 1369 transitions. [2021-05-22 02:25:10,264 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 1369 transitions. Word has length 21 [2021-05-22 02:25:10,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:10,264 INFO L482 AbstractCegarLoop]: Abstraction has 440 states and 1369 transitions. [2021-05-22 02:25:10,264 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,264 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 1369 transitions. [2021-05-22 02:25:10,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:10,264 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:10,264 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:10,465 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1477,328 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:10,465 INFO L430 AbstractCegarLoop]: === Iteration 340 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:10,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:10,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1402199153, now seen corresponding path program 328 times [2021-05-22 02:25:10,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:10,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513430495] [2021-05-22 02:25:10,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:10,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:10,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:10,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:10,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513430495] [2021-05-22 02:25:10,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513430495] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:10,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459686033] [2021-05-22 02:25:10,525 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 329 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 329 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:10,550 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:10,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:10,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:10,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:10,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:10,579 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:10,581 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:10,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:10,588 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:10,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:10,600 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:10,601 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:10,607 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:10,607 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:10,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:10,608 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:10,624 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:10,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459686033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:10,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:10,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:10,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1771468369] [2021-05-22 02:25:10,625 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:10,625 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:10,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:10,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:10,625 INFO L87 Difference]: Start difference. First operand 440 states and 1369 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:10,784 INFO L93 Difference]: Finished difference Result 730 states and 2211 transitions. [2021-05-22 02:25:10,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:10,784 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:10,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:10,785 INFO L225 Difference]: With dead ends: 730 [2021-05-22 02:25:10,785 INFO L226 Difference]: Without dead ends: 701 [2021-05-22 02:25:10,785 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 104.7ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:10,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2021-05-22 02:25:10,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 441. [2021-05-22 02:25:10,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 3.125) internal successors, (1375), 440 states have internal predecessors, (1375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 1375 transitions. [2021-05-22 02:25:10,790 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 1375 transitions. Word has length 21 [2021-05-22 02:25:10,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:10,790 INFO L482 AbstractCegarLoop]: Abstraction has 441 states and 1375 transitions. [2021-05-22 02:25:10,790 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:10,790 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 1375 transitions. [2021-05-22 02:25:10,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:10,791 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:10,791 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:10,991 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1480,329 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:10,991 INFO L430 AbstractCegarLoop]: === Iteration 341 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:10,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:10,992 INFO L82 PathProgramCache]: Analyzing trace with hash 1798069225, now seen corresponding path program 329 times [2021-05-22 02:25:10,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:10,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [562260211] [2021-05-22 02:25:10,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:10,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:11,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:11,051 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:11,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [562260211] [2021-05-22 02:25:11,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [562260211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:11,051 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941603131] [2021-05-22 02:25:11,051 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 330 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 330 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:11,076 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:11,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:11,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:11,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:11,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:11,117 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:11,121 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,121 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:11,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:11,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:11,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:11,149 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:11,149 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:11,149 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:25:11,177 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:11,177 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941603131] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:11,177 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:11,177 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:11,177 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1300185282] [2021-05-22 02:25:11,177 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:11,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:11,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:11,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:11,178 INFO L87 Difference]: Start difference. First operand 441 states and 1375 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:11,388 INFO L93 Difference]: Finished difference Result 687 states and 2075 transitions. [2021-05-22 02:25:11,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:11,388 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:11,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:11,389 INFO L225 Difference]: With dead ends: 687 [2021-05-22 02:25:11,389 INFO L226 Difference]: Without dead ends: 660 [2021-05-22 02:25:11,389 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 130.4ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:11,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-22 02:25:11,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 436. [2021-05-22 02:25:11,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 3.117241379310345) internal successors, (1356), 435 states have internal predecessors, (1356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 1356 transitions. [2021-05-22 02:25:11,394 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 1356 transitions. Word has length 21 [2021-05-22 02:25:11,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:11,394 INFO L482 AbstractCegarLoop]: Abstraction has 436 states and 1356 transitions. [2021-05-22 02:25:11,394 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,394 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 1356 transitions. [2021-05-22 02:25:11,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:11,395 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:11,395 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:11,595 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 330 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1484 [2021-05-22 02:25:11,595 INFO L430 AbstractCegarLoop]: === Iteration 342 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:11,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:11,596 INFO L82 PathProgramCache]: Analyzing trace with hash 704584967, now seen corresponding path program 330 times [2021-05-22 02:25:11,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:11,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190522263] [2021-05-22 02:25:11,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:11,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:11,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:11,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:11,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190522263] [2021-05-22 02:25:11,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [190522263] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:11,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1363178073] [2021-05-22 02:25:11,657 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 331 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 331 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:11,683 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:11,683 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:11,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:11,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:11,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:11,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,711 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:11,711 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,711 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:25:11,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:25:11,730 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:25:11,733 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:11,738 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:11,738 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:11,739 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:11,739 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:11,755 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:11,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1363178073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:11,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:11,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:11,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613282548] [2021-05-22 02:25:11,755 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:11,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:11,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:11,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:11,756 INFO L87 Difference]: Start difference. First operand 436 states and 1356 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:11,930 INFO L93 Difference]: Finished difference Result 697 states and 2107 transitions. [2021-05-22 02:25:11,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:11,931 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:11,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:11,932 INFO L225 Difference]: With dead ends: 697 [2021-05-22 02:25:11,932 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:25:11,932 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 108.0ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:11,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:25:11,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 437. [2021-05-22 02:25:11,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 436 states have (on average 3.121559633027523) internal successors, (1361), 436 states have internal predecessors, (1361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 1361 transitions. [2021-05-22 02:25:11,937 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 1361 transitions. Word has length 21 [2021-05-22 02:25:11,937 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:11,937 INFO L482 AbstractCegarLoop]: Abstraction has 437 states and 1361 transitions. [2021-05-22 02:25:11,937 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:11,937 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 1361 transitions. [2021-05-22 02:25:11,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:11,937 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:11,937 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:12,138 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 331 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1490 [2021-05-22 02:25:12,138 INFO L430 AbstractCegarLoop]: === Iteration 343 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:12,138 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:12,138 INFO L82 PathProgramCache]: Analyzing trace with hash -390113951, now seen corresponding path program 331 times [2021-05-22 02:25:12,138 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:12,138 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127585957] [2021-05-22 02:25:12,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:12,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:12,199 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:12,200 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:12,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127585957] [2021-05-22 02:25:12,200 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127585957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:12,200 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161983663] [2021-05-22 02:25:12,200 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 332 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 332 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:12,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:12,224 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:12,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:12,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:12,258 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:12,261 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,267 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:12,267 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:12,267 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:12,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:12,292 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,299 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:12,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:12,301 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,307 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:12,307 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:12,307 INFO L518 ElimStorePlain]: Eliminatee v_prenex_51 vanished before elimination [2021-05-22 02:25:12,308 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:12,308 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:25:12,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:12,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161983663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:12,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:12,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:12,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907495375] [2021-05-22 02:25:12,336 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:12,336 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:12,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:12,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:12,336 INFO L87 Difference]: Start difference. First operand 437 states and 1361 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:12,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:12,585 INFO L93 Difference]: Finished difference Result 738 states and 2222 transitions. [2021-05-22 02:25:12,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:12,585 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:12,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:12,586 INFO L225 Difference]: With dead ends: 738 [2021-05-22 02:25:12,586 INFO L226 Difference]: Without dead ends: 711 [2021-05-22 02:25:12,587 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 165.6ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:25:12,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 711 states. [2021-05-22 02:25:12,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 711 to 457. [2021-05-22 02:25:12,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.142543859649123) internal successors, (1433), 456 states have internal predecessors, (1433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:12,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1433 transitions. [2021-05-22 02:25:12,592 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1433 transitions. Word has length 21 [2021-05-22 02:25:12,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:12,592 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1433 transitions. [2021-05-22 02:25:12,592 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:12,592 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1433 transitions. [2021-05-22 02:25:12,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:12,593 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:12,593 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:12,793 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1493,332 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:12,793 INFO L430 AbstractCegarLoop]: === Iteration 344 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:12,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:12,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1490638987, now seen corresponding path program 332 times [2021-05-22 02:25:12,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:12,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349778127] [2021-05-22 02:25:12,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:12,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:12,853 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:12,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349778127] [2021-05-22 02:25:12,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [349778127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:12,853 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [982143724] [2021-05-22 02:25:12,853 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 333 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 333 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:12,878 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:12,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:12,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:12,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:12,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:12,912 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:12,914 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,920 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:12,921 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:12,921 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:12,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:12,951 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,954 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:12,954 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:12,954 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:12,954 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:12,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:12,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [982143724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:12,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:12,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:12,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191647514] [2021-05-22 02:25:12,964 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:12,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:12,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:12,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:12,964 INFO L87 Difference]: Start difference. First operand 457 states and 1433 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:13,176 INFO L93 Difference]: Finished difference Result 698 states and 2107 transitions. [2021-05-22 02:25:13,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:13,176 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:13,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:13,177 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:25:13,177 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:25:13,177 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 129.5ms TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:13,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:25:13,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 432. [2021-05-22 02:25:13,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1345707656612527) internal successors, (1351), 431 states have internal predecessors, (1351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1351 transitions. [2021-05-22 02:25:13,182 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1351 transitions. Word has length 21 [2021-05-22 02:25:13,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:13,183 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1351 transitions. [2021-05-22 02:25:13,183 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,183 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1351 transitions. [2021-05-22 02:25:13,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:13,183 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:13,183 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:13,383 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 333 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1501 [2021-05-22 02:25:13,384 INFO L430 AbstractCegarLoop]: === Iteration 345 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:13,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:13,384 INFO L82 PathProgramCache]: Analyzing trace with hash -393240531, now seen corresponding path program 333 times [2021-05-22 02:25:13,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:13,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457028622] [2021-05-22 02:25:13,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:13,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:13,458 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:13,458 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:13,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457028622] [2021-05-22 02:25:13,458 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457028622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:13,458 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1796659962] [2021-05-22 02:25:13,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 334 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 334 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:13,484 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:13,484 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:13,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:13,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:13,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:13,538 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:13,542 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:13,542 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:13,542 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:13,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:13,558 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:13,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:13,561 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:13,562 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:13,562 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:13,573 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:13,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1796659962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:13,574 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:13,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:13,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648826336] [2021-05-22 02:25:13,574 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:13,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:13,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:13,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:13,574 INFO L87 Difference]: Start difference. First operand 432 states and 1351 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:13,708 INFO L93 Difference]: Finished difference Result 601 states and 1845 transitions. [2021-05-22 02:25:13,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:13,708 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:13,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:13,709 INFO L225 Difference]: With dead ends: 601 [2021-05-22 02:25:13,709 INFO L226 Difference]: Without dead ends: 582 [2021-05-22 02:25:13,709 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 123.1ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:13,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2021-05-22 02:25:13,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 428. [2021-05-22 02:25:13,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 3.1358313817330212) internal successors, (1339), 427 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 1339 transitions. [2021-05-22 02:25:13,713 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 1339 transitions. Word has length 21 [2021-05-22 02:25:13,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:13,714 INFO L482 AbstractCegarLoop]: Abstraction has 428 states and 1339 transitions. [2021-05-22 02:25:13,714 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:13,714 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 1339 transitions. [2021-05-22 02:25:13,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:13,714 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:13,714 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:13,914 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1504,334 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:13,915 INFO L430 AbstractCegarLoop]: === Iteration 346 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:13,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:13,915 INFO L82 PathProgramCache]: Analyzing trace with hash -715838035, now seen corresponding path program 334 times [2021-05-22 02:25:13,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:13,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842021018] [2021-05-22 02:25:13,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:13,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:13,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:13,999 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:13,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842021018] [2021-05-22 02:25:13,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [842021018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:13,999 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223987996] [2021-05-22 02:25:13,999 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 335 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 335 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:14,023 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:14,023 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:14,024 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:14,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:14,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:14,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:14,075 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,084 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:14,084 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:14,084 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:14,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:14,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,120 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:14,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:14,123 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:14,131 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:14,131 INFO L518 ElimStorePlain]: Eliminatee v_prenex_52 vanished before elimination [2021-05-22 02:25:14,132 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:14,132 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:25:14,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:14,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223987996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:14,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:14,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:14,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285070785] [2021-05-22 02:25:14,162 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:14,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:14,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:14,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:14,162 INFO L87 Difference]: Start difference. First operand 428 states and 1339 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:14,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:14,371 INFO L93 Difference]: Finished difference Result 664 states and 2018 transitions. [2021-05-22 02:25:14,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:14,372 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:14,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:14,372 INFO L225 Difference]: With dead ends: 664 [2021-05-22 02:25:14,372 INFO L226 Difference]: Without dead ends: 641 [2021-05-22 02:25:14,373 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 170.5ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:14,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-22 02:25:14,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 432. [2021-05-22 02:25:14,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.1322505800464038) internal successors, (1350), 431 states have internal predecessors, (1350), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:14,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1350 transitions. [2021-05-22 02:25:14,378 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1350 transitions. Word has length 21 [2021-05-22 02:25:14,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:14,378 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1350 transitions. [2021-05-22 02:25:14,378 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:14,378 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1350 transitions. [2021-05-22 02:25:14,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:14,378 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:14,378 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:14,578 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1507,335 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:14,579 INFO L430 AbstractCegarLoop]: === Iteration 347 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:14,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:14,579 INFO L82 PathProgramCache]: Analyzing trace with hash 1334119611, now seen corresponding path program 335 times [2021-05-22 02:25:14,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:14,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903485942] [2021-05-22 02:25:14,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:14,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:14,660 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:14,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903485942] [2021-05-22 02:25:14,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903485942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:14,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230348870] [2021-05-22 02:25:14,661 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 336 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 336 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:14,686 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:14,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:14,687 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:14,687 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:14,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:14,728 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:14,730 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,738 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:14,739 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:14,739 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:14,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:14,775 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:14,777 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:14,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:14,792 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:14,792 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:14,792 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:25:14,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:14,867 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230348870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:14,867 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:14,867 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:14,867 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195439840] [2021-05-22 02:25:14,867 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:14,867 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:14,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:14,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:14,867 INFO L87 Difference]: Start difference. First operand 432 states and 1350 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:15,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:15,277 INFO L93 Difference]: Finished difference Result 702 states and 2144 transitions. [2021-05-22 02:25:15,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:15,277 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:15,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:15,278 INFO L225 Difference]: With dead ends: 702 [2021-05-22 02:25:15,278 INFO L226 Difference]: Without dead ends: 683 [2021-05-22 02:25:15,278 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 330.6ms TimeCoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:15,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2021-05-22 02:25:15,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 427. [2021-05-22 02:25:15,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 426 states have (on average 3.1267605633802815) internal successors, (1332), 426 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:15,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 1332 transitions. [2021-05-22 02:25:15,283 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 1332 transitions. Word has length 21 [2021-05-22 02:25:15,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:15,283 INFO L482 AbstractCegarLoop]: Abstraction has 427 states and 1332 transitions. [2021-05-22 02:25:15,283 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:15,283 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 1332 transitions. [2021-05-22 02:25:15,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:15,284 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:15,284 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:15,484 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1514,336 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:15,484 INFO L430 AbstractCegarLoop]: === Iteration 348 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:15,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:15,484 INFO L82 PathProgramCache]: Analyzing trace with hash 946949131, now seen corresponding path program 336 times [2021-05-22 02:25:15,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:15,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [364670550] [2021-05-22 02:25:15,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:15,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:15,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:15,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:15,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [364670550] [2021-05-22 02:25:15,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [364670550] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:15,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056426967] [2021-05-22 02:25:15,580 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 337 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 337 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:15,606 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:15,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:15,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:15,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:15,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:15,624 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:15,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:15,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:15,627 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:25:15,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:15,670 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:15,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:15,673 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:15,673 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:15,673 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:15,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:15,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056426967] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:15,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:15,697 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:15,697 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1424802416] [2021-05-22 02:25:15,697 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:15,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:15,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:15,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:15,698 INFO L87 Difference]: Start difference. First operand 427 states and 1332 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:16,300 INFO L93 Difference]: Finished difference Result 929 states and 2770 transitions. [2021-05-22 02:25:16,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 02:25:16,301 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:16,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:16,302 INFO L225 Difference]: With dead ends: 929 [2021-05-22 02:25:16,302 INFO L226 Difference]: Without dead ends: 910 [2021-05-22 02:25:16,302 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 314 ImplicationChecksByTransitivity, 436.2ms TimeCoverageRelationStatistics Valid=274, Invalid=1132, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:25:16,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 910 states. [2021-05-22 02:25:16,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 910 to 427. [2021-05-22 02:25:16,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 426 states have (on average 3.107981220657277) internal successors, (1324), 426 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 1324 transitions. [2021-05-22 02:25:16,308 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 1324 transitions. Word has length 21 [2021-05-22 02:25:16,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:16,308 INFO L482 AbstractCegarLoop]: Abstraction has 427 states and 1324 transitions. [2021-05-22 02:25:16,308 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,308 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 1324 transitions. [2021-05-22 02:25:16,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:16,308 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:16,308 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:16,508 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 337 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1521 [2021-05-22 02:25:16,509 INFO L430 AbstractCegarLoop]: === Iteration 349 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:16,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:16,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1145565755, now seen corresponding path program 337 times [2021-05-22 02:25:16,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:16,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215140638] [2021-05-22 02:25:16,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:16,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:16,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:16,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:16,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215140638] [2021-05-22 02:25:16,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215140638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:16,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388649478] [2021-05-22 02:25:16,572 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 338 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 338 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:16,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:16,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:16,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:16,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:16,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:16,627 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:16,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:16,628 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:16,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:16,642 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:16,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:16,646 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:16,646 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:16,646 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:16,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:16,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388649478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:16,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:16,658 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:16,658 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1903669905] [2021-05-22 02:25:16,658 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:16,658 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:16,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:16,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:16,658 INFO L87 Difference]: Start difference. First operand 427 states and 1324 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:16,790 INFO L93 Difference]: Finished difference Result 680 states and 2039 transitions. [2021-05-22 02:25:16,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:16,790 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:16,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:16,791 INFO L225 Difference]: With dead ends: 680 [2021-05-22 02:25:16,791 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:25:16,791 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 84.2ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:16,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:25:16,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 407. [2021-05-22 02:25:16,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 3.0935960591133007) internal successors, (1256), 406 states have internal predecessors, (1256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 1256 transitions. [2021-05-22 02:25:16,796 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 1256 transitions. Word has length 21 [2021-05-22 02:25:16,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:16,796 INFO L482 AbstractCegarLoop]: Abstraction has 407 states and 1256 transitions. [2021-05-22 02:25:16,797 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:16,797 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 1256 transitions. [2021-05-22 02:25:16,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:16,797 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:16,797 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:16,997 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 338 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1523 [2021-05-22 02:25:16,997 INFO L430 AbstractCegarLoop]: === Iteration 350 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:16,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:16,998 INFO L82 PathProgramCache]: Analyzing trace with hash 2087738507, now seen corresponding path program 338 times [2021-05-22 02:25:16,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:16,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1301886437] [2021-05-22 02:25:16,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:17,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:17,053 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:17,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:17,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1301886437] [2021-05-22 02:25:17,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1301886437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:17,054 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1354577833] [2021-05-22 02:25:17,054 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 339 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 339 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:17,078 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:17,078 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:17,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:17,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:17,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:17,104 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,107 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:17,108 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,108 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:17,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:17,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,123 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:17,123 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:17,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,123 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:17,131 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:17,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1354577833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:17,131 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:17,131 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:17,131 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756279480] [2021-05-22 02:25:17,131 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:17,131 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:17,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:17,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:17,131 INFO L87 Difference]: Start difference. First operand 407 states and 1256 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:17,267 INFO L93 Difference]: Finished difference Result 655 states and 1972 transitions. [2021-05-22 02:25:17,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:17,267 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:17,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:17,268 INFO L225 Difference]: With dead ends: 655 [2021-05-22 02:25:17,268 INFO L226 Difference]: Without dead ends: 636 [2021-05-22 02:25:17,268 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 67.3ms TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:17,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-05-22 02:25:17,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 422. [2021-05-22 02:25:17,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 422 states, 421 states have (on average 3.0997624703087885) internal successors, (1305), 421 states have internal predecessors, (1305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 422 states to 422 states and 1305 transitions. [2021-05-22 02:25:17,273 INFO L78 Accepts]: Start accepts. Automaton has 422 states and 1305 transitions. Word has length 21 [2021-05-22 02:25:17,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:17,273 INFO L482 AbstractCegarLoop]: Abstraction has 422 states and 1305 transitions. [2021-05-22 02:25:17,273 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,273 INFO L276 IsEmpty]: Start isEmpty. Operand 422 states and 1305 transitions. [2021-05-22 02:25:17,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:17,274 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:17,274 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:17,474 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1525,339 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:17,474 INFO L430 AbstractCegarLoop]: === Iteration 351 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:17,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:17,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1822320685, now seen corresponding path program 339 times [2021-05-22 02:25:17,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:17,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678342373] [2021-05-22 02:25:17,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:17,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:17,532 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:17,532 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:17,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678342373] [2021-05-22 02:25:17,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678342373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:17,532 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066879354] [2021-05-22 02:25:17,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 340 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 340 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:17,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:17,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:17,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:17,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:17,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:17,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:17,586 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,586 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:17,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:17,591 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,594 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:17,594 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:17,595 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:17,595 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:17,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:17,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066879354] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:17,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:17,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:17,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344425645] [2021-05-22 02:25:17,606 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:17,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:17,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:17,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:17,607 INFO L87 Difference]: Start difference. First operand 422 states and 1305 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:17,737 INFO L93 Difference]: Finished difference Result 663 states and 1992 transitions. [2021-05-22 02:25:17,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:17,738 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:17,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:17,738 INFO L225 Difference]: With dead ends: 663 [2021-05-22 02:25:17,739 INFO L226 Difference]: Without dead ends: 644 [2021-05-22 02:25:17,739 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 69.4ms TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:17,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-22 02:25:17,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 418. [2021-05-22 02:25:17,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 418 states, 417 states have (on average 3.091127098321343) internal successors, (1289), 417 states have internal predecessors, (1289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 418 states to 418 states and 1289 transitions. [2021-05-22 02:25:17,743 INFO L78 Accepts]: Start accepts. Automaton has 418 states and 1289 transitions. Word has length 21 [2021-05-22 02:25:17,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:17,743 INFO L482 AbstractCegarLoop]: Abstraction has 418 states and 1289 transitions. [2021-05-22 02:25:17,743 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:17,743 INFO L276 IsEmpty]: Start isEmpty. Operand 418 states and 1289 transitions. [2021-05-22 02:25:17,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:17,744 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:17,744 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:17,944 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 340 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1530 [2021-05-22 02:25:17,945 INFO L430 AbstractCegarLoop]: === Iteration 352 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:17,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:17,945 INFO L82 PathProgramCache]: Analyzing trace with hash -326475851, now seen corresponding path program 340 times [2021-05-22 02:25:17,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:17,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267943039] [2021-05-22 02:25:17,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:17,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:18,001 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:18,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:18,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267943039] [2021-05-22 02:25:18,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267943039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:18,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [640461531] [2021-05-22 02:25:18,001 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 341 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 341 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:18,029 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:18,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:18,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:18,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:18,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:18,055 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,059 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:18,059 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,059 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:25:18,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:18,084 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,089 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:18,089 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:18,089 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,089 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:18,105 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:18,105 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [640461531] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:18,105 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:18,105 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:18,105 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459954594] [2021-05-22 02:25:18,105 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:18,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:18,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:18,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:18,106 INFO L87 Difference]: Start difference. First operand 418 states and 1289 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:18,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:18,239 INFO L93 Difference]: Finished difference Result 656 states and 1974 transitions. [2021-05-22 02:25:18,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:18,239 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:18,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:18,240 INFO L225 Difference]: With dead ends: 656 [2021-05-22 02:25:18,240 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:25:18,240 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 78.5ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:18,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:25:18,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 414. [2021-05-22 02:25:18,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 414 states, 413 states have (on average 3.0920096852300243) internal successors, (1277), 413 states have internal predecessors, (1277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:18,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 1277 transitions. [2021-05-22 02:25:18,245 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 1277 transitions. Word has length 21 [2021-05-22 02:25:18,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:18,245 INFO L482 AbstractCegarLoop]: Abstraction has 414 states and 1277 transitions. [2021-05-22 02:25:18,245 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:18,245 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 1277 transitions. [2021-05-22 02:25:18,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:18,245 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:18,245 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:18,446 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 341 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1532 [2021-05-22 02:25:18,446 INFO L430 AbstractCegarLoop]: === Iteration 353 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:18,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:18,446 INFO L82 PathProgramCache]: Analyzing trace with hash 179870415, now seen corresponding path program 341 times [2021-05-22 02:25:18,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:18,447 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834015425] [2021-05-22 02:25:18,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:18,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:18,520 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:18,520 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:18,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834015425] [2021-05-22 02:25:18,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834015425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:18,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [729580347] [2021-05-22 02:25:18,521 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 342 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 342 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:18,551 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:18,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:18,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:18,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:18,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:18,574 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:18,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,577 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:25:18,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:18,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:18,600 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:18,617 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:18,617 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:18,618 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:18,618 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:25:18,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:18,705 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [729580347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:18,705 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:18,705 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:18,705 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563573808] [2021-05-22 02:25:18,705 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:18,705 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:18,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:18,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:18,705 INFO L87 Difference]: Start difference. First operand 414 states and 1277 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:19,060 INFO L93 Difference]: Finished difference Result 754 states and 2260 transitions. [2021-05-22 02:25:19,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:19,061 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:19,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:19,062 INFO L225 Difference]: With dead ends: 754 [2021-05-22 02:25:19,062 INFO L226 Difference]: Without dead ends: 735 [2021-05-22 02:25:19,062 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 259.4ms TimeCoverageRelationStatistics Valid=78, Invalid=264, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:25:19,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735 states. [2021-05-22 02:25:19,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735 to 415. [2021-05-22 02:25:19,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 414 states have (on average 3.111111111111111) internal successors, (1288), 414 states have internal predecessors, (1288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1288 transitions. [2021-05-22 02:25:19,069 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1288 transitions. Word has length 21 [2021-05-22 02:25:19,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:19,069 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1288 transitions. [2021-05-22 02:25:19,069 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,069 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1288 transitions. [2021-05-22 02:25:19,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:19,070 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:19,070 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:19,288 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1534,342 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:19,288 INFO L430 AbstractCegarLoop]: === Iteration 354 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:19,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:19,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1671601621, now seen corresponding path program 342 times [2021-05-22 02:25:19,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:19,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335397306] [2021-05-22 02:25:19,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:19,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:19,363 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:19,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:19,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335397306] [2021-05-22 02:25:19,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335397306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:19,364 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725474559] [2021-05-22 02:25:19,364 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 343 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 343 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:19,395 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:25:19,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:19,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:19,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:19,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:19,428 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:19,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:19,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:19,437 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:19,438 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:19,438 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:19,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:19,453 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:19,456 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:19,456 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:19,456 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:19,456 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:25:19,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:19,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725474559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:19,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:19,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:19,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652239031] [2021-05-22 02:25:19,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:19,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:19,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:19,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:19,466 INFO L87 Difference]: Start difference. First operand 415 states and 1288 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:19,673 INFO L93 Difference]: Finished difference Result 706 states and 2128 transitions. [2021-05-22 02:25:19,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:19,673 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:19,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:19,674 INFO L225 Difference]: With dead ends: 706 [2021-05-22 02:25:19,674 INFO L226 Difference]: Without dead ends: 684 [2021-05-22 02:25:19,675 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 149.6ms TimeCoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:19,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2021-05-22 02:25:19,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 430. [2021-05-22 02:25:19,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.1165501165501164) internal successors, (1337), 429 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1337 transitions. [2021-05-22 02:25:19,681 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1337 transitions. Word has length 21 [2021-05-22 02:25:19,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:19,681 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1337 transitions. [2021-05-22 02:25:19,681 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:19,681 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1337 transitions. [2021-05-22 02:25:19,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:19,682 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:19,682 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:19,896 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1539,343 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:19,896 INFO L430 AbstractCegarLoop]: === Iteration 355 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:19,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:19,896 INFO L82 PathProgramCache]: Analyzing trace with hash -1247529711, now seen corresponding path program 343 times [2021-05-22 02:25:19,896 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:19,896 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609786319] [2021-05-22 02:25:19,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:19,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:19,990 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:19,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:19,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609786319] [2021-05-22 02:25:19,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609786319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:19,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686793287] [2021-05-22 02:25:19,991 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 344 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 344 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:20,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:20,033 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:20,033 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:20,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:20,061 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:20,066 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,066 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:25:20,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:20,096 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:20,098 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:20,101 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:20,101 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:20,102 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:25:20,109 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:20,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686793287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:20,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:20,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:20,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172024673] [2021-05-22 02:25:20,109 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:20,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:20,110 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:20,110 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:20,110 INFO L87 Difference]: Start difference. First operand 430 states and 1337 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:20,329 INFO L93 Difference]: Finished difference Result 719 states and 2166 transitions. [2021-05-22 02:25:20,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:20,329 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:20,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:20,330 INFO L225 Difference]: With dead ends: 719 [2021-05-22 02:25:20,330 INFO L226 Difference]: Without dead ends: 686 [2021-05-22 02:25:20,331 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:20,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 686 states. [2021-05-22 02:25:20,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 686 to 430. [2021-05-22 02:25:20,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.1095571095571097) internal successors, (1334), 429 states have internal predecessors, (1334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1334 transitions. [2021-05-22 02:25:20,337 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1334 transitions. Word has length 21 [2021-05-22 02:25:20,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:20,337 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1334 transitions. [2021-05-22 02:25:20,337 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,338 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1334 transitions. [2021-05-22 02:25:20,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:20,338 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:20,338 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:20,561 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1542,344 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:20,561 INFO L430 AbstractCegarLoop]: === Iteration 356 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:20,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:20,561 INFO L82 PathProgramCache]: Analyzing trace with hash 209151317, now seen corresponding path program 344 times [2021-05-22 02:25:20,561 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:20,561 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841034042] [2021-05-22 02:25:20,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:20,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:20,618 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:20,618 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:20,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841034042] [2021-05-22 02:25:20,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841034042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:20,619 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [252268556] [2021-05-22 02:25:20,619 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 345 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 345 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:20,644 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:20,644 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:20,645 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:20,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:20,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:20,672 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:20,674 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,680 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:20,681 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:20,681 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:20,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:20,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:20,694 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:20,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:20,700 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:20,700 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:20,700 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:20,724 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:20,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [252268556] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:20,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:20,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:20,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500815470] [2021-05-22 02:25:20,724 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:20,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:20,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:20,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:20,724 INFO L87 Difference]: Start difference. First operand 430 states and 1334 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:20,908 INFO L93 Difference]: Finished difference Result 751 states and 2269 transitions. [2021-05-22 02:25:20,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:20,908 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:20,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:20,910 INFO L225 Difference]: With dead ends: 751 [2021-05-22 02:25:20,910 INFO L226 Difference]: Without dead ends: 722 [2021-05-22 02:25:20,910 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 127.7ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:20,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-05-22 02:25:20,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 430. [2021-05-22 02:25:20,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.1095571095571097) internal successors, (1334), 429 states have internal predecessors, (1334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1334 transitions. [2021-05-22 02:25:20,917 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1334 transitions. Word has length 21 [2021-05-22 02:25:20,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:20,917 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1334 transitions. [2021-05-22 02:25:20,917 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:20,917 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1334 transitions. [2021-05-22 02:25:20,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:20,918 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:20,918 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:21,136 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 345 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1548 [2021-05-22 02:25:21,137 INFO L430 AbstractCegarLoop]: === Iteration 357 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:21,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:21,137 INFO L82 PathProgramCache]: Analyzing trace with hash -885547601, now seen corresponding path program 345 times [2021-05-22 02:25:21,137 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:21,137 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154688234] [2021-05-22 02:25:21,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:21,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:21,214 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:21,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:21,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154688234] [2021-05-22 02:25:21,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154688234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:21,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109063833] [2021-05-22 02:25:21,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 346 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 346 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:21,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:21,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:21,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:21,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:21,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:21,307 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:21,312 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:21,313 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:21,313 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:27, output treesize:20 [2021-05-22 02:25:21,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:21,325 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:21,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:21,327 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:21,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:21,350 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:21,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:21,350 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:25:21,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:21,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109063833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:21,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:21,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:25:21,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48897992] [2021-05-22 02:25:21,370 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:25:21,370 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:21,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:25:21,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:25:21,370 INFO L87 Difference]: Start difference. First operand 430 states and 1334 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:21,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:21,646 INFO L93 Difference]: Finished difference Result 714 states and 2150 transitions. [2021-05-22 02:25:21,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:21,647 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:21,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:21,648 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:25:21,648 INFO L226 Difference]: Without dead ends: 687 [2021-05-22 02:25:21,648 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 152.2ms TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:21,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-05-22 02:25:21,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 428. [2021-05-22 02:25:21,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 3.11943793911007) internal successors, (1332), 427 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:21,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 1332 transitions. [2021-05-22 02:25:21,655 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 1332 transitions. Word has length 21 [2021-05-22 02:25:21,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:21,655 INFO L482 AbstractCegarLoop]: Abstraction has 428 states and 1332 transitions. [2021-05-22 02:25:21,655 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:21,655 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 1332 transitions. [2021-05-22 02:25:21,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:21,656 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:21,656 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:21,874 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 346 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1552 [2021-05-22 02:25:21,874 INFO L430 AbstractCegarLoop]: === Iteration 358 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:21,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:21,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1979031859, now seen corresponding path program 346 times [2021-05-22 02:25:21,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:21,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281803261] [2021-05-22 02:25:21,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:21,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:21,951 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:21,952 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:21,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281803261] [2021-05-22 02:25:21,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281803261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:21,952 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1102406634] [2021-05-22 02:25:21,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 347 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 347 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:21,982 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:21,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:21,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:21,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:22,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:22,024 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:22,028 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,028 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:25:22,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:25:22,049 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:25:22,051 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,057 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:22,057 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:22,057 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:22,057 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:22,081 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:22,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1102406634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:22,081 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:22,081 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:22,081 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232756843] [2021-05-22 02:25:22,081 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:22,082 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:22,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:22,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:22,082 INFO L87 Difference]: Start difference. First operand 428 states and 1332 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:22,261 INFO L93 Difference]: Finished difference Result 724 states and 2184 transitions. [2021-05-22 02:25:22,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:22,261 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:22,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:22,262 INFO L225 Difference]: With dead ends: 724 [2021-05-22 02:25:22,262 INFO L226 Difference]: Without dead ends: 688 [2021-05-22 02:25:22,262 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 145.8ms TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:22,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-22 02:25:22,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 429. [2021-05-22 02:25:22,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 3.1238317757009346) internal successors, (1337), 428 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 1337 transitions. [2021-05-22 02:25:22,267 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 1337 transitions. Word has length 21 [2021-05-22 02:25:22,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:22,267 INFO L482 AbstractCegarLoop]: Abstraction has 429 states and 1337 transitions. [2021-05-22 02:25:22,267 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,267 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 1337 transitions. [2021-05-22 02:25:22,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:22,268 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:22,268 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:22,468 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 347 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1556 [2021-05-22 02:25:22,469 INFO L430 AbstractCegarLoop]: === Iteration 359 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:22,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:22,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1221236519, now seen corresponding path program 347 times [2021-05-22 02:25:22,469 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:22,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454340211] [2021-05-22 02:25:22,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:22,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:22,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:22,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:22,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454340211] [2021-05-22 02:25:22,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454340211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:22,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978723110] [2021-05-22 02:25:22,550 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 348 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 348 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:22,582 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:22,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:22,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:22,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:22,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:22,616 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:22,618 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:22,626 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:22,626 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:22,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:22,653 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,661 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:22,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:22,664 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:22,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:22,671 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:22,671 INFO L518 ElimStorePlain]: Eliminatee v_prenex_55 vanished before elimination [2021-05-22 02:25:22,672 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:22,672 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:25:22,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:22,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978723110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:22,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:22,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:22,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264126968] [2021-05-22 02:25:22,707 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:22,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:22,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:22,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:22,707 INFO L87 Difference]: Start difference. First operand 429 states and 1337 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:22,940 INFO L93 Difference]: Finished difference Result 765 states and 2299 transitions. [2021-05-22 02:25:22,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:22,941 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:22,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:22,942 INFO L225 Difference]: With dead ends: 765 [2021-05-22 02:25:22,942 INFO L226 Difference]: Without dead ends: 738 [2021-05-22 02:25:22,942 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 166.6ms TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:22,943 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2021-05-22 02:25:22,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 448. [2021-05-22 02:25:22,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.1387024608501117) internal successors, (1403), 447 states have internal predecessors, (1403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1403 transitions. [2021-05-22 02:25:22,950 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1403 transitions. Word has length 21 [2021-05-22 02:25:22,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:22,950 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1403 transitions. [2021-05-22 02:25:22,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:22,950 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1403 transitions. [2021-05-22 02:25:22,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:22,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:22,951 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:23,172 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1559,348 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:23,172 INFO L430 AbstractCegarLoop]: === Iteration 360 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:23,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:23,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1192977839, now seen corresponding path program 348 times [2021-05-22 02:25:23,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:23,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802986854] [2021-05-22 02:25:23,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:23,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:23,258 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:23,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:23,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802986854] [2021-05-22 02:25:23,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [802986854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:23,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278375079] [2021-05-22 02:25:23,258 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 349 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 349 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:23,290 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:23,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:23,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:23,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:23,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:23,325 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:23,327 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:23,335 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:23,335 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:23,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:23,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:23,375 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:23,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,375 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:23,388 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:23,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278375079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:23,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:23,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:23,388 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103834763] [2021-05-22 02:25:23,388 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:23,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:23,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:23,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:23,389 INFO L87 Difference]: Start difference. First operand 448 states and 1403 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:23,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:23,609 INFO L93 Difference]: Finished difference Result 724 states and 2178 transitions. [2021-05-22 02:25:23,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:23,610 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:23,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:23,611 INFO L225 Difference]: With dead ends: 724 [2021-05-22 02:25:23,611 INFO L226 Difference]: Without dead ends: 703 [2021-05-22 02:25:23,611 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 164.0ms TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:23,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-22 02:25:23,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 426. [2021-05-22 02:25:23,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 426 states, 425 states have (on average 3.1270588235294117) internal successors, (1329), 425 states have internal predecessors, (1329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:23,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 426 states to 426 states and 1329 transitions. [2021-05-22 02:25:23,619 INFO L78 Accepts]: Start accepts. Automaton has 426 states and 1329 transitions. Word has length 21 [2021-05-22 02:25:23,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:23,619 INFO L482 AbstractCegarLoop]: Abstraction has 426 states and 1329 transitions. [2021-05-22 02:25:23,620 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:23,620 INFO L276 IsEmpty]: Start isEmpty. Operand 426 states and 1329 transitions. [2021-05-22 02:25:23,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:23,620 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:23,620 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:23,835 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1565,349 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:23,835 INFO L430 AbstractCegarLoop]: === Iteration 361 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:23,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:23,835 INFO L82 PathProgramCache]: Analyzing trace with hash 832800499, now seen corresponding path program 349 times [2021-05-22 02:25:23,835 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:23,835 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163306805] [2021-05-22 02:25:23,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:23,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:23,914 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:23,914 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:23,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163306805] [2021-05-22 02:25:23,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163306805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:23,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1555643419] [2021-05-22 02:25:23,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 350 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 350 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:23,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:23,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:23,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:23,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:23,967 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,970 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:23,970 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,971 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:25:23,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:25:23,996 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:23,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:25:23,999 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:24,005 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:24,005 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:24,006 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:24,006 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:25:24,034 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:24,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1555643419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:24,034 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:24,034 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:24,034 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422904941] [2021-05-22 02:25:24,034 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:24,034 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:24,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:24,035 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:24,035 INFO L87 Difference]: Start difference. First operand 426 states and 1329 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:24,272 INFO L93 Difference]: Finished difference Result 846 states and 2548 transitions. [2021-05-22 02:25:24,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:24,272 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:24,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:24,273 INFO L225 Difference]: With dead ends: 846 [2021-05-22 02:25:24,273 INFO L226 Difference]: Without dead ends: 799 [2021-05-22 02:25:24,273 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 157.3ms TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:24,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-05-22 02:25:24,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 429. [2021-05-22 02:25:24,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 3.1401869158878504) internal successors, (1344), 428 states have internal predecessors, (1344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 1344 transitions. [2021-05-22 02:25:24,279 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 1344 transitions. Word has length 21 [2021-05-22 02:25:24,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:24,279 INFO L482 AbstractCegarLoop]: Abstraction has 429 states and 1344 transitions. [2021-05-22 02:25:24,279 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,280 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 1344 transitions. [2021-05-22 02:25:24,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:24,280 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:24,280 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:24,480 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 350 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1568 [2021-05-22 02:25:24,480 INFO L430 AbstractCegarLoop]: === Iteration 362 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:24,481 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:24,481 INFO L82 PathProgramCache]: Analyzing trace with hash -261898419, now seen corresponding path program 350 times [2021-05-22 02:25:24,481 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:24,481 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977024934] [2021-05-22 02:25:24,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:24,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:24,538 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:24,538 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:24,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977024934] [2021-05-22 02:25:24,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977024934] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:24,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999103792] [2021-05-22 02:25:24,538 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 351 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 351 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:24,563 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:24,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:24,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:24,564 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:24,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:24,587 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:24,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:24,589 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:24,597 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:24,598 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:24,598 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:25:24,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:24,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:24,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:24,619 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:24,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:24,625 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:24,625 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:24,625 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:25:24,653 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:24,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999103792] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:24,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:24,654 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:24,654 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814529237] [2021-05-22 02:25:24,654 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:24,654 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:24,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:24,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:24,654 INFO L87 Difference]: Start difference. First operand 429 states and 1344 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:24,902 INFO L93 Difference]: Finished difference Result 909 states and 2741 transitions. [2021-05-22 02:25:24,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:24,902 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:24,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:24,903 INFO L225 Difference]: With dead ends: 909 [2021-05-22 02:25:24,903 INFO L226 Difference]: Without dead ends: 882 [2021-05-22 02:25:24,903 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 160.7ms TimeCoverageRelationStatistics Valid=80, Invalid=262, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:25:24,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 882 states. [2021-05-22 02:25:24,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 882 to 460. [2021-05-22 02:25:24,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.161220043572985) internal successors, (1451), 459 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1451 transitions. [2021-05-22 02:25:24,909 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1451 transitions. Word has length 21 [2021-05-22 02:25:24,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:24,909 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1451 transitions. [2021-05-22 02:25:24,910 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:24,910 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1451 transitions. [2021-05-22 02:25:24,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:24,910 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:24,910 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:25,110 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1571,351 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:25,111 INFO L430 AbstractCegarLoop]: === Iteration 363 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:25,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:25,111 INFO L82 PathProgramCache]: Analyzing trace with hash 1618854519, now seen corresponding path program 351 times [2021-05-22 02:25:25,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:25,111 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447901850] [2021-05-22 02:25:25,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:25,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:25,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:25,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:25,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447901850] [2021-05-22 02:25:25,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447901850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:25,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [572395703] [2021-05-22 02:25:25,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 352 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 352 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:25,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:25,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:25,215 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:25,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:25,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:25,238 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:25,239 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,242 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:25,242 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:25,242 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:25:25,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:25,270 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,272 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:25,273 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:25,273 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,273 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:25,283 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:25,283 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [572395703] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:25,283 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:25,283 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:25,283 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725217789] [2021-05-22 02:25:25,283 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:25,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:25,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:25,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:25,283 INFO L87 Difference]: Start difference. First operand 460 states and 1451 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:25,453 INFO L93 Difference]: Finished difference Result 893 states and 2700 transitions. [2021-05-22 02:25:25,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:25,453 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:25,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:25,455 INFO L225 Difference]: With dead ends: 893 [2021-05-22 02:25:25,455 INFO L226 Difference]: Without dead ends: 872 [2021-05-22 02:25:25,455 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:25,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 872 states. [2021-05-22 02:25:25,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 872 to 456. [2021-05-22 02:25:25,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1604395604395603) internal successors, (1438), 455 states have internal predecessors, (1438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1438 transitions. [2021-05-22 02:25:25,461 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1438 transitions. Word has length 21 [2021-05-22 02:25:25,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:25,461 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1438 transitions. [2021-05-22 02:25:25,461 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,461 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1438 transitions. [2021-05-22 02:25:25,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:25,461 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:25,461 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:25,662 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1578,352 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:25,662 INFO L430 AbstractCegarLoop]: === Iteration 364 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:25,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:25,662 INFO L82 PathProgramCache]: Analyzing trace with hash 2125200785, now seen corresponding path program 352 times [2021-05-22 02:25:25,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:25,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913584639] [2021-05-22 02:25:25,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:25,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:25,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:25,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:25,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913584639] [2021-05-22 02:25:25,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913584639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:25,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361804780] [2021-05-22 02:25:25,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 353 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 353 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:25,740 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:25,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:25,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:25,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:25,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:25,764 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:25,765 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,768 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:25,768 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:25,768 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:25:25,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:25,784 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,786 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:25,787 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:25,787 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:25,787 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:25,796 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:25,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361804780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:25,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:25,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:25:25,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521576914] [2021-05-22 02:25:25,797 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:25:25,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:25,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:25:25,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:25:25,797 INFO L87 Difference]: Start difference. First operand 456 states and 1438 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,954 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:25,954 INFO L93 Difference]: Finished difference Result 941 states and 2818 transitions. [2021-05-22 02:25:25,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:25,957 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:25,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:25,959 INFO L225 Difference]: With dead ends: 941 [2021-05-22 02:25:25,959 INFO L226 Difference]: Without dead ends: 920 [2021-05-22 02:25:25,959 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 97.2ms TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:25,960 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 920 states. [2021-05-22 02:25:25,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 920 to 440. [2021-05-22 02:25:25,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 439 states have (on average 3.143507972665148) internal successors, (1380), 439 states have internal predecessors, (1380), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 1380 transitions. [2021-05-22 02:25:25,965 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 1380 transitions. Word has length 21 [2021-05-22 02:25:25,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:25,965 INFO L482 AbstractCegarLoop]: Abstraction has 440 states and 1380 transitions. [2021-05-22 02:25:25,965 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:25,965 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 1380 transitions. [2021-05-22 02:25:25,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:25,965 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:25,965 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:26,165 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1581,353 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:26,166 INFO L430 AbstractCegarLoop]: === Iteration 365 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:26,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:26,166 INFO L82 PathProgramCache]: Analyzing trace with hash 1380365547, now seen corresponding path program 353 times [2021-05-22 02:25:26,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:26,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [677070336] [2021-05-22 02:25:26,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:26,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:26,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:26,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:26,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [677070336] [2021-05-22 02:25:26,247 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [677070336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:26,247 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215465243] [2021-05-22 02:25:26,252 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 354 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 354 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:26,279 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:26,279 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:26,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:26,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:26,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:26,332 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:26,335 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:26,338 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:26,341 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:26,367 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:25:26,367 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:101, output treesize:69 [2021-05-22 02:25:26,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:25:26,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:26,470 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:26,479 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:26,479 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:26,479 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:26,479 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:25:26,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:26,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215465243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:26,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:26,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:26,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1231431407] [2021-05-22 02:25:26,525 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:26,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:26,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:26,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:26,525 INFO L87 Difference]: Start difference. First operand 440 states and 1380 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:27,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:27,184 INFO L93 Difference]: Finished difference Result 789 states and 2407 transitions. [2021-05-22 02:25:27,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:25:27,184 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:27,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:27,185 INFO L225 Difference]: With dead ends: 789 [2021-05-22 02:25:27,185 INFO L226 Difference]: Without dead ends: 751 [2021-05-22 02:25:27,185 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 641.4ms TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:25:27,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-22 02:25:27,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 452. [2021-05-22 02:25:27,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.1596452328159645) internal successors, (1425), 451 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:27,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1425 transitions. [2021-05-22 02:25:27,191 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1425 transitions. Word has length 21 [2021-05-22 02:25:27,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:27,191 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1425 transitions. [2021-05-22 02:25:27,191 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:27,191 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1425 transitions. [2021-05-22 02:25:27,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:27,192 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:27,192 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:27,392 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 354 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1584 [2021-05-22 02:25:27,392 INFO L430 AbstractCegarLoop]: === Iteration 366 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:27,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:27,392 INFO L82 PathProgramCache]: Analyzing trace with hash -1228209909, now seen corresponding path program 354 times [2021-05-22 02:25:27,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:27,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62247021] [2021-05-22 02:25:27,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:27,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:27,473 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:27,473 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:27,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62247021] [2021-05-22 02:25:27,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62247021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:27,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799856145] [2021-05-22 02:25:27,473 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 355 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 355 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:27,499 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:27,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:27,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:27,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:27,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:27,557 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:27,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:27,559 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:27,573 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:27,574 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:27,574 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:27,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:27,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:27,630 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:27,631 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:27,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:27,633 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:27,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:27,639 INFO L518 ElimStorePlain]: Eliminatee v_prenex_56 vanished before elimination [2021-05-22 02:25:27,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:27,639 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:25:27,684 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:27,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1799856145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:27,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:27,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:27,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810580211] [2021-05-22 02:25:27,685 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:27,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:27,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:27,685 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:27,685 INFO L87 Difference]: Start difference. First operand 452 states and 1425 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:28,032 INFO L93 Difference]: Finished difference Result 816 states and 2492 transitions. [2021-05-22 02:25:28,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:28,033 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:28,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:28,034 INFO L225 Difference]: With dead ends: 816 [2021-05-22 02:25:28,034 INFO L226 Difference]: Without dead ends: 793 [2021-05-22 02:25:28,034 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 291.1ms TimeCoverageRelationStatistics Valid=110, Invalid=490, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:28,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 793 states. [2021-05-22 02:25:28,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 793 to 456. [2021-05-22 02:25:28,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.158241758241758) internal successors, (1437), 455 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1437 transitions. [2021-05-22 02:25:28,040 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1437 transitions. Word has length 21 [2021-05-22 02:25:28,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:28,040 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1437 transitions. [2021-05-22 02:25:28,040 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,040 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1437 transitions. [2021-05-22 02:25:28,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:28,040 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:28,040 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:28,241 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1593,355 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:28,241 INFO L430 AbstractCegarLoop]: === Iteration 367 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:28,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:28,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1068629005, now seen corresponding path program 355 times [2021-05-22 02:25:28,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:28,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [55249280] [2021-05-22 02:25:28,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:28,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:28,327 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:28,327 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:28,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [55249280] [2021-05-22 02:25:28,327 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [55249280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:28,327 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [93396034] [2021-05-22 02:25:28,327 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 356 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 356 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:28,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:28,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:28,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:28,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:28,402 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:28,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:28,404 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:28,413 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:28,413 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:28,413 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:28,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:28,452 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:28,455 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:28,455 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:28,455 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:28,455 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:28,496 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:28,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [93396034] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:28,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:28,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:28,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1602413429] [2021-05-22 02:25:28,496 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:28,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:28,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:28,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:28,496 INFO L87 Difference]: Start difference. First operand 456 states and 1437 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:28,800 INFO L93 Difference]: Finished difference Result 733 states and 2254 transitions. [2021-05-22 02:25:28,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:25:28,801 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:28,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:28,802 INFO L225 Difference]: With dead ends: 733 [2021-05-22 02:25:28,802 INFO L226 Difference]: Without dead ends: 714 [2021-05-22 02:25:28,802 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 267.6ms TimeCoverageRelationStatistics Valid=114, Invalid=486, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-05-22 02:25:28,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 452. [2021-05-22 02:25:28,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.1507760532150777) internal successors, (1421), 451 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1421 transitions. [2021-05-22 02:25:28,807 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1421 transitions. Word has length 21 [2021-05-22 02:25:28,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:28,807 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1421 transitions. [2021-05-22 02:25:28,807 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:28,808 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1421 transitions. [2021-05-22 02:25:28,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:28,808 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:28,808 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:29,008 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1602,356 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:29,009 INFO L430 AbstractCegarLoop]: === Iteration 368 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:29,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:29,009 INFO L82 PathProgramCache]: Analyzing trace with hash -2082051155, now seen corresponding path program 356 times [2021-05-22 02:25:29,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:29,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94386161] [2021-05-22 02:25:29,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:29,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:29,090 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:29,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:29,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94386161] [2021-05-22 02:25:29,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94386161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:29,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724195180] [2021-05-22 02:25:29,090 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 357 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 357 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:29,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:29,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:29,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:29,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:29,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:29,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:29,167 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:29,176 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:29,176 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:29,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:29,202 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:29,211 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:29,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:29,214 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:29,222 INFO L518 ElimStorePlain]: Eliminatee v_prenex_59 vanished before elimination [2021-05-22 02:25:29,222 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:29,222 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:25:29,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:29,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724195180] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:29,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:29,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:29,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001646669] [2021-05-22 02:25:29,245 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:29,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:29,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:29,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:29,245 INFO L87 Difference]: Start difference. First operand 452 states and 1421 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:29,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:29,450 INFO L93 Difference]: Finished difference Result 702 states and 2145 transitions. [2021-05-22 02:25:29,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:29,450 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:29,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:29,451 INFO L225 Difference]: With dead ends: 702 [2021-05-22 02:25:29,451 INFO L226 Difference]: Without dead ends: 679 [2021-05-22 02:25:29,452 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 185.2ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:29,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-22 02:25:29,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 454. [2021-05-22 02:25:29,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1589403973509933) internal successors, (1431), 453 states have internal predecessors, (1431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:29,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1431 transitions. [2021-05-22 02:25:29,459 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1431 transitions. Word has length 21 [2021-05-22 02:25:29,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:29,459 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1431 transitions. [2021-05-22 02:25:29,459 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:29,459 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1431 transitions. [2021-05-22 02:25:29,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:29,460 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:29,460 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:29,660 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1606,357 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:29,660 INFO L430 AbstractCegarLoop]: === Iteration 369 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:29,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:29,660 INFO L82 PathProgramCache]: Analyzing trace with hash 504543133, now seen corresponding path program 357 times [2021-05-22 02:25:29,660 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:29,661 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248587271] [2021-05-22 02:25:29,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:29,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:29,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:29,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:29,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248587271] [2021-05-22 02:25:29,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1248587271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:29,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1501082896] [2021-05-22 02:25:29,743 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 358 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 358 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:29,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:29,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:29,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:29,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:29,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:29,831 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:29,835 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,835 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:29,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:29,869 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,872 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:29,872 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:29,872 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:29,872 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:29,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:29,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1501082896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:29,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:29,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:29,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465045692] [2021-05-22 02:25:29,899 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:29,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:29,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:29,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:29,900 INFO L87 Difference]: Start difference. First operand 454 states and 1431 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:30,207 INFO L93 Difference]: Finished difference Result 725 states and 2231 transitions. [2021-05-22 02:25:30,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:25:30,208 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:30,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:30,209 INFO L225 Difference]: With dead ends: 725 [2021-05-22 02:25:30,209 INFO L226 Difference]: Without dead ends: 706 [2021-05-22 02:25:30,209 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 247.3ms TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:30,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-05-22 02:25:30,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 462. [2021-05-22 02:25:30,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1648590021691976) internal successors, (1459), 461 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1459 transitions. [2021-05-22 02:25:30,214 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1459 transitions. Word has length 21 [2021-05-22 02:25:30,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:30,214 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1459 transitions. [2021-05-22 02:25:30,214 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,214 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1459 transitions. [2021-05-22 02:25:30,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:30,215 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:30,215 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:30,415 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1613,358 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:30,415 INFO L430 AbstractCegarLoop]: === Iteration 370 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:30,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:30,415 INFO L82 PathProgramCache]: Analyzing trace with hash -1529093347, now seen corresponding path program 358 times [2021-05-22 02:25:30,415 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:30,415 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450737379] [2021-05-22 02:25:30,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:30,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:30,500 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:30,500 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:30,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450737379] [2021-05-22 02:25:30,500 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450737379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:30,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439853106] [2021-05-22 02:25:30,500 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 359 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 359 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:30,526 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:30,526 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:30,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:30,532 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:30,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:30,593 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:30,596 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:30,597 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:30,597 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:30,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:30,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:30,620 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:30,621 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:30,621 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:30,621 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:30,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:30,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439853106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:30,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:30,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:30,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1259531444] [2021-05-22 02:25:30,663 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:30,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:30,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:30,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:30,663 INFO L87 Difference]: Start difference. First operand 462 states and 1459 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:30,969 INFO L93 Difference]: Finished difference Result 717 states and 2211 transitions. [2021-05-22 02:25:30,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:25:30,969 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:30,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:30,970 INFO L225 Difference]: With dead ends: 717 [2021-05-22 02:25:30,970 INFO L226 Difference]: Without dead ends: 698 [2021-05-22 02:25:30,970 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 257.3ms TimeCoverageRelationStatistics Valid=122, Invalid=478, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:30,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-22 02:25:30,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 458. [2021-05-22 02:25:30,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1575492341356672) internal successors, (1443), 457 states have internal predecessors, (1443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1443 transitions. [2021-05-22 02:25:30,975 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1443 transitions. Word has length 21 [2021-05-22 02:25:30,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:30,975 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1443 transitions. [2021-05-22 02:25:30,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:30,975 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1443 transitions. [2021-05-22 02:25:30,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:30,976 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:30,976 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:31,176 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 359 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1616 [2021-05-22 02:25:31,176 INFO L430 AbstractCegarLoop]: === Iteration 371 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:31,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:31,177 INFO L82 PathProgramCache]: Analyzing trace with hash -910831179, now seen corresponding path program 359 times [2021-05-22 02:25:31,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:31,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766221484] [2021-05-22 02:25:31,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:31,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:31,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:31,266 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:31,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766221484] [2021-05-22 02:25:31,266 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766221484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:31,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47871906] [2021-05-22 02:25:31,266 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 360 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 360 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:31,292 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:31,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:31,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:31,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:31,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:31,347 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:31,351 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:31,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:31,351 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:31,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:31,368 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:31,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:31,371 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:31,387 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:31,387 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:31,387 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:31,387 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:25:31,458 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:31,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47871906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:31,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:31,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:31,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792029890] [2021-05-22 02:25:31,459 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:31,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:31,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:31,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:31,459 INFO L87 Difference]: Start difference. First operand 458 states and 1443 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:31,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:31,685 INFO L93 Difference]: Finished difference Result 635 states and 1962 transitions. [2021-05-22 02:25:31,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:31,685 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:31,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:31,686 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:25:31,686 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:25:31,686 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 233.9ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:25:31,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:25:31,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 454. [2021-05-22 02:25:31,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1589403973509933) internal successors, (1431), 453 states have internal predecessors, (1431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:31,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1431 transitions. [2021-05-22 02:25:31,691 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1431 transitions. Word has length 21 [2021-05-22 02:25:31,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:31,691 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1431 transitions. [2021-05-22 02:25:31,692 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:31,692 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1431 transitions. [2021-05-22 02:25:31,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:31,692 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:31,692 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:31,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1619,360 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:31,893 INFO L430 AbstractCegarLoop]: === Iteration 372 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:31,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:31,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1233428683, now seen corresponding path program 360 times [2021-05-22 02:25:31,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:31,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789087031] [2021-05-22 02:25:31,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:31,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:31,966 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:31,966 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:31,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789087031] [2021-05-22 02:25:31,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1789087031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:31,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389917706] [2021-05-22 02:25:31,967 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 361 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 361 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:31,993 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:31,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:31,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:31,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:32,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:32,049 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:32,051 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,060 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:32,060 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:32,060 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:32,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:32,086 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,096 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:32,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:32,098 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,106 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:32,107 INFO L518 ElimStorePlain]: Eliminatee v_prenex_60 vanished before elimination [2021-05-22 02:25:32,107 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:32,107 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:32,107 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:25:32,129 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:32,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [389917706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:32,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:32,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:32,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244080035] [2021-05-22 02:25:32,130 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:32,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:32,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:32,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:32,130 INFO L87 Difference]: Start difference. First operand 454 states and 1431 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:32,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:32,314 INFO L93 Difference]: Finished difference Result 708 states and 2171 transitions. [2021-05-22 02:25:32,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:32,315 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:32,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:32,316 INFO L225 Difference]: With dead ends: 708 [2021-05-22 02:25:32,316 INFO L226 Difference]: Without dead ends: 685 [2021-05-22 02:25:32,316 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 164.3ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:32,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2021-05-22 02:25:32,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 460. [2021-05-22 02:25:32,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1655773420479303) internal successors, (1453), 459 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:32,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1453 transitions. [2021-05-22 02:25:32,321 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1453 transitions. Word has length 21 [2021-05-22 02:25:32,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:32,321 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1453 transitions. [2021-05-22 02:25:32,321 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:32,321 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1453 transitions. [2021-05-22 02:25:32,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:32,322 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:32,322 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:32,522 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 361 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1625 [2021-05-22 02:25:32,522 INFO L430 AbstractCegarLoop]: === Iteration 373 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:32,522 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:32,522 INFO L82 PathProgramCache]: Analyzing trace with hash 816528963, now seen corresponding path program 361 times [2021-05-22 02:25:32,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:32,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [687527848] [2021-05-22 02:25:32,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:32,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:32,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:32,605 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:32,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [687527848] [2021-05-22 02:25:32,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [687527848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:32,605 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1256281865] [2021-05-22 02:25:32,605 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 362 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 362 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:32,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:32,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:32,631 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:32,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:32,672 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:32,674 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,682 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:32,683 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:32,683 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:25:32,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:32,717 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,720 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:32,720 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:32,721 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:32,721 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:32,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:32,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1256281865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:32,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:32,763 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:25:32,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344860490] [2021-05-22 02:25:32,763 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:25:32,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:32,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:25:32,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:32,764 INFO L87 Difference]: Start difference. First operand 460 states and 1453 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:33,077 INFO L93 Difference]: Finished difference Result 719 states and 2211 transitions. [2021-05-22 02:25:33,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:25:33,077 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:33,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:33,078 INFO L225 Difference]: With dead ends: 719 [2021-05-22 02:25:33,078 INFO L226 Difference]: Without dead ends: 700 [2021-05-22 02:25:33,078 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 227.7ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:33,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-05-22 02:25:33,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 456. [2021-05-22 02:25:33,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1626373626373625) internal successors, (1439), 455 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1439 transitions. [2021-05-22 02:25:33,084 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1439 transitions. Word has length 21 [2021-05-22 02:25:33,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:33,084 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1439 transitions. [2021-05-22 02:25:33,084 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,084 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1439 transitions. [2021-05-22 02:25:33,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:33,084 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:33,084 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:33,285 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1632,362 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:33,285 INFO L430 AbstractCegarLoop]: === Iteration 374 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:33,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:33,285 INFO L82 PathProgramCache]: Analyzing trace with hash -702328017, now seen corresponding path program 362 times [2021-05-22 02:25:33,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:33,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612445662] [2021-05-22 02:25:33,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:33,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:33,359 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:33,359 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:33,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612445662] [2021-05-22 02:25:33,359 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612445662] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:33,359 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92457052] [2021-05-22 02:25:33,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 363 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 363 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:33,385 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:33,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:33,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:33,386 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:33,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:33,437 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:33,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:33,441 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:33,441 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:33,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:33,480 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:33,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:33,483 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:33,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:33,483 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:25:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:33,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92457052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:33,508 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:33,508 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:33,508 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710403504] [2021-05-22 02:25:33,508 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:33,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:33,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:33,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:33,509 INFO L87 Difference]: Start difference. First operand 456 states and 1439 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:33,827 INFO L93 Difference]: Finished difference Result 761 states and 2336 transitions. [2021-05-22 02:25:33,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:33,827 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:33,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:33,828 INFO L225 Difference]: With dead ends: 761 [2021-05-22 02:25:33,828 INFO L226 Difference]: Without dead ends: 742 [2021-05-22 02:25:33,829 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 244.2ms TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:25:33,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-22 02:25:33,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 465. [2021-05-22 02:25:33,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1551724137931036) internal successors, (1464), 464 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1464 transitions. [2021-05-22 02:25:33,834 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1464 transitions. Word has length 21 [2021-05-22 02:25:33,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:33,834 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1464 transitions. [2021-05-22 02:25:33,834 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:33,834 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1464 transitions. [2021-05-22 02:25:33,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:33,835 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:33,835 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:34,035 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1636,363 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:34,036 INFO L430 AbstractCegarLoop]: === Iteration 375 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:34,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:34,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1559002799, now seen corresponding path program 363 times [2021-05-22 02:25:34,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:34,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782286232] [2021-05-22 02:25:34,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:34,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:34,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:34,104 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:34,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782286232] [2021-05-22 02:25:34,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782286232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:34,104 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515172746] [2021-05-22 02:25:34,104 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 364 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 364 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:34,130 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:34,130 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:34,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:34,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:34,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:34,180 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,183 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:34,184 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,184 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:34,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:34,203 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,207 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:34,207 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:34,207 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,207 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:34,219 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:34,219 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515172746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:34,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:34,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:34,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132330736] [2021-05-22 02:25:34,219 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:34,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:34,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:34,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:34,220 INFO L87 Difference]: Start difference. First operand 465 states and 1464 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:34,364 INFO L93 Difference]: Finished difference Result 652 states and 2015 transitions. [2021-05-22 02:25:34,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:34,364 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:34,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:34,365 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:25:34,365 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:25:34,365 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 114.6ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:34,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:25:34,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 461. [2021-05-22 02:25:34,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.1478260869565218) internal successors, (1448), 460 states have internal predecessors, (1448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1448 transitions. [2021-05-22 02:25:34,371 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1448 transitions. Word has length 21 [2021-05-22 02:25:34,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:34,371 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1448 transitions. [2021-05-22 02:25:34,371 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,371 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1448 transitions. [2021-05-22 02:25:34,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:34,372 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:34,372 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:34,574 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 364 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1639 [2021-05-22 02:25:34,575 INFO L430 AbstractCegarLoop]: === Iteration 376 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:34,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:34,575 INFO L82 PathProgramCache]: Analyzing trace with hash -2117702329, now seen corresponding path program 364 times [2021-05-22 02:25:34,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:34,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [142798632] [2021-05-22 02:25:34,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:34,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:34,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:34,642 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:34,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [142798632] [2021-05-22 02:25:34,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [142798632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:34,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1965171616] [2021-05-22 02:25:34,642 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 365 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 365 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:34,668 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:34,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:34,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:34,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:34,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:34,710 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:34,714 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,714 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:25:34,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:34,730 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,733 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:34,733 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:34,733 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:34,733 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:34,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:34,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1965171616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:34,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:34,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:34,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070354718] [2021-05-22 02:25:34,745 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:34,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:34,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:34,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:34,746 INFO L87 Difference]: Start difference. First operand 461 states and 1448 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:34,879 INFO L93 Difference]: Finished difference Result 650 states and 1995 transitions. [2021-05-22 02:25:34,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:34,879 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:34,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:34,880 INFO L225 Difference]: With dead ends: 650 [2021-05-22 02:25:34,880 INFO L226 Difference]: Without dead ends: 631 [2021-05-22 02:25:34,880 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 104.1ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:34,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-05-22 02:25:34,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 445. [2021-05-22 02:25:34,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 444 states have (on average 3.135135135135135) internal successors, (1392), 444 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 1392 transitions. [2021-05-22 02:25:34,885 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 1392 transitions. Word has length 21 [2021-05-22 02:25:34,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:34,885 INFO L482 AbstractCegarLoop]: Abstraction has 445 states and 1392 transitions. [2021-05-22 02:25:34,885 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:34,886 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 1392 transitions. [2021-05-22 02:25:34,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:34,886 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:34,886 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:35,086 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1642,365 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:35,087 INFO L430 AbstractCegarLoop]: === Iteration 377 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:35,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:35,087 INFO L82 PathProgramCache]: Analyzing trace with hash -440489425, now seen corresponding path program 365 times [2021-05-22 02:25:35,087 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:35,087 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449391365] [2021-05-22 02:25:35,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:35,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:35,153 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:35,154 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:35,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449391365] [2021-05-22 02:25:35,154 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449391365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:35,154 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187876164] [2021-05-22 02:25:35,154 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 366 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 366 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:35,179 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:35,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:35,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:35,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:35,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:35,199 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,202 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:35,202 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,203 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:25:35,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:35,215 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:35,217 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:35,233 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:35,233 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:35,233 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:25:35,297 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:35,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187876164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:35,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:35,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:35,298 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1769396386] [2021-05-22 02:25:35,298 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:35,298 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:35,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:35,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:35,298 INFO L87 Difference]: Start difference. First operand 445 states and 1392 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:35,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:35,553 INFO L93 Difference]: Finished difference Result 766 states and 2338 transitions. [2021-05-22 02:25:35,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:35,553 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:35,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:35,554 INFO L225 Difference]: With dead ends: 766 [2021-05-22 02:25:35,554 INFO L226 Difference]: Without dead ends: 747 [2021-05-22 02:25:35,554 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 215.0ms TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:35,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 747 states. [2021-05-22 02:25:35,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 747 to 438. [2021-05-22 02:25:35,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 438 states, 437 states have (on average 3.137299771167048) internal successors, (1371), 437 states have internal predecessors, (1371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:35,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 438 states to 438 states and 1371 transitions. [2021-05-22 02:25:35,559 INFO L78 Accepts]: Start accepts. Automaton has 438 states and 1371 transitions. Word has length 21 [2021-05-22 02:25:35,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:35,559 INFO L482 AbstractCegarLoop]: Abstraction has 438 states and 1371 transitions. [2021-05-22 02:25:35,559 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:35,560 INFO L276 IsEmpty]: Start isEmpty. Operand 438 states and 1371 transitions. [2021-05-22 02:25:35,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:35,560 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:35,560 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:35,760 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 366 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1645 [2021-05-22 02:25:35,760 INFO L430 AbstractCegarLoop]: === Iteration 378 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:35,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:35,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1317174607, now seen corresponding path program 366 times [2021-05-22 02:25:35,761 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:35,761 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937752444] [2021-05-22 02:25:35,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:35,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:35,832 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:35,832 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:35,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937752444] [2021-05-22 02:25:35,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937752444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:35,832 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [477300816] [2021-05-22 02:25:35,832 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 367 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 367 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:35,858 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:35,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:35,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:35,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:35,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:35,894 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:35,897 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,903 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:35,904 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:35,904 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:35,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:35,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:35,931 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:35,939 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:35,940 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:35,940 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:35,940 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:25:35,964 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:35,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [477300816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:35,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:35,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:25:35,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704580791] [2021-05-22 02:25:35,964 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:25:35,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:35,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:25:35,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:25:35,965 INFO L87 Difference]: Start difference. First operand 438 states and 1371 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:36,166 INFO L93 Difference]: Finished difference Result 825 states and 2508 transitions. [2021-05-22 02:25:36,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:36,166 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:36,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:36,167 INFO L225 Difference]: With dead ends: 825 [2021-05-22 02:25:36,167 INFO L226 Difference]: Without dead ends: 802 [2021-05-22 02:25:36,167 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 158.2ms TimeCoverageRelationStatistics Valid=59, Invalid=213, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:36,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 802 states. [2021-05-22 02:25:36,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 802 to 461. [2021-05-22 02:25:36,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.1478260869565218) internal successors, (1448), 460 states have internal predecessors, (1448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1448 transitions. [2021-05-22 02:25:36,173 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1448 transitions. Word has length 21 [2021-05-22 02:25:36,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:36,173 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1448 transitions. [2021-05-22 02:25:36,173 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,173 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1448 transitions. [2021-05-22 02:25:36,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:36,174 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:36,174 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:36,374 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 367 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1650 [2021-05-22 02:25:36,374 INFO L430 AbstractCegarLoop]: === Iteration 379 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:36,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:36,375 INFO L82 PathProgramCache]: Analyzing trace with hash -927835043, now seen corresponding path program 367 times [2021-05-22 02:25:36,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:36,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177968599] [2021-05-22 02:25:36,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:36,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:36,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:36,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177968599] [2021-05-22 02:25:36,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177968599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:36,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475049070] [2021-05-22 02:25:36,446 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 368 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 368 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:36,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:36,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:36,472 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:36,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:36,509 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:36,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:36,511 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:36,517 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:36,518 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:36,518 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:36,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:36,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:36,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:36,563 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:36,563 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:36,563 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:36,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:36,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475049070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:36,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:36,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:25:36,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388427102] [2021-05-22 02:25:36,578 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:25:36,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:36,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:25:36,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:25:36,579 INFO L87 Difference]: Start difference. First operand 461 states and 1448 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:36,781 INFO L93 Difference]: Finished difference Result 785 states and 2397 transitions. [2021-05-22 02:25:36,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:36,782 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:36,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:36,783 INFO L225 Difference]: With dead ends: 785 [2021-05-22 02:25:36,783 INFO L226 Difference]: Without dead ends: 766 [2021-05-22 02:25:36,783 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 149.7ms TimeCoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:36,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2021-05-22 02:25:36,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 458. [2021-05-22 02:25:36,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1466083150984683) internal successors, (1438), 457 states have internal predecessors, (1438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1438 transitions. [2021-05-22 02:25:36,789 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1438 transitions. Word has length 21 [2021-05-22 02:25:36,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:36,789 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1438 transitions. [2021-05-22 02:25:36,789 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:36,789 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1438 transitions. [2021-05-22 02:25:36,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:36,789 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:36,789 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:36,989 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 368 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1656 [2021-05-22 02:25:36,990 INFO L430 AbstractCegarLoop]: === Iteration 380 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:36,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:36,990 INFO L82 PathProgramCache]: Analyzing trace with hash 557254283, now seen corresponding path program 368 times [2021-05-22 02:25:36,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:36,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847630428] [2021-05-22 02:25:36,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:36,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:37,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:37,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:37,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847630428] [2021-05-22 02:25:37,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847630428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:37,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035498268] [2021-05-22 02:25:37,066 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 369 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 369 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:37,091 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:37,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:37,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:37,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:37,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:37,121 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:37,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:37,124 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:37,133 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:37,133 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:37,134 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:25:37,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:37,159 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:37,162 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:37,163 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:25:37,163 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:37,163 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:25:37,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:37,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035498268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:37,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:37,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:37,204 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2093777059] [2021-05-22 02:25:37,204 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:37,204 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:37,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:37,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:37,204 INFO L87 Difference]: Start difference. First operand 458 states and 1438 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:37,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:37,583 INFO L93 Difference]: Finished difference Result 938 states and 2845 transitions. [2021-05-22 02:25:37,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:37,584 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:37,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:37,585 INFO L225 Difference]: With dead ends: 938 [2021-05-22 02:25:37,585 INFO L226 Difference]: Without dead ends: 919 [2021-05-22 02:25:37,585 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 274.0ms TimeCoverageRelationStatistics Valid=126, Invalid=426, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:25:37,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2021-05-22 02:25:37,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 440. [2021-05-22 02:25:37,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 439 states have (on average 3.120728929384966) internal successors, (1370), 439 states have internal predecessors, (1370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:37,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 1370 transitions. [2021-05-22 02:25:37,591 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 1370 transitions. Word has length 21 [2021-05-22 02:25:37,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:37,591 INFO L482 AbstractCegarLoop]: Abstraction has 440 states and 1370 transitions. [2021-05-22 02:25:37,591 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:37,591 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 1370 transitions. [2021-05-22 02:25:37,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:37,592 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:37,592 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:37,792 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 369 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1660 [2021-05-22 02:25:37,792 INFO L430 AbstractCegarLoop]: === Iteration 381 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:37,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:37,792 INFO L82 PathProgramCache]: Analyzing trace with hash 610742443, now seen corresponding path program 369 times [2021-05-22 02:25:37,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:37,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135670994] [2021-05-22 02:25:37,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:37,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:37,885 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:37,885 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:37,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135670994] [2021-05-22 02:25:37,885 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135670994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:37,885 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10130358] [2021-05-22 02:25:37,885 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 370 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 370 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:37,910 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:37,910 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:37,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:37,911 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:37,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:37,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:37,976 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:37,982 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:37,984 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:37,984 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:25:38,054 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:38,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:38,055 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,062 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:38,064 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:38,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:38,064 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,071 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:38,072 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,072 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:25:38,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:38,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10130358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:38,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:38,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:38,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284649437] [2021-05-22 02:25:38,080 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:38,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:38,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:38,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:38,080 INFO L87 Difference]: Start difference. First operand 440 states and 1370 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:38,210 INFO L93 Difference]: Finished difference Result 520 states and 1601 transitions. [2021-05-22 02:25:38,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:38,210 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:38,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:38,211 INFO L225 Difference]: With dead ends: 520 [2021-05-22 02:25:38,211 INFO L226 Difference]: Without dead ends: 498 [2021-05-22 02:25:38,211 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 165.7ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:38,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2021-05-22 02:25:38,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 450. [2021-05-22 02:25:38,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.1269487750556793) internal successors, (1404), 449 states have internal predecessors, (1404), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1404 transitions. [2021-05-22 02:25:38,215 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1404 transitions. Word has length 21 [2021-05-22 02:25:38,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:38,215 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1404 transitions. [2021-05-22 02:25:38,215 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,215 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1404 transitions. [2021-05-22 02:25:38,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:38,216 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:38,216 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:38,416 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 370 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1664 [2021-05-22 02:25:38,416 INFO L430 AbstractCegarLoop]: === Iteration 382 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:38,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:38,416 INFO L82 PathProgramCache]: Analyzing trace with hash 108951107, now seen corresponding path program 370 times [2021-05-22 02:25:38,417 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:38,417 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1614496067] [2021-05-22 02:25:38,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:38,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:38,502 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:38,502 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:38,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1614496067] [2021-05-22 02:25:38,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1614496067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:38,502 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926739334] [2021-05-22 02:25:38,502 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 371 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 371 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:38,527 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:38,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:38,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:38,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:38,592 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:38,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:38,594 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,600 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:38,601 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:38,602 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:25:38,628 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:38,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:38,629 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:38,640 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:38,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:38,641 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,648 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:38,649 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:38,649 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:25:38,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:38,662 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926739334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:38,662 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:38,662 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:38,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854405063] [2021-05-22 02:25:38,663 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:38,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:38,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:38,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:38,663 INFO L87 Difference]: Start difference. First operand 450 states and 1404 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:38,768 INFO L93 Difference]: Finished difference Result 529 states and 1625 transitions. [2021-05-22 02:25:38,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:38,768 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:38,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:38,769 INFO L225 Difference]: With dead ends: 529 [2021-05-22 02:25:38,769 INFO L226 Difference]: Without dead ends: 507 [2021-05-22 02:25:38,769 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 135.2ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:38,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-05-22 02:25:38,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 447. [2021-05-22 02:25:38,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.1210762331838566) internal successors, (1392), 446 states have internal predecessors, (1392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1392 transitions. [2021-05-22 02:25:38,773 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1392 transitions. Word has length 21 [2021-05-22 02:25:38,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:38,773 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1392 transitions. [2021-05-22 02:25:38,773 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:38,773 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1392 transitions. [2021-05-22 02:25:38,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:38,774 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:38,774 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:38,974 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1670,371 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:38,974 INFO L430 AbstractCegarLoop]: === Iteration 383 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:38,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:38,975 INFO L82 PathProgramCache]: Analyzing trace with hash -1997833013, now seen corresponding path program 371 times [2021-05-22 02:25:38,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:38,975 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484369018] [2021-05-22 02:25:38,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:38,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:39,075 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:39,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484369018] [2021-05-22 02:25:39,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484369018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:39,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260267894] [2021-05-22 02:25:39,075 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 372 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 372 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:39,101 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:39,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:39,102 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:39,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:39,165 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:39,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,174 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:39,174 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:25:39,201 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:39,202 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,212 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,212 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:39,213 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,221 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,221 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,221 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:25:39,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:39,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260267894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:39,235 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:39,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:39,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253993990] [2021-05-22 02:25:39,235 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:39,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:39,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:39,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:39,235 INFO L87 Difference]: Start difference. First operand 447 states and 1392 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:39,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:39,356 INFO L93 Difference]: Finished difference Result 517 states and 1592 transitions. [2021-05-22 02:25:39,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:39,356 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:39,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:39,357 INFO L225 Difference]: With dead ends: 517 [2021-05-22 02:25:39,357 INFO L226 Difference]: Without dead ends: 495 [2021-05-22 02:25:39,357 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 136.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:39,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2021-05-22 02:25:39,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 444. [2021-05-22 02:25:39,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.1218961625282167) internal successors, (1383), 443 states have internal predecessors, (1383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:39,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1383 transitions. [2021-05-22 02:25:39,362 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1383 transitions. Word has length 21 [2021-05-22 02:25:39,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:39,362 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1383 transitions. [2021-05-22 02:25:39,362 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:39,362 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1383 transitions. [2021-05-22 02:25:39,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:39,363 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:39,363 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:39,565 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 372 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1672 [2021-05-22 02:25:39,565 INFO L430 AbstractCegarLoop]: === Iteration 384 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:39,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:39,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1479046379, now seen corresponding path program 372 times [2021-05-22 02:25:39,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:39,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355462277] [2021-05-22 02:25:39,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:39,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:39,688 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:39,688 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:39,688 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355462277] [2021-05-22 02:25:39,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355462277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:39,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555446864] [2021-05-22 02:25:39,690 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 373 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 373 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:39,718 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:25:39,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:39,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:39,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:39,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:39,795 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,796 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:39,797 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,808 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,809 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:39,809 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:25:39,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:39,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,882 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:39,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:39,884 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,891 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:39,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:39,892 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:25:39,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:39,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555446864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:39,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:39,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:39,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327587732] [2021-05-22 02:25:39,919 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:39,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:39,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:39,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:39,920 INFO L87 Difference]: Start difference. First operand 444 states and 1383 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:40,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:40,238 INFO L93 Difference]: Finished difference Result 632 states and 1941 transitions. [2021-05-22 02:25:40,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:40,239 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:40,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:40,242 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:25:40,242 INFO L226 Difference]: Without dead ends: 613 [2021-05-22 02:25:40,242 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 273.7ms TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:40,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2021-05-22 02:25:40,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 448. [2021-05-22 02:25:40,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.120805369127517) internal successors, (1395), 447 states have internal predecessors, (1395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:40,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1395 transitions. [2021-05-22 02:25:40,249 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1395 transitions. Word has length 21 [2021-05-22 02:25:40,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:40,249 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1395 transitions. [2021-05-22 02:25:40,249 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:40,249 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1395 transitions. [2021-05-22 02:25:40,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:40,250 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:40,250 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:40,450 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 373 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1674 [2021-05-22 02:25:40,450 INFO L430 AbstractCegarLoop]: === Iteration 385 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:40,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:40,451 INFO L82 PathProgramCache]: Analyzing trace with hash -1701254991, now seen corresponding path program 373 times [2021-05-22 02:25:40,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:40,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151692320] [2021-05-22 02:25:40,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:40,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:40,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:40,542 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:40,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151692320] [2021-05-22 02:25:40,542 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151692320] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:40,542 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [223755656] [2021-05-22 02:25:40,542 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 374 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 374 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:40,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:40,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:40,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:40,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:40,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:40,631 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:40,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:40,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:40,639 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:25:40,716 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:40,716 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:40,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:40,717 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:40,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:40,720 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:40,731 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:40,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:40,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:40,733 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:40,744 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:40,745 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:40,745 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:51, output treesize:5 [2021-05-22 02:25:40,772 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:40,772 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [223755656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:40,772 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:40,772 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:40,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123443971] [2021-05-22 02:25:40,772 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:40,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:40,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:40,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:40,773 INFO L87 Difference]: Start difference. First operand 448 states and 1395 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:41,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:41,194 INFO L93 Difference]: Finished difference Result 784 states and 2382 transitions. [2021-05-22 02:25:41,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:25:41,194 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:41,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:41,195 INFO L225 Difference]: With dead ends: 784 [2021-05-22 02:25:41,195 INFO L226 Difference]: Without dead ends: 724 [2021-05-22 02:25:41,195 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 313.6ms TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:41,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-05-22 02:25:41,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 448. [2021-05-22 02:25:41,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.116331096196868) internal successors, (1393), 447 states have internal predecessors, (1393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:41,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1393 transitions. [2021-05-22 02:25:41,201 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1393 transitions. Word has length 21 [2021-05-22 02:25:41,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:41,201 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1393 transitions. [2021-05-22 02:25:41,201 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:41,201 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1393 transitions. [2021-05-22 02:25:41,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:41,201 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:41,201 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:41,402 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1680,374 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:41,402 INFO L430 AbstractCegarLoop]: === Iteration 386 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:41,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:41,402 INFO L82 PathProgramCache]: Analyzing trace with hash 207345461, now seen corresponding path program 374 times [2021-05-22 02:25:41,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:41,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [307268849] [2021-05-22 02:25:41,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:41,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:41,497 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:41,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:41,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [307268849] [2021-05-22 02:25:41,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [307268849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:41,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650035204] [2021-05-22 02:25:41,497 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 375 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 375 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:41,523 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:41,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:41,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:41,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:41,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:41,599 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:41,601 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:41,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:41,602 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:41,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:41,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:41,615 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:25:41,656 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:41,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:41,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:41,658 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:41,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:41,661 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:41,675 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:41,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:41,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:41,678 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:41,691 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:41,692 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:41,693 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:25:41,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:41,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650035204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:41,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:41,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:41,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297438256] [2021-05-22 02:25:41,739 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:41,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:41,739 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:41,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:41,739 INFO L87 Difference]: Start difference. First operand 448 states and 1393 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:42,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:42,047 INFO L93 Difference]: Finished difference Result 700 states and 2152 transitions. [2021-05-22 02:25:42,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:42,048 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:42,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:42,048 INFO L225 Difference]: With dead ends: 700 [2021-05-22 02:25:42,049 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:25:42,049 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 259.4ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:42,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:25:42,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 446. [2021-05-22 02:25:42,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.1191011235955055) internal successors, (1388), 445 states have internal predecessors, (1388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:42,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1388 transitions. [2021-05-22 02:25:42,054 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1388 transitions. Word has length 21 [2021-05-22 02:25:42,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:42,054 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1388 transitions. [2021-05-22 02:25:42,054 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:42,054 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1388 transitions. [2021-05-22 02:25:42,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:42,054 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:42,054 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:42,255 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1690,375 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:42,255 INFO L430 AbstractCegarLoop]: === Iteration 387 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:42,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:42,255 INFO L82 PathProgramCache]: Analyzing trace with hash -678452819, now seen corresponding path program 375 times [2021-05-22 02:25:42,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:42,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733357092] [2021-05-22 02:25:42,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:42,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:42,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:42,346 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:42,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733357092] [2021-05-22 02:25:42,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733357092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:42,346 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1180122065] [2021-05-22 02:25:42,346 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 376 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 376 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:42,371 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:25:42,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:42,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:25:42,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:42,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,464 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:25:42,465 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:42,468 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:42,492 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:42,492 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:83, output treesize:71 [2021-05-22 02:25:42,573 INFO L446 ElimStorePlain]: Different costs {1=[o_0], 3=[o_2]} [2021-05-22 02:25:42,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:25:42,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:42,592 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,595 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:25:42,597 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,600 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:42,601 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:42,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:42,640 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:42,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:25:42,643 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:42,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:42,678 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:25:42,679 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:145, output treesize:34 [2021-05-22 02:25:42,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:42,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1180122065] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:42,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:42,763 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:42,763 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237101723] [2021-05-22 02:25:42,763 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:42,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:42,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:42,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:42,764 INFO L87 Difference]: Start difference. First operand 446 states and 1388 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:43,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:43,131 INFO L93 Difference]: Finished difference Result 652 states and 2010 transitions. [2021-05-22 02:25:43,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:25:43,131 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:43,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:43,132 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:25:43,132 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:25:43,132 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 356.5ms TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:43,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:25:43,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 446. [2021-05-22 02:25:43,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.1191011235955055) internal successors, (1388), 445 states have internal predecessors, (1388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:43,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1388 transitions. [2021-05-22 02:25:43,137 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1388 transitions. Word has length 21 [2021-05-22 02:25:43,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:43,137 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1388 transitions. [2021-05-22 02:25:43,137 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:43,137 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1388 transitions. [2021-05-22 02:25:43,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:43,137 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:43,137 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:43,337 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 376 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1698 [2021-05-22 02:25:43,338 INFO L430 AbstractCegarLoop]: === Iteration 388 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:43,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:43,338 INFO L82 PathProgramCache]: Analyzing trace with hash -962715503, now seen corresponding path program 376 times [2021-05-22 02:25:43,338 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:43,338 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1543515728] [2021-05-22 02:25:43,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:43,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:43,430 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:43,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:43,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1543515728] [2021-05-22 02:25:43,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1543515728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:43,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1091560460] [2021-05-22 02:25:43,430 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 377 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 377 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:43,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:43,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:43,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:43,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:43,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:43,534 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:43,535 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:43,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:43,536 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:43,547 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:43,548 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:43,548 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:25:43,606 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:43,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:43,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:43,608 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:43,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:43,611 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:43,625 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:43,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:43,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:43,628 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:43,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:43,647 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:43,647 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:25:43,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:43,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1091560460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:43,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:43,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:43,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621409933] [2021-05-22 02:25:43,707 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:43,707 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:43,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:43,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:43,707 INFO L87 Difference]: Start difference. First operand 446 states and 1388 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:44,128 INFO L93 Difference]: Finished difference Result 725 states and 2220 transitions. [2021-05-22 02:25:44,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:25:44,129 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:44,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:44,130 INFO L225 Difference]: With dead ends: 725 [2021-05-22 02:25:44,130 INFO L226 Difference]: Without dead ends: 698 [2021-05-22 02:25:44,130 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 379.5ms TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:44,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-22 02:25:44,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 458. [2021-05-22 02:25:44,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.111597374179431) internal successors, (1422), 457 states have internal predecessors, (1422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1422 transitions. [2021-05-22 02:25:44,135 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1422 transitions. Word has length 21 [2021-05-22 02:25:44,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:44,135 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1422 transitions. [2021-05-22 02:25:44,135 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,136 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1422 transitions. [2021-05-22 02:25:44,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:44,136 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:44,136 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:44,336 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1712,377 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:44,337 INFO L430 AbstractCegarLoop]: === Iteration 389 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:44,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:44,337 INFO L82 PathProgramCache]: Analyzing trace with hash 723676337, now seen corresponding path program 377 times [2021-05-22 02:25:44,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:44,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949525592] [2021-05-22 02:25:44,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:44,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:44,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:44,426 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:44,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949525592] [2021-05-22 02:25:44,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949525592] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:44,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871803468] [2021-05-22 02:25:44,427 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 378 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 378 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:44,452 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:44,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:44,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:44,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:44,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:44,532 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:44,534 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:44,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:44,535 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:44,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:44,546 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:44,547 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:25:44,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:44,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:44,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:44,611 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:44,613 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:44,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:44,614 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:44,620 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:44,621 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:44,621 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:25:44,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:44,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [871803468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:44,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:44,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:44,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929240881] [2021-05-22 02:25:44,652 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:44,652 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:44,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:44,652 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:44,652 INFO L87 Difference]: Start difference. First operand 458 states and 1422 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:44,970 INFO L93 Difference]: Finished difference Result 628 states and 1922 transitions. [2021-05-22 02:25:44,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:44,971 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:44,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:44,971 INFO L225 Difference]: With dead ends: 628 [2021-05-22 02:25:44,971 INFO L226 Difference]: Without dead ends: 607 [2021-05-22 02:25:44,972 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 315.1ms TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:44,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-22 02:25:44,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 444. [2021-05-22 02:25:44,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.1218961625282167) internal successors, (1383), 443 states have internal predecessors, (1383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1383 transitions. [2021-05-22 02:25:44,982 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1383 transitions. Word has length 21 [2021-05-22 02:25:44,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:44,982 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1383 transitions. [2021-05-22 02:25:44,982 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:44,982 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1383 transitions. [2021-05-22 02:25:44,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:44,982 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:44,983 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:45,183 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1724,378 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:45,183 INFO L430 AbstractCegarLoop]: === Iteration 390 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:45,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:45,183 INFO L82 PathProgramCache]: Analyzing trace with hash -265079971, now seen corresponding path program 378 times [2021-05-22 02:25:45,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:45,183 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630348796] [2021-05-22 02:25:45,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:45,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:45,300 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:45,300 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:45,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630348796] [2021-05-22 02:25:45,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630348796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:45,300 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605988558] [2021-05-22 02:25:45,300 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 379 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 379 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:45,325 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:25:45,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:45,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:45,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:45,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:45,379 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:45,381 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:45,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:45,382 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:45,399 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:45,401 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:45,401 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:45,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:45,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:45,498 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:45,505 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:45,506 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:45,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:45,507 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:45,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:45,515 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:45,515 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:25:45,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:45,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1605988558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:45,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:45,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:45,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239284255] [2021-05-22 02:25:45,523 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:45,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:45,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:45,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:45,523 INFO L87 Difference]: Start difference. First operand 444 states and 1383 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:45,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:45,657 INFO L93 Difference]: Finished difference Result 568 states and 1748 transitions. [2021-05-22 02:25:45,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:45,657 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:45,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:45,658 INFO L225 Difference]: With dead ends: 568 [2021-05-22 02:25:45,658 INFO L226 Difference]: Without dead ends: 546 [2021-05-22 02:25:45,658 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 181.8ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:45,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-22 02:25:45,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 451. [2021-05-22 02:25:45,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.1355555555555554) internal successors, (1411), 450 states have internal predecessors, (1411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:45,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1411 transitions. [2021-05-22 02:25:45,663 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1411 transitions. Word has length 21 [2021-05-22 02:25:45,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:45,663 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1411 transitions. [2021-05-22 02:25:45,663 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:45,663 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1411 transitions. [2021-05-22 02:25:45,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:45,663 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:45,663 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:45,863 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1731,379 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:45,864 INFO L430 AbstractCegarLoop]: === Iteration 391 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:45,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:45,864 INFO L82 PathProgramCache]: Analyzing trace with hash -766871307, now seen corresponding path program 379 times [2021-05-22 02:25:45,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:45,864 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500873176] [2021-05-22 02:25:45,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:45,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:45,982 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:45,982 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:45,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500873176] [2021-05-22 02:25:45,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500873176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:45,982 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [99179163] [2021-05-22 02:25:45,982 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 380 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 380 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:46,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:46,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:46,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:46,075 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,076 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:46,077 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:46,080 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,102 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:46,103 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:46,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:46,182 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,197 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:46,198 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,208 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,209 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,209 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:25:46,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:46,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [99179163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:46,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:46,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:46,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092967391] [2021-05-22 02:25:46,226 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:46,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:46,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:46,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:46,226 INFO L87 Difference]: Start difference. First operand 451 states and 1411 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:46,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:46,418 INFO L93 Difference]: Finished difference Result 559 states and 1724 transitions. [2021-05-22 02:25:46,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:46,418 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:46,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:46,419 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:25:46,419 INFO L226 Difference]: Without dead ends: 537 [2021-05-22 02:25:46,419 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 188.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:46,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 537 states. [2021-05-22 02:25:46,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 537 to 448. [2021-05-22 02:25:46,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.1297539149888145) internal successors, (1399), 447 states have internal predecessors, (1399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:46,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1399 transitions. [2021-05-22 02:25:46,426 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1399 transitions. Word has length 21 [2021-05-22 02:25:46,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:46,426 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1399 transitions. [2021-05-22 02:25:46,426 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:46,426 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1399 transitions. [2021-05-22 02:25:46,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:46,427 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:46,427 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:46,627 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1739,380 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:46,627 INFO L430 AbstractCegarLoop]: === Iteration 392 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:46,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:46,628 INFO L82 PathProgramCache]: Analyzing trace with hash 360244147, now seen corresponding path program 380 times [2021-05-22 02:25:46,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:46,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209361654] [2021-05-22 02:25:46,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:46,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:46,714 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:46,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:46,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209361654] [2021-05-22 02:25:46,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209361654] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:46,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425385974] [2021-05-22 02:25:46,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 381 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 381 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:46,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:46,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:46,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:46,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:46,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:46,803 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:46,806 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,819 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,820 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:46,821 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:46,928 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:46,929 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,936 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:46,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:46,938 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,945 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:46,946 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:46,946 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:25:46,954 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:46,954 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425385974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:46,954 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:46,954 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:46,954 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47860614] [2021-05-22 02:25:46,954 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:46,954 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:46,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:46,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:46,955 INFO L87 Difference]: Start difference. First operand 448 states and 1399 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:47,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:47,167 INFO L93 Difference]: Finished difference Result 547 states and 1673 transitions. [2021-05-22 02:25:47,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:47,167 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:47,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:47,168 INFO L225 Difference]: With dead ends: 547 [2021-05-22 02:25:47,168 INFO L226 Difference]: Without dead ends: 528 [2021-05-22 02:25:47,168 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 192.0ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:25:47,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-05-22 02:25:47,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 454. [2021-05-22 02:25:47,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1390728476821192) internal successors, (1422), 453 states have internal predecessors, (1422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:47,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1422 transitions. [2021-05-22 02:25:47,172 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1422 transitions. Word has length 21 [2021-05-22 02:25:47,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:47,172 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1422 transitions. [2021-05-22 02:25:47,172 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:47,172 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1422 transitions. [2021-05-22 02:25:47,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:47,173 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:47,173 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:47,373 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 381 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1743 [2021-05-22 02:25:47,373 INFO L430 AbstractCegarLoop]: === Iteration 393 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:47,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:47,374 INFO L82 PathProgramCache]: Analyzing trace with hash 138035535, now seen corresponding path program 381 times [2021-05-22 02:25:47,374 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:47,374 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327595298] [2021-05-22 02:25:47,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:47,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:47,468 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:47,468 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:47,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327595298] [2021-05-22 02:25:47,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327595298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:47,468 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253409358] [2021-05-22 02:25:47,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 382 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 382 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:47,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:47,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:47,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:47,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:47,539 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:47,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:47,541 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:47,548 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:47,549 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:47,549 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:25:47,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:47,655 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:47,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:47,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:47,659 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:47,672 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:47,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:47,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:47,675 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:47,685 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:47,687 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:47,687 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:51, output treesize:5 [2021-05-22 02:25:47,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:47,714 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253409358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:47,714 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:47,714 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:47,714 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268925603] [2021-05-22 02:25:47,714 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:47,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:47,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:47,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:47,714 INFO L87 Difference]: Start difference. First operand 454 states and 1422 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:48,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:48,100 INFO L93 Difference]: Finished difference Result 756 states and 2294 transitions. [2021-05-22 02:25:48,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:25:48,100 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:48,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:48,101 INFO L225 Difference]: With dead ends: 756 [2021-05-22 02:25:48,101 INFO L226 Difference]: Without dead ends: 696 [2021-05-22 02:25:48,101 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 272.2ms TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:48,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2021-05-22 02:25:48,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 454. [2021-05-22 02:25:48,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1280353200883004) internal successors, (1417), 453 states have internal predecessors, (1417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:48,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1417 transitions. [2021-05-22 02:25:48,106 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1417 transitions. Word has length 21 [2021-05-22 02:25:48,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:48,106 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1417 transitions. [2021-05-22 02:25:48,106 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:48,106 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1417 transitions. [2021-05-22 02:25:48,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:48,107 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:48,107 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:48,307 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 382 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1752 [2021-05-22 02:25:48,307 INFO L430 AbstractCegarLoop]: === Iteration 394 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:48,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:48,307 INFO L82 PathProgramCache]: Analyzing trace with hash 2046635987, now seen corresponding path program 382 times [2021-05-22 02:25:48,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:48,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796099870] [2021-05-22 02:25:48,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:48,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:48,408 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:48,408 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:48,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1796099870] [2021-05-22 02:25:48,408 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1796099870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:48,408 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1853028691] [2021-05-22 02:25:48,408 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 383 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 383 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:48,445 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:48,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:48,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:48,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:48,506 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:48,507 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:48,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:48,508 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:48,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:48,510 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:48,524 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:48,525 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:48,525 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:48,611 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:48,612 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:48,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:48,613 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:48,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:48,616 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:48,630 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:48,632 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:48,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:48,633 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:48,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:48,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:48,648 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:25:48,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:48,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1853028691] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:48,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:48,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:48,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5645801] [2021-05-22 02:25:48,695 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:48,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:48,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:48,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:48,695 INFO L87 Difference]: Start difference. First operand 454 states and 1417 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:49,008 INFO L93 Difference]: Finished difference Result 704 states and 2159 transitions. [2021-05-22 02:25:49,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:49,008 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:49,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:49,009 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:25:49,009 INFO L226 Difference]: Without dead ends: 681 [2021-05-22 02:25:49,009 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 280.3ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:49,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-05-22 02:25:49,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 452. [2021-05-22 02:25:49,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.130820399113082) internal successors, (1412), 451 states have internal predecessors, (1412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1412 transitions. [2021-05-22 02:25:49,014 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1412 transitions. Word has length 21 [2021-05-22 02:25:49,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:49,014 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1412 transitions. [2021-05-22 02:25:49,014 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,014 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1412 transitions. [2021-05-22 02:25:49,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:49,015 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:49,015 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:49,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 383 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1762 [2021-05-22 02:25:49,217 INFO L430 AbstractCegarLoop]: === Iteration 395 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:49,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:49,217 INFO L82 PathProgramCache]: Analyzing trace with hash 48507605, now seen corresponding path program 383 times [2021-05-22 02:25:49,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:49,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638374364] [2021-05-22 02:25:49,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:49,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:49,317 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:49,318 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:49,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638374364] [2021-05-22 02:25:49,318 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638374364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:49,318 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817293981] [2021-05-22 02:25:49,318 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 384 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 384 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:49,353 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:25:49,353 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:49,353 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:49,354 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:49,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:49,423 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:49,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:49,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:49,426 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:49,439 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:49,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:49,440 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:49,508 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:49,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:49,509 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:49,517 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:49,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:49,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:49,520 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:49,528 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:49,529 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:49,529 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:10 [2021-05-22 02:25:49,571 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:49,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1817293981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:49,571 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:49,571 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:49,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [156228223] [2021-05-22 02:25:49,571 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:49,571 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:49,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:49,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:49,572 INFO L87 Difference]: Start difference. First operand 452 states and 1412 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:49,848 INFO L93 Difference]: Finished difference Result 634 states and 1943 transitions. [2021-05-22 02:25:49,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:49,848 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:49,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:49,849 INFO L225 Difference]: With dead ends: 634 [2021-05-22 02:25:49,849 INFO L226 Difference]: Without dead ends: 615 [2021-05-22 02:25:49,849 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 274.0ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:25:49,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-05-22 02:25:49,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 448. [2021-05-22 02:25:49,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.1230425055928412) internal successors, (1396), 447 states have internal predecessors, (1396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1396 transitions. [2021-05-22 02:25:49,854 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1396 transitions. Word has length 21 [2021-05-22 02:25:49,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:49,854 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1396 transitions. [2021-05-22 02:25:49,854 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:49,854 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1396 transitions. [2021-05-22 02:25:49,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:49,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:49,854 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:50,054 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 384 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1775 [2021-05-22 02:25:50,055 INFO L430 AbstractCegarLoop]: === Iteration 396 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:50,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:50,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1680454283, now seen corresponding path program 384 times [2021-05-22 02:25:50,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:50,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96909428] [2021-05-22 02:25:50,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:50,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:50,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:50,169 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:50,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96909428] [2021-05-22 02:25:50,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96909428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:50,169 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [759533603] [2021-05-22 02:25:50,169 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 385 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 385 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:50,194 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:25:50,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:50,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:50,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:50,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:50,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:50,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:50,253 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,270 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:50,271 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:50,272 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:50,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:50,357 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:50,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:50,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:50,361 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:50,376 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:50,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:50,377 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:50,391 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:50,391 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:25:50,417 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:50,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [759533603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:50,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:50,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:50,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760598716] [2021-05-22 02:25:50,417 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:50,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:50,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:50,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:50,418 INFO L87 Difference]: Start difference. First operand 448 states and 1396 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:50,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:50,585 INFO L93 Difference]: Finished difference Result 577 states and 1776 transitions. [2021-05-22 02:25:50,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:50,585 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:50,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:50,586 INFO L225 Difference]: With dead ends: 577 [2021-05-22 02:25:50,586 INFO L226 Difference]: Without dead ends: 548 [2021-05-22 02:25:50,586 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 183.8ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:50,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-05-22 02:25:50,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 448. [2021-05-22 02:25:50,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.1230425055928412) internal successors, (1396), 447 states have internal predecessors, (1396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:50,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1396 transitions. [2021-05-22 02:25:50,591 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1396 transitions. Word has length 21 [2021-05-22 02:25:50,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:50,591 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1396 transitions. [2021-05-22 02:25:50,591 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:50,591 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1396 transitions. [2021-05-22 02:25:50,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:50,591 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:50,591 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:50,793 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 385 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1781 [2021-05-22 02:25:50,794 INFO L430 AbstractCegarLoop]: === Iteration 397 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:50,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:50,794 INFO L82 PathProgramCache]: Analyzing trace with hash 1519814095, now seen corresponding path program 385 times [2021-05-22 02:25:50,794 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:50,794 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859157778] [2021-05-22 02:25:50,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:50,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:50,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:50,897 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:50,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859157778] [2021-05-22 02:25:50,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859157778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:50,897 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [927963036] [2021-05-22 02:25:50,897 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 386 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 386 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:50,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:50,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:50,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:50,966 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:50,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:50,967 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:50,975 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:50,976 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:50,976 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:25:51,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:51,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:51,062 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:51,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:51,063 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:51,078 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:51,080 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:51,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:51,081 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:51,094 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:51,095 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:51,096 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:13 [2021-05-22 02:25:51,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:51,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [927963036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:51,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:51,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:51,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297425891] [2021-05-22 02:25:51,145 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:51,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:51,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:51,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:51,146 INFO L87 Difference]: Start difference. First operand 448 states and 1396 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:51,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:51,569 INFO L93 Difference]: Finished difference Result 846 states and 2561 transitions. [2021-05-22 02:25:51,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:25:51,569 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:51,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:51,570 INFO L225 Difference]: With dead ends: 846 [2021-05-22 02:25:51,570 INFO L226 Difference]: Without dead ends: 792 [2021-05-22 02:25:51,570 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 398.6ms TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:51,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2021-05-22 02:25:51,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 449. [2021-05-22 02:25:51,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1450892857142856) internal successors, (1409), 448 states have internal predecessors, (1409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:51,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1409 transitions. [2021-05-22 02:25:51,575 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1409 transitions. Word has length 21 [2021-05-22 02:25:51,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:51,575 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1409 transitions. [2021-05-22 02:25:51,576 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:51,576 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1409 transitions. [2021-05-22 02:25:51,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:51,576 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:51,576 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:51,776 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 386 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1793 [2021-05-22 02:25:51,777 INFO L430 AbstractCegarLoop]: === Iteration 398 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:51,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:51,777 INFO L82 PathProgramCache]: Analyzing trace with hash 895528331, now seen corresponding path program 386 times [2021-05-22 02:25:51,777 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:51,777 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [33488612] [2021-05-22 02:25:51,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:51,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:51,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:51,870 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:51,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [33488612] [2021-05-22 02:25:51,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [33488612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:51,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41460950] [2021-05-22 02:25:51,870 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 387 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 387 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:51,895 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:51,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:51,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:51,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:51,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:51,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:51,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:51,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:51,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:51,951 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:51,968 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:51,969 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:51,969 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:52,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:52,011 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,013 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:52,014 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,030 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:52,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:52,033 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:52,049 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:52,049 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:25:52,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:52,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41460950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:52,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:52,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:52,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642774540] [2021-05-22 02:25:52,091 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:52,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:52,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:52,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:52,092 INFO L87 Difference]: Start difference. First operand 449 states and 1409 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:52,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:52,264 INFO L93 Difference]: Finished difference Result 585 states and 1806 transitions. [2021-05-22 02:25:52,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:52,265 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:52,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:52,265 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:25:52,265 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:25:52,265 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 158.7ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:52,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:25:52,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 449. [2021-05-22 02:25:52,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1450892857142856) internal successors, (1409), 448 states have internal predecessors, (1409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:52,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1409 transitions. [2021-05-22 02:25:52,270 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1409 transitions. Word has length 21 [2021-05-22 02:25:52,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:52,270 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1409 transitions. [2021-05-22 02:25:52,270 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:52,270 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1409 transitions. [2021-05-22 02:25:52,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:52,271 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:52,271 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:52,471 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1806,387 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:52,471 INFO L430 AbstractCegarLoop]: === Iteration 399 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:52,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:52,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1192794741, now seen corresponding path program 387 times [2021-05-22 02:25:52,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:52,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2142116730] [2021-05-22 02:25:52,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:52,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:52,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:52,582 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:52,582 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2142116730] [2021-05-22 02:25:52,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2142116730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:52,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183751904] [2021-05-22 02:25:52,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 388 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 388 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:52,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:52,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:52,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:52,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:52,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:52,671 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:52,674 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,689 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:52,690 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:52,690 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:52,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:52,736 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:52,739 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,756 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:52,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:52,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:52,759 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:52,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:52,776 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:52,776 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:25:52,848 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:52,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183751904] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:52,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:52,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:52,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840344103] [2021-05-22 02:25:52,848 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:52,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:52,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:52,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:52,848 INFO L87 Difference]: Start difference. First operand 449 states and 1409 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:53,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:53,261 INFO L93 Difference]: Finished difference Result 714 states and 2190 transitions. [2021-05-22 02:25:53,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:25:53,262 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:53,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:53,263 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:25:53,263 INFO L226 Difference]: Without dead ends: 691 [2021-05-22 02:25:53,263 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 362.3ms TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:25:53,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-22 02:25:53,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 449. [2021-05-22 02:25:53,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1450892857142856) internal successors, (1409), 448 states have internal predecessors, (1409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:53,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1409 transitions. [2021-05-22 02:25:53,269 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1409 transitions. Word has length 21 [2021-05-22 02:25:53,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:53,269 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1409 transitions. [2021-05-22 02:25:53,269 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:53,269 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1409 transitions. [2021-05-22 02:25:53,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:53,269 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:53,269 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:53,470 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 388 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1812 [2021-05-22 02:25:53,470 INFO L430 AbstractCegarLoop]: === Iteration 400 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:53,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:53,470 INFO L82 PathProgramCache]: Analyzing trace with hash -95799881, now seen corresponding path program 388 times [2021-05-22 02:25:53,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:53,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [122099941] [2021-05-22 02:25:53,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:53,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:53,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:53,580 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:53,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [122099941] [2021-05-22 02:25:53,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [122099941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:53,580 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [295630675] [2021-05-22 02:25:53,580 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 389 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 389 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:53,605 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:53,605 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:53,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:53,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:53,649 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:53,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:53,650 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:53,658 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:53,659 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:53,660 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:25:53,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:53,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:53,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:53,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:53,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:53,711 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:53,728 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:53,730 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:53,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:53,731 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:53,747 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:53,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:53,749 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:25:53,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:53,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [295630675] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:53,823 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:53,823 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:53,823 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026582173] [2021-05-22 02:25:53,823 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:53,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:53,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:53,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:53,824 INFO L87 Difference]: Start difference. First operand 449 states and 1409 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:54,322 INFO L93 Difference]: Finished difference Result 765 states and 2323 transitions. [2021-05-22 02:25:54,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:25:54,323 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:54,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:54,324 INFO L225 Difference]: With dead ends: 765 [2021-05-22 02:25:54,324 INFO L226 Difference]: Without dead ends: 738 [2021-05-22 02:25:54,324 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 405.4ms TimeCoverageRelationStatistics Valid=127, Invalid=473, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:25:54,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2021-05-22 02:25:54,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 444. [2021-05-22 02:25:54,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.1218961625282167) internal successors, (1383), 443 states have internal predecessors, (1383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1383 transitions. [2021-05-22 02:25:54,329 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1383 transitions. Word has length 21 [2021-05-22 02:25:54,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:54,329 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1383 transitions. [2021-05-22 02:25:54,329 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,329 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1383 transitions. [2021-05-22 02:25:54,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:54,330 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:54,330 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:54,530 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1823,389 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:54,530 INFO L430 AbstractCegarLoop]: === Iteration 401 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:54,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:54,531 INFO L82 PathProgramCache]: Analyzing trace with hash -2003051787, now seen corresponding path program 389 times [2021-05-22 02:25:54,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:54,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481616627] [2021-05-22 02:25:54,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:54,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:54,624 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:54,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:54,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481616627] [2021-05-22 02:25:54,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481616627] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:54,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345576791] [2021-05-22 02:25:54,625 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 390 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 390 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:54,649 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:54,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:54,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:54,650 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:54,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:54,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:54,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:54,703 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:54,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:54,706 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:54,723 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:54,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:54,725 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:54,787 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:54,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:54,788 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:54,797 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:54,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:54,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:54,800 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:54,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:54,814 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:54,814 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:25:54,827 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:54,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345576791] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:54,827 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:54,827 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:54,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556678144] [2021-05-22 02:25:54,827 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:54,827 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:54,827 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:54,828 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:54,828 INFO L87 Difference]: Start difference. First operand 444 states and 1383 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:54,982 INFO L93 Difference]: Finished difference Result 558 states and 1717 transitions. [2021-05-22 02:25:54,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:54,982 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:54,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:54,983 INFO L225 Difference]: With dead ends: 558 [2021-05-22 02:25:54,983 INFO L226 Difference]: Without dead ends: 536 [2021-05-22 02:25:54,983 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 151.2ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:54,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-05-22 02:25:54,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 447. [2021-05-22 02:25:54,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.1278026905829597) internal successors, (1395), 446 states have internal predecessors, (1395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1395 transitions. [2021-05-22 02:25:54,988 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1395 transitions. Word has length 21 [2021-05-22 02:25:54,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:54,988 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1395 transitions. [2021-05-22 02:25:54,988 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:54,988 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1395 transitions. [2021-05-22 02:25:54,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:54,988 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:54,988 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:55,189 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 390 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1835 [2021-05-22 02:25:55,189 INFO L430 AbstractCegarLoop]: === Iteration 402 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:55,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:55,189 INFO L82 PathProgramCache]: Analyzing trace with hash -1377727669, now seen corresponding path program 390 times [2021-05-22 02:25:55,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:55,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106974530] [2021-05-22 02:25:55,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:55,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:55,290 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:55,291 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:55,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106974530] [2021-05-22 02:25:55,291 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106974530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:55,291 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064528351] [2021-05-22 02:25:55,291 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 391 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 391 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:55,316 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:25:55,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:55,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:55,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:55,361 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:55,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:55,362 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:55,370 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:55,371 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:55,371 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:25:55,443 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:55,444 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:55,446 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:55,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:55,447 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:55,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:55,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:55,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:55,463 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:55,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:55,478 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:55,478 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:25:55,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:55,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064528351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:55,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:55,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:55,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1634398927] [2021-05-22 02:25:55,524 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:55,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:55,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:55,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:55,524 INFO L87 Difference]: Start difference. First operand 447 states and 1395 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:55,809 INFO L93 Difference]: Finished difference Result 654 states and 2000 transitions. [2021-05-22 02:25:55,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:55,809 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:55,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:55,810 INFO L225 Difference]: With dead ends: 654 [2021-05-22 02:25:55,810 INFO L226 Difference]: Without dead ends: 627 [2021-05-22 02:25:55,810 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 243.1ms TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:25:55,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-05-22 02:25:55,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 447. [2021-05-22 02:25:55,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.123318385650224) internal successors, (1393), 446 states have internal predecessors, (1393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1393 transitions. [2021-05-22 02:25:55,815 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1393 transitions. Word has length 21 [2021-05-22 02:25:55,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:55,815 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1393 transitions. [2021-05-22 02:25:55,815 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:55,815 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1393 transitions. [2021-05-22 02:25:55,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:55,815 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:55,815 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:56,016 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1839,391 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:56,016 INFO L430 AbstractCegarLoop]: === Iteration 403 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:56,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:56,016 INFO L82 PathProgramCache]: Analyzing trace with hash -1661990353, now seen corresponding path program 391 times [2021-05-22 02:25:56,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:56,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926344221] [2021-05-22 02:25:56,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:56,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:56,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:56,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926344221] [2021-05-22 02:25:56,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1926344221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:56,100 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939152233] [2021-05-22 02:25:56,100 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 392 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 392 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:56,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:56,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:56,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:56,186 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,186 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:56,187 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:56,190 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,203 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:56,204 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:56,204 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:56,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:56,303 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,304 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:56,305 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:56,321 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:56,321 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:56,335 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:56,335 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:25:56,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939152233] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:56,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:56,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:25:56,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488682246] [2021-05-22 02:25:56,365 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:25:56,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:56,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:25:56,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:25:56,365 INFO L87 Difference]: Start difference. First operand 447 states and 1393 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:56,556 INFO L93 Difference]: Finished difference Result 604 states and 1834 transitions. [2021-05-22 02:25:56,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:25:56,556 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:56,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:56,557 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:25:56,557 INFO L226 Difference]: Without dead ends: 577 [2021-05-22 02:25:56,557 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 192.6ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:56,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-05-22 02:25:56,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 460. [2021-05-22 02:25:56,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1198257080610023) internal successors, (1432), 459 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1432 transitions. [2021-05-22 02:25:56,562 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1432 transitions. Word has length 21 [2021-05-22 02:25:56,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:56,562 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1432 transitions. [2021-05-22 02:25:56,563 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:56,563 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1432 transitions. [2021-05-22 02:25:56,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:56,563 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:56,563 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:56,763 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 392 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1845 [2021-05-22 02:25:56,764 INFO L430 AbstractCegarLoop]: === Iteration 404 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:56,764 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:56,764 INFO L82 PathProgramCache]: Analyzing trace with hash 24401487, now seen corresponding path program 392 times [2021-05-22 02:25:56,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:56,764 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1037608827] [2021-05-22 02:25:56,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:56,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:56,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:56,863 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:56,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1037608827] [2021-05-22 02:25:56,863 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1037608827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:56,863 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [285862454] [2021-05-22 02:25:56,863 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 393 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 393 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:56,887 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:56,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:56,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:56,888 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:56,956 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,956 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:56,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:56,957 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:56,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:56,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:56,974 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:56,974 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:57,069 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:57,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:57,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:57,078 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:57,079 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:57,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:57,080 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:57,086 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:57,087 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:25:57,087 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:25:57,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [285862454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:57,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:57,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:57,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364293973] [2021-05-22 02:25:57,117 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:57,117 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:57,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:57,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:57,117 INFO L87 Difference]: Start difference. First operand 460 states and 1432 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:57,583 INFO L93 Difference]: Finished difference Result 636 states and 1940 transitions. [2021-05-22 02:25:57,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:57,583 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:57,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:57,584 INFO L225 Difference]: With dead ends: 636 [2021-05-22 02:25:57,584 INFO L226 Difference]: Without dead ends: 615 [2021-05-22 02:25:57,584 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 405.7ms TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:57,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-05-22 02:25:57,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 450. [2021-05-22 02:25:57,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.129175946547884) internal successors, (1405), 449 states have internal predecessors, (1405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1405 transitions. [2021-05-22 02:25:57,589 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1405 transitions. Word has length 21 [2021-05-22 02:25:57,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:57,589 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1405 transitions. [2021-05-22 02:25:57,589 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:57,589 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1405 transitions. [2021-05-22 02:25:57,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:57,590 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:57,590 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:57,790 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 393 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1860 [2021-05-22 02:25:57,790 INFO L430 AbstractCegarLoop]: === Iteration 405 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:57,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:57,790 INFO L82 PathProgramCache]: Analyzing trace with hash 46905859, now seen corresponding path program 393 times [2021-05-22 02:25:57,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:57,791 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1051429691] [2021-05-22 02:25:57,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:57,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:57,880 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:57,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:57,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1051429691] [2021-05-22 02:25:57,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1051429691] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:57,880 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2098808848] [2021-05-22 02:25:57,880 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 394 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 394 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:57,905 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:25:57,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:57,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:57,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:57,956 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:57,956 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:57,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:57,957 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:57,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:57,960 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:57,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:57,978 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:57,978 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:25:58,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:58,021 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,023 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:58,024 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,040 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:58,042 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:25:58,042 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:58,059 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:58,059 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:25:58,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:58,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2098808848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:58,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:58,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:25:58,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [457873994] [2021-05-22 02:25:58,092 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:25:58,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:58,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:25:58,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:58,093 INFO L87 Difference]: Start difference. First operand 450 states and 1405 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:58,260 INFO L93 Difference]: Finished difference Result 576 states and 1776 transitions. [2021-05-22 02:25:58,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:25:58,260 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:58,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:58,261 INFO L225 Difference]: With dead ends: 576 [2021-05-22 02:25:58,261 INFO L226 Difference]: Without dead ends: 547 [2021-05-22 02:25:58,261 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 146.2ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:25:58,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-05-22 02:25:58,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 450. [2021-05-22 02:25:58,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.129175946547884) internal successors, (1405), 449 states have internal predecessors, (1405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1405 transitions. [2021-05-22 02:25:58,267 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1405 transitions. Word has length 21 [2021-05-22 02:25:58,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:58,267 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1405 transitions. [2021-05-22 02:25:58,267 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:58,267 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1405 transitions. [2021-05-22 02:25:58,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:58,268 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:58,268 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:58,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 394 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1870 [2021-05-22 02:25:58,473 INFO L430 AbstractCegarLoop]: === Iteration 406 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:58,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:58,473 INFO L82 PathProgramCache]: Analyzing trace with hash 344172269, now seen corresponding path program 394 times [2021-05-22 02:25:58,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:58,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636819529] [2021-05-22 02:25:58,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:58,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:58,593 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:58,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:58,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636819529] [2021-05-22 02:25:58,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636819529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:58,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940346389] [2021-05-22 02:25:58,594 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 395 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 395 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:58,627 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:25:58,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:58,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:58,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:58,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:58,671 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:58,680 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:25:58,680 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:25:58,726 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:58,728 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:25:58,731 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:58,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:58,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:58,751 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:58,767 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:58,767 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:58,767 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:25:58,838 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:58,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940346389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:58,838 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:58,838 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:58,838 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991813046] [2021-05-22 02:25:58,838 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:58,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:58,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:58,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:58,838 INFO L87 Difference]: Start difference. First operand 450 states and 1405 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:59,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:25:59,171 INFO L93 Difference]: Finished difference Result 644 states and 1975 transitions. [2021-05-22 02:25:59,171 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:25:59,171 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:25:59,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:25:59,172 INFO L225 Difference]: With dead ends: 644 [2021-05-22 02:25:59,172 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:25:59,172 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 289.1ms TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:25:59,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:25:59,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 449. [2021-05-22 02:25:59,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.138392857142857) internal successors, (1406), 448 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:59,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1406 transitions. [2021-05-22 02:25:59,177 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1406 transitions. Word has length 21 [2021-05-22 02:25:59,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:25:59,177 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1406 transitions. [2021-05-22 02:25:59,177 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:25:59,177 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1406 transitions. [2021-05-22 02:25:59,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:25:59,177 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:25:59,177 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:25:59,378 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1876,395 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:59,378 INFO L430 AbstractCegarLoop]: === Iteration 407 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:25:59,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:25:59,378 INFO L82 PathProgramCache]: Analyzing trace with hash 59909585, now seen corresponding path program 395 times [2021-05-22 02:25:59,378 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:25:59,378 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849628187] [2021-05-22 02:25:59,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:25:59,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:25:59,480 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:59,480 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:25:59,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849628187] [2021-05-22 02:25:59,480 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849628187] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:59,480 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389154574] [2021-05-22 02:25:59,480 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 396 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 396 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:25:59,505 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:25:59,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:25:59,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:25:59,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:25:59,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:59,566 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:59,567 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:25:59,567 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:59,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:59,570 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:59,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:59,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:25:59,584 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:25:59,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:25:59,629 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:59,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:59,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:25:59,632 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:59,649 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:59,651 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:25:59,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:25:59,652 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:25:59,668 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:25:59,669 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:25:59,669 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:25:59,744 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:25:59,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389154574] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:25:59,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:25:59,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:25:59,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086830468] [2021-05-22 02:25:59,745 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:25:59,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:25:59,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:25:59,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:25:59,745 INFO L87 Difference]: Start difference. First operand 449 states and 1406 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:00,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:00,260 INFO L93 Difference]: Finished difference Result 734 states and 2236 transitions. [2021-05-22 02:26:00,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:26:00,260 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:00,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:00,261 INFO L225 Difference]: With dead ends: 734 [2021-05-22 02:26:00,261 INFO L226 Difference]: Without dead ends: 707 [2021-05-22 02:26:00,261 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 476.7ms TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:26:00,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 707 states. [2021-05-22 02:26:00,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 707 to 460. [2021-05-22 02:26:00,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1416122004357296) internal successors, (1442), 459 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:00,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1442 transitions. [2021-05-22 02:26:00,271 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1442 transitions. Word has length 21 [2021-05-22 02:26:00,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:00,271 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1442 transitions. [2021-05-22 02:26:00,271 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:00,272 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1442 transitions. [2021-05-22 02:26:00,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:00,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:00,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:00,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 396 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1885 [2021-05-22 02:26:00,472 INFO L430 AbstractCegarLoop]: === Iteration 408 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:00,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:00,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2135599375, now seen corresponding path program 396 times [2021-05-22 02:26:00,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:00,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1802206961] [2021-05-22 02:26:00,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:00,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:00,571 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:00,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:00,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1802206961] [2021-05-22 02:26:00,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1802206961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:00,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204286716] [2021-05-22 02:26:00,571 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 397 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 397 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:00,597 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:00,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:00,597 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:00,598 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:00,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:00,659 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:00,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:00,661 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:00,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:00,663 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:00,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:00,678 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:00,678 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:26:00,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:00,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:00,736 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:00,745 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:00,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:00,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:00,747 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:00,755 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:00,756 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:00,756 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:10 [2021-05-22 02:26:00,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:00,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204286716] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:00,801 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:00,801 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:00,801 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064114381] [2021-05-22 02:26:00,801 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:00,802 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:00,802 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:00,802 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:00,802 INFO L87 Difference]: Start difference. First operand 460 states and 1442 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:01,144 INFO L93 Difference]: Finished difference Result 641 states and 1961 transitions. [2021-05-22 02:26:01,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:01,144 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:01,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:01,145 INFO L225 Difference]: With dead ends: 641 [2021-05-22 02:26:01,145 INFO L226 Difference]: Without dead ends: 620 [2021-05-22 02:26:01,145 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 329.0ms TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:26:01,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 620 states. [2021-05-22 02:26:01,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 620 to 443. [2021-05-22 02:26:01,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 442 states have (on average 3.1199095022624435) internal successors, (1379), 442 states have internal predecessors, (1379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 1379 transitions. [2021-05-22 02:26:01,150 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 1379 transitions. Word has length 21 [2021-05-22 02:26:01,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:01,150 INFO L482 AbstractCegarLoop]: Abstraction has 443 states and 1379 transitions. [2021-05-22 02:26:01,150 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,150 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 1379 transitions. [2021-05-22 02:26:01,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:01,151 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:01,151 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:01,351 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 397 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1900 [2021-05-22 02:26:01,351 INFO L430 AbstractCegarLoop]: === Iteration 409 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:01,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:01,351 INFO L82 PathProgramCache]: Analyzing trace with hash 809905741, now seen corresponding path program 397 times [2021-05-22 02:26:01,352 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:01,352 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683475881] [2021-05-22 02:26:01,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:01,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:01,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:01,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:01,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683475881] [2021-05-22 02:26:01,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683475881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:01,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724151972] [2021-05-22 02:26:01,438 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 398 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 398 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:01,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:01,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:01,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:01,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:01,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:01,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:01,520 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:01,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:01,522 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:01,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:01,539 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:01,539 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:26:01,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:01,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:01,640 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:01,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:01,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:01,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:01,649 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:01,654 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:01,655 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:01,655 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:9 [2021-05-22 02:26:01,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:01,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724151972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:01,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:01,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:26:01,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122422189] [2021-05-22 02:26:01,663 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:26:01,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:01,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:26:01,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:01,664 INFO L87 Difference]: Start difference. First operand 443 states and 1379 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:01,851 INFO L93 Difference]: Finished difference Result 530 states and 1631 transitions. [2021-05-22 02:26:01,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:01,852 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:01,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:01,852 INFO L225 Difference]: With dead ends: 530 [2021-05-22 02:26:01,852 INFO L226 Difference]: Without dead ends: 508 [2021-05-22 02:26:01,852 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 162.2ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:01,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-05-22 02:26:01,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 454. [2021-05-22 02:26:01,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1324503311258276) internal successors, (1419), 453 states have internal predecessors, (1419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1419 transitions. [2021-05-22 02:26:01,857 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1419 transitions. Word has length 21 [2021-05-22 02:26:01,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:01,857 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1419 transitions. [2021-05-22 02:26:01,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:01,857 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1419 transitions. [2021-05-22 02:26:01,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:01,858 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:01,858 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:02,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 398 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1907 [2021-05-22 02:26:02,058 INFO L430 AbstractCegarLoop]: === Iteration 410 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:02,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:02,058 INFO L82 PathProgramCache]: Analyzing trace with hash 308114405, now seen corresponding path program 398 times [2021-05-22 02:26:02,059 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:02,059 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608470983] [2021-05-22 02:26:02,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:02,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:02,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:02,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:02,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608470983] [2021-05-22 02:26:02,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608470983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:02,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [37459968] [2021-05-22 02:26:02,147 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 399 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 399 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:02,172 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:02,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:02,173 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:02,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:02,228 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:02,230 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:02,233 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:02,249 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:26:02,316 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:02,318 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,325 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,327 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:02,328 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,335 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,336 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:12 [2021-05-22 02:26:02,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:02,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [37459968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:02,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:02,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:02,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918387848] [2021-05-22 02:26:02,349 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:02,349 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:02,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:02,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:02,349 INFO L87 Difference]: Start difference. First operand 454 states and 1419 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:02,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:02,510 INFO L93 Difference]: Finished difference Result 539 states and 1655 transitions. [2021-05-22 02:26:02,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:02,510 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:02,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:02,511 INFO L225 Difference]: With dead ends: 539 [2021-05-22 02:26:02,511 INFO L226 Difference]: Without dead ends: 517 [2021-05-22 02:26:02,511 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 149.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:02,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-05-22 02:26:02,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 451. [2021-05-22 02:26:02,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.1266666666666665) internal successors, (1407), 450 states have internal predecessors, (1407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:02,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1407 transitions. [2021-05-22 02:26:02,516 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1407 transitions. Word has length 21 [2021-05-22 02:26:02,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:02,516 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1407 transitions. [2021-05-22 02:26:02,516 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:02,516 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1407 transitions. [2021-05-22 02:26:02,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:02,516 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:02,516 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:02,716 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1915,399 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:02,717 INFO L430 AbstractCegarLoop]: === Iteration 411 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:02,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:02,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1435229859, now seen corresponding path program 399 times [2021-05-22 02:26:02,717 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:02,717 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566921070] [2021-05-22 02:26:02,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:02,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:02,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:02,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:02,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566921070] [2021-05-22 02:26:02,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566921070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:02,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787679287] [2021-05-22 02:26:02,824 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 400 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 400 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:02,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:02,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:02,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:02,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:02,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:02,895 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:02,897 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:02,909 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:26:02,978 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:02,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:02,980 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,985 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:02,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:02,987 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:02,992 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:02,992 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:26:03,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:03,021 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787679287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:03,021 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:03,021 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:03,021 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908032894] [2021-05-22 02:26:03,021 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:03,021 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:03,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:03,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:03,022 INFO L87 Difference]: Start difference. First operand 451 states and 1407 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:03,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:03,348 INFO L93 Difference]: Finished difference Result 641 states and 1968 transitions. [2021-05-22 02:26:03,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:03,349 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:03,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:03,349 INFO L225 Difference]: With dead ends: 641 [2021-05-22 02:26:03,349 INFO L226 Difference]: Without dead ends: 622 [2021-05-22 02:26:03,350 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 303.5ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:03,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-05-22 02:26:03,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 461. [2021-05-22 02:26:03,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.143478260869565) internal successors, (1446), 460 states have internal predecessors, (1446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:03,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1446 transitions. [2021-05-22 02:26:03,354 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1446 transitions. Word has length 21 [2021-05-22 02:26:03,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:03,355 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1446 transitions. [2021-05-22 02:26:03,355 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:03,355 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1446 transitions. [2021-05-22 02:26:03,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:03,355 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:03,355 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:03,555 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 400 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1919 [2021-05-22 02:26:03,556 INFO L430 AbstractCegarLoop]: === Iteration 412 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:03,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:03,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1213021247, now seen corresponding path program 400 times [2021-05-22 02:26:03,556 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:03,556 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [450507934] [2021-05-22 02:26:03,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:03,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:03,654 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:03,654 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:03,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [450507934] [2021-05-22 02:26:03,654 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [450507934] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:03,654 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [20505777] [2021-05-22 02:26:03,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 401 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 401 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:03,678 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:03,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:03,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:03,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:03,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:03,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:03,718 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:03,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:03,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:03,724 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:26:03,788 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:03,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:03,791 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:03,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:03,793 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:03,802 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:03,804 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:03,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:03,805 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:03,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:03,814 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:03,814 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:5 [2021-05-22 02:26:03,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:03,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [20505777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:03,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:03,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:03,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1189975201] [2021-05-22 02:26:03,840 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:03,840 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:03,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:03,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:03,841 INFO L87 Difference]: Start difference. First operand 461 states and 1446 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:04,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:04,125 INFO L93 Difference]: Finished difference Result 734 states and 2238 transitions. [2021-05-22 02:26:04,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:04,125 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:04,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:04,126 INFO L225 Difference]: With dead ends: 734 [2021-05-22 02:26:04,126 INFO L226 Difference]: Without dead ends: 674 [2021-05-22 02:26:04,126 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 247.0ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:04,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-22 02:26:04,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 461. [2021-05-22 02:26:04,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.132608695652174) internal successors, (1441), 460 states have internal predecessors, (1441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:04,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1441 transitions. [2021-05-22 02:26:04,131 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1441 transitions. Word has length 21 [2021-05-22 02:26:04,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:04,131 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1441 transitions. [2021-05-22 02:26:04,131 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:04,131 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1441 transitions. [2021-05-22 02:26:04,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:04,132 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:04,132 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:04,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1925,401 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:04,333 INFO L430 AbstractCegarLoop]: === Iteration 413 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:04,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:04,333 INFO L82 PathProgramCache]: Analyzing trace with hash -1173345597, now seen corresponding path program 401 times [2021-05-22 02:26:04,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:04,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332495222] [2021-05-22 02:26:04,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:04,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:04,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:04,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:04,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332495222] [2021-05-22 02:26:04,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332495222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:04,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851235054] [2021-05-22 02:26:04,441 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 402 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 402 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:04,466 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:04,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:04,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:04,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:04,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:04,511 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:04,514 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:04,517 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:04,520 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:04,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:26:04,551 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:113, output treesize:81 [2021-05-22 02:26:04,649 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:04,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:26:04,652 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:04,655 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:04,658 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:04,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:26:04,681 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:04,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:04,684 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:04,702 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:04,703 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:26:04,703 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 3 variables, input treesize:93, output treesize:26 [2021-05-22 02:26:04,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:04,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851235054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:04,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:04,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:04,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274548936] [2021-05-22 02:26:04,777 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:04,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:04,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:04,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:04,777 INFO L87 Difference]: Start difference. First operand 461 states and 1441 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:05,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:05,167 INFO L93 Difference]: Finished difference Result 745 states and 2283 transitions. [2021-05-22 02:26:05,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:26:05,167 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:05,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:05,168 INFO L225 Difference]: With dead ends: 745 [2021-05-22 02:26:05,168 INFO L226 Difference]: Without dead ends: 722 [2021-05-22 02:26:05,168 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 378.5ms TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:05,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-05-22 02:26:05,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 465. [2021-05-22 02:26:05,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1314655172413794) internal successors, (1453), 464 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:05,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1453 transitions. [2021-05-22 02:26:05,174 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1453 transitions. Word has length 21 [2021-05-22 02:26:05,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:05,174 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1453 transitions. [2021-05-22 02:26:05,174 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:05,174 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1453 transitions. [2021-05-22 02:26:05,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:05,174 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:05,174 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:05,375 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 402 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1932 [2021-05-22 02:26:05,375 INFO L430 AbstractCegarLoop]: === Iteration 414 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:05,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:05,375 INFO L82 PathProgramCache]: Analyzing trace with hash 1123493317, now seen corresponding path program 402 times [2021-05-22 02:26:05,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:05,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1591772949] [2021-05-22 02:26:05,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:05,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:05,477 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:05,477 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:05,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1591772949] [2021-05-22 02:26:05,477 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1591772949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:05,477 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137148721] [2021-05-22 02:26:05,477 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 403 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 403 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:05,503 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:26:05,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:05,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:05,503 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:05,569 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[v_prenex_63]} [2021-05-22 02:26:05,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:05,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:05,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:05,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:05,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:05,588 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:05,600 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:05,601 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:05,601 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:26:05,672 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:05,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:05,673 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:05,681 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:05,682 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:05,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:05,683 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:05,689 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:05,690 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:05,690 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:26:05,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:05,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1137148721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:05,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:05,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:05,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401660003] [2021-05-22 02:26:05,733 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:05,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:05,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:05,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:05,733 INFO L87 Difference]: Start difference. First operand 465 states and 1453 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:06,080 INFO L93 Difference]: Finished difference Result 649 states and 1987 transitions. [2021-05-22 02:26:06,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:06,080 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:06,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:06,081 INFO L225 Difference]: With dead ends: 649 [2021-05-22 02:26:06,081 INFO L226 Difference]: Without dead ends: 630 [2021-05-22 02:26:06,081 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 298.7ms TimeCoverageRelationStatistics Valid=88, Invalid=374, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:26:06,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-05-22 02:26:06,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 461. [2021-05-22 02:26:06,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.123913043478261) internal successors, (1437), 460 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1437 transitions. [2021-05-22 02:26:06,086 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1437 transitions. Word has length 21 [2021-05-22 02:26:06,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:06,086 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1437 transitions. [2021-05-22 02:26:06,086 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,086 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1437 transitions. [2021-05-22 02:26:06,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:06,087 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:06,087 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:06,287 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1946,403 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:06,287 INFO L430 AbstractCegarLoop]: === Iteration 415 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:06,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:06,287 INFO L82 PathProgramCache]: Analyzing trace with hash -605468571, now seen corresponding path program 403 times [2021-05-22 02:26:06,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:06,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272106058] [2021-05-22 02:26:06,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:06,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:06,383 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:06,383 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:06,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272106058] [2021-05-22 02:26:06,383 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272106058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:06,383 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803506306] [2021-05-22 02:26:06,383 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 404 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 404 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:06,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:06,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:06,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:06,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:06,453 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:06,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:06,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:06,456 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:06,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:06,468 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:06,468 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:26:06,526 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:06,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:06,529 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:06,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:06,531 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:06,544 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:06,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:06,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:06,546 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:06,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:06,558 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:06,558 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:26:06,584 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:06,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803506306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:06,584 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:06,584 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:26:06,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346284281] [2021-05-22 02:26:06,584 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:26:06,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:06,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:26:06,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:06,585 INFO L87 Difference]: Start difference. First operand 461 states and 1437 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:06,774 INFO L93 Difference]: Finished difference Result 585 states and 1803 transitions. [2021-05-22 02:26:06,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:06,774 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:06,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:06,775 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:26:06,775 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:26:06,775 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 161.1ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:06,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:26:06,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 461. [2021-05-22 02:26:06,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.123913043478261) internal successors, (1437), 460 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1437 transitions. [2021-05-22 02:26:06,780 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1437 transitions. Word has length 21 [2021-05-22 02:26:06,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:06,780 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1437 transitions. [2021-05-22 02:26:06,780 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:06,780 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1437 transitions. [2021-05-22 02:26:06,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:06,781 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:06,781 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:06,981 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1951,404 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:06,981 INFO L430 AbstractCegarLoop]: === Iteration 416 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:06,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:06,981 INFO L82 PathProgramCache]: Analyzing trace with hash -1700167489, now seen corresponding path program 404 times [2021-05-22 02:26:06,981 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:06,981 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997241312] [2021-05-22 02:26:06,981 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:06,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:07,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:07,064 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:07,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997241312] [2021-05-22 02:26:07,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997241312] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:07,064 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434058769] [2021-05-22 02:26:07,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 405 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 405 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:07,089 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:07,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:07,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:07,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:07,138 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:07,139 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,147 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,148 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:07,148 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:26:07,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:07,229 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,231 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:07,232 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,246 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:07,249 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,263 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,264 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:07,264 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:26:07,282 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:07,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434058769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:07,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:07,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:07,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722493407] [2021-05-22 02:26:07,282 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:07,283 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:07,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:07,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:07,283 INFO L87 Difference]: Start difference. First operand 461 states and 1437 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:07,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:07,469 INFO L93 Difference]: Finished difference Result 548 states and 1686 transitions. [2021-05-22 02:26:07,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:07,469 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:07,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:07,470 INFO L225 Difference]: With dead ends: 548 [2021-05-22 02:26:07,470 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:26:07,470 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 146.4ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:07,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:26:07,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 458. [2021-05-22 02:26:07,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1269146608315097) internal successors, (1429), 457 states have internal predecessors, (1429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:07,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1429 transitions. [2021-05-22 02:26:07,475 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1429 transitions. Word has length 21 [2021-05-22 02:26:07,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:07,475 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1429 transitions. [2021-05-22 02:26:07,475 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:07,475 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1429 transitions. [2021-05-22 02:26:07,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:07,475 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:07,475 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:07,675 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 405 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1960 [2021-05-22 02:26:07,676 INFO L430 AbstractCegarLoop]: === Iteration 417 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:07,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:07,676 INFO L82 PathProgramCache]: Analyzing trace with hash 1970514043, now seen corresponding path program 405 times [2021-05-22 02:26:07,676 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:07,676 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [868203487] [2021-05-22 02:26:07,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:07,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:07,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:07,765 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:07,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [868203487] [2021-05-22 02:26:07,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [868203487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:07,765 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804340565] [2021-05-22 02:26:07,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 406 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 406 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:07,791 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:07,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:07,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:07,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:07,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:07,847 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:07,850 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,866 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:07,866 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:26:07,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:07,913 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:07,916 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,932 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,934 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:07,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:07,935 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:07,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:07,950 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:07,950 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:66, output treesize:21 [2021-05-22 02:26:07,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:07,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804340565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:07,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:07,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:07,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523407309] [2021-05-22 02:26:07,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:07,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:07,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:07,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:07,985 INFO L87 Difference]: Start difference. First operand 458 states and 1429 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:08,147 INFO L93 Difference]: Finished difference Result 588 states and 1811 transitions. [2021-05-22 02:26:08,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:08,147 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:08,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:08,148 INFO L225 Difference]: With dead ends: 588 [2021-05-22 02:26:08,148 INFO L226 Difference]: Without dead ends: 559 [2021-05-22 02:26:08,148 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 148.9ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:08,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2021-05-22 02:26:08,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 458. [2021-05-22 02:26:08,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1269146608315097) internal successors, (1429), 457 states have internal predecessors, (1429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1429 transitions. [2021-05-22 02:26:08,153 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1429 transitions. Word has length 21 [2021-05-22 02:26:08,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:08,153 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1429 transitions. [2021-05-22 02:26:08,153 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,153 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1429 transitions. [2021-05-22 02:26:08,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:08,154 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:08,154 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:08,354 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 406 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1971 [2021-05-22 02:26:08,354 INFO L430 AbstractCegarLoop]: === Iteration 418 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:08,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:08,354 INFO L82 PathProgramCache]: Analyzing trace with hash -2027186843, now seen corresponding path program 406 times [2021-05-22 02:26:08,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:08,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780646476] [2021-05-22 02:26:08,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:08,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:08,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:08,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:08,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780646476] [2021-05-22 02:26:08,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780646476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:08,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1189473637] [2021-05-22 02:26:08,446 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 407 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 407 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:08,489 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:08,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:08,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:08,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:08,557 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_64], 1=[o_0]} [2021-05-22 02:26:08,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:08,560 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:08,574 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:08,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:08,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:08,577 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:08,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:08,590 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:08,590 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:26:08,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:08,633 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:08,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:08,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:08,636 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:08,652 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:08,654 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:08,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:08,655 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:08,669 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:08,670 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:08,670 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:62, output treesize:19 [2021-05-22 02:26:08,693 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:08,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1189473637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:08,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:08,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:08,694 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372610826] [2021-05-22 02:26:08,694 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:08,694 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:08,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:08,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:08,694 INFO L87 Difference]: Start difference. First operand 458 states and 1429 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,919 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:08,919 INFO L93 Difference]: Finished difference Result 647 states and 1973 transitions. [2021-05-22 02:26:08,920 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:08,920 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:08,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:08,921 INFO L225 Difference]: With dead ends: 647 [2021-05-22 02:26:08,921 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:26:08,921 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 157.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:08,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:26:08,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 462. [2021-05-22 02:26:08,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1453362255965294) internal successors, (1450), 461 states have internal predecessors, (1450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1450 transitions. [2021-05-22 02:26:08,926 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1450 transitions. Word has length 21 [2021-05-22 02:26:08,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:08,926 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1450 transitions. [2021-05-22 02:26:08,926 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:08,926 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1450 transitions. [2021-05-22 02:26:08,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:08,926 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:08,926 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:09,127 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 407 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1977 [2021-05-22 02:26:09,127 INFO L430 AbstractCegarLoop]: === Iteration 419 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:09,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:09,127 INFO L82 PathProgramCache]: Analyzing trace with hash 1983517769, now seen corresponding path program 407 times [2021-05-22 02:26:09,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:09,127 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955513021] [2021-05-22 02:26:09,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:09,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:09,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:09,222 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:09,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955513021] [2021-05-22 02:26:09,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955513021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:09,222 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [66535618] [2021-05-22 02:26:09,222 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 408 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 408 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:09,247 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:09,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:09,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:09,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:09,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:09,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:09,296 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:09,304 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:09,305 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:09,305 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:26:09,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:09,352 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:09,354 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:09,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:09,355 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:09,372 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:09,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:09,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:09,375 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:09,391 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:09,393 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:09,393 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:26:09,468 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:09,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [66535618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:09,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:09,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:09,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219798094] [2021-05-22 02:26:09,468 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:09,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:09,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:09,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:09,469 INFO L87 Difference]: Start difference. First operand 462 states and 1450 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:09,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:09,860 INFO L93 Difference]: Finished difference Result 635 states and 1951 transitions. [2021-05-22 02:26:09,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:09,860 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:09,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:09,861 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:26:09,861 INFO L226 Difference]: Without dead ends: 608 [2021-05-22 02:26:09,862 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 334.9ms TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:09,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-05-22 02:26:09,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 460. [2021-05-22 02:26:09,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1350762527233114) internal successors, (1439), 459 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:09,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1439 transitions. [2021-05-22 02:26:09,867 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1439 transitions. Word has length 21 [2021-05-22 02:26:09,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:09,867 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1439 transitions. [2021-05-22 02:26:09,867 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:09,867 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1439 transitions. [2021-05-22 02:26:09,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:09,867 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:09,867 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:10,067 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1985,408 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:10,068 INFO L430 AbstractCegarLoop]: === Iteration 420 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:10,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:10,068 INFO L82 PathProgramCache]: Analyzing trace with hash 559407445, now seen corresponding path program 408 times [2021-05-22 02:26:10,068 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:10,068 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1758665023] [2021-05-22 02:26:10,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:10,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:10,174 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:10,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:10,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1758665023] [2021-05-22 02:26:10,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1758665023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:10,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406415513] [2021-05-22 02:26:10,174 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 409 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 409 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:10,199 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:10,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:10,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:10,199 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:10,261 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:10,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:10,262 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:10,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:10,267 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:10,267 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:26:10,303 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:10,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:10,305 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:10,310 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:10,312 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:10,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:10,313 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:10,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:10,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:10,317 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:26:10,343 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:10,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406415513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:10,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:10,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:10,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263469126] [2021-05-22 02:26:10,343 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:10,344 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:10,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:10,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:10,344 INFO L87 Difference]: Start difference. First operand 460 states and 1439 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:10,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:10,657 INFO L93 Difference]: Finished difference Result 656 states and 2007 transitions. [2021-05-22 02:26:10,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:10,657 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:10,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:10,658 INFO L225 Difference]: With dead ends: 656 [2021-05-22 02:26:10,658 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:26:10,658 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 279.9ms TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:10,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:26:10,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 464. [2021-05-22 02:26:10,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1339092872570196) internal successors, (1451), 463 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:10,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1451 transitions. [2021-05-22 02:26:10,663 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1451 transitions. Word has length 21 [2021-05-22 02:26:10,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:10,663 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1451 transitions. [2021-05-22 02:26:10,663 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:10,663 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1451 transitions. [2021-05-22 02:26:10,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:10,664 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:10,664 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:10,864 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 409 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1997 [2021-05-22 02:26:10,864 INFO L430 AbstractCegarLoop]: === Iteration 421 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:10,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:10,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1474229035, now seen corresponding path program 409 times [2021-05-22 02:26:10,864 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:10,865 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544182600] [2021-05-22 02:26:10,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:10,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:10,967 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:10,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:10,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544182600] [2021-05-22 02:26:10,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544182600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:10,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296845293] [2021-05-22 02:26:10,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 410 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 410 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:10,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:10,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:11,075 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:11,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:11,076 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,082 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,083 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:11,083 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:22 [2021-05-22 02:26:11,118 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:11,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:11,119 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,127 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,128 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:11,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:11,129 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,136 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,136 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,136 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:26:11,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:11,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [296845293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:11,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:11,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:11,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847278606] [2021-05-22 02:26:11,179 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:11,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:11,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:11,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:11,179 INFO L87 Difference]: Start difference. First operand 464 states and 1451 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:11,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:11,511 INFO L93 Difference]: Finished difference Result 642 states and 1970 transitions. [2021-05-22 02:26:11,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:11,511 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:11,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:11,512 INFO L225 Difference]: With dead ends: 642 [2021-05-22 02:26:11,512 INFO L226 Difference]: Without dead ends: 623 [2021-05-22 02:26:11,512 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 319.9ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:11,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2021-05-22 02:26:11,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 451. [2021-05-22 02:26:11,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.117777777777778) internal successors, (1403), 450 states have internal predecessors, (1403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:11,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1403 transitions. [2021-05-22 02:26:11,517 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1403 transitions. Word has length 21 [2021-05-22 02:26:11,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:11,517 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1403 transitions. [2021-05-22 02:26:11,517 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:11,517 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1403 transitions. [2021-05-22 02:26:11,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:11,517 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:11,518 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:11,718 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 410 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1999 [2021-05-22 02:26:11,718 INFO L430 AbstractCegarLoop]: === Iteration 422 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:11,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:11,718 INFO L82 PathProgramCache]: Analyzing trace with hash -855966867, now seen corresponding path program 410 times [2021-05-22 02:26:11,718 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:11,718 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1647992452] [2021-05-22 02:26:11,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:11,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:11,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:11,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:11,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1647992452] [2021-05-22 02:26:11,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1647992452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:11,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863384529] [2021-05-22 02:26:11,821 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 411 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 411 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:11,846 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:11,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:11,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:11,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:11,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:11,908 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,914 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,915 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:11,915 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:26:11,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:11,938 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:11,938 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,944 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:11,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:11,947 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:11,953 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:11,953 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:26:11,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:11,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863384529] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:11,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:11,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:11,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115503785] [2021-05-22 02:26:11,965 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:11,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:11,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:11,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:11,966 INFO L87 Difference]: Start difference. First operand 451 states and 1403 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:12,118 INFO L93 Difference]: Finished difference Result 523 states and 1609 transitions. [2021-05-22 02:26:12,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:12,119 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:12,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:12,119 INFO L225 Difference]: With dead ends: 523 [2021-05-22 02:26:12,119 INFO L226 Difference]: Without dead ends: 504 [2021-05-22 02:26:12,119 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 146.3ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:12,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 504 states. [2021-05-22 02:26:12,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 504 to 447. [2021-05-22 02:26:12,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.118834080717489) internal successors, (1391), 446 states have internal predecessors, (1391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1391 transitions. [2021-05-22 02:26:12,124 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1391 transitions. Word has length 21 [2021-05-22 02:26:12,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:12,124 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1391 transitions. [2021-05-22 02:26:12,124 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,124 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1391 transitions. [2021-05-22 02:26:12,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:12,124 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:12,124 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:12,325 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 411 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2002 [2021-05-22 02:26:12,325 INFO L430 AbstractCegarLoop]: === Iteration 423 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:12,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:12,325 INFO L82 PathProgramCache]: Analyzing trace with hash 1380789453, now seen corresponding path program 411 times [2021-05-22 02:26:12,325 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:12,325 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187086079] [2021-05-22 02:26:12,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:12,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:12,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:12,416 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:12,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187086079] [2021-05-22 02:26:12,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [187086079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:12,416 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [767624471] [2021-05-22 02:26:12,416 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 412 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 412 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:12,441 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:12,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:12,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:12,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:12,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:12,504 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:12,510 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:12,511 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:12,511 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:25 [2021-05-22 02:26:12,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:12,543 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:12,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:12,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:12,546 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:12,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:12,560 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:12,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:12,561 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:12,572 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:12,573 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:12,573 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:26:12,590 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:12,590 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [767624471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:12,590 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:12,590 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:12,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1005305793] [2021-05-22 02:26:12,590 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:12,591 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:12,591 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:12,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:12,591 INFO L87 Difference]: Start difference. First operand 447 states and 1391 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:12,754 INFO L93 Difference]: Finished difference Result 544 states and 1671 transitions. [2021-05-22 02:26:12,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:12,755 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:12,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:12,755 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:26:12,756 INFO L226 Difference]: Without dead ends: 508 [2021-05-22 02:26:12,756 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 136.2ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:12,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2021-05-22 02:26:12,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 447. [2021-05-22 02:26:12,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.118834080717489) internal successors, (1391), 446 states have internal predecessors, (1391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1391 transitions. [2021-05-22 02:26:12,760 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1391 transitions. Word has length 21 [2021-05-22 02:26:12,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:12,760 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1391 transitions. [2021-05-22 02:26:12,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:12,760 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1391 transitions. [2021-05-22 02:26:12,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:12,761 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:12,761 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:12,961 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 412 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2004 [2021-05-22 02:26:12,961 INFO L430 AbstractCegarLoop]: === Iteration 424 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:12,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:12,961 INFO L82 PathProgramCache]: Analyzing trace with hash 286090535, now seen corresponding path program 412 times [2021-05-22 02:26:12,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:12,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834797598] [2021-05-22 02:26:12,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:12,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:13,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:13,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:13,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834797598] [2021-05-22 02:26:13,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834797598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:13,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266450093] [2021-05-22 02:26:13,050 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 413 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 413 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:13,075 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:13,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:13,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:13,076 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:13,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:13,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:13,145 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,156 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,158 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:13,158 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:25 [2021-05-22 02:26:13,192 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_65, v_prenex_66], 1=[o_0, o_4]} [2021-05-22 02:26:13,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:13,216 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,225 INFO L518 ElimStorePlain]: Eliminatee v_prenex_66 vanished before elimination [2021-05-22 02:26:13,227 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:13,228 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,236 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,237 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:13,238 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,246 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,246 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:13,247 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:26:13,274 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:13,275 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [266450093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:13,275 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:13,275 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:26:13,275 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1705633569] [2021-05-22 02:26:13,275 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:26:13,275 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:13,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:26:13,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:13,275 INFO L87 Difference]: Start difference. First operand 447 states and 1391 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:13,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:13,518 INFO L93 Difference]: Finished difference Result 585 states and 1790 transitions. [2021-05-22 02:26:13,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:13,519 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:13,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:13,520 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:26:13,520 INFO L226 Difference]: Without dead ends: 558 [2021-05-22 02:26:13,520 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 172.0ms TimeCoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:13,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2021-05-22 02:26:13,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 462. [2021-05-22 02:26:13,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.117136659436009) internal successors, (1437), 461 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:13,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1437 transitions. [2021-05-22 02:26:13,525 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1437 transitions. Word has length 21 [2021-05-22 02:26:13,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:13,525 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1437 transitions. [2021-05-22 02:26:13,525 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:13,525 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1437 transitions. [2021-05-22 02:26:13,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:13,525 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:13,525 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:13,726 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2011,413 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:13,726 INFO L430 AbstractCegarLoop]: === Iteration 425 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:13,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:13,726 INFO L82 PathProgramCache]: Analyzing trace with hash -2128123823, now seen corresponding path program 413 times [2021-05-22 02:26:13,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:13,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610797882] [2021-05-22 02:26:13,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:13,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:13,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:13,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:13,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610797882] [2021-05-22 02:26:13,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610797882] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:13,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27003647] [2021-05-22 02:26:13,818 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 414 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 414 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:13,843 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:13,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:13,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:13,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:13,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:13,913 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:13,915 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,926 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:13,928 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:25 [2021-05-22 02:26:13,971 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,972 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:13,973 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:13,976 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,994 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:13,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:13,997 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:13,999 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:13,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:14,000 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:14,017 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:14,018 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:14,018 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:67, output treesize:25 [2021-05-22 02:26:14,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:14,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27003647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:14,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:14,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:14,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9468224] [2021-05-22 02:26:14,067 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:14,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:14,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:14,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:14,067 INFO L87 Difference]: Start difference. First operand 462 states and 1437 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:14,263 INFO L93 Difference]: Finished difference Result 535 states and 1637 transitions. [2021-05-22 02:26:14,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:14,264 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:14,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:14,265 INFO L225 Difference]: With dead ends: 535 [2021-05-22 02:26:14,265 INFO L226 Difference]: Without dead ends: 514 [2021-05-22 02:26:14,265 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 216.7ms TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:26:14,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-05-22 02:26:14,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 444. [2021-05-22 02:26:14,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.1218961625282167) internal successors, (1383), 443 states have internal predecessors, (1383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1383 transitions. [2021-05-22 02:26:14,269 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1383 transitions. Word has length 21 [2021-05-22 02:26:14,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:14,269 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1383 transitions. [2021-05-22 02:26:14,269 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,269 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1383 transitions. [2021-05-22 02:26:14,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:14,270 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:14,270 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:14,470 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 414 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2023 [2021-05-22 02:26:14,470 INFO L430 AbstractCegarLoop]: === Iteration 426 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:14,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:14,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1475830781, now seen corresponding path program 414 times [2021-05-22 02:26:14,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:14,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [223301940] [2021-05-22 02:26:14,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:14,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:14,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:14,559 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:14,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [223301940] [2021-05-22 02:26:14,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [223301940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:14,560 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [519508924] [2021-05-22 02:26:14,560 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 415 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 415 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:14,585 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:14,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:14,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:14,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:14,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:14,633 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:14,640 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:14,641 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:14,641 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:26:14,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:14,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:14,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:14,675 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:14,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:14,678 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:14,693 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:14,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:14,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:14,696 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:14,711 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:14,711 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:14,711 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:21 [2021-05-22 02:26:14,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:14,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [519508924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:14,745 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:14,745 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:14,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1494151903] [2021-05-22 02:26:14,745 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:14,745 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:14,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:14,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:14,745 INFO L87 Difference]: Start difference. First operand 444 states and 1383 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:14,900 INFO L93 Difference]: Finished difference Result 559 states and 1711 transitions. [2021-05-22 02:26:14,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:14,900 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:14,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:14,901 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:26:14,901 INFO L226 Difference]: Without dead ends: 523 [2021-05-22 02:26:14,901 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 135.0ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:14,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-22 02:26:14,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 445. [2021-05-22 02:26:14,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 445 states, 444 states have (on average 3.126126126126126) internal successors, (1388), 444 states have internal predecessors, (1388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 445 states to 445 states and 1388 transitions. [2021-05-22 02:26:14,905 INFO L78 Accepts]: Start accepts. Automaton has 445 states and 1388 transitions. Word has length 21 [2021-05-22 02:26:14,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:14,905 INFO L482 AbstractCegarLoop]: Abstraction has 445 states and 1388 transitions. [2021-05-22 02:26:14,905 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:14,905 INFO L276 IsEmpty]: Start isEmpty. Operand 445 states and 1388 transitions. [2021-05-22 02:26:14,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:14,906 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:14,906 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:15,106 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2032,415 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:15,106 INFO L430 AbstractCegarLoop]: === Iteration 427 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:15,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:15,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1178564371, now seen corresponding path program 415 times [2021-05-22 02:26:15,107 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:15,107 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821351472] [2021-05-22 02:26:15,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:15,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:15,212 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:15,212 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:15,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821351472] [2021-05-22 02:26:15,212 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821351472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:15,212 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [383546524] [2021-05-22 02:26:15,212 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 416 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 416 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:15,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:15,237 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:15,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:15,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:15,285 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:15,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:15,288 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:15,302 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:15,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:15,303 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:15,336 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_68, v_prenex_67], 1=[o_0, o_4]} [2021-05-22 02:26:15,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:15,339 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:15,351 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:15,351 INFO L518 ElimStorePlain]: Eliminatee v_prenex_67 vanished before elimination [2021-05-22 02:26:15,353 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:15,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:15,355 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:15,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:15,367 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:15,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:15,368 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:15,378 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:15,379 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:15,379 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:15,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:15,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [383546524] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:15,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:15,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:15,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711961881] [2021-05-22 02:26:15,450 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:15,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:15,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:15,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:15,450 INFO L87 Difference]: Start difference. First operand 445 states and 1388 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:15,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:15,738 INFO L93 Difference]: Finished difference Result 710 states and 2167 transitions. [2021-05-22 02:26:15,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:26:15,739 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:15,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:15,740 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:26:15,740 INFO L226 Difference]: Without dead ends: 687 [2021-05-22 02:26:15,740 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 266.4ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:26:15,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-05-22 02:26:15,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 460. [2021-05-22 02:26:15,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1437908496732025) internal successors, (1443), 459 states have internal predecessors, (1443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:15,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1443 transitions. [2021-05-22 02:26:15,745 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1443 transitions. Word has length 21 [2021-05-22 02:26:15,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:15,745 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1443 transitions. [2021-05-22 02:26:15,745 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:15,745 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1443 transitions. [2021-05-22 02:26:15,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:15,746 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:15,746 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:15,946 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 416 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2036 [2021-05-22 02:26:15,946 INFO L430 AbstractCegarLoop]: === Iteration 428 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:15,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:15,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1462827055, now seen corresponding path program 416 times [2021-05-22 02:26:15,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:15,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652326996] [2021-05-22 02:26:15,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:15,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:16,044 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:16,044 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:16,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652326996] [2021-05-22 02:26:16,044 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652326996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:16,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876231176] [2021-05-22 02:26:16,044 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 417 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 417 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:16,069 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:16,069 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:16,080 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:16,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:16,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:16,129 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:16,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:16,132 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:16,146 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:16,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:16,147 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:16,180 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_4], 1=[v_prenex_70, v_prenex_69]} [2021-05-22 02:26:16,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:16,183 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:16,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:16,195 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:16,197 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:16,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:16,198 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:16,209 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:16,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:16,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:16,211 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:16,221 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:16,222 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:16,222 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:16,297 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:16,297 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1876231176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:16,297 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:16,297 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:16,297 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739758284] [2021-05-22 02:26:16,297 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:16,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:16,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:16,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:16,298 INFO L87 Difference]: Start difference. First operand 460 states and 1443 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:16,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:16,698 INFO L93 Difference]: Finished difference Result 698 states and 2124 transitions. [2021-05-22 02:26:16,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:16,699 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:16,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:16,700 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:26:16,700 INFO L226 Difference]: Without dead ends: 671 [2021-05-22 02:26:16,700 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 312.8ms TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:16,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-05-22 02:26:16,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 478. [2021-05-22 02:26:16,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.150943396226415) internal successors, (1503), 477 states have internal predecessors, (1503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:16,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1503 transitions. [2021-05-22 02:26:16,705 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1503 transitions. Word has length 21 [2021-05-22 02:26:16,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:16,705 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1503 transitions. [2021-05-22 02:26:16,705 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:16,705 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1503 transitions. [2021-05-22 02:26:16,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:16,706 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:16,706 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:16,906 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 417 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2045 [2021-05-22 02:26:16,906 INFO L430 AbstractCegarLoop]: === Iteration 429 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:16,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:16,907 INFO L82 PathProgramCache]: Analyzing trace with hash 871393275, now seen corresponding path program 417 times [2021-05-22 02:26:16,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:16,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255901764] [2021-05-22 02:26:16,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:16,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:17,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:17,011 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:17,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255901764] [2021-05-22 02:26:17,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255901764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:17,011 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087365533] [2021-05-22 02:26:17,011 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 418 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 418 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:17,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:17,036 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:17,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:17,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:17,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:17,084 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:17,087 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,102 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:17,102 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:17,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:17,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:17,150 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,156 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,157 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:17,158 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:17,158 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,164 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,164 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:26:17,209 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:17,209 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087365533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:17,209 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:17,209 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:17,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933403320] [2021-05-22 02:26:17,209 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:17,209 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:17,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:17,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:17,210 INFO L87 Difference]: Start difference. First operand 478 states and 1503 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:17,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:17,467 INFO L93 Difference]: Finished difference Result 661 states and 2031 transitions. [2021-05-22 02:26:17,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:26:17,467 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:17,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:17,468 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:26:17,468 INFO L226 Difference]: Without dead ends: 642 [2021-05-22 02:26:17,468 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 240.1ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:26:17,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 642 states. [2021-05-22 02:26:17,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 642 to 464. [2021-05-22 02:26:17,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.140388768898488) internal successors, (1454), 463 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:17,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1454 transitions. [2021-05-22 02:26:17,474 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1454 transitions. Word has length 21 [2021-05-22 02:26:17,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:17,474 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1454 transitions. [2021-05-22 02:26:17,474 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:17,474 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1454 transitions. [2021-05-22 02:26:17,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:17,474 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:17,474 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:17,675 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2057,418 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:17,675 INFO L430 AbstractCegarLoop]: === Iteration 430 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:17,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:17,675 INFO L82 PathProgramCache]: Analyzing trace with hash 1416765929, now seen corresponding path program 418 times [2021-05-22 02:26:17,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:17,675 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935238987] [2021-05-22 02:26:17,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:17,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:17,764 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:17,764 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:17,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935238987] [2021-05-22 02:26:17,764 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935238987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:17,764 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1035162199] [2021-05-22 02:26:17,764 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 419 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 419 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:17,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:17,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:17,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:17,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:17,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:17,837 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:17,839 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,853 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,854 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:17,855 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:17,934 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:17,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:17,935 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,939 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,941 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:17,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:17,941 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,946 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:17,946 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:17,946 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:26:17,956 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:17,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1035162199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:17,956 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:17,956 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:26:17,956 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262933203] [2021-05-22 02:26:17,956 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:26:17,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:17,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:26:17,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:17,956 INFO L87 Difference]: Start difference. First operand 464 states and 1454 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:18,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:18,130 INFO L93 Difference]: Finished difference Result 566 states and 1726 transitions. [2021-05-22 02:26:18,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:18,130 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:18,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:18,131 INFO L225 Difference]: With dead ends: 566 [2021-05-22 02:26:18,131 INFO L226 Difference]: Without dead ends: 545 [2021-05-22 02:26:18,131 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 172.0ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:18,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2021-05-22 02:26:18,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 460. [2021-05-22 02:26:18,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1416122004357296) internal successors, (1442), 459 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:18,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1442 transitions. [2021-05-22 02:26:18,136 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1442 transitions. Word has length 21 [2021-05-22 02:26:18,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:18,136 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1442 transitions. [2021-05-22 02:26:18,136 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:18,136 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1442 transitions. [2021-05-22 02:26:18,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:18,136 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:18,136 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:18,337 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 419 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2061 [2021-05-22 02:26:18,337 INFO L430 AbstractCegarLoop]: === Iteration 431 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:18,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:18,337 INFO L82 PathProgramCache]: Analyzing trace with hash -302218753, now seen corresponding path program 419 times [2021-05-22 02:26:18,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:18,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757590040] [2021-05-22 02:26:18,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:18,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:18,433 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:18,433 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:18,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757590040] [2021-05-22 02:26:18,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757590040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:18,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109443161] [2021-05-22 02:26:18,434 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 420 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 420 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:18,458 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:18,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:18,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:18,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:18,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:18,507 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:18,510 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,524 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:18,526 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:18,526 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:18,573 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,573 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:18,574 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:18,577 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,599 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:18,601 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:18,602 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:18,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:18,605 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:18,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:18,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:18,627 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:77, output treesize:31 [2021-05-22 02:26:18,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:18,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109443161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:18,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:18,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:18,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715959895] [2021-05-22 02:26:18,703 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:18,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:18,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:18,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:18,703 INFO L87 Difference]: Start difference. First operand 460 states and 1442 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:19,042 INFO L93 Difference]: Finished difference Result 624 states and 1923 transitions. [2021-05-22 02:26:19,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:19,042 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:19,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:19,043 INFO L225 Difference]: With dead ends: 624 [2021-05-22 02:26:19,043 INFO L226 Difference]: Without dead ends: 603 [2021-05-22 02:26:19,043 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 299.7ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:26:19,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-05-22 02:26:19,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 443. [2021-05-22 02:26:19,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 442 states have (on average 3.1199095022624435) internal successors, (1379), 442 states have internal predecessors, (1379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 1379 transitions. [2021-05-22 02:26:19,048 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 1379 transitions. Word has length 21 [2021-05-22 02:26:19,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:19,048 INFO L482 AbstractCegarLoop]: Abstraction has 443 states and 1379 transitions. [2021-05-22 02:26:19,048 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,048 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 1379 transitions. [2021-05-22 02:26:19,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:19,048 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:19,049 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:19,249 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 420 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2068 [2021-05-22 02:26:19,249 INFO L430 AbstractCegarLoop]: === Iteration 432 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:19,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:19,249 INFO L82 PathProgramCache]: Analyzing trace with hash -1465558931, now seen corresponding path program 420 times [2021-05-22 02:26:19,249 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:19,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900091297] [2021-05-22 02:26:19,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:19,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:19,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:19,340 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:19,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900091297] [2021-05-22 02:26:19,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900091297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:19,340 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [834047565] [2021-05-22 02:26:19,340 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 421 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 421 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:19,365 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:19,365 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:19,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:19,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:19,408 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:19,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:19,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:19,410 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:19,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:19,413 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:19,424 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:19,425 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:19,425 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:26:19,468 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:19,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:19,471 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:19,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:19,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:19,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:19,480 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:19,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:19,486 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:19,486 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:26:19,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:19,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [834047565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:19,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:19,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:19,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285323392] [2021-05-22 02:26:19,499 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:19,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:19,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:19,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:19,500 INFO L87 Difference]: Start difference. First operand 443 states and 1379 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:19,638 INFO L93 Difference]: Finished difference Result 523 states and 1610 transitions. [2021-05-22 02:26:19,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:19,638 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:19,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:19,639 INFO L225 Difference]: With dead ends: 523 [2021-05-22 02:26:19,639 INFO L226 Difference]: Without dead ends: 501 [2021-05-22 02:26:19,639 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 140.9ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:19,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-05-22 02:26:19,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 449. [2021-05-22 02:26:19,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.125) internal successors, (1400), 448 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1400 transitions. [2021-05-22 02:26:19,644 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1400 transitions. Word has length 21 [2021-05-22 02:26:19,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:19,644 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1400 transitions. [2021-05-22 02:26:19,644 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:19,644 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1400 transitions. [2021-05-22 02:26:19,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:19,644 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:19,644 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:19,845 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2075,421 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:19,845 INFO L430 AbstractCegarLoop]: === Iteration 433 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:19,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:19,845 INFO L82 PathProgramCache]: Analyzing trace with hash -840234813, now seen corresponding path program 421 times [2021-05-22 02:26:19,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:19,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2006429151] [2021-05-22 02:26:19,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:19,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:19,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:19,942 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:19,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2006429151] [2021-05-22 02:26:19,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2006429151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:19,943 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1347063018] [2021-05-22 02:26:19,943 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 422 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 422 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:19,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:19,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:19,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:20,007 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:20,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:20,008 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,014 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,014 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,014 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:26:20,059 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:20,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:20,062 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:20,065 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,078 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:20,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:20,079 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,090 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,091 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:20,091 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:26:20,136 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:20,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1347063018] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:20,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:20,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:20,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132582458] [2021-05-22 02:26:20,137 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:20,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:20,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:20,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:20,137 INFO L87 Difference]: Start difference. First operand 449 states and 1400 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:20,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:20,376 INFO L93 Difference]: Finished difference Result 613 states and 1885 transitions. [2021-05-22 02:26:20,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:26:20,377 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:20,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:20,377 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:26:20,378 INFO L226 Difference]: Without dead ends: 586 [2021-05-22 02:26:20,378 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 211.6ms TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:26:20,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2021-05-22 02:26:20,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 449. [2021-05-22 02:26:20,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1205357142857144) internal successors, (1398), 448 states have internal predecessors, (1398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:20,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1398 transitions. [2021-05-22 02:26:20,382 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1398 transitions. Word has length 21 [2021-05-22 02:26:20,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:20,382 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1398 transitions. [2021-05-22 02:26:20,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:20,383 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1398 transitions. [2021-05-22 02:26:20,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:20,383 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:20,383 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:20,583 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 422 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2078 [2021-05-22 02:26:20,583 INFO L430 AbstractCegarLoop]: === Iteration 434 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:20,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:20,584 INFO L82 PathProgramCache]: Analyzing trace with hash -1124497497, now seen corresponding path program 422 times [2021-05-22 02:26:20,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:20,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819306316] [2021-05-22 02:26:20,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:20,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:20,687 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:20,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:20,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819306316] [2021-05-22 02:26:20,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819306316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:20,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [491246727] [2021-05-22 02:26:20,687 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 423 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 423 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:20,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:20,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:20,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:20,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:20,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:20,756 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:20,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:20,759 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,770 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,770 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:20,770 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:26:20,826 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:20,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:20,829 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:20,831 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,843 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:20,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:20,846 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:20,857 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:20,858 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:20,858 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:26:20,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:20,907 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [491246727] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:20,907 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:20,907 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:20,907 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341528172] [2021-05-22 02:26:20,907 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:20,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:20,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:20,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:20,907 INFO L87 Difference]: Start difference. First operand 449 states and 1398 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:21,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:21,303 INFO L93 Difference]: Finished difference Result 724 states and 2210 transitions. [2021-05-22 02:26:21,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:21,303 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:21,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:21,304 INFO L225 Difference]: With dead ends: 724 [2021-05-22 02:26:21,304 INFO L226 Difference]: Without dead ends: 697 [2021-05-22 02:26:21,304 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 344.3ms TimeCoverageRelationStatistics Valid=123, Invalid=477, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:21,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2021-05-22 02:26:21,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 463. [2021-05-22 02:26:21,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.119047619047619) internal successors, (1441), 462 states have internal predecessors, (1441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:21,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1441 transitions. [2021-05-22 02:26:21,310 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1441 transitions. Word has length 21 [2021-05-22 02:26:21,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:21,310 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1441 transitions. [2021-05-22 02:26:21,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:21,310 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1441 transitions. [2021-05-22 02:26:21,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:21,310 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:21,310 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:21,510 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 423 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2082 [2021-05-22 02:26:21,511 INFO L430 AbstractCegarLoop]: === Iteration 435 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:21,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:21,511 INFO L82 PathProgramCache]: Analyzing trace with hash 561894343, now seen corresponding path program 423 times [2021-05-22 02:26:21,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:21,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24798571] [2021-05-22 02:26:21,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:21,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:21,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:21,606 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:21,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24798571] [2021-05-22 02:26:21,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24798571] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:21,606 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882838533] [2021-05-22 02:26:21,606 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 424 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 424 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:21,631 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:21,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:21,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:21,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:21,706 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_71]} [2021-05-22 02:26:21,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:21,709 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:21,723 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:21,725 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:21,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:21,726 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:21,737 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:21,739 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:21,739 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:26:21,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:21,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:21,834 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:21,840 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:21,842 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:21,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:21,843 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:21,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:21,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:21,849 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:35, output treesize:7 [2021-05-22 02:26:21,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:21,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882838533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:21,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:21,879 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:21,879 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2009392021] [2021-05-22 02:26:21,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:21,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:21,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:21,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:21,880 INFO L87 Difference]: Start difference. First operand 463 states and 1441 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:22,304 INFO L93 Difference]: Finished difference Result 644 states and 1965 transitions. [2021-05-22 02:26:22,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:22,304 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:22,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:22,305 INFO L225 Difference]: With dead ends: 644 [2021-05-22 02:26:22,305 INFO L226 Difference]: Without dead ends: 623 [2021-05-22 02:26:22,305 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 405.9ms TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:22,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2021-05-22 02:26:22,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 464. [2021-05-22 02:26:22,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.127429805615551) internal successors, (1448), 463 states have internal predecessors, (1448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1448 transitions. [2021-05-22 02:26:22,310 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1448 transitions. Word has length 21 [2021-05-22 02:26:22,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:22,310 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1448 transitions. [2021-05-22 02:26:22,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,310 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1448 transitions. [2021-05-22 02:26:22,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:22,311 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:22,311 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:22,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2093,424 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:22,511 INFO L430 AbstractCegarLoop]: === Iteration 436 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:22,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:22,511 INFO L82 PathProgramCache]: Analyzing trace with hash 584398715, now seen corresponding path program 424 times [2021-05-22 02:26:22,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:22,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292482391] [2021-05-22 02:26:22,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:22,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:22,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:22,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:22,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292482391] [2021-05-22 02:26:22,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [292482391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:22,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011935189] [2021-05-22 02:26:22,598 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 425 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 425 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:22,622 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:22,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:22,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:22,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:22,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:22,681 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:22,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:22,682 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:22,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:22,685 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:22,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:22,701 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:22,701 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:26:22,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:22,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:22,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:22,749 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:22,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:22,752 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:22,767 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:22,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:22,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:22,770 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:22,784 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:22,785 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:22,785 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:70, output treesize:21 [2021-05-22 02:26:22,825 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:22,825 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011935189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:22,825 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:22,825 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:22,826 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363301004] [2021-05-22 02:26:22,826 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:22,826 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:22,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:22,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:22,826 INFO L87 Difference]: Start difference. First operand 464 states and 1448 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:22,988 INFO L93 Difference]: Finished difference Result 585 states and 1805 transitions. [2021-05-22 02:26:22,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:22,989 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:22,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:22,989 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:26:22,989 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:26:22,990 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 154.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:22,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:26:22,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 464. [2021-05-22 02:26:22,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.127429805615551) internal successors, (1448), 463 states have internal predecessors, (1448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1448 transitions. [2021-05-22 02:26:22,994 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1448 transitions. Word has length 21 [2021-05-22 02:26:22,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:22,994 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1448 transitions. [2021-05-22 02:26:22,994 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:22,995 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1448 transitions. [2021-05-22 02:26:22,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:22,995 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:22,995 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:23,196 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 425 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2101 [2021-05-22 02:26:23,196 INFO L430 AbstractCegarLoop]: === Iteration 437 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:23,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:23,196 INFO L82 PathProgramCache]: Analyzing trace with hash 881665125, now seen corresponding path program 425 times [2021-05-22 02:26:23,196 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:23,196 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181276711] [2021-05-22 02:26:23,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:23,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:23,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:23,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:23,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181276711] [2021-05-22 02:26:23,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181276711] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:23,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1944911600] [2021-05-22 02:26:23,342 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 426 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 426 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:23,504 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:23,504 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:23,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:23,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:23,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:23,565 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,567 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:23,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,598 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:23,599 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:23,599 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:77, output treesize:63 [2021-05-22 02:26:23,658 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:23,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:23,662 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:23,667 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:23,671 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:23,675 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,725 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:23,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:23,729 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:23,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:23,733 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:23,777 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:23,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:26:23,779 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 3 variables, input treesize:141, output treesize:57 [2021-05-22 02:26:23,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:23,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1944911600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:23,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:23,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:23,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616768742] [2021-05-22 02:26:23,922 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:23,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:23,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:23,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:23,922 INFO L87 Difference]: Start difference. First operand 464 states and 1448 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:24,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:24,673 INFO L93 Difference]: Finished difference Result 673 states and 2067 transitions. [2021-05-22 02:26:24,673 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:26:24,673 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:24,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:24,675 INFO L225 Difference]: With dead ends: 673 [2021-05-22 02:26:24,675 INFO L226 Difference]: Without dead ends: 631 [2021-05-22 02:26:24,675 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 659.3ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:24,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-05-22 02:26:24,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 463. [2021-05-22 02:26:24,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1363636363636362) internal successors, (1449), 462 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:24,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1449 transitions. [2021-05-22 02:26:24,682 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1449 transitions. Word has length 21 [2021-05-22 02:26:24,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:24,682 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1449 transitions. [2021-05-22 02:26:24,682 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:24,682 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1449 transitions. [2021-05-22 02:26:24,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:24,683 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:24,683 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:24,900 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2108,426 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:24,901 INFO L430 AbstractCegarLoop]: === Iteration 438 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:24,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:24,901 INFO L82 PathProgramCache]: Analyzing trace with hash 597402441, now seen corresponding path program 426 times [2021-05-22 02:26:24,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:24,901 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460806826] [2021-05-22 02:26:24,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:24,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:25,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:25,052 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:25,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460806826] [2021-05-22 02:26:25,052 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460806826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:25,052 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828258705] [2021-05-22 02:26:25,053 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 427 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 427 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:25,083 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:25,083 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:25,084 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:25,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:25,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:25,140 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:25,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:25,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:25,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:25,158 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:25,159 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:25,159 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:26:25,200 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:25,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:25,204 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:25,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:25,207 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:25,226 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:25,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:25,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:25,230 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:25,249 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:25,251 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:25,251 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:19 [2021-05-22 02:26:25,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:25,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828258705] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:25,349 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:25,349 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:25,349 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795540642] [2021-05-22 02:26:25,349 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:25,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:25,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:25,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:25,350 INFO L87 Difference]: Start difference. First operand 463 states and 1449 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:25,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:25,836 INFO L93 Difference]: Finished difference Result 748 states and 2272 transitions. [2021-05-22 02:26:25,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:25,837 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:25,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:25,838 INFO L225 Difference]: With dead ends: 748 [2021-05-22 02:26:25,838 INFO L226 Difference]: Without dead ends: 721 [2021-05-22 02:26:25,838 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 471.9ms TimeCoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:25,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2021-05-22 02:26:25,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 466. [2021-05-22 02:26:25,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1462365591397847) internal successors, (1463), 465 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:25,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1463 transitions. [2021-05-22 02:26:25,846 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1463 transitions. Word has length 21 [2021-05-22 02:26:25,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:25,846 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1463 transitions. [2021-05-22 02:26:25,846 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:25,846 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1463 transitions. [2021-05-22 02:26:25,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:25,847 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:25,847 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:26,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 427 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2115 [2021-05-22 02:26:26,061 INFO L430 AbstractCegarLoop]: === Iteration 439 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:26,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:26,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1621875065, now seen corresponding path program 427 times [2021-05-22 02:26:26,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:26,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908311245] [2021-05-22 02:26:26,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:26,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:26,173 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:26,173 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:26,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908311245] [2021-05-22 02:26:26,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908311245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:26,173 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047905485] [2021-05-22 02:26:26,173 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 428 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 428 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:26,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:26,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:26,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:26,291 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_72]} [2021-05-22 02:26:26,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:26,296 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:26,315 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:26,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:26,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:26,319 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:26,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:26,336 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:26,336 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:26:26,408 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:26,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:26,410 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:26,419 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:26,421 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:26,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:26,422 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:26,430 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:26,431 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:26,431 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:26:26,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:26,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047905485] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:26,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:26,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:26,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511199625] [2021-05-22 02:26:26,450 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:26,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:26,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:26,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:26,450 INFO L87 Difference]: Start difference. First operand 466 states and 1463 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:26,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:26,611 INFO L93 Difference]: Finished difference Result 562 states and 1726 transitions. [2021-05-22 02:26:26,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:26,612 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:26,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:26,613 INFO L225 Difference]: With dead ends: 562 [2021-05-22 02:26:26,613 INFO L226 Difference]: Without dead ends: 541 [2021-05-22 02:26:26,613 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 204.0ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:26,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-22 02:26:26,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 462. [2021-05-22 02:26:26,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1366594360086766) internal successors, (1446), 461 states have internal predecessors, (1446), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:26,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1446 transitions. [2021-05-22 02:26:26,620 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1446 transitions. Word has length 21 [2021-05-22 02:26:26,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:26,620 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1446 transitions. [2021-05-22 02:26:26,620 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:26,620 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1446 transitions. [2021-05-22 02:26:26,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:26,623 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:26,623 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:26,841 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2126,428 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:26,841 INFO L430 AbstractCegarLoop]: === Iteration 440 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:26,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:26,842 INFO L82 PathProgramCache]: Analyzing trace with hash -2013323637, now seen corresponding path program 428 times [2021-05-22 02:26:26,842 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:26,842 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [732149272] [2021-05-22 02:26:26,842 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:26,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:26,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:26,998 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:26,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [732149272] [2021-05-22 02:26:26,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [732149272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:26,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1134356770] [2021-05-22 02:26:26,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 429 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 429 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:27,028 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:27,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:27,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:27,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:27,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:27,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,075 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,076 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:27,077 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:26:27,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:27,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:27,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:27,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:27,113 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,128 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,130 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:27,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:26:27,131 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,146 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:27,146 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:21 [2021-05-22 02:26:27,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:27,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1134356770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:27,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:27,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:27,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698005078] [2021-05-22 02:26:27,180 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:27,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:27,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:27,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:27,180 INFO L87 Difference]: Start difference. First operand 462 states and 1446 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:27,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:27,358 INFO L93 Difference]: Finished difference Result 559 states and 1726 transitions. [2021-05-22 02:26:27,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:27,358 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:27,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:27,359 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:26:27,359 INFO L226 Difference]: Without dead ends: 523 [2021-05-22 02:26:27,359 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 178.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:27,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-22 02:26:27,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 463. [2021-05-22 02:26:27,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1406926406926408) internal successors, (1451), 462 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:27,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1451 transitions. [2021-05-22 02:26:27,364 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1451 transitions. Word has length 21 [2021-05-22 02:26:27,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:27,364 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1451 transitions. [2021-05-22 02:26:27,364 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:27,364 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1451 transitions. [2021-05-22 02:26:27,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:27,364 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:27,364 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:27,564 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2131,429 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:27,565 INFO L430 AbstractCegarLoop]: === Iteration 441 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:27,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:27,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1716057227, now seen corresponding path program 429 times [2021-05-22 02:26:27,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:27,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [630355688] [2021-05-22 02:26:27,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:27,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:27,661 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:27,661 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:27,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [630355688] [2021-05-22 02:26:27,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [630355688] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:27,661 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119194685] [2021-05-22 02:26:27,661 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 430 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 430 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:27,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:26:27,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:27,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:27,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:27,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:27,762 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:27,765 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,779 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,780 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:27,780 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:27,813 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_74, v_prenex_73], 1=[o_0, o_4]} [2021-05-22 02:26:27,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:27,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,828 INFO L518 ElimStorePlain]: Eliminatee v_prenex_73 vanished before elimination [2021-05-22 02:26:27,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:27,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:27,831 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,841 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:27,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:27,844 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:27,854 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:27,854 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:27,854 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:27,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:27,925 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119194685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:27,925 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:27,925 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:27,925 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877603913] [2021-05-22 02:26:27,925 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:27,925 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:27,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:27,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:27,926 INFO L87 Difference]: Start difference. First operand 463 states and 1451 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:28,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:28,269 INFO L93 Difference]: Finished difference Result 674 states and 2069 transitions. [2021-05-22 02:26:28,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:28,269 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:28,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:28,270 INFO L225 Difference]: With dead ends: 674 [2021-05-22 02:26:28,270 INFO L226 Difference]: Without dead ends: 651 [2021-05-22 02:26:28,270 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 288.6ms TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:28,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-05-22 02:26:28,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 478. [2021-05-22 02:26:28,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.157232704402516) internal successors, (1506), 477 states have internal predecessors, (1506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:28,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1506 transitions. [2021-05-22 02:26:28,275 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1506 transitions. Word has length 21 [2021-05-22 02:26:28,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:28,275 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1506 transitions. [2021-05-22 02:26:28,275 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:28,275 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1506 transitions. [2021-05-22 02:26:28,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:28,276 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:28,276 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:28,476 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 430 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2135 [2021-05-22 02:26:28,476 INFO L430 AbstractCegarLoop]: === Iteration 442 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:28,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:28,477 INFO L82 PathProgramCache]: Analyzing trace with hash -2000319911, now seen corresponding path program 430 times [2021-05-22 02:26:28,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:28,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900915900] [2021-05-22 02:26:28,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:28,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:28,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:28,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:28,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900915900] [2021-05-22 02:26:28,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900915900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:28,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612712358] [2021-05-22 02:26:28,610 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 431 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 431 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:28,640 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:28,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:28,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:28,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:28,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:28,703 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:28,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:28,706 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:28,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:28,726 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:28,726 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:28,769 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_4], 1=[v_prenex_76, v_prenex_75]} [2021-05-22 02:26:28,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:28,773 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:28,789 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:28,789 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:28,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:28,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:28,793 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:28,808 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:28,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:28,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:28,811 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:28,825 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:28,826 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:28,827 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:28,926 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:28,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612712358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:28,926 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:28,926 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:28,926 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727874312] [2021-05-22 02:26:28,926 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:28,926 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:28,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:28,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:28,927 INFO L87 Difference]: Start difference. First operand 478 states and 1506 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:29,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:29,366 INFO L93 Difference]: Finished difference Result 679 states and 2090 transitions. [2021-05-22 02:26:29,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:29,366 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:29,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:29,367 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:26:29,367 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:26:29,367 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 406.4ms TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:29,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:26:29,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 484. [2021-05-22 02:26:29,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1552795031055902) internal successors, (1524), 483 states have internal predecessors, (1524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:29,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1524 transitions. [2021-05-22 02:26:29,375 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1524 transitions. Word has length 21 [2021-05-22 02:26:29,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:29,375 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1524 transitions. [2021-05-22 02:26:29,375 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:29,375 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1524 transitions. [2021-05-22 02:26:29,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:29,376 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:29,376 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:29,592 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 431 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2144 [2021-05-22 02:26:29,593 INFO L430 AbstractCegarLoop]: === Iteration 443 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:29,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:29,593 INFO L82 PathProgramCache]: Analyzing trace with hash 333900419, now seen corresponding path program 431 times [2021-05-22 02:26:29,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:29,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997148522] [2021-05-22 02:26:29,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:29,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:29,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:29,708 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:29,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997148522] [2021-05-22 02:26:29,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997148522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:29,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1608045193] [2021-05-22 02:26:29,708 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 432 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 432 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:29,740 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:26:29,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:29,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:29,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:29,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:29,822 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:29,825 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,843 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:29,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:29,845 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:29,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:29,909 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:29,913 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,940 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:29,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:29,945 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:29,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:29,948 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:29,974 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:29,975 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:29,975 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:77, output treesize:31 [2021-05-22 02:26:30,071 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:30,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1608045193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:30,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:30,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:30,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461086563] [2021-05-22 02:26:30,072 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:30,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:30,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:30,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:30,072 INFO L87 Difference]: Start difference. First operand 484 states and 1524 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:30,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:30,294 INFO L93 Difference]: Finished difference Result 565 states and 1744 transitions. [2021-05-22 02:26:30,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:30,294 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:30,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:30,295 INFO L225 Difference]: With dead ends: 565 [2021-05-22 02:26:30,295 INFO L226 Difference]: Without dead ends: 546 [2021-05-22 02:26:30,295 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 297.5ms TimeCoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:26:30,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-22 02:26:30,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 468. [2021-05-22 02:26:30,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.147751605995717) internal successors, (1470), 467 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:30,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1470 transitions. [2021-05-22 02:26:30,302 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1470 transitions. Word has length 21 [2021-05-22 02:26:30,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:30,302 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1470 transitions. [2021-05-22 02:26:30,302 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:30,302 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1470 transitions. [2021-05-22 02:26:30,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:30,303 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:30,303 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:30,520 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 432 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2156 [2021-05-22 02:26:30,521 INFO L430 AbstractCegarLoop]: === Iteration 444 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:30,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:30,521 INFO L82 PathProgramCache]: Analyzing trace with hash 879273073, now seen corresponding path program 432 times [2021-05-22 02:26:30,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:30,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [267926938] [2021-05-22 02:26:30,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:30,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:30,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:30,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:30,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [267926938] [2021-05-22 02:26:30,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [267926938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:30,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063701729] [2021-05-22 02:26:30,709 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 433 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 433 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:30,773 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:30,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:30,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:30,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:30,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:30,847 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:30,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:30,850 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:30,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:30,871 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:30,871 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:30,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:30,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:30,986 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:30,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:30,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:30,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:30,995 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,001 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:31,002 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,002 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:26:31,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:31,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063701729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:31,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:31,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:26:31,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1864550787] [2021-05-22 02:26:31,015 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:26:31,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:31,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:26:31,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:31,016 INFO L87 Difference]: Start difference. First operand 468 states and 1470 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:31,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:31,260 INFO L93 Difference]: Finished difference Result 574 states and 1763 transitions. [2021-05-22 02:26:31,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:31,260 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:31,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:31,261 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:26:31,262 INFO L226 Difference]: Without dead ends: 553 [2021-05-22 02:26:31,262 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 275.1ms TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:31,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-05-22 02:26:31,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 468. [2021-05-22 02:26:31,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1563169164882225) internal successors, (1474), 467 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:31,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1474 transitions. [2021-05-22 02:26:31,268 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1474 transitions. Word has length 21 [2021-05-22 02:26:31,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:31,269 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1474 transitions. [2021-05-22 02:26:31,269 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:31,269 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1474 transitions. [2021-05-22 02:26:31,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:31,269 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:31,269 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:31,488 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2163,433 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:31,489 INFO L430 AbstractCegarLoop]: === Iteration 445 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:31,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:31,489 INFO L82 PathProgramCache]: Analyzing trace with hash -839711609, now seen corresponding path program 433 times [2021-05-22 02:26:31,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:31,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992015607] [2021-05-22 02:26:31,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:31,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:31,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:31,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:31,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992015607] [2021-05-22 02:26:31,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992015607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:31,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330482307] [2021-05-22 02:26:31,609 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 434 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 434 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:31,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:31,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:31,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:31,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:31,716 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:31,719 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,738 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:31,739 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:31,739 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:31,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:31,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:31,801 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,808 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:31,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:31,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:31,811 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:31,819 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:31,819 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:26:31,838 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:31,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330482307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:31,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:31,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:31,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269579626] [2021-05-22 02:26:31,839 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:31,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:31,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:31,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:31,839 INFO L87 Difference]: Start difference. First operand 468 states and 1474 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:32,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:32,039 INFO L93 Difference]: Finished difference Result 574 states and 1763 transitions. [2021-05-22 02:26:32,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:32,040 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:32,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:32,041 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:26:32,041 INFO L226 Difference]: Without dead ends: 553 [2021-05-22 02:26:32,041 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 185.1ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:32,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-05-22 02:26:32,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 464. [2021-05-22 02:26:32,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.146868250539957) internal successors, (1457), 463 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:32,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1457 transitions. [2021-05-22 02:26:32,048 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1457 transitions. Word has length 21 [2021-05-22 02:26:32,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:32,048 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1457 transitions. [2021-05-22 02:26:32,048 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:32,048 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1457 transitions. [2021-05-22 02:26:32,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:32,049 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:32,049 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:32,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2173,434 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:32,269 INFO L430 AbstractCegarLoop]: === Iteration 446 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:32,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:32,269 INFO L82 PathProgramCache]: Analyzing trace with hash 556675569, now seen corresponding path program 434 times [2021-05-22 02:26:32,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:32,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832456398] [2021-05-22 02:26:32,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:32,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:32,407 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:32,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:32,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832456398] [2021-05-22 02:26:32,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832456398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:32,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1739307676] [2021-05-22 02:26:32,407 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 435 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 435 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:32,432 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:32,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:32,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:32,432 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:32,500 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:32,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:32,501 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:32,507 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:32,507 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:32,508 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:26:32,550 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:26:32,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:32,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:32,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:32,561 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:32,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:32,562 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:32,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:32,568 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:32,568 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:26:32,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:32,605 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1739307676] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:32,605 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:32,605 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:32,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369264090] [2021-05-22 02:26:32,605 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:32,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:32,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:32,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:32,606 INFO L87 Difference]: Start difference. First operand 464 states and 1457 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:33,034 INFO L93 Difference]: Finished difference Result 658 states and 2022 transitions. [2021-05-22 02:26:33,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:33,035 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:33,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:33,036 INFO L225 Difference]: With dead ends: 658 [2021-05-22 02:26:33,036 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:26:33,036 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 392.0ms TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:33,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:26:33,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 466. [2021-05-22 02:26:33,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1440860215053763) internal successors, (1462), 465 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1462 transitions. [2021-05-22 02:26:33,043 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1462 transitions. Word has length 21 [2021-05-22 02:26:33,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:33,043 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1462 transitions. [2021-05-22 02:26:33,043 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,043 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1462 transitions. [2021-05-22 02:26:33,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:33,044 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:33,044 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:33,265 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 435 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2177 [2021-05-22 02:26:33,265 INFO L430 AbstractCegarLoop]: === Iteration 447 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:33,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:33,265 INFO L82 PathProgramCache]: Analyzing trace with hash -773252593, now seen corresponding path program 435 times [2021-05-22 02:26:33,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:33,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816371537] [2021-05-22 02:26:33,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:33,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:33,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:33,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:33,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816371537] [2021-05-22 02:26:33,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816371537] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:33,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364263526] [2021-05-22 02:26:33,357 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 436 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 436 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:33,382 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:33,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:33,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:33,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:33,475 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:33,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:33,476 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:33,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:33,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:33,483 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:26:33,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:33,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:33,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:33,517 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:33,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:33,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:33,520 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:33,527 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:33,528 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:33,528 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:26:33,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:33,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364263526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:33,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:33,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:33,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005530335] [2021-05-22 02:26:33,543 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:33,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:33,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:33,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:33,543 INFO L87 Difference]: Start difference. First operand 466 states and 1462 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:33,668 INFO L93 Difference]: Finished difference Result 555 states and 1712 transitions. [2021-05-22 02:26:33,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:33,668 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:33,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:33,669 INFO L225 Difference]: With dead ends: 555 [2021-05-22 02:26:33,669 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:26:33,669 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 152.7ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:33,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:26:33,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 463. [2021-05-22 02:26:33,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1385281385281387) internal successors, (1450), 462 states have internal predecessors, (1450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1450 transitions. [2021-05-22 02:26:33,674 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1450 transitions. Word has length 21 [2021-05-22 02:26:33,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:33,674 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1450 transitions. [2021-05-22 02:26:33,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:33,674 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1450 transitions. [2021-05-22 02:26:33,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:33,675 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:33,675 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:33,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2179,436 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:33,875 INFO L430 AbstractCegarLoop]: === Iteration 448 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:33,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:33,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1688334081, now seen corresponding path program 436 times [2021-05-22 02:26:33,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:33,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599485319] [2021-05-22 02:26:33,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:33,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:34,000 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:34,001 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:34,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599485319] [2021-05-22 02:26:34,001 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [599485319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:34,001 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389430973] [2021-05-22 02:26:34,001 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 437 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 437 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:34,025 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:34,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:34,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:34,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:34,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:34,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,095 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:34,096 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:34,096 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:26:34,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:34,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:34,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:34,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:34,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:34,128 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:34,134 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,134 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:26:34,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:34,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389430973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:34,180 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:34,180 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:34,180 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611783020] [2021-05-22 02:26:34,180 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:34,180 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:34,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:34,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:34,180 INFO L87 Difference]: Start difference. First operand 463 states and 1450 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:34,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:34,456 INFO L93 Difference]: Finished difference Result 620 states and 1898 transitions. [2021-05-22 02:26:34,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:26:34,456 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:34,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:34,457 INFO L225 Difference]: With dead ends: 620 [2021-05-22 02:26:34,457 INFO L226 Difference]: Without dead ends: 599 [2021-05-22 02:26:34,457 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 295.4ms TimeCoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:26:34,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-22 02:26:34,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 442. [2021-05-22 02:26:34,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 441 states have (on average 3.120181405895692) internal successors, (1376), 441 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:34,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 1376 transitions. [2021-05-22 02:26:34,462 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 1376 transitions. Word has length 21 [2021-05-22 02:26:34,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:34,462 INFO L482 AbstractCegarLoop]: Abstraction has 442 states and 1376 transitions. [2021-05-22 02:26:34,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:34,462 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 1376 transitions. [2021-05-22 02:26:34,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:34,463 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:34,463 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:34,663 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2182,437 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:34,663 INFO L430 AbstractCegarLoop]: === Iteration 449 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:34,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:34,663 INFO L82 PathProgramCache]: Analyzing trace with hash 2051605755, now seen corresponding path program 437 times [2021-05-22 02:26:34,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:34,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927184901] [2021-05-22 02:26:34,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:34,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:34,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:34,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:34,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927184901] [2021-05-22 02:26:34,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927184901] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:34,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [103282594] [2021-05-22 02:26:34,758 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 438 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 438 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:34,789 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:34,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:34,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:34,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:34,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:34,824 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:34,827 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:34,836 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:34,836 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:34,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:34,887 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,890 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:34,890 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:34,890 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:34,890 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:26:34,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:34,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [103282594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:34,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:34,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:34,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502619465] [2021-05-22 02:26:34,899 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:34,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:34,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:34,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:34,899 INFO L87 Difference]: Start difference. First operand 442 states and 1376 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:35,085 INFO L93 Difference]: Finished difference Result 578 states and 1779 transitions. [2021-05-22 02:26:35,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:35,085 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:35,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:35,086 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:26:35,086 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:26:35,086 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 162.9ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:35,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:26:35,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 460. [2021-05-22 02:26:35,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.130718954248366) internal successors, (1437), 459 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1437 transitions. [2021-05-22 02:26:35,091 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1437 transitions. Word has length 21 [2021-05-22 02:26:35,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:35,091 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1437 transitions. [2021-05-22 02:26:35,091 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,091 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1437 transitions. [2021-05-22 02:26:35,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:35,091 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:35,091 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:35,292 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2184,438 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:35,292 INFO L430 AbstractCegarLoop]: === Iteration 450 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:35,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:35,292 INFO L82 PathProgramCache]: Analyzing trace with hash 1549814419, now seen corresponding path program 438 times [2021-05-22 02:26:35,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:35,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [170784890] [2021-05-22 02:26:35,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:35,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:35,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:35,369 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:35,369 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [170784890] [2021-05-22 02:26:35,369 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [170784890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:35,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472679696] [2021-05-22 02:26:35,370 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 439 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 439 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:35,394 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:35,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:35,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:35,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:35,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:35,429 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:35,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:35,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:35,440 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:35,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:35,440 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:35,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:35,477 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:35,481 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:35,481 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:35,481 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:35,481 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:26:35,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:35,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472679696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:35,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:35,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:35,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799971325] [2021-05-22 02:26:35,494 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:35,494 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:35,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:35,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:35,495 INFO L87 Difference]: Start difference. First operand 460 states and 1437 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:35,668 INFO L93 Difference]: Finished difference Result 587 states and 1803 transitions. [2021-05-22 02:26:35,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:35,668 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:35,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:35,669 INFO L225 Difference]: With dead ends: 587 [2021-05-22 02:26:35,669 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:26:35,669 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 140.3ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:35,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:26:35,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 457. [2021-05-22 02:26:35,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.125) internal successors, (1425), 456 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1425 transitions. [2021-05-22 02:26:35,674 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1425 transitions. Word has length 21 [2021-05-22 02:26:35,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:35,674 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1425 transitions. [2021-05-22 02:26:35,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:35,674 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1425 transitions. [2021-05-22 02:26:35,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:35,675 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:35,675 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:35,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2187,439 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:35,875 INFO L430 AbstractCegarLoop]: === Iteration 451 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:35,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:35,876 INFO L82 PathProgramCache]: Analyzing trace with hash -1618037423, now seen corresponding path program 439 times [2021-05-22 02:26:35,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:35,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [698736798] [2021-05-22 02:26:35,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:35,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:35,967 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:35,967 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:35,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [698736798] [2021-05-22 02:26:35,967 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [698736798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:35,967 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961408392] [2021-05-22 02:26:35,967 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 440 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 440 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:35,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:35,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:35,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:36,073 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_77], 1=[o_0]} [2021-05-22 02:26:36,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:36,077 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:36,090 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:36,092 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:36,092 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:36,093 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:36,105 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:36,106 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:36,106 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:26:36,209 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:36,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:36,211 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:36,217 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:36,219 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:36,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:36,220 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:36,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:36,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:36,226 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:7 [2021-05-22 02:26:36,254 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:36,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961408392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:36,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:36,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:36,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620718497] [2021-05-22 02:26:36,254 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:36,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:36,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:36,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:36,255 INFO L87 Difference]: Start difference. First operand 457 states and 1425 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:36,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:36,788 INFO L93 Difference]: Finished difference Result 722 states and 2222 transitions. [2021-05-22 02:26:36,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:36,789 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:36,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:36,790 INFO L225 Difference]: With dead ends: 722 [2021-05-22 02:26:36,790 INFO L226 Difference]: Without dead ends: 703 [2021-05-22 02:26:36,790 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 482.5ms TimeCoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:36,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-22 02:26:36,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 469. [2021-05-22 02:26:36,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1452991452991452) internal successors, (1472), 468 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:36,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1472 transitions. [2021-05-22 02:26:36,795 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1472 transitions. Word has length 21 [2021-05-22 02:26:36,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:36,795 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1472 transitions. [2021-05-22 02:26:36,795 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:36,795 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1472 transitions. [2021-05-22 02:26:36,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:36,796 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:36,796 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:36,996 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2190,440 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:36,996 INFO L430 AbstractCegarLoop]: === Iteration 452 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:36,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:36,997 INFO L82 PathProgramCache]: Analyzing trace with hash -1840246035, now seen corresponding path program 440 times [2021-05-22 02:26:36,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:36,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306900246] [2021-05-22 02:26:36,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:36,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:37,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:37,061 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:37,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306900246] [2021-05-22 02:26:37,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306900246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:37,061 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16875787] [2021-05-22 02:26:37,061 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 441 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 441 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:37,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:37,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:37,086 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:37,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:37,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:37,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:37,125 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,126 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:26:37,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:37,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:37,179 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,181 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:37,181 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:37,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:37,182 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:26:37,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:37,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16875787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:37,189 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:37,189 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:37,189 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459438068] [2021-05-22 02:26:37,189 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:37,190 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:37,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:37,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:37,190 INFO L87 Difference]: Start difference. First operand 469 states and 1472 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:37,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:37,356 INFO L93 Difference]: Finished difference Result 601 states and 1857 transitions. [2021-05-22 02:26:37,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:37,357 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:37,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:37,358 INFO L225 Difference]: With dead ends: 601 [2021-05-22 02:26:37,358 INFO L226 Difference]: Without dead ends: 568 [2021-05-22 02:26:37,358 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 113.0ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:37,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 568 states. [2021-05-22 02:26:37,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 568 to 469. [2021-05-22 02:26:37,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1346153846153846) internal successors, (1467), 468 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:37,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1467 transitions. [2021-05-22 02:26:37,363 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1467 transitions. Word has length 21 [2021-05-22 02:26:37,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:37,363 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1467 transitions. [2021-05-22 02:26:37,363 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:37,363 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1467 transitions. [2021-05-22 02:26:37,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:37,363 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:37,363 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:37,564 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2198,441 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:37,564 INFO L430 AbstractCegarLoop]: === Iteration 453 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:37,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:37,564 INFO L82 PathProgramCache]: Analyzing trace with hash 68354417, now seen corresponding path program 441 times [2021-05-22 02:26:37,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:37,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804972783] [2021-05-22 02:26:37,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:37,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:37,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:37,663 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:37,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804972783] [2021-05-22 02:26:37,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804972783] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:37,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947984094] [2021-05-22 02:26:37,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 442 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 442 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:37,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:37,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:37,688 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:37,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:37,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:37,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:37,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:37,736 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:37,739 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,750 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:37,751 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:37,751 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:26:37,814 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:26:37,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:37,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:37,820 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:37,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:37,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:37,834 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:37,845 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:37,846 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:37,846 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:26:37,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:37,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947984094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:37,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:37,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:37,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1199548705] [2021-05-22 02:26:37,893 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:37,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:37,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:37,893 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:37,893 INFO L87 Difference]: Start difference. First operand 469 states and 1467 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:38,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:38,282 INFO L93 Difference]: Finished difference Result 825 states and 2516 transitions. [2021-05-22 02:26:38,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:26:38,282 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:38,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:38,284 INFO L225 Difference]: With dead ends: 825 [2021-05-22 02:26:38,284 INFO L226 Difference]: Without dead ends: 802 [2021-05-22 02:26:38,284 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 341.5ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:38,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 802 states. [2021-05-22 02:26:38,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 802 to 475. [2021-05-22 02:26:38,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.130801687763713) internal successors, (1484), 474 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:38,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1484 transitions. [2021-05-22 02:26:38,290 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1484 transitions. Word has length 21 [2021-05-22 02:26:38,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:38,290 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1484 transitions. [2021-05-22 02:26:38,290 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:38,290 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1484 transitions. [2021-05-22 02:26:38,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:38,290 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:38,291 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:38,491 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2201,442 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:38,491 INFO L430 AbstractCegarLoop]: === Iteration 454 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:38,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:38,491 INFO L82 PathProgramCache]: Analyzing trace with hash -215908267, now seen corresponding path program 442 times [2021-05-22 02:26:38,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:38,491 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249946001] [2021-05-22 02:26:38,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:38,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:38,575 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:38,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:38,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249946001] [2021-05-22 02:26:38,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249946001] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:38,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416726199] [2021-05-22 02:26:38,576 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 443 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 443 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:38,601 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:38,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:38,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:38,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:38,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:38,632 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:38,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:38,637 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:38,637 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:26:38,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:38,673 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:38,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:38,676 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:38,682 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:38,682 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:38,682 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:38,682 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:26:38,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:38,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416726199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:38,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:38,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:26:38,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536587170] [2021-05-22 02:26:38,731 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:26:38,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:38,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:26:38,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:38,732 INFO L87 Difference]: Start difference. First operand 475 states and 1484 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:39,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:39,136 INFO L93 Difference]: Finished difference Result 698 states and 2154 transitions. [2021-05-22 02:26:39,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:39,136 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:39,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:39,137 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:26:39,137 INFO L226 Difference]: Without dead ends: 671 [2021-05-22 02:26:39,137 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 299.3ms TimeCoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:39,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-05-22 02:26:39,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 473. [2021-05-22 02:26:39,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1334745762711864) internal successors, (1479), 472 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:39,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1479 transitions. [2021-05-22 02:26:39,143 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1479 transitions. Word has length 21 [2021-05-22 02:26:39,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:39,143 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1479 transitions. [2021-05-22 02:26:39,143 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:39,143 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1479 transitions. [2021-05-22 02:26:39,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:39,143 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:39,143 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:39,343 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2209,443 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:39,344 INFO L430 AbstractCegarLoop]: === Iteration 455 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:39,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:39,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1929773965, now seen corresponding path program 443 times [2021-05-22 02:26:39,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:39,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135643341] [2021-05-22 02:26:39,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:39,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:39,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:39,450 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:39,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135643341] [2021-05-22 02:26:39,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135643341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:39,450 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2142334262] [2021-05-22 02:26:39,450 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 444 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 444 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:39,479 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:39,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:39,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:39,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:39,577 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_78], 1=[o_0]} [2021-05-22 02:26:39,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:39,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:39,586 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:39,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:39,641 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,644 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:39,645 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,689 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:39,691 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 2 dim-0 vars, and 4 xjuncts. [2021-05-22 02:26:39,692 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:119, output treesize:87 [2021-05-22 02:26:39,846 INFO L446 ElimStorePlain]: Different costs {1=[o_4], 3=[o_2]} [2021-05-22 02:26:39,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:39,850 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,852 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:39,854 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:39,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:39,881 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:39,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:39,884 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:39,906 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:39,907 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:39,908 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 5 variables, input treesize:83, output treesize:31 [2021-05-22 02:26:39,981 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:39,982 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2142334262] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:39,982 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:39,982 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:39,982 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387231337] [2021-05-22 02:26:39,982 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:39,982 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:39,982 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:39,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:39,982 INFO L87 Difference]: Start difference. First operand 473 states and 1479 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:40,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:40,617 INFO L93 Difference]: Finished difference Result 743 states and 2292 transitions. [2021-05-22 02:26:40,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:26:40,618 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:40,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:40,619 INFO L225 Difference]: With dead ends: 743 [2021-05-22 02:26:40,619 INFO L226 Difference]: Without dead ends: 724 [2021-05-22 02:26:40,619 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 656.8ms TimeCoverageRelationStatistics Valid=119, Invalid=531, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:26:40,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-05-22 02:26:40,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 469. [2021-05-22 02:26:40,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.126068376068376) internal successors, (1463), 468 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:40,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1463 transitions. [2021-05-22 02:26:40,624 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1463 transitions. Word has length 21 [2021-05-22 02:26:40,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:40,625 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1463 transitions. [2021-05-22 02:26:40,625 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:40,625 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1463 transitions. [2021-05-22 02:26:40,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:40,625 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:40,625 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:40,825 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 444 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2215 [2021-05-22 02:26:40,826 INFO L430 AbstractCegarLoop]: === Iteration 456 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:40,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:40,826 INFO L82 PathProgramCache]: Analyzing trace with hash 636231443, now seen corresponding path program 444 times [2021-05-22 02:26:40,826 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:40,826 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568259394] [2021-05-22 02:26:40,826 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:40,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:40,908 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:40,908 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:40,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568259394] [2021-05-22 02:26:40,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568259394] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:40,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [928498617] [2021-05-22 02:26:40,909 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 445 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 445 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:40,934 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:40,934 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:40,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:40,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:40,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:40,969 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:40,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:40,971 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:40,980 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:40,981 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:40,981 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:41,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:41,032 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:41,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:41,042 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:41,048 INFO L518 ElimStorePlain]: Eliminatee v_prenex_80 vanished before elimination [2021-05-22 02:26:41,048 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:41,048 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:41,048 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:26:41,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:41,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [928498617] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:41,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:41,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:41,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [380308387] [2021-05-22 02:26:41,074 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:41,074 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:41,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:41,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:41,075 INFO L87 Difference]: Start difference. First operand 469 states and 1463 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:41,247 INFO L93 Difference]: Finished difference Result 635 states and 1959 transitions. [2021-05-22 02:26:41,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:41,247 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:41,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:41,248 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:26:41,248 INFO L226 Difference]: Without dead ends: 606 [2021-05-22 02:26:41,248 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 151.9ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:41,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2021-05-22 02:26:41,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 469. [2021-05-22 02:26:41,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.126068376068376) internal successors, (1463), 468 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1463 transitions. [2021-05-22 02:26:41,253 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1463 transitions. Word has length 21 [2021-05-22 02:26:41,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:41,253 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1463 transitions. [2021-05-22 02:26:41,253 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,253 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1463 transitions. [2021-05-22 02:26:41,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:41,254 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:41,254 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:41,454 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 445 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2225 [2021-05-22 02:26:41,454 INFO L430 AbstractCegarLoop]: === Iteration 457 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:41,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:41,454 INFO L82 PathProgramCache]: Analyzing trace with hash -458467475, now seen corresponding path program 445 times [2021-05-22 02:26:41,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:41,454 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94249253] [2021-05-22 02:26:41,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:41,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:41,521 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:41,521 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:41,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94249253] [2021-05-22 02:26:41,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94249253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:41,521 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [187116345] [2021-05-22 02:26:41,521 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 446 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 446 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:41,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:41,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:41,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:41,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:41,580 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,585 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:41,585 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,585 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:26:41,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:41,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:41,625 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:41,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:41,631 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:41,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:41,631 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:26:41,649 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:41,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [187116345] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:41,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:41,649 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:41,649 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53477646] [2021-05-22 02:26:41,649 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:41,649 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:41,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:41,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:41,650 INFO L87 Difference]: Start difference. First operand 469 states and 1463 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:41,818 INFO L93 Difference]: Finished difference Result 598 states and 1842 transitions. [2021-05-22 02:26:41,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:41,818 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:41,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:41,819 INFO L225 Difference]: With dead ends: 598 [2021-05-22 02:26:41,819 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:26:41,819 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 121.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:41,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:26:41,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 466. [2021-05-22 02:26:41,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.129032258064516) internal successors, (1455), 465 states have internal predecessors, (1455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1455 transitions. [2021-05-22 02:26:41,825 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1455 transitions. Word has length 21 [2021-05-22 02:26:41,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:41,825 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1455 transitions. [2021-05-22 02:26:41,825 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:41,825 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1455 transitions. [2021-05-22 02:26:41,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:41,825 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:41,825 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:42,025 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 446 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2233 [2021-05-22 02:26:42,026 INFO L430 AbstractCegarLoop]: === Iteration 458 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:42,026 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:42,026 INFO L82 PathProgramCache]: Analyzing trace with hash -1082753239, now seen corresponding path program 446 times [2021-05-22 02:26:42,026 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:42,026 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930677903] [2021-05-22 02:26:42,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:42,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:42,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:42,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:42,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930677903] [2021-05-22 02:26:42,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930677903] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:42,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751727305] [2021-05-22 02:26:42,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 447 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 447 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:42,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:42,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:42,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:42,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:42,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:42,162 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:42,165 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,174 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,174 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:42,174 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:42,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:42,201 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,211 INFO L518 ElimStorePlain]: Eliminatee v_prenex_82 vanished before elimination [2021-05-22 02:26:42,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:42,213 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,222 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:42,222 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:42,222 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:26:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:42,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751727305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:42,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:42,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:42,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271048085] [2021-05-22 02:26:42,262 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:42,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:42,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:42,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:42,262 INFO L87 Difference]: Start difference. First operand 466 states and 1455 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:42,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:42,464 INFO L93 Difference]: Finished difference Result 638 states and 1967 transitions. [2021-05-22 02:26:42,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:42,465 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:42,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:42,465 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:26:42,465 INFO L226 Difference]: Without dead ends: 609 [2021-05-22 02:26:42,466 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 136.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:42,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 609 states. [2021-05-22 02:26:42,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 609 to 466. [2021-05-22 02:26:42,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.129032258064516) internal successors, (1455), 465 states have internal predecessors, (1455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:42,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1455 transitions. [2021-05-22 02:26:42,470 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1455 transitions. Word has length 21 [2021-05-22 02:26:42,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:42,470 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1455 transitions. [2021-05-22 02:26:42,470 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:42,470 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1455 transitions. [2021-05-22 02:26:42,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:42,471 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:42,471 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:42,671 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 447 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2237 [2021-05-22 02:26:42,671 INFO L430 AbstractCegarLoop]: === Iteration 459 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:42,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:42,672 INFO L82 PathProgramCache]: Analyzing trace with hash -785486829, now seen corresponding path program 447 times [2021-05-22 02:26:42,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:42,672 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1985806992] [2021-05-22 02:26:42,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:42,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:42,758 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:42,758 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:42,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1985806992] [2021-05-22 02:26:42,758 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1985806992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:42,758 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [673162460] [2021-05-22 02:26:42,758 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 448 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 448 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:42,782 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:42,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:42,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:42,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:42,872 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_84], 1=[o_0]} [2021-05-22 02:26:42,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:42,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,888 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,890 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:42,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:42,891 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,903 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,904 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:42,904 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:26:42,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:42,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:42,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:42,950 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,968 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:42,968 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:42,969 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:42,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:42,985 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:42,985 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:62, output treesize:19 [2021-05-22 02:26:43,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:43,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [673162460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:43,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:43,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:43,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057054614] [2021-05-22 02:26:43,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:43,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:43,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:43,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:43,029 INFO L87 Difference]: Start difference. First operand 466 states and 1455 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:43,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:43,291 INFO L93 Difference]: Finished difference Result 710 states and 2170 transitions. [2021-05-22 02:26:43,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:43,291 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:43,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:43,292 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:26:43,293 INFO L226 Difference]: Without dead ends: 687 [2021-05-22 02:26:43,293 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 230.4ms TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:43,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-05-22 02:26:43,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 470. [2021-05-22 02:26:43,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1471215351812365) internal successors, (1476), 469 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:43,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1476 transitions. [2021-05-22 02:26:43,298 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1476 transitions. Word has length 21 [2021-05-22 02:26:43,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:43,298 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1476 transitions. [2021-05-22 02:26:43,298 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:43,298 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1476 transitions. [2021-05-22 02:26:43,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:43,299 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:43,299 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:43,512 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2242,448 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:43,513 INFO L430 AbstractCegarLoop]: === Iteration 460 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:43,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:43,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1069749513, now seen corresponding path program 448 times [2021-05-22 02:26:43,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:43,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [369006632] [2021-05-22 02:26:43,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:43,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:43,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:43,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:43,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [369006632] [2021-05-22 02:26:43,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [369006632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:43,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790769029] [2021-05-22 02:26:43,601 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 449 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 449 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:43,626 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:43,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:43,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:43,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:43,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:43,656 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:43,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:43,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:43,661 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:26:43,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:26:43,683 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:43,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:43,685 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:43,693 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:43,694 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:43,694 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:43,694 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:26:43,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:43,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790769029] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:43,775 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:43,775 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:26:43,775 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781901916] [2021-05-22 02:26:43,775 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:26:43,775 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:43,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:26:43,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:43,775 INFO L87 Difference]: Start difference. First operand 470 states and 1476 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:44,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:44,240 INFO L93 Difference]: Finished difference Result 717 states and 2203 transitions. [2021-05-22 02:26:44,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:26:44,240 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:44,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:44,241 INFO L225 Difference]: With dead ends: 717 [2021-05-22 02:26:44,241 INFO L226 Difference]: Without dead ends: 690 [2021-05-22 02:26:44,242 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 379.4ms TimeCoverageRelationStatistics Valid=132, Invalid=518, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:26:44,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-05-22 02:26:44,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 468. [2021-05-22 02:26:44,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.137044967880086) internal successors, (1465), 467 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:44,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1465 transitions. [2021-05-22 02:26:44,247 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1465 transitions. Word has length 21 [2021-05-22 02:26:44,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:44,247 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1465 transitions. [2021-05-22 02:26:44,247 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:44,247 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1465 transitions. [2021-05-22 02:26:44,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:44,247 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:44,247 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:44,448 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2252,449 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:44,448 INFO L430 AbstractCegarLoop]: === Iteration 461 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:44,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:44,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1801107459, now seen corresponding path program 449 times [2021-05-22 02:26:44,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:44,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903133324] [2021-05-22 02:26:44,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:44,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:44,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:44,525 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:44,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903133324] [2021-05-22 02:26:44,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903133324] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:44,525 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [779442185] [2021-05-22 02:26:44,525 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 450 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 450 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:44,550 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:44,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:44,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:44,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:44,645 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,645 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:44,646 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:44,649 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,670 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:44,672 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:44,672 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:69, output treesize:55 [2021-05-22 02:26:44,865 INFO L446 ElimStorePlain]: Different costs {1=[o_4], 3=[o_2]} [2021-05-22 02:26:44,868 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,868 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:44,869 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:26:44,872 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,889 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:44,892 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,892 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:26:44,893 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,895 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:44,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:44,896 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:44,912 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:44,913 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:44,913 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 5 variables, input treesize:77, output treesize:21 [2021-05-22 02:26:44,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:44,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [779442185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:44,959 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:44,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:44,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480956857] [2021-05-22 02:26:44,960 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:44,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:44,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:44,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:44,960 INFO L87 Difference]: Start difference. First operand 468 states and 1465 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:45,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:45,271 INFO L93 Difference]: Finished difference Result 634 states and 1954 transitions. [2021-05-22 02:26:45,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:26:45,272 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:45,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:45,272 INFO L225 Difference]: With dead ends: 634 [2021-05-22 02:26:45,272 INFO L226 Difference]: Without dead ends: 615 [2021-05-22 02:26:45,273 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 9 SyntacticMatches, 6 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 428.2ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:26:45,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-05-22 02:26:45,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 476. [2021-05-22 02:26:45,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.143157894736842) internal successors, (1493), 475 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:45,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1493 transitions. [2021-05-22 02:26:45,278 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1493 transitions. Word has length 21 [2021-05-22 02:26:45,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:45,278 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1493 transitions. [2021-05-22 02:26:45,278 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:45,278 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1493 transitions. [2021-05-22 02:26:45,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:45,278 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:45,278 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:45,479 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2261,450 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:45,479 INFO L430 AbstractCegarLoop]: === Iteration 462 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:45,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:45,479 INFO L82 PathProgramCache]: Analyzing trace with hash -232529021, now seen corresponding path program 450 times [2021-05-22 02:26:45,479 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:45,479 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661307684] [2021-05-22 02:26:45,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:45,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:45,571 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:45,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:45,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661307684] [2021-05-22 02:26:45,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [661307684] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:45,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468210226] [2021-05-22 02:26:45,571 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 451 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 451 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:45,595 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:26:45,596 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:45,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:45,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:45,690 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:45,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:45,691 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:45,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:45,698 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:26:45,698 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:22 [2021-05-22 02:26:45,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:45,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:45,734 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:45,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:45,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:45,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:45,743 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:45,750 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:45,750 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:45,751 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:26:45,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:45,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468210226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:45,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:45,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:45,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531692716] [2021-05-22 02:26:45,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:45,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:45,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:45,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:45,795 INFO L87 Difference]: Start difference. First operand 476 states and 1493 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:46,238 INFO L93 Difference]: Finished difference Result 739 states and 2280 transitions. [2021-05-22 02:26:46,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:46,238 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:46,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:46,239 INFO L225 Difference]: With dead ends: 739 [2021-05-22 02:26:46,239 INFO L226 Difference]: Without dead ends: 720 [2021-05-22 02:26:46,239 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 398.9ms TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:46,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-05-22 02:26:46,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 472. [2021-05-22 02:26:46,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1358811040339702) internal successors, (1477), 471 states have internal predecessors, (1477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1477 transitions. [2021-05-22 02:26:46,245 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1477 transitions. Word has length 21 [2021-05-22 02:26:46,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:46,245 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1477 transitions. [2021-05-22 02:26:46,245 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,245 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1477 transitions. [2021-05-22 02:26:46,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:46,246 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:46,246 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:46,446 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2275,451 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:46,446 INFO L430 AbstractCegarLoop]: === Iteration 463 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:46,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:46,446 INFO L82 PathProgramCache]: Analyzing trace with hash 385733147, now seen corresponding path program 451 times [2021-05-22 02:26:46,446 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:46,446 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645127176] [2021-05-22 02:26:46,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:46,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:46,529 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:46,529 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:46,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1645127176] [2021-05-22 02:26:46,529 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1645127176] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:46,529 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848928311] [2021-05-22 02:26:46,529 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 452 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 452 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:46,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:46,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:46,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:46,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:46,607 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:46,611 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:46,611 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:46,611 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:26:46,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:46,627 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:46,630 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:46,630 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:46,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:46,631 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:26:46,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:46,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848928311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:46,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:46,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:46,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197228269] [2021-05-22 02:26:46,643 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:46,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:46,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:46,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:46,643 INFO L87 Difference]: Start difference. First operand 472 states and 1477 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:46,758 INFO L93 Difference]: Finished difference Result 602 states and 1862 transitions. [2021-05-22 02:26:46,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:46,759 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:46,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:46,760 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:26:46,760 INFO L226 Difference]: Without dead ends: 583 [2021-05-22 02:26:46,760 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 117.8ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:46,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-05-22 02:26:46,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 468. [2021-05-22 02:26:46,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.137044967880086) internal successors, (1465), 467 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1465 transitions. [2021-05-22 02:26:46,767 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1465 transitions. Word has length 21 [2021-05-22 02:26:46,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:46,767 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1465 transitions. [2021-05-22 02:26:46,767 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:46,767 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1465 transitions. [2021-05-22 02:26:46,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:46,767 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:46,768 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:46,983 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 452 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2278 [2021-05-22 02:26:46,984 INFO L430 AbstractCegarLoop]: === Iteration 464 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:46,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:46,984 INFO L82 PathProgramCache]: Analyzing trace with hash -1672477829, now seen corresponding path program 452 times [2021-05-22 02:26:46,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:46,984 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600745091] [2021-05-22 02:26:46,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:46,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:47,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:47,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:47,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600745091] [2021-05-22 02:26:47,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1600745091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:47,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1627551002] [2021-05-22 02:26:47,057 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 453 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 453 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:47,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:47,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:47,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:47,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:47,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:47,126 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,130 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:47,130 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,130 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:26:47,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:47,150 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:47,152 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,158 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:47,158 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:47,159 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:47,159 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:26:47,175 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:47,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1627551002] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:47,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:47,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:47,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309707199] [2021-05-22 02:26:47,177 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:47,177 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:47,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:47,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:47,178 INFO L87 Difference]: Start difference. First operand 468 states and 1465 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:47,304 INFO L93 Difference]: Finished difference Result 607 states and 1875 transitions. [2021-05-22 02:26:47,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:47,304 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:47,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:47,305 INFO L225 Difference]: With dead ends: 607 [2021-05-22 02:26:47,305 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:26:47,305 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 104.6ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:47,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:26:47,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 468. [2021-05-22 02:26:47,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.137044967880086) internal successors, (1465), 467 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1465 transitions. [2021-05-22 02:26:47,310 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1465 transitions. Word has length 21 [2021-05-22 02:26:47,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:47,310 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1465 transitions. [2021-05-22 02:26:47,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,310 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1465 transitions. [2021-05-22 02:26:47,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:47,311 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:47,311 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:47,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2280,453 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:47,511 INFO L430 AbstractCegarLoop]: === Iteration 465 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:47,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:47,512 INFO L82 PathProgramCache]: Analyzing trace with hash 1527790549, now seen corresponding path program 453 times [2021-05-22 02:26:47,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:47,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678117993] [2021-05-22 02:26:47,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:47,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:47,583 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:47,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:47,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678117993] [2021-05-22 02:26:47,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678117993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:47,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698264035] [2021-05-22 02:26:47,583 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 454 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 454 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:47,608 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:47,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:47,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:47,609 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:47,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:47,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:47,659 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,665 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:47,666 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:47,666 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:26:47,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:47,689 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,696 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:47,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:47,698 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:47,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:47,704 INFO L518 ElimStorePlain]: Eliminatee v_prenex_91 vanished before elimination [2021-05-22 02:26:47,704 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:47,704 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:47,704 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:26:47,732 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:47,732 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698264035] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:47,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:47,733 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:47,733 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358141224] [2021-05-22 02:26:47,733 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:47,733 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:47,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:47,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:47,733 INFO L87 Difference]: Start difference. First operand 468 states and 1465 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:47,921 INFO L93 Difference]: Finished difference Result 648 states and 1994 transitions. [2021-05-22 02:26:47,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:47,921 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:47,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:47,922 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:26:47,922 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:26:47,922 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 140.7ms TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:47,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:26:47,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 483. [2021-05-22 02:26:47,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1348547717842323) internal successors, (1511), 482 states have internal predecessors, (1511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1511 transitions. [2021-05-22 02:26:47,927 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1511 transitions. Word has length 21 [2021-05-22 02:26:47,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:47,927 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1511 transitions. [2021-05-22 02:26:47,927 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:47,927 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1511 transitions. [2021-05-22 02:26:47,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:47,928 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:47,928 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:48,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2283,454 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:48,128 INFO L430 AbstractCegarLoop]: === Iteration 466 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:48,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:48,128 INFO L82 PathProgramCache]: Analyzing trace with hash -886423809, now seen corresponding path program 454 times [2021-05-22 02:26:48,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:48,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102416227] [2021-05-22 02:26:48,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:48,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:48,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:48,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:48,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102416227] [2021-05-22 02:26:48,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2102416227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:48,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282647718] [2021-05-22 02:26:48,203 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 455 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 455 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:48,227 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:48,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:48,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:48,228 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:48,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:48,278 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:48,280 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,286 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:48,286 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:48,286 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:26:48,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:48,316 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:48,319 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:48,319 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,319 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:26:48,328 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:48,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282647718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:48,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:48,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:48,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668949170] [2021-05-22 02:26:48,329 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:48,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:48,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:48,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:48,329 INFO L87 Difference]: Start difference. First operand 483 states and 1511 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:48,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:48,549 INFO L93 Difference]: Finished difference Result 598 states and 1841 transitions. [2021-05-22 02:26:48,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:48,549 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:48,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:48,550 INFO L225 Difference]: With dead ends: 598 [2021-05-22 02:26:48,550 INFO L226 Difference]: Without dead ends: 577 [2021-05-22 02:26:48,550 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 116.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:48,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-05-22 02:26:48,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 465. [2021-05-22 02:26:48,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1400862068965516) internal successors, (1457), 464 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:48,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1457 transitions. [2021-05-22 02:26:48,555 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1457 transitions. Word has length 21 [2021-05-22 02:26:48,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:48,555 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1457 transitions. [2021-05-22 02:26:48,555 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:48,555 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1457 transitions. [2021-05-22 02:26:48,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:48,556 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:48,556 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:48,756 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 455 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2291 [2021-05-22 02:26:48,756 INFO L430 AbstractCegarLoop]: === Iteration 467 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:48,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:48,756 INFO L82 PathProgramCache]: Analyzing trace with hash -234130767, now seen corresponding path program 455 times [2021-05-22 02:26:48,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:48,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484381840] [2021-05-22 02:26:48,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:48,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:48,834 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:48,834 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:48,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484381840] [2021-05-22 02:26:48,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484381840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:48,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14186975] [2021-05-22 02:26:48,834 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 456 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 456 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:48,859 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:48,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:48,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:48,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:48,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:48,890 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:48,895 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,895 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:26:48,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:48,917 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:48,919 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:48,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:48,928 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:48,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:48,928 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:26:48,962 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:48,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14186975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:48,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:48,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:48,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52918125] [2021-05-22 02:26:48,963 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:48,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:48,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:48,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:48,963 INFO L87 Difference]: Start difference. First operand 465 states and 1457 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:49,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:49,104 INFO L93 Difference]: Finished difference Result 622 states and 1915 transitions. [2021-05-22 02:26:49,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:49,104 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:49,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:49,105 INFO L225 Difference]: With dead ends: 622 [2021-05-22 02:26:49,105 INFO L226 Difference]: Without dead ends: 586 [2021-05-22 02:26:49,105 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 113.4ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:49,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2021-05-22 02:26:49,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 466. [2021-05-22 02:26:49,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1440860215053763) internal successors, (1462), 465 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:49,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1462 transitions. [2021-05-22 02:26:49,110 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1462 transitions. Word has length 21 [2021-05-22 02:26:49,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:49,110 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1462 transitions. [2021-05-22 02:26:49,110 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:49,110 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1462 transitions. [2021-05-22 02:26:49,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:49,110 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:49,110 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:49,310 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2294,456 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:49,311 INFO L430 AbstractCegarLoop]: === Iteration 468 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:49,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:49,311 INFO L82 PathProgramCache]: Analyzing trace with hash 63135643, now seen corresponding path program 456 times [2021-05-22 02:26:49,311 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:49,311 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311826563] [2021-05-22 02:26:49,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:49,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:49,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:49,419 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:49,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311826563] [2021-05-22 02:26:49,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311826563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:49,419 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110050797] [2021-05-22 02:26:49,419 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 457 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 457 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:49,448 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:49,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:49,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:49,449 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:49,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:49,499 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:49,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:49,501 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:49,516 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:49,517 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:49,517 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:49,551 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_94, v_prenex_93], 1=[o_0, o_4]} [2021-05-22 02:26:49,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:49,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:49,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:49,566 INFO L518 ElimStorePlain]: Eliminatee v_prenex_93 vanished before elimination [2021-05-22 02:26:49,568 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:49,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:49,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:49,580 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:49,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:49,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:49,582 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:49,592 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:49,593 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:49,593 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:49,670 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:49,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110050797] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:49,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:49,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:49,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741219353] [2021-05-22 02:26:49,671 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:49,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:49,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:49,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:49,671 INFO L87 Difference]: Start difference. First operand 466 states and 1462 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:50,082 INFO L93 Difference]: Finished difference Result 798 states and 2447 transitions. [2021-05-22 02:26:50,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:50,082 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:50,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:50,084 INFO L225 Difference]: With dead ends: 798 [2021-05-22 02:26:50,084 INFO L226 Difference]: Without dead ends: 775 [2021-05-22 02:26:50,084 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 368.3ms TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:26:50,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 775 states. [2021-05-22 02:26:50,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 775 to 472. [2021-05-22 02:26:50,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1528662420382165) internal successors, (1485), 471 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1485 transitions. [2021-05-22 02:26:50,090 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1485 transitions. Word has length 21 [2021-05-22 02:26:50,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:50,090 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1485 transitions. [2021-05-22 02:26:50,090 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,090 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1485 transitions. [2021-05-22 02:26:50,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:50,090 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:50,090 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:50,291 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2297,457 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:50,291 INFO L430 AbstractCegarLoop]: === Iteration 469 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:50,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:50,291 INFO L82 PathProgramCache]: Analyzing trace with hash -221127041, now seen corresponding path program 457 times [2021-05-22 02:26:50,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:50,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903589672] [2021-05-22 02:26:50,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:50,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:50,372 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:50,372 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:50,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903589672] [2021-05-22 02:26:50,373 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903589672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:50,373 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712399536] [2021-05-22 02:26:50,373 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 458 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 458 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:50,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:50,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:50,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:50,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:50,432 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:50,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:50,434 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:50,442 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:50,443 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:50,443 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:50,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:50,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:50,479 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:50,479 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:50,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:50,481 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:50,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:50,490 INFO L518 ElimStorePlain]: Eliminatee v_prenex_95 vanished before elimination [2021-05-22 02:26:50,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:50,490 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:26:50,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:50,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712399536] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:50,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:50,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:26:50,561 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223462419] [2021-05-22 02:26:50,561 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:26:50,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:50,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:26:50,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:50,562 INFO L87 Difference]: Start difference. First operand 472 states and 1485 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:50,966 INFO L93 Difference]: Finished difference Result 760 states and 2324 transitions. [2021-05-22 02:26:50,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:26:50,966 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:50,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:50,967 INFO L225 Difference]: With dead ends: 760 [2021-05-22 02:26:50,967 INFO L226 Difference]: Without dead ends: 733 [2021-05-22 02:26:50,967 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 356.3ms TimeCoverageRelationStatistics Valid=120, Invalid=480, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:50,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 733 states. [2021-05-22 02:26:50,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 733 to 490. [2021-05-22 02:26:50,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.1595092024539877) internal successors, (1545), 489 states have internal predecessors, (1545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1545 transitions. [2021-05-22 02:26:50,973 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1545 transitions. Word has length 21 [2021-05-22 02:26:50,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:50,973 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1545 transitions. [2021-05-22 02:26:50,973 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:50,973 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1545 transitions. [2021-05-22 02:26:50,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:50,973 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:50,973 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:51,174 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2306,458 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:51,174 INFO L430 AbstractCegarLoop]: === Iteration 470 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:51,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:51,174 INFO L82 PathProgramCache]: Analyzing trace with hash 2113093289, now seen corresponding path program 458 times [2021-05-22 02:26:51,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:51,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020291708] [2021-05-22 02:26:51,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:51,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:51,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:51,265 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:51,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020291708] [2021-05-22 02:26:51,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020291708] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:51,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063736952] [2021-05-22 02:26:51,265 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 459 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 459 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:51,290 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:51,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:51,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:51,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:51,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:51,340 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:51,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:51,343 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:51,357 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:51,358 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:51,358 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:26:51,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:51,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:51,406 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:51,411 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:51,413 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:51,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:51,414 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:51,419 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:51,420 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:51,420 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:26:51,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:51,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2063736952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:51,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:51,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:51,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936816804] [2021-05-22 02:26:51,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:51,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:51,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:51,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:51,465 INFO L87 Difference]: Start difference. First operand 490 states and 1545 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:51,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:51,822 INFO L93 Difference]: Finished difference Result 762 states and 2349 transitions. [2021-05-22 02:26:51,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:26:51,822 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:51,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:51,823 INFO L225 Difference]: With dead ends: 762 [2021-05-22 02:26:51,823 INFO L226 Difference]: Without dead ends: 743 [2021-05-22 02:26:51,824 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 251.6ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:26:51,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 743 states. [2021-05-22 02:26:51,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 743 to 488. [2021-05-22 02:26:51,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.162217659137577) internal successors, (1540), 487 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:51,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1540 transitions. [2021-05-22 02:26:51,829 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1540 transitions. Word has length 21 [2021-05-22 02:26:51,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:51,829 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1540 transitions. [2021-05-22 02:26:51,829 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:51,829 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1540 transitions. [2021-05-22 02:26:51,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:51,830 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:51,830 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:52,030 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2317,459 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:52,030 INFO L430 AbstractCegarLoop]: === Iteration 471 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:52,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:52,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1636501353, now seen corresponding path program 459 times [2021-05-22 02:26:52,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:52,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664614282] [2021-05-22 02:26:52,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:52,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:52,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:52,103 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:52,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664614282] [2021-05-22 02:26:52,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664614282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:52,103 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1945634116] [2021-05-22 02:26:52,103 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 460 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 460 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:52,128 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:52,128 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:52,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:52,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:52,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:52,162 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:52,165 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:52,174 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:52,174 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:52,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:52,230 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:52,233 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:52,233 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,233 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:26:52,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:52,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1945634116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:52,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:52,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:26:52,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543650890] [2021-05-22 02:26:52,243 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:26:52,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:52,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:26:52,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:52,243 INFO L87 Difference]: Start difference. First operand 488 states and 1540 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:52,430 INFO L93 Difference]: Finished difference Result 632 states and 1942 transitions. [2021-05-22 02:26:52,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:52,431 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:52,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:52,431 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:26:52,431 INFO L226 Difference]: Without dead ends: 611 [2021-05-22 02:26:52,432 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 135.4ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:52,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-05-22 02:26:52,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 484. [2021-05-22 02:26:52,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1635610766045548) internal successors, (1528), 483 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1528 transitions. [2021-05-22 02:26:52,437 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1528 transitions. Word has length 21 [2021-05-22 02:26:52,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:52,437 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1528 transitions. [2021-05-22 02:26:52,437 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,437 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1528 transitions. [2021-05-22 02:26:52,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:52,437 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:52,438 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:52,638 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 460 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2321 [2021-05-22 02:26:52,638 INFO L430 AbstractCegarLoop]: === Iteration 472 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:52,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:52,638 INFO L82 PathProgramCache]: Analyzing trace with hash 939481261, now seen corresponding path program 460 times [2021-05-22 02:26:52,638 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:52,638 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2043511200] [2021-05-22 02:26:52,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:52,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:52,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:52,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:52,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2043511200] [2021-05-22 02:26:52,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2043511200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:52,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1147591728] [2021-05-22 02:26:52,715 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 461 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 461 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:52,739 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:52,740 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:52,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:52,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:52,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:52,774 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,775 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:52,776 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,784 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:52,785 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:52,785 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:26:52,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:52,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:52,822 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:52,823 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:52,823 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:26:52,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:52,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1147591728] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:52,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:52,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:52,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [265730432] [2021-05-22 02:26:52,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:52,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:52,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:52,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:52,838 INFO L87 Difference]: Start difference. First operand 484 states and 1528 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:52,967 INFO L93 Difference]: Finished difference Result 610 states and 1881 transitions. [2021-05-22 02:26:52,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:52,967 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:52,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:52,968 INFO L225 Difference]: With dead ends: 610 [2021-05-22 02:26:52,968 INFO L226 Difference]: Without dead ends: 589 [2021-05-22 02:26:52,968 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 110.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:52,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-22 02:26:52,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 467. [2021-05-22 02:26:52,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.143776824034335) internal successors, (1465), 466 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1465 transitions. [2021-05-22 02:26:52,973 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1465 transitions. Word has length 21 [2021-05-22 02:26:52,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:52,973 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1465 transitions. [2021-05-22 02:26:52,973 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:52,973 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1465 transitions. [2021-05-22 02:26:52,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:52,974 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:52,974 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:53,174 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 461 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2327 [2021-05-22 02:26:53,174 INFO L430 AbstractCegarLoop]: === Iteration 473 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:53,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:53,174 INFO L82 PathProgramCache]: Analyzing trace with hash 594236309, now seen corresponding path program 461 times [2021-05-22 02:26:53,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:53,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207077163] [2021-05-22 02:26:53,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:53,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:53,261 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:53,261 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:53,261 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207077163] [2021-05-22 02:26:53,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207077163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:53,262 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801945449] [2021-05-22 02:26:53,262 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 462 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 462 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:53,286 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:53,286 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:53,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:53,287 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:53,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:53,333 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:53,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:53,336 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:53,351 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:53,352 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:53,352 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:57, output treesize:43 [2021-05-22 02:26:53,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:26:53,417 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:53,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:53,419 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:53,428 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:53,428 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:53,429 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:53,429 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:26:53,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:53,472 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801945449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:53,472 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:53,472 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:26:53,472 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772144149] [2021-05-22 02:26:53,473 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:26:53,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:53,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:26:53,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:53,473 INFO L87 Difference]: Start difference. First operand 467 states and 1465 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:53,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:53,952 INFO L93 Difference]: Finished difference Result 761 states and 2348 transitions. [2021-05-22 02:26:53,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:26:53,952 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:53,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:53,953 INFO L225 Difference]: With dead ends: 761 [2021-05-22 02:26:53,953 INFO L226 Difference]: Without dead ends: 742 [2021-05-22 02:26:53,953 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 411.4ms TimeCoverageRelationStatistics Valid=127, Invalid=523, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:26:53,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-22 02:26:53,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 476. [2021-05-22 02:26:53,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.136842105263158) internal successors, (1490), 475 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:53,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1490 transitions. [2021-05-22 02:26:53,959 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1490 transitions. Word has length 21 [2021-05-22 02:26:53,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:53,959 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1490 transitions. [2021-05-22 02:26:53,959 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:53,959 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1490 transitions. [2021-05-22 02:26:53,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:53,959 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:53,959 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:54,160 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2330,462 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:54,160 INFO L430 AbstractCegarLoop]: === Iteration 474 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:54,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:54,160 INFO L82 PathProgramCache]: Analyzing trace with hash -1439400171, now seen corresponding path program 462 times [2021-05-22 02:26:54,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:54,160 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1880575055] [2021-05-22 02:26:54,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:54,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:54,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:54,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:54,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1880575055] [2021-05-22 02:26:54,240 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1880575055] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:54,240 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769493510] [2021-05-22 02:26:54,240 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 463 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 463 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:54,264 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:26:54,265 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:54,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:54,265 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:54,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:54,329 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,333 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:54,333 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,334 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:26:54,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:54,353 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:54,356 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:54,356 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,356 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:26:54,368 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:54,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769493510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:54,368 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:54,368 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:54,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417740950] [2021-05-22 02:26:54,368 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:54,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:54,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:54,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:54,368 INFO L87 Difference]: Start difference. First operand 476 states and 1490 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:54,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:54,514 INFO L93 Difference]: Finished difference Result 646 states and 1990 transitions. [2021-05-22 02:26:54,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:54,514 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:54,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:54,515 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:26:54,515 INFO L226 Difference]: Without dead ends: 627 [2021-05-22 02:26:54,515 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 125.8ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:54,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-05-22 02:26:54,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 472. [2021-05-22 02:26:54,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.129511677282378) internal successors, (1474), 471 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:54,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1474 transitions. [2021-05-22 02:26:54,520 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1474 transitions. Word has length 21 [2021-05-22 02:26:54,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:54,520 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1474 transitions. [2021-05-22 02:26:54,520 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:54,520 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1474 transitions. [2021-05-22 02:26:54,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:54,521 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:54,521 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:54,721 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2337,463 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:54,721 INFO L430 AbstractCegarLoop]: === Iteration 475 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:54,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:54,721 INFO L82 PathProgramCache]: Analyzing trace with hash -821138003, now seen corresponding path program 463 times [2021-05-22 02:26:54,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:54,722 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360989546] [2021-05-22 02:26:54,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:54,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:54,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:54,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:54,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360989546] [2021-05-22 02:26:54,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360989546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:54,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427819348] [2021-05-22 02:26:54,806 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 464 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 464 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:54,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:54,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:54,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:54,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:54,880 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:54,884 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,884 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:26:54,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:54,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,905 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:54,905 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:54,905 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:54,905 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:26:54,918 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:54,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427819348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:54,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:54,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:26:54,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396151181] [2021-05-22 02:26:54,918 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:26:54,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:54,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:26:54,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:26:54,919 INFO L87 Difference]: Start difference. First operand 472 states and 1474 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:55,036 INFO L93 Difference]: Finished difference Result 644 states and 1970 transitions. [2021-05-22 02:26:55,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:55,036 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:55,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:55,037 INFO L225 Difference]: With dead ends: 644 [2021-05-22 02:26:55,037 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:26:55,037 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 100.3ms TimeCoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:26:55,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:26:55,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 456. [2021-05-22 02:26:55,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1164835164835165) internal successors, (1418), 455 states have internal predecessors, (1418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1418 transitions. [2021-05-22 02:26:55,042 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1418 transitions. Word has length 21 [2021-05-22 02:26:55,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:55,042 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1418 transitions. [2021-05-22 02:26:55,042 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,042 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1418 transitions. [2021-05-22 02:26:55,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:55,042 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:55,042 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:55,243 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 464 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2340 [2021-05-22 02:26:55,243 INFO L430 AbstractCegarLoop]: === Iteration 476 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:55,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:55,243 INFO L82 PathProgramCache]: Analyzing trace with hash 856074901, now seen corresponding path program 464 times [2021-05-22 02:26:55,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:55,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20291829] [2021-05-22 02:26:55,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:55,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:55,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:55,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:55,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20291829] [2021-05-22 02:26:55,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20291829] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:55,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1958400588] [2021-05-22 02:26:55,310 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 465 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 465 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:55,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:55,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:55,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:55,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:55,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:55,358 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,361 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:55,361 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,361 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:26:55,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:55,373 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,376 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:55,376 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:55,377 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,377 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:26:55,389 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:55,389 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1958400588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:55,389 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:55,389 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:26:55,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716502701] [2021-05-22 02:26:55,389 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:26:55,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:55,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:26:55,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:26:55,389 INFO L87 Difference]: Start difference. First operand 456 states and 1418 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:55,481 INFO L93 Difference]: Finished difference Result 704 states and 2148 transitions. [2021-05-22 02:26:55,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:55,481 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:55,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:55,482 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:26:55,482 INFO L226 Difference]: Without dead ends: 685 [2021-05-22 02:26:55,482 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 72.5ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:26:55,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2021-05-22 02:26:55,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 449. [2021-05-22 02:26:55,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1183035714285716) internal successors, (1397), 448 states have internal predecessors, (1397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1397 transitions. [2021-05-22 02:26:55,487 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1397 transitions. Word has length 21 [2021-05-22 02:26:55,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:55,487 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1397 transitions. [2021-05-22 02:26:55,487 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:55,487 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1397 transitions. [2021-05-22 02:26:55,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:55,488 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:55,488 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:55,688 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 465 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2342 [2021-05-22 02:26:55,688 INFO L430 AbstractCegarLoop]: === Iteration 477 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:55,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:55,688 INFO L82 PathProgramCache]: Analyzing trace with hash -1218485357, now seen corresponding path program 465 times [2021-05-22 02:26:55,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:55,689 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1624321916] [2021-05-22 02:26:55,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:55,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:55,775 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:55,775 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:55,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1624321916] [2021-05-22 02:26:55,775 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1624321916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:55,775 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1829235241] [2021-05-22 02:26:55,775 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 466 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 466 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:55,800 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:55,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:55,800 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:55,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:55,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:55,821 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:55,824 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,824 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:26:55,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:55,844 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:55,847 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:55,853 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:55,853 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:55,853 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:55,853 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:26:55,870 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:55,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1829235241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:55,870 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:55,870 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:26:55,870 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91165102] [2021-05-22 02:26:55,870 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:26:55,871 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:55,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:26:55,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:26:55,871 INFO L87 Difference]: Start difference. First operand 449 states and 1397 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:56,013 INFO L93 Difference]: Finished difference Result 710 states and 2167 transitions. [2021-05-22 02:26:56,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:56,013 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:56,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:56,014 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:26:56,014 INFO L226 Difference]: Without dead ends: 663 [2021-05-22 02:26:56,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 108.0ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:56,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2021-05-22 02:26:56,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 449. [2021-05-22 02:26:56,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.1183035714285716) internal successors, (1397), 448 states have internal predecessors, (1397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1397 transitions. [2021-05-22 02:26:56,019 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1397 transitions. Word has length 21 [2021-05-22 02:26:56,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:56,019 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1397 transitions. [2021-05-22 02:26:56,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,019 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1397 transitions. [2021-05-22 02:26:56,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:56,020 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:56,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:56,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 466 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2344 [2021-05-22 02:26:56,220 INFO L430 AbstractCegarLoop]: === Iteration 478 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:56,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:56,220 INFO L82 PathProgramCache]: Analyzing trace with hash 1981783021, now seen corresponding path program 466 times [2021-05-22 02:26:56,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:56,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644507406] [2021-05-22 02:26:56,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:56,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:56,292 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:56,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:56,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644507406] [2021-05-22 02:26:56,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644507406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:56,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116695511] [2021-05-22 02:26:56,292 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 467 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 467 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:56,336 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:26:56,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:56,337 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:56,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:56,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:56,365 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:56,366 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:56,369 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:56,369 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:26:56,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:56,389 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:56,390 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:56,397 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:56,397 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:56,397 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:26:56,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:56,425 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116695511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:56,425 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:56,425 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:26:56,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473097008] [2021-05-22 02:26:56,425 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:26:56,425 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:56,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:26:56,426 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:26:56,426 INFO L87 Difference]: Start difference. First operand 449 states and 1397 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:56,598 INFO L93 Difference]: Finished difference Result 775 states and 2375 transitions. [2021-05-22 02:26:56,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:56,598 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:56,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:56,599 INFO L225 Difference]: With dead ends: 775 [2021-05-22 02:26:56,599 INFO L226 Difference]: Without dead ends: 748 [2021-05-22 02:26:56,599 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 127.5ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:56,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-05-22 02:26:56,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 474. [2021-05-22 02:26:56,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.116279069767442) internal successors, (1474), 473 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1474 transitions. [2021-05-22 02:26:56,605 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1474 transitions. Word has length 21 [2021-05-22 02:26:56,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:56,606 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1474 transitions. [2021-05-22 02:26:56,606 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:56,606 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1474 transitions. [2021-05-22 02:26:56,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:56,606 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:56,606 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:56,806 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2347,467 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:56,807 INFO L430 AbstractCegarLoop]: === Iteration 479 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:56,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:56,807 INFO L82 PathProgramCache]: Analyzing trace with hash -432431337, now seen corresponding path program 467 times [2021-05-22 02:26:56,807 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:56,807 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2085394302] [2021-05-22 02:26:56,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:56,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:56,870 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:56,870 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:56,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2085394302] [2021-05-22 02:26:56,870 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2085394302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:56,870 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744780351] [2021-05-22 02:26:56,870 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 468 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 468 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:56,895 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:26:56,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:56,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:26:56,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:56,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:56,920 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:56,922 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,924 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:56,925 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:56,925 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:26:56,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:56,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:56,951 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:56,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:56,962 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:56,963 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:56,963 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:25 [2021-05-22 02:26:57,008 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:57,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [744780351] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:57,008 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:57,008 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:26:57,008 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1341531357] [2021-05-22 02:26:57,008 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:26:57,008 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:57,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:26:57,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:26:57,009 INFO L87 Difference]: Start difference. First operand 474 states and 1474 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:57,258 INFO L93 Difference]: Finished difference Result 747 states and 2287 transitions. [2021-05-22 02:26:57,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:26:57,258 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:57,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:57,259 INFO L225 Difference]: With dead ends: 747 [2021-05-22 02:26:57,259 INFO L226 Difference]: Without dead ends: 726 [2021-05-22 02:26:57,260 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 166.4ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:26:57,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2021-05-22 02:26:57,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 471. [2021-05-22 02:26:57,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.119148936170213) internal successors, (1466), 470 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1466 transitions. [2021-05-22 02:26:57,265 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1466 transitions. Word has length 21 [2021-05-22 02:26:57,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:57,265 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1466 transitions. [2021-05-22 02:26:57,265 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,265 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1466 transitions. [2021-05-22 02:26:57,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:57,266 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:57,266 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:57,466 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 468 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2354 [2021-05-22 02:26:57,466 INFO L430 AbstractCegarLoop]: === Iteration 480 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:57,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:57,466 INFO L82 PathProgramCache]: Analyzing trace with hash 73914929, now seen corresponding path program 468 times [2021-05-22 02:26:57,466 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:57,467 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [858152389] [2021-05-22 02:26:57,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:57,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:57,526 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:57,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:57,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [858152389] [2021-05-22 02:26:57,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [858152389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:57,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2048501042] [2021-05-22 02:26:57,526 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 469 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 469 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:57,551 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:26:57,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:57,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:57,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:57,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:57,576 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:57,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:57,578 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:57,580 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:57,581 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:57,581 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:26:57,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:57,593 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:57,595 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:57,595 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:57,596 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:57,596 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:26:57,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:57,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2048501042] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:57,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:57,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:26:57,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536596201] [2021-05-22 02:26:57,606 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:26:57,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:57,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:26:57,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:26:57,606 INFO L87 Difference]: Start difference. First operand 471 states and 1466 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:57,727 INFO L93 Difference]: Finished difference Result 793 states and 2399 transitions. [2021-05-22 02:26:57,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:57,728 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:57,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:57,729 INFO L225 Difference]: With dead ends: 793 [2021-05-22 02:26:57,729 INFO L226 Difference]: Without dead ends: 772 [2021-05-22 02:26:57,729 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:26:57,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-22 02:26:57,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 444. [2021-05-22 02:26:57,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.124153498871332) internal successors, (1384), 443 states have internal predecessors, (1384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1384 transitions. [2021-05-22 02:26:57,735 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1384 transitions. Word has length 21 [2021-05-22 02:26:57,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:57,735 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1384 transitions. [2021-05-22 02:26:57,735 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:57,735 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1384 transitions. [2021-05-22 02:26:57,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:57,735 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:57,735 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:57,936 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2359,469 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:57,936 INFO L430 AbstractCegarLoop]: === Iteration 481 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:57,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:57,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1978494773, now seen corresponding path program 469 times [2021-05-22 02:26:57,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:57,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657777289] [2021-05-22 02:26:57,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:57,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:58,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:58,013 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:58,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657777289] [2021-05-22 02:26:58,013 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657777289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:58,013 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1115864188] [2021-05-22 02:26:58,013 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 470 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 470 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:58,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:58,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:58,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:58,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:58,055 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,058 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,059 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:26:58,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:26:58,081 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:26:58,083 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,091 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:58,092 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:58,092 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:26:58,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:58,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1115864188] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:58,124 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:58,124 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:26:58,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1652348511] [2021-05-22 02:26:58,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:26:58,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:58,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:26:58,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:26:58,125 INFO L87 Difference]: Start difference. First operand 444 states and 1384 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:58,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:58,286 INFO L93 Difference]: Finished difference Result 730 states and 2220 transitions. [2021-05-22 02:26:58,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:26:58,286 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:58,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:58,287 INFO L225 Difference]: With dead ends: 730 [2021-05-22 02:26:58,287 INFO L226 Difference]: Without dead ends: 683 [2021-05-22 02:26:58,287 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 124.1ms TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:26:58,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2021-05-22 02:26:58,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 447. [2021-05-22 02:26:58,291 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 447 states, 446 states have (on average 3.1367713004484306) internal successors, (1399), 446 states have internal predecessors, (1399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:58,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 447 states to 447 states and 1399 transitions. [2021-05-22 02:26:58,292 INFO L78 Accepts]: Start accepts. Automaton has 447 states and 1399 transitions. Word has length 21 [2021-05-22 02:26:58,292 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:58,292 INFO L482 AbstractCegarLoop]: Abstraction has 447 states and 1399 transitions. [2021-05-22 02:26:58,292 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:58,292 INFO L276 IsEmpty]: Start isEmpty. Operand 447 states and 1399 transitions. [2021-05-22 02:26:58,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:58,293 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:58,293 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:58,493 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2362,470 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:58,493 INFO L430 AbstractCegarLoop]: === Iteration 482 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:58,493 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:58,493 INFO L82 PathProgramCache]: Analyzing trace with hash -1681228363, now seen corresponding path program 470 times [2021-05-22 02:26:58,494 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:58,494 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792532052] [2021-05-22 02:26:58,494 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:58,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:58,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:58,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:58,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792532052] [2021-05-22 02:26:58,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1792532052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:58,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1690269761] [2021-05-22 02:26:58,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 471 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 471 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:58,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:26:58,612 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:58,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:58,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:58,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:58,647 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:58,649 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,661 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,662 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:26:58,662 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:26:58,717 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_98, v_prenex_97], 1=[o_0, o_4]} [2021-05-22 02:26:58,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:58,721 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,733 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,733 INFO L518 ElimStorePlain]: Eliminatee v_prenex_97 vanished before elimination [2021-05-22 02:26:58,735 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:58,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:58,736 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:26:58,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:26:58,749 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:58,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:58,760 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:58,760 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:26:58,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:58,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1690269761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:58,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:58,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:26:58,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [348263902] [2021-05-22 02:26:58,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:26:58,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:58,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:26:58,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:26:58,837 INFO L87 Difference]: Start difference. First operand 447 states and 1399 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:59,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:26:59,331 INFO L93 Difference]: Finished difference Result 946 states and 2886 transitions. [2021-05-22 02:26:59,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:26:59,331 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:26:59,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:26:59,332 INFO L225 Difference]: With dead ends: 946 [2021-05-22 02:26:59,332 INFO L226 Difference]: Without dead ends: 923 [2021-05-22 02:26:59,332 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 430.1ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:26:59,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 923 states. [2021-05-22 02:26:59,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 923 to 472. [2021-05-22 02:26:59,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.159235668789809) internal successors, (1488), 471 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:59,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1488 transitions. [2021-05-22 02:26:59,338 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1488 transitions. Word has length 21 [2021-05-22 02:26:59,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:26:59,338 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1488 transitions. [2021-05-22 02:26:59,339 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:26:59,339 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1488 transitions. [2021-05-22 02:26:59,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:26:59,339 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:26:59,339 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:26:59,539 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 471 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2365 [2021-05-22 02:26:59,540 INFO L430 AbstractCegarLoop]: === Iteration 483 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:26:59,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:26:59,540 INFO L82 PathProgramCache]: Analyzing trace with hash -1965491047, now seen corresponding path program 471 times [2021-05-22 02:26:59,540 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:26:59,540 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289459964] [2021-05-22 02:26:59,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:26:59,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:26:59,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:59,623 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:26:59,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289459964] [2021-05-22 02:26:59,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289459964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:59,623 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027363308] [2021-05-22 02:26:59,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 472 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 472 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:26:59,648 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:26:59,648 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:26:59,648 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:26:59,649 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:26:59,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:26:59,670 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:59,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:59,672 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:59,678 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:59,679 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:59,679 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:26:59,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:26:59,715 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:59,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:26:59,718 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:26:59,726 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:26:59,726 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:26:59,727 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:26:59,727 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:26:59,798 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:26:59,799 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027363308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:26:59,799 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:26:59,799 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:26:59,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590539893] [2021-05-22 02:26:59,799 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:26:59,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:26:59,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:26:59,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:26:59,799 INFO L87 Difference]: Start difference. First operand 472 states and 1488 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:00,323 INFO L93 Difference]: Finished difference Result 946 states and 2879 transitions. [2021-05-22 02:27:00,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:27:00,323 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:00,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:00,324 INFO L225 Difference]: With dead ends: 946 [2021-05-22 02:27:00,324 INFO L226 Difference]: Without dead ends: 919 [2021-05-22 02:27:00,325 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 438.5ms TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:27:00,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 919 states. [2021-05-22 02:27:00,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 919 to 502. [2021-05-22 02:27:00,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1716566866267466) internal successors, (1589), 501 states have internal predecessors, (1589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1589 transitions. [2021-05-22 02:27:00,331 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1589 transitions. Word has length 21 [2021-05-22 02:27:00,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:00,331 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1589 transitions. [2021-05-22 02:27:00,331 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,331 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1589 transitions. [2021-05-22 02:27:00,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:00,331 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:00,331 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:00,532 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2374,472 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:00,532 INFO L430 AbstractCegarLoop]: === Iteration 484 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:00,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:00,532 INFO L82 PathProgramCache]: Analyzing trace with hash 368729283, now seen corresponding path program 472 times [2021-05-22 02:27:00,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:00,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681117083] [2021-05-22 02:27:00,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:00,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:00,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:00,611 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:00,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681117083] [2021-05-22 02:27:00,611 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [681117083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:00,611 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1652530464] [2021-05-22 02:27:00,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 473 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 473 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:00,635 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:00,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:00,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:00,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:00,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:00,671 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:00,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:00,673 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:00,684 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:00,685 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:27:00,686 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:27:00,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:00,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:00,755 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:00,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:00,762 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:00,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:00,763 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:00,769 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:00,769 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:00,769 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:27:00,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:00,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1652530464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:00,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:00,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:00,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118488103] [2021-05-22 02:27:00,785 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:00,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:00,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:00,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:00,785 INFO L87 Difference]: Start difference. First operand 502 states and 1589 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:00,989 INFO L93 Difference]: Finished difference Result 851 states and 2617 transitions. [2021-05-22 02:27:00,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:00,989 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:00,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:00,990 INFO L225 Difference]: With dead ends: 851 [2021-05-22 02:27:00,990 INFO L226 Difference]: Without dead ends: 832 [2021-05-22 02:27:00,991 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 157.1ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:00,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 832 states. [2021-05-22 02:27:00,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 832 to 500. [2021-05-22 02:27:00,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.1743486973947896) internal successors, (1584), 499 states have internal predecessors, (1584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1584 transitions. [2021-05-22 02:27:00,997 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1584 transitions. Word has length 21 [2021-05-22 02:27:00,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:00,997 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1584 transitions. [2021-05-22 02:27:00,997 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:00,997 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1584 transitions. [2021-05-22 02:27:00,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:00,997 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:00,997 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:01,198 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2384,473 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:01,198 INFO L430 AbstractCegarLoop]: === Iteration 485 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:01,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:01,198 INFO L82 PathProgramCache]: Analyzing trace with hash 914101937, now seen corresponding path program 473 times [2021-05-22 02:27:01,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:01,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072525638] [2021-05-22 02:27:01,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:01,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:01,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:01,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:01,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072525638] [2021-05-22 02:27:01,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072525638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:01,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [212700357] [2021-05-22 02:27:01,269 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 474 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 474 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:01,293 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:01,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:01,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:01,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:01,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:01,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:01,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:01,318 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:01,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:01,324 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:01,325 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:01,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:01,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:01,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:01,393 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:01,405 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:01,405 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:01,405 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:01,405 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:25 [2021-05-22 02:27:01,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:01,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [212700357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:01,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:01,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:01,454 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124498461] [2021-05-22 02:27:01,454 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:01,454 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:01,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:01,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:01,455 INFO L87 Difference]: Start difference. First operand 500 states and 1584 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:01,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:01,730 INFO L93 Difference]: Finished difference Result 821 states and 2508 transitions. [2021-05-22 02:27:01,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:27:01,731 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:01,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:01,732 INFO L225 Difference]: With dead ends: 821 [2021-05-22 02:27:01,732 INFO L226 Difference]: Without dead ends: 800 [2021-05-22 02:27:01,732 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 235.2ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:27:01,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-05-22 02:27:01,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 496. [2021-05-22 02:27:01,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 495 states have (on average 3.1737373737373735) internal successors, (1571), 495 states have internal predecessors, (1571), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:01,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 1571 transitions. [2021-05-22 02:27:01,741 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 1571 transitions. Word has length 21 [2021-05-22 02:27:01,741 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:01,741 INFO L482 AbstractCegarLoop]: Abstraction has 496 states and 1571 transitions. [2021-05-22 02:27:01,741 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:01,741 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 1571 transitions. [2021-05-22 02:27:01,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:01,742 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:01,742 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:01,956 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 474 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2388 [2021-05-22 02:27:01,957 INFO L430 AbstractCegarLoop]: === Iteration 486 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:01,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:01,957 INFO L82 PathProgramCache]: Analyzing trace with hash 1853818609, now seen corresponding path program 474 times [2021-05-22 02:27:01,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:01,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883834264] [2021-05-22 02:27:01,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:01,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:02,034 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:02,034 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:02,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883834264] [2021-05-22 02:27:02,035 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883834264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:02,035 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196775240] [2021-05-22 02:27:02,035 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 475 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 475 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:02,060 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:27:02,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:02,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:02,061 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:02,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:02,096 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:02,098 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:02,111 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:27:02,111 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:27:02,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:02,156 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,160 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:02,160 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:02,160 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,161 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:02,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:02,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196775240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:02,203 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:02,203 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:02,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229768038] [2021-05-22 02:27:02,203 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:02,203 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:02,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:02,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:02,203 INFO L87 Difference]: Start difference. First operand 496 states and 1571 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:02,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:02,596 INFO L93 Difference]: Finished difference Result 1016 states and 3106 transitions. [2021-05-22 02:27:02,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:02,597 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:02,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:02,598 INFO L225 Difference]: With dead ends: 1016 [2021-05-22 02:27:02,598 INFO L226 Difference]: Without dead ends: 997 [2021-05-22 02:27:02,598 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 278.8ms TimeCoverageRelationStatistics Valid=114, Invalid=438, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:27:02,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 997 states. [2021-05-22 02:27:02,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 997 to 474. [2021-05-22 02:27:02,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.156448202959831) internal successors, (1493), 473 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:02,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1493 transitions. [2021-05-22 02:27:02,604 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1493 transitions. Word has length 21 [2021-05-22 02:27:02,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:02,604 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1493 transitions. [2021-05-22 02:27:02,605 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:02,605 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1493 transitions. [2021-05-22 02:27:02,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:02,605 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:02,605 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:02,805 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2396,475 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:02,806 INFO L430 AbstractCegarLoop]: === Iteration 487 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:02,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:02,806 INFO L82 PathProgramCache]: Analyzing trace with hash -1703652455, now seen corresponding path program 475 times [2021-05-22 02:27:02,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:02,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520693558] [2021-05-22 02:27:02,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:02,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:02,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:02,878 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:02,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520693558] [2021-05-22 02:27:02,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520693558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:02,878 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [119276480] [2021-05-22 02:27:02,878 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 476 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 476 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:02,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:02,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:02,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:02,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:02,922 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:02,924 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,930 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:02,931 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:02,931 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:02,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:02,964 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,967 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:02,967 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:02,967 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:02,967 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:02,977 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:02,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [119276480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:02,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:02,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:02,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184001068] [2021-05-22 02:27:02,977 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:02,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:02,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:02,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:02,977 INFO L87 Difference]: Start difference. First operand 474 states and 1493 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:03,145 INFO L93 Difference]: Finished difference Result 826 states and 2491 transitions. [2021-05-22 02:27:03,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:03,146 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:03,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:03,147 INFO L225 Difference]: With dead ends: 826 [2021-05-22 02:27:03,147 INFO L226 Difference]: Without dead ends: 805 [2021-05-22 02:27:03,147 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 118.0ms TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:03,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 805 states. [2021-05-22 02:27:03,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 805 to 442. [2021-05-22 02:27:03,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 442 states, 441 states have (on average 3.120181405895692) internal successors, (1376), 441 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 442 states to 442 states and 1376 transitions. [2021-05-22 02:27:03,153 INFO L78 Accepts]: Start accepts. Automaton has 442 states and 1376 transitions. Word has length 21 [2021-05-22 02:27:03,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:03,153 INFO L482 AbstractCegarLoop]: Abstraction has 442 states and 1376 transitions. [2021-05-22 02:27:03,153 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,153 INFO L276 IsEmpty]: Start isEmpty. Operand 442 states and 1376 transitions. [2021-05-22 02:27:03,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:03,153 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:03,153 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:03,354 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 476 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2400 [2021-05-22 02:27:03,354 INFO L430 AbstractCegarLoop]: === Iteration 488 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:03,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:03,354 INFO L82 PathProgramCache]: Analyzing trace with hash 293731731, now seen corresponding path program 476 times [2021-05-22 02:27:03,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:03,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [103513460] [2021-05-22 02:27:03,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:03,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:03,430 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:03,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:03,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [103513460] [2021-05-22 02:27:03,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [103513460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:03,431 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168978052] [2021-05-22 02:27:03,431 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 477 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 477 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:03,455 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:03,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:03,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:03,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:03,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:03,490 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:03,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:03,493 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:03,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:03,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:03,502 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:03,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:03,540 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:03,543 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:03,543 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:03,543 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:03,544 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:03,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:03,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168978052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:03,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:03,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:03,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133307501] [2021-05-22 02:27:03,557 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:03,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:03,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:03,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:03,557 INFO L87 Difference]: Start difference. First operand 442 states and 1376 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:03,699 INFO L93 Difference]: Finished difference Result 549 states and 1688 transitions. [2021-05-22 02:27:03,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:03,699 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:03,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:03,700 INFO L225 Difference]: With dead ends: 549 [2021-05-22 02:27:03,700 INFO L226 Difference]: Without dead ends: 527 [2021-05-22 02:27:03,700 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 143.5ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:03,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-05-22 02:27:03,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 454. [2021-05-22 02:27:03,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.123620309050773) internal successors, (1415), 453 states have internal predecessors, (1415), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1415 transitions. [2021-05-22 02:27:03,705 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1415 transitions. Word has length 21 [2021-05-22 02:27:03,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:03,705 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1415 transitions. [2021-05-22 02:27:03,705 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:03,705 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1415 transitions. [2021-05-22 02:27:03,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:03,705 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:03,705 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:03,906 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2406,477 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:03,906 INFO L430 AbstractCegarLoop]: === Iteration 489 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:03,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:03,906 INFO L82 PathProgramCache]: Analyzing trace with hash 919055849, now seen corresponding path program 477 times [2021-05-22 02:27:03,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:03,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290884733] [2021-05-22 02:27:03,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:03,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:03,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:03,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:03,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290884733] [2021-05-22 02:27:03,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290884733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:03,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1498553151] [2021-05-22 02:27:03,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 478 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 478 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:04,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:04,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:04,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:04,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:04,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:04,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:04,050 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,050 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:27:04,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:04,088 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:04,090 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,096 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:04,096 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:04,097 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:04,097 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:27:04,140 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:04,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1498553151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:04,140 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:04,140 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:04,140 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853233529] [2021-05-22 02:27:04,140 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:04,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:04,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:04,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:04,141 INFO L87 Difference]: Start difference. First operand 454 states and 1415 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:04,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:04,414 INFO L93 Difference]: Finished difference Result 666 states and 2042 transitions. [2021-05-22 02:27:04,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:27:04,415 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:04,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:04,416 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:27:04,416 INFO L226 Difference]: Without dead ends: 639 [2021-05-22 02:27:04,416 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 212.8ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:27:04,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-22 02:27:04,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 454. [2021-05-22 02:27:04,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.119205298013245) internal successors, (1413), 453 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:04,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1413 transitions. [2021-05-22 02:27:04,421 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1413 transitions. Word has length 21 [2021-05-22 02:27:04,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:04,421 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1413 transitions. [2021-05-22 02:27:04,421 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:04,421 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1413 transitions. [2021-05-22 02:27:04,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:04,422 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:04,422 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:04,622 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 478 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2409 [2021-05-22 02:27:04,622 INFO L430 AbstractCegarLoop]: === Iteration 490 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:04,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:04,622 INFO L82 PathProgramCache]: Analyzing trace with hash 634793165, now seen corresponding path program 478 times [2021-05-22 02:27:04,622 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:04,622 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742515293] [2021-05-22 02:27:04,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:04,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:04,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:04,712 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:04,712 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742515293] [2021-05-22 02:27:04,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1742515293] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:04,713 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312894331] [2021-05-22 02:27:04,713 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 479 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 479 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:04,741 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:04,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:04,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:04,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:04,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:04,777 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:04,779 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:04,788 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:04,788 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:04,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:04,837 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:04,845 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:04,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:04,847 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:04,853 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:04,853 INFO L518 ElimStorePlain]: Eliminatee v_prenex_99 vanished before elimination [2021-05-22 02:27:04,853 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:04,854 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:04,900 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:04,900 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312894331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:04,900 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:04,900 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:04,900 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427775357] [2021-05-22 02:27:04,900 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:04,900 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:04,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:04,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:04,900 INFO L87 Difference]: Start difference. First operand 454 states and 1413 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:05,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:05,380 INFO L93 Difference]: Finished difference Result 776 states and 2370 transitions. [2021-05-22 02:27:05,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:27:05,380 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:05,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:05,381 INFO L225 Difference]: With dead ends: 776 [2021-05-22 02:27:05,381 INFO L226 Difference]: Without dead ends: 749 [2021-05-22 02:27:05,381 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 389.3ms TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:27:05,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2021-05-22 02:27:05,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 470. [2021-05-22 02:27:05,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.121535181236674) internal successors, (1464), 469 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:05,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1464 transitions. [2021-05-22 02:27:05,388 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1464 transitions. Word has length 21 [2021-05-22 02:27:05,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:05,388 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1464 transitions. [2021-05-22 02:27:05,388 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:05,388 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1464 transitions. [2021-05-22 02:27:05,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:05,389 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:05,389 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:05,589 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 479 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2412 [2021-05-22 02:27:05,589 INFO L430 AbstractCegarLoop]: === Iteration 491 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:05,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:05,590 INFO L82 PathProgramCache]: Analyzing trace with hash -1973782291, now seen corresponding path program 479 times [2021-05-22 02:27:05,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:05,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421271157] [2021-05-22 02:27:05,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:05,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:05,678 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:05,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:05,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421271157] [2021-05-22 02:27:05,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421271157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:05,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1188363184] [2021-05-22 02:27:05,678 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 480 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 480 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:05,702 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:05,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:05,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:05,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:05,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:05,737 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:05,740 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:05,743 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:05,745 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:05,772 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:27:05,772 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:101, output treesize:69 [2021-05-22 02:27:05,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:05,867 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:27:05,869 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:05,877 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:05,877 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:05,878 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:05,878 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:27:05,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:05,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1188363184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:05,927 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:05,927 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:05,927 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068814453] [2021-05-22 02:27:05,927 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:05,927 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:05,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:05,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:05,927 INFO L87 Difference]: Start difference. First operand 470 states and 1464 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:06,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:06,822 INFO L93 Difference]: Finished difference Result 734 states and 2215 transitions. [2021-05-22 02:27:06,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:27:06,822 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:06,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:06,823 INFO L225 Difference]: With dead ends: 734 [2021-05-22 02:27:06,823 INFO L226 Difference]: Without dead ends: 692 [2021-05-22 02:27:06,823 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 764.9ms TimeCoverageRelationStatistics Valid=189, Invalid=681, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:27:06,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-05-22 02:27:06,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 471. [2021-05-22 02:27:06,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.129787234042553) internal successors, (1471), 470 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:06,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1471 transitions. [2021-05-22 02:27:06,829 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1471 transitions. Word has length 21 [2021-05-22 02:27:06,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:06,829 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1471 transitions. [2021-05-22 02:27:06,829 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:06,829 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1471 transitions. [2021-05-22 02:27:06,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:06,829 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:06,829 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:07,029 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 480 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2423 [2021-05-22 02:27:07,030 INFO L430 AbstractCegarLoop]: === Iteration 492 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:07,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:07,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1951277919, now seen corresponding path program 480 times [2021-05-22 02:27:07,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:07,030 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [158218532] [2021-05-22 02:27:07,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:07,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:07,102 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:07,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:07,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [158218532] [2021-05-22 02:27:07,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [158218532] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:07,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [737091508] [2021-05-22 02:27:07,102 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 481 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 481 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:07,127 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:27:07,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:07,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:07,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:07,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:07,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:07,168 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,176 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:07,177 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:07,177 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:07,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:07,203 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,213 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:07,213 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:07,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:07,215 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,223 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:07,223 INFO L518 ElimStorePlain]: Eliminatee v_prenex_102 vanished before elimination [2021-05-22 02:27:07,223 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:07,224 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:27:07,254 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:07,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [737091508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:07,255 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:07,255 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:07,255 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288056019] [2021-05-22 02:27:07,255 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:07,255 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:07,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:07,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:07,255 INFO L87 Difference]: Start difference. First operand 471 states and 1471 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:07,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:07,403 INFO L93 Difference]: Finished difference Result 613 states and 1891 transitions. [2021-05-22 02:27:07,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:07,403 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:07,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:07,404 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:27:07,404 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:27:07,404 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:07,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:27:07,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 471. [2021-05-22 02:27:07,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.129787234042553) internal successors, (1471), 470 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:07,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1471 transitions. [2021-05-22 02:27:07,409 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1471 transitions. Word has length 21 [2021-05-22 02:27:07,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:07,409 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1471 transitions. [2021-05-22 02:27:07,409 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:07,409 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1471 transitions. [2021-05-22 02:27:07,410 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:07,410 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:07,410 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:07,610 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2433,481 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:07,611 INFO L430 AbstractCegarLoop]: === Iteration 493 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:07,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:07,611 INFO L82 PathProgramCache]: Analyzing trace with hash -1654011509, now seen corresponding path program 481 times [2021-05-22 02:27:07,611 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:07,611 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138151582] [2021-05-22 02:27:07,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:07,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:07,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:07,697 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:07,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138151582] [2021-05-22 02:27:07,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138151582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:07,697 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501334336] [2021-05-22 02:27:07,697 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 482 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 482 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:07,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:07,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:07,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:07,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:07,752 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:07,757 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,757 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:27:07,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:07,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:07,782 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:07,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:07,791 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:07,791 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:07,792 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:27:07,859 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:07,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501334336] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:07,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:07,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:07,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487718923] [2021-05-22 02:27:07,860 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:07,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:07,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:07,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:07,860 INFO L87 Difference]: Start difference. First operand 471 states and 1471 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:08,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:08,202 INFO L93 Difference]: Finished difference Result 683 states and 2097 transitions. [2021-05-22 02:27:08,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:27:08,202 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:08,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:08,203 INFO L225 Difference]: With dead ends: 683 [2021-05-22 02:27:08,203 INFO L226 Difference]: Without dead ends: 660 [2021-05-22 02:27:08,203 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 289.7ms TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:27:08,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-22 02:27:08,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 470. [2021-05-22 02:27:08,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.138592750533049) internal successors, (1472), 469 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:08,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1472 transitions. [2021-05-22 02:27:08,208 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1472 transitions. Word has length 21 [2021-05-22 02:27:08,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:08,208 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1472 transitions. [2021-05-22 02:27:08,208 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:08,208 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1472 transitions. [2021-05-22 02:27:08,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:08,209 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:08,209 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:08,409 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 482 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2438 [2021-05-22 02:27:08,409 INFO L430 AbstractCegarLoop]: === Iteration 494 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:08,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:08,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1938274193, now seen corresponding path program 482 times [2021-05-22 02:27:08,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:08,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833686352] [2021-05-22 02:27:08,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:08,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:08,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:08,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:08,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833686352] [2021-05-22 02:27:08,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833686352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:08,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624762940] [2021-05-22 02:27:08,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 483 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 483 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:08,528 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:08,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:08,528 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:08,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:08,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:08,571 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:08,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:08,574 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:08,582 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:08,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:08,583 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:08,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:08,609 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:08,619 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:08,619 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:08,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:08,622 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:08,630 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:08,631 INFO L518 ElimStorePlain]: Eliminatee v_prenex_104 vanished before elimination [2021-05-22 02:27:08,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:08,631 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:27:08,703 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:08,703 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624762940] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:08,703 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:08,703 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:08,703 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295062725] [2021-05-22 02:27:08,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:08,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:08,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:08,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:08,704 INFO L87 Difference]: Start difference. First operand 470 states and 1472 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:09,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:09,241 INFO L93 Difference]: Finished difference Result 800 states and 2432 transitions. [2021-05-22 02:27:09,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:27:09,242 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:09,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:09,243 INFO L225 Difference]: With dead ends: 800 [2021-05-22 02:27:09,243 INFO L226 Difference]: Without dead ends: 773 [2021-05-22 02:27:09,243 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 447.4ms TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:27:09,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 773 states. [2021-05-22 02:27:09,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 773 to 473. [2021-05-22 02:27:09,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1483050847457625) internal successors, (1486), 472 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:09,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1486 transitions. [2021-05-22 02:27:09,251 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1486 transitions. Word has length 21 [2021-05-22 02:27:09,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:09,251 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1486 transitions. [2021-05-22 02:27:09,251 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:09,251 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1486 transitions. [2021-05-22 02:27:09,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:09,251 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:09,251 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:09,451 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2444,483 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:09,452 INFO L430 AbstractCegarLoop]: === Iteration 495 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:09,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:09,452 INFO L82 PathProgramCache]: Analyzing trace with hash 137415597, now seen corresponding path program 483 times [2021-05-22 02:27:09,452 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:09,452 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [869529250] [2021-05-22 02:27:09,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:09,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:09,545 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:09,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:09,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [869529250] [2021-05-22 02:27:09,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [869529250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:09,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1785641337] [2021-05-22 02:27:09,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 484 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 484 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:09,569 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:09,569 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:09,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:09,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:09,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:09,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:09,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:09,607 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:09,615 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:09,616 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:09,616 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:09,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:09,651 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:09,654 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:09,654 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:09,654 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:09,654 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:09,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:09,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1785641337] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:09,696 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:09,696 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:09,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874707346] [2021-05-22 02:27:09,697 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:09,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:09,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:09,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:09,697 INFO L87 Difference]: Start difference. First operand 473 states and 1486 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:10,012 INFO L93 Difference]: Finished difference Result 696 states and 2131 transitions. [2021-05-22 02:27:10,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:27:10,013 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:10,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:10,014 INFO L225 Difference]: With dead ends: 696 [2021-05-22 02:27:10,014 INFO L226 Difference]: Without dead ends: 675 [2021-05-22 02:27:10,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 308.8ms TimeCoverageRelationStatistics Valid=111, Invalid=395, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:27:10,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-05-22 02:27:10,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 469. [2021-05-22 02:27:10,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.138888888888889) internal successors, (1469), 468 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1469 transitions. [2021-05-22 02:27:10,019 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1469 transitions. Word has length 21 [2021-05-22 02:27:10,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:10,019 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1469 transitions. [2021-05-22 02:27:10,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,019 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1469 transitions. [2021-05-22 02:27:10,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:10,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:10,019 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:10,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 484 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2455 [2021-05-22 02:27:10,220 INFO L430 AbstractCegarLoop]: === Iteration 496 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:10,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:10,220 INFO L82 PathProgramCache]: Analyzing trace with hash -254032975, now seen corresponding path program 484 times [2021-05-22 02:27:10,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:10,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1418915834] [2021-05-22 02:27:10,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:10,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:10,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:10,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:10,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1418915834] [2021-05-22 02:27:10,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1418915834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:10,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108916709] [2021-05-22 02:27:10,308 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 485 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 485 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:10,332 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:10,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:10,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:10,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:10,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:10,363 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:10,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,368 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:27:10,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:27:10,389 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:27:10,391 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,399 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:10,400 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:10,400 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:10,400 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:27:10,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:10,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108916709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:10,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:10,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:10,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353030491] [2021-05-22 02:27:10,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:10,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:10,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:10,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:10,433 INFO L87 Difference]: Start difference. First operand 469 states and 1469 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:10,547 INFO L93 Difference]: Finished difference Result 587 states and 1812 transitions. [2021-05-22 02:27:10,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:10,547 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:10,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:10,548 INFO L225 Difference]: With dead ends: 587 [2021-05-22 02:27:10,548 INFO L226 Difference]: Without dead ends: 551 [2021-05-22 02:27:10,548 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 113.3ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:10,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-05-22 02:27:10,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 470. [2021-05-22 02:27:10,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.142857142857143) internal successors, (1474), 469 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1474 transitions. [2021-05-22 02:27:10,553 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1474 transitions. Word has length 21 [2021-05-22 02:27:10,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:10,553 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1474 transitions. [2021-05-22 02:27:10,553 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:10,553 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1474 transitions. [2021-05-22 02:27:10,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:10,554 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:10,554 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:10,754 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2458,485 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:10,754 INFO L430 AbstractCegarLoop]: === Iteration 497 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:10,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:10,755 INFO L82 PathProgramCache]: Analyzing trace with hash 43233435, now seen corresponding path program 485 times [2021-05-22 02:27:10,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:10,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1838314505] [2021-05-22 02:27:10,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:10,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:10,838 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:10,839 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:10,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1838314505] [2021-05-22 02:27:10,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1838314505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:10,839 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880532199] [2021-05-22 02:27:10,839 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 486 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 486 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:10,863 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:27:10,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:10,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:10,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:10,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:10,899 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:10,901 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:10,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:10,910 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:10,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:10,937 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:10,939 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,968 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:10,968 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:10,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:10,971 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:10,973 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:10,999 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:10,999 INFO L518 ElimStorePlain]: Eliminatee v_prenex_106 vanished before elimination [2021-05-22 02:27:11,000 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:27:11,000 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:105, output treesize:57 [2021-05-22 02:27:11,108 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:11,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1880532199] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:11,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:11,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:11,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175955816] [2021-05-22 02:27:11,109 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:11,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:11,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:11,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:11,109 INFO L87 Difference]: Start difference. First operand 470 states and 1474 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:11,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:11,825 INFO L93 Difference]: Finished difference Result 763 states and 2352 transitions. [2021-05-22 02:27:11,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:27:11,825 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:11,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:11,826 INFO L225 Difference]: With dead ends: 763 [2021-05-22 02:27:11,826 INFO L226 Difference]: Without dead ends: 721 [2021-05-22 02:27:11,827 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 634.8ms TimeCoverageRelationStatistics Valid=137, Invalid=565, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:27:11,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2021-05-22 02:27:11,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 485. [2021-05-22 02:27:11,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.159090909090909) internal successors, (1529), 484 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:11,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1529 transitions. [2021-05-22 02:27:11,832 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1529 transitions. Word has length 21 [2021-05-22 02:27:11,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:11,832 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1529 transitions. [2021-05-22 02:27:11,832 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:11,832 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1529 transitions. [2021-05-22 02:27:11,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:11,833 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:11,833 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:12,033 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2461,486 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:12,033 INFO L430 AbstractCegarLoop]: === Iteration 498 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:12,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:12,034 INFO L82 PathProgramCache]: Analyzing trace with hash -241029249, now seen corresponding path program 486 times [2021-05-22 02:27:12,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:12,034 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643788941] [2021-05-22 02:27:12,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:12,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:12,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:12,123 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:12,123 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643788941] [2021-05-22 02:27:12,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643788941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:12,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698725580] [2021-05-22 02:27:12,124 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 487 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 487 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:12,148 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:27:12,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:12,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:12,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:12,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:12,183 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:12,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:12,185 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:12,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:12,194 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:12,194 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:12,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:12,220 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:12,230 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:12,230 INFO L518 ElimStorePlain]: Eliminatee v_prenex_108 vanished before elimination [2021-05-22 02:27:12,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:12,232 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:12,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:12,241 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:12,241 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:12,241 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:27:12,311 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:12,312 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698725580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:12,312 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:12,312 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:12,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [962833867] [2021-05-22 02:27:12,312 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:12,312 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:12,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:12,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:12,312 INFO L87 Difference]: Start difference. First operand 485 states and 1529 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:12,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:12,767 INFO L93 Difference]: Finished difference Result 721 states and 2216 transitions. [2021-05-22 02:27:12,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:12,767 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:12,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:12,768 INFO L225 Difference]: With dead ends: 721 [2021-05-22 02:27:12,768 INFO L226 Difference]: Without dead ends: 694 [2021-05-22 02:27:12,768 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 356.7ms TimeCoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:27:12,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2021-05-22 02:27:12,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 491. [2021-05-22 02:27:12,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.157142857142857) internal successors, (1547), 490 states have internal predecessors, (1547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:12,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1547 transitions. [2021-05-22 02:27:12,775 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1547 transitions. Word has length 21 [2021-05-22 02:27:12,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:12,775 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1547 transitions. [2021-05-22 02:27:12,775 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:12,775 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1547 transitions. [2021-05-22 02:27:12,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:12,776 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:12,776 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:12,976 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2470,487 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:12,976 INFO L430 AbstractCegarLoop]: === Iteration 499 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:12,976 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:12,976 INFO L82 PathProgramCache]: Analyzing trace with hash 2093191081, now seen corresponding path program 487 times [2021-05-22 02:27:12,976 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:12,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1120015379] [2021-05-22 02:27:12,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:12,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:13,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:13,050 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:13,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1120015379] [2021-05-22 02:27:13,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1120015379] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:13,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24234332] [2021-05-22 02:27:13,050 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 488 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 488 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:13,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:13,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:13,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:13,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:13,116 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:13,118 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:13,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:13,127 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:13,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:13,160 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,163 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:13,163 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:13,164 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,164 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:13,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:13,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24234332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:13,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:13,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:13,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [173827600] [2021-05-22 02:27:13,179 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:13,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:13,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:13,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:13,180 INFO L87 Difference]: Start difference. First operand 491 states and 1547 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:13,330 INFO L93 Difference]: Finished difference Result 593 states and 1830 transitions. [2021-05-22 02:27:13,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:13,330 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:13,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:13,331 INFO L225 Difference]: With dead ends: 593 [2021-05-22 02:27:13,331 INFO L226 Difference]: Without dead ends: 574 [2021-05-22 02:27:13,331 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 108.2ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:13,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-22 02:27:13,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 475. [2021-05-22 02:27:13,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.149789029535865) internal successors, (1493), 474 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1493 transitions. [2021-05-22 02:27:13,336 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1493 transitions. Word has length 21 [2021-05-22 02:27:13,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:13,336 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1493 transitions. [2021-05-22 02:27:13,336 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,336 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1493 transitions. [2021-05-22 02:27:13,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:13,336 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:13,336 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:13,537 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2481,488 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:13,537 INFO L430 AbstractCegarLoop]: === Iteration 500 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:13,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:13,537 INFO L82 PathProgramCache]: Analyzing trace with hash -1656403561, now seen corresponding path program 488 times [2021-05-22 02:27:13,537 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:13,537 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305487736] [2021-05-22 02:27:13,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:13,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:13,617 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:13,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:13,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305487736] [2021-05-22 02:27:13,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305487736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:13,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778989443] [2021-05-22 02:27:13,618 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 489 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 489 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:13,641 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:13,641 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:13,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:13,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:13,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:13,675 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:13,678 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,686 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:13,686 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:13,686 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:13,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:13,741 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,743 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:13,743 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:13,744 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:13,744 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:13,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778989443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:13,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:13,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:13,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1501897589] [2021-05-22 02:27:13,754 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:13,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:13,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:13,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:13,754 INFO L87 Difference]: Start difference. First operand 475 states and 1493 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:13,881 INFO L93 Difference]: Finished difference Result 609 states and 1868 transitions. [2021-05-22 02:27:13,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:13,881 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:13,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:13,882 INFO L225 Difference]: With dead ends: 609 [2021-05-22 02:27:13,882 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:27:13,882 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 140.5ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:13,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:27:13,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 475. [2021-05-22 02:27:13,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1582278481012658) internal successors, (1497), 474 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1497 transitions. [2021-05-22 02:27:13,887 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1497 transitions. Word has length 21 [2021-05-22 02:27:13,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:13,887 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1497 transitions. [2021-05-22 02:27:13,887 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:13,887 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1497 transitions. [2021-05-22 02:27:13,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:13,887 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:13,888 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:14,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2484,489 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:14,088 INFO L430 AbstractCegarLoop]: === Iteration 501 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:14,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:14,088 INFO L82 PathProgramCache]: Analyzing trace with hash 919579053, now seen corresponding path program 489 times [2021-05-22 02:27:14,088 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:14,088 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828495818] [2021-05-22 02:27:14,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:14,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:14,182 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:14,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:14,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828495818] [2021-05-22 02:27:14,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828495818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:14,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1168974624] [2021-05-22 02:27:14,182 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 490 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 490 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:14,208 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:27:14,208 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:14,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:14,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:14,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:14,259 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:14,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:14,262 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:14,276 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:14,277 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:27:14,277 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:27:14,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:14,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:14,324 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:14,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:14,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:14,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:14,332 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:14,337 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:14,338 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:14,338 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:27:14,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:14,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1168974624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:14,382 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:14,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:27:14,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920209381] [2021-05-22 02:27:14,382 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:14,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:14,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:14,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:14,382 INFO L87 Difference]: Start difference. First operand 475 states and 1497 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:14,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:14,623 INFO L93 Difference]: Finished difference Result 678 states and 2080 transitions. [2021-05-22 02:27:14,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:27:14,624 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:14,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:14,624 INFO L225 Difference]: With dead ends: 678 [2021-05-22 02:27:14,624 INFO L226 Difference]: Without dead ends: 657 [2021-05-22 02:27:14,625 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 261.4ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:27:14,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-05-22 02:27:14,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 471. [2021-05-22 02:27:14,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.148936170212766) internal successors, (1480), 470 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:14,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1480 transitions. [2021-05-22 02:27:14,630 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1480 transitions. Word has length 21 [2021-05-22 02:27:14,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:14,630 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1480 transitions. [2021-05-22 02:27:14,630 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:14,630 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1480 transitions. [2021-05-22 02:27:14,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:14,630 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:14,630 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:14,830 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 490 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2490 [2021-05-22 02:27:14,831 INFO L430 AbstractCegarLoop]: === Iteration 502 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:14,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:14,831 INFO L82 PathProgramCache]: Analyzing trace with hash -1979001065, now seen corresponding path program 490 times [2021-05-22 02:27:14,831 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:14,831 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478743566] [2021-05-22 02:27:14,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:14,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:14,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:14,944 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:14,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478743566] [2021-05-22 02:27:14,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478743566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:14,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443263656] [2021-05-22 02:27:14,945 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 491 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 491 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:14,976 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:14,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:14,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:14,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:15,072 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:15,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:15,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:15,079 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:15,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:27:15,080 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:27:15,130 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:15,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:15,131 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:15,137 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:15,139 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:15,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:15,140 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:15,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:15,146 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:15,146 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:35, output treesize:7 [2021-05-22 02:27:15,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:15,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443263656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:15,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:15,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:27:15,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290099110] [2021-05-22 02:27:15,176 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:15,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:15,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:15,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:15,176 INFO L87 Difference]: Start difference. First operand 471 states and 1480 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:15,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:15,611 INFO L93 Difference]: Finished difference Result 701 states and 2153 transitions. [2021-05-22 02:27:15,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:27:15,611 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:15,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:15,612 INFO L225 Difference]: With dead ends: 701 [2021-05-22 02:27:15,612 INFO L226 Difference]: Without dead ends: 680 [2021-05-22 02:27:15,612 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 431.6ms TimeCoverageRelationStatistics Valid=123, Invalid=429, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:27:15,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-05-22 02:27:15,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 477. [2021-05-22 02:27:15,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.153361344537815) internal successors, (1501), 476 states have internal predecessors, (1501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:15,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1501 transitions. [2021-05-22 02:27:15,618 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1501 transitions. Word has length 21 [2021-05-22 02:27:15,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:15,618 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1501 transitions. [2021-05-22 02:27:15,618 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:15,618 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1501 transitions. [2021-05-22 02:27:15,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:15,618 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:15,618 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:15,819 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2494,491 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:15,819 INFO L430 AbstractCegarLoop]: === Iteration 503 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:15,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:15,819 INFO L82 PathProgramCache]: Analyzing trace with hash 986038069, now seen corresponding path program 491 times [2021-05-22 02:27:15,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:15,819 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [586608236] [2021-05-22 02:27:15,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:15,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:15,896 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:15,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:15,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [586608236] [2021-05-22 02:27:15,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [586608236] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:15,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577360273] [2021-05-22 02:27:15,896 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 492 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 492 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:15,920 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:15,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:15,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:15,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:16,018 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:16,020 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,022 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:16,023 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,044 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:27:16,051 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:73, output treesize:59 [2021-05-22 02:27:16,107 INFO L446 ElimStorePlain]: Different costs {1=[o_0], 3=[o_2]} [2021-05-22 02:27:16,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,110 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:16,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,113 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:16,114 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:16,143 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,145 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:16,146 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,169 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:16,169 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 5 variables, input treesize:87, output treesize:31 [2021-05-22 02:27:16,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:16,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577360273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:16,245 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:16,245 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:27:16,245 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [554330136] [2021-05-22 02:27:16,245 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:16,245 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:16,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:16,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:16,246 INFO L87 Difference]: Start difference. First operand 477 states and 1501 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:16,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:16,520 INFO L93 Difference]: Finished difference Result 602 states and 1853 transitions. [2021-05-22 02:27:16,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:27:16,520 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:16,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:16,521 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:27:16,521 INFO L226 Difference]: Without dead ends: 581 [2021-05-22 02:27:16,521 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 323.0ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:27:16,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-22 02:27:16,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 474. [2021-05-22 02:27:16,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:16,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:27:16,526 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:27:16,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:16,526 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:27:16,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:16,526 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:27:16,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:16,527 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:16,527 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:16,727 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 492 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2497 [2021-05-22 02:27:16,728 INFO L430 AbstractCegarLoop]: === Iteration 504 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:16,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:16,728 INFO L82 PathProgramCache]: Analyzing trace with hash 70956581, now seen corresponding path program 492 times [2021-05-22 02:27:16,728 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:16,728 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895507047] [2021-05-22 02:27:16,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:16,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:16,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:16,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:16,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895507047] [2021-05-22 02:27:16,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [895507047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:16,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590773753] [2021-05-22 02:27:16,817 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 493 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 493 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:16,842 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:27:16,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:16,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:16,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:16,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:16,903 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:27:16,909 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:27:16,931 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:16,932 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,938 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,940 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:27:16,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:27:16,941 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,946 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:16,947 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:16,947 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:27:16,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:16,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1590773753] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:16,991 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:16,991 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:27:16,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178234717] [2021-05-22 02:27:16,991 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:16,991 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:16,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:16,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:16,991 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:17,267 INFO L93 Difference]: Finished difference Result 679 states and 2087 transitions. [2021-05-22 02:27:17,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:27:17,267 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:17,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:17,268 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:27:17,268 INFO L226 Difference]: Without dead ends: 658 [2021-05-22 02:27:17,268 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 267.6ms TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:27:17,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-05-22 02:27:17,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 470. [2021-05-22 02:27:17,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1471215351812365) internal successors, (1476), 469 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1476 transitions. [2021-05-22 02:27:17,273 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1476 transitions. Word has length 21 [2021-05-22 02:27:17,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:17,273 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1476 transitions. [2021-05-22 02:27:17,273 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,274 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1476 transitions. [2021-05-22 02:27:17,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:17,274 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:17,274 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:17,474 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2505,493 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:17,475 INFO L430 AbstractCegarLoop]: === Iteration 505 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:17,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:17,475 INFO L82 PathProgramCache]: Analyzing trace with hash -1460904125, now seen corresponding path program 493 times [2021-05-22 02:27:17,475 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:17,475 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417886355] [2021-05-22 02:27:17,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:17,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:17,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:17,558 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:17,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417886355] [2021-05-22 02:27:17,558 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417886355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:17,558 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959156776] [2021-05-22 02:27:17,558 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 494 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 494 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:17,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:17,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:17,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:17,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:17,600 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:17,604 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:17,604 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:17,604 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:27:17,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:27:17,626 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:17,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:27:17,628 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:17,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:17,636 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:17,637 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:17,637 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:27:17,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:17,669 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959156776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:17,669 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:17,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:27:17,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441052811] [2021-05-22 02:27:17,669 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:27:17,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:17,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:27:17,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:17,670 INFO L87 Difference]: Start difference. First operand 470 states and 1476 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:17,844 INFO L93 Difference]: Finished difference Result 710 states and 2179 transitions. [2021-05-22 02:27:17,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:17,844 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:17,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:17,845 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:27:17,845 INFO L226 Difference]: Without dead ends: 663 [2021-05-22 02:27:17,846 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 129.5ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:17,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2021-05-22 02:27:17,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 473. [2021-05-22 02:27:17,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1588983050847457) internal successors, (1491), 472 states have internal predecessors, (1491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1491 transitions. [2021-05-22 02:27:17,851 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1491 transitions. Word has length 21 [2021-05-22 02:27:17,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:17,851 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1491 transitions. [2021-05-22 02:27:17,851 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:17,851 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1491 transitions. [2021-05-22 02:27:17,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:17,851 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:17,851 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:18,052 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2507,494 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:18,052 INFO L430 AbstractCegarLoop]: === Iteration 506 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:18,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:18,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1163637715, now seen corresponding path program 494 times [2021-05-22 02:27:18,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:18,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319197887] [2021-05-22 02:27:18,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:18,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:18,127 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:18,127 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:18,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319197887] [2021-05-22 02:27:18,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319197887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:18,127 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [955137816] [2021-05-22 02:27:18,127 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 495 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 495 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:18,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:18,152 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:18,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:18,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:18,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:18,174 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:18,176 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:18,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:18,183 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:18,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:18,218 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:18,221 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,229 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:18,229 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:18,229 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:18,229 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:27:18,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:18,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [955137816] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:18,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:18,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:18,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148583748] [2021-05-22 02:27:18,279 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:18,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:18,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:18,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:18,279 INFO L87 Difference]: Start difference. First operand 473 states and 1491 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:18,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:18,518 INFO L93 Difference]: Finished difference Result 774 states and 2375 transitions. [2021-05-22 02:27:18,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:27:18,518 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:18,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:18,519 INFO L225 Difference]: With dead ends: 774 [2021-05-22 02:27:18,519 INFO L226 Difference]: Without dead ends: 751 [2021-05-22 02:27:18,519 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 215.3ms TimeCoverageRelationStatistics Valid=70, Invalid=236, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:18,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-22 02:27:18,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 498. [2021-05-22 02:27:18,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 498 states, 497 states have (on average 3.1790744466800804) internal successors, (1580), 497 states have internal predecessors, (1580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:18,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 498 states to 498 states and 1580 transitions. [2021-05-22 02:27:18,525 INFO L78 Accepts]: Start accepts. Automaton has 498 states and 1580 transitions. Word has length 21 [2021-05-22 02:27:18,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:18,525 INFO L482 AbstractCegarLoop]: Abstraction has 498 states and 1580 transitions. [2021-05-22 02:27:18,525 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:18,525 INFO L276 IsEmpty]: Start isEmpty. Operand 498 states and 1580 transitions. [2021-05-22 02:27:18,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:18,526 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:18,526 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:18,726 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 495 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2510 [2021-05-22 02:27:18,726 INFO L430 AbstractCegarLoop]: === Iteration 507 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:18,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:18,727 INFO L82 PathProgramCache]: Analyzing trace with hash -1447900399, now seen corresponding path program 495 times [2021-05-22 02:27:18,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:18,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146015207] [2021-05-22 02:27:18,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:18,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:18,809 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:18,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146015207] [2021-05-22 02:27:18,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146015207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:18,809 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489501649] [2021-05-22 02:27:18,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 496 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 496 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:18,834 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:27:18,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:18,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:18,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:18,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:18,869 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:18,872 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,879 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:18,880 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:18,880 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:18,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:18,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:18,919 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:18,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:18,927 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:18,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:18,928 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:27:19,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:19,004 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489501649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:19,004 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:19,004 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:19,004 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [446148606] [2021-05-22 02:27:19,005 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:19,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:19,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:19,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:19,005 INFO L87 Difference]: Start difference. First operand 498 states and 1580 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:19,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:19,498 INFO L93 Difference]: Finished difference Result 877 states and 2704 transitions. [2021-05-22 02:27:19,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:19,498 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:19,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:19,500 INFO L225 Difference]: With dead ends: 877 [2021-05-22 02:27:19,500 INFO L226 Difference]: Without dead ends: 850 [2021-05-22 02:27:19,500 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 398.5ms TimeCoverageRelationStatistics Valid=139, Invalid=511, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:27:19,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2021-05-22 02:27:19,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 516. [2021-05-22 02:27:19,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 515 states have (on average 3.18252427184466) internal successors, (1639), 515 states have internal predecessors, (1639), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:19,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 1639 transitions. [2021-05-22 02:27:19,506 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 1639 transitions. Word has length 21 [2021-05-22 02:27:19,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:19,506 INFO L482 AbstractCegarLoop]: Abstraction has 516 states and 1639 transitions. [2021-05-22 02:27:19,506 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:19,506 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 1639 transitions. [2021-05-22 02:27:19,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:19,507 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:19,507 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:19,707 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2517,496 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:19,707 INFO L430 AbstractCegarLoop]: === Iteration 508 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:19,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:19,707 INFO L82 PathProgramCache]: Analyzing trace with hash 886319931, now seen corresponding path program 496 times [2021-05-22 02:27:19,707 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:19,707 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616557784] [2021-05-22 02:27:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:19,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:19,778 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:19,778 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:19,778 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616557784] [2021-05-22 02:27:19,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616557784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:19,779 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [492290567] [2021-05-22 02:27:19,779 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 497 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 497 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:19,802 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:19,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:19,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:19,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:19,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:19,824 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:19,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:19,826 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:19,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:19,833 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:19,833 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:19,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:19,878 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:19,881 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:19,881 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:19,882 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:19,882 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:19,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:19,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [492290567] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:19,898 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:19,898 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:19,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967779645] [2021-05-22 02:27:19,898 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:19,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:19,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:19,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:19,899 INFO L87 Difference]: Start difference. First operand 516 states and 1639 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:20,063 INFO L93 Difference]: Finished difference Result 768 states and 2376 transitions. [2021-05-22 02:27:20,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:20,064 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:20,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:20,065 INFO L225 Difference]: With dead ends: 768 [2021-05-22 02:27:20,065 INFO L226 Difference]: Without dead ends: 749 [2021-05-22 02:27:20,065 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 121.0ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:20,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2021-05-22 02:27:20,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 514. [2021-05-22 02:27:20,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 514 states, 513 states have (on average 3.185185185185185) internal successors, (1634), 513 states have internal predecessors, (1634), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 1634 transitions. [2021-05-22 02:27:20,070 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 1634 transitions. Word has length 21 [2021-05-22 02:27:20,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:20,070 INFO L482 AbstractCegarLoop]: Abstraction has 514 states and 1634 transitions. [2021-05-22 02:27:20,070 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,071 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 1634 transitions. [2021-05-22 02:27:20,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:20,071 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:20,071 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:20,271 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 497 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2527 [2021-05-22 02:27:20,272 INFO L430 AbstractCegarLoop]: === Iteration 509 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:20,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:20,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1431692585, now seen corresponding path program 497 times [2021-05-22 02:27:20,272 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:20,272 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1487134314] [2021-05-22 02:27:20,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:20,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:20,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:20,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:20,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1487134314] [2021-05-22 02:27:20,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1487134314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:20,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [308542099] [2021-05-22 02:27:20,357 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 498 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 498 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:20,382 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:20,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:20,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:20,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:20,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:20,411 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:20,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:20,413 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:20,419 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:20,427 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:20,427 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:20,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:20,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:20,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:20,513 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:20,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:20,514 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:20,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:20,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [308542099] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:20,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:20,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:20,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805080256] [2021-05-22 02:27:20,525 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:20,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:20,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:20,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:20,525 INFO L87 Difference]: Start difference. First operand 514 states and 1634 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:20,706 INFO L93 Difference]: Finished difference Result 772 states and 2383 transitions. [2021-05-22 02:27:20,707 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:20,707 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:20,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:20,708 INFO L225 Difference]: With dead ends: 772 [2021-05-22 02:27:20,708 INFO L226 Difference]: Without dead ends: 751 [2021-05-22 02:27:20,708 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 126.0ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:20,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 751 states. [2021-05-22 02:27:20,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 751 to 506. [2021-05-22 02:27:20,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 505 states have (on average 3.1782178217821784) internal successors, (1605), 505 states have internal predecessors, (1605), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 1605 transitions. [2021-05-22 02:27:20,714 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 1605 transitions. Word has length 21 [2021-05-22 02:27:20,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:20,714 INFO L482 AbstractCegarLoop]: Abstraction has 506 states and 1605 transitions. [2021-05-22 02:27:20,714 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:20,714 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 1605 transitions. [2021-05-22 02:27:20,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:20,714 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:20,714 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:20,915 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 498 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2530 [2021-05-22 02:27:20,915 INFO L430 AbstractCegarLoop]: === Iteration 510 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:20,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:20,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1923558039, now seen corresponding path program 498 times [2021-05-22 02:27:20,915 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:20,915 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546170231] [2021-05-22 02:27:20,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:20,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:20,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:20,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:20,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546170231] [2021-05-22 02:27:20,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546170231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:20,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [864301732] [2021-05-22 02:27:20,988 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 499 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 499 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:21,012 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:27:21,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:21,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:21,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:21,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:21,034 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:21,037 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:21,043 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:21,043 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:21,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:21,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,075 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:21,075 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:21,075 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,075 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:21,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:21,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [864301732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:21,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:21,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:27:21,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640360350] [2021-05-22 02:27:21,113 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:27:21,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:21,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:27:21,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:21,113 INFO L87 Difference]: Start difference. First operand 506 states and 1605 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:21,448 INFO L93 Difference]: Finished difference Result 906 states and 2767 transitions. [2021-05-22 02:27:21,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:21,448 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:21,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:21,450 INFO L225 Difference]: With dead ends: 906 [2021-05-22 02:27:21,450 INFO L226 Difference]: Without dead ends: 887 [2021-05-22 02:27:21,450 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 242.0ms TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:27:21,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2021-05-22 02:27:21,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 484. [2021-05-22 02:27:21,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1614906832298137) internal successors, (1527), 483 states have internal predecessors, (1527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1527 transitions. [2021-05-22 02:27:21,456 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1527 transitions. Word has length 21 [2021-05-22 02:27:21,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:21,456 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1527 transitions. [2021-05-22 02:27:21,456 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,456 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1527 transitions. [2021-05-22 02:27:21,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:21,456 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:21,457 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:21,657 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 499 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2534 [2021-05-22 02:27:21,657 INFO L430 AbstractCegarLoop]: === Iteration 511 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:21,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:21,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1186061807, now seen corresponding path program 499 times [2021-05-22 02:27:21,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:21,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155889683] [2021-05-22 02:27:21,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:21,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:21,722 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:21,723 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:21,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155889683] [2021-05-22 02:27:21,723 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155889683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:21,723 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486964456] [2021-05-22 02:27:21,723 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 500 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 500 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:21,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:21,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:21,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:21,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:21,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:21,781 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,788 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:21,788 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:21,789 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:21,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:21,810 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:21,813 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:21,813 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:21,813 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:21,822 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:21,822 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486964456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:21,822 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:21,822 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:21,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461818051] [2021-05-22 02:27:21,823 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:21,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:21,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:21,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:21,823 INFO L87 Difference]: Start difference. First operand 484 states and 1527 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:21,962 INFO L93 Difference]: Finished difference Result 847 states and 2585 transitions. [2021-05-22 02:27:21,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:21,962 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:21,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:21,963 INFO L225 Difference]: With dead ends: 847 [2021-05-22 02:27:21,963 INFO L226 Difference]: Without dead ends: 826 [2021-05-22 02:27:21,964 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 113.1ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:21,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 826 states. [2021-05-22 02:27:21,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 826 to 477. [2021-05-22 02:27:21,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1596638655462184) internal successors, (1504), 476 states have internal predecessors, (1504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1504 transitions. [2021-05-22 02:27:21,969 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1504 transitions. Word has length 21 [2021-05-22 02:27:21,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:21,969 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1504 transitions. [2021-05-22 02:27:21,969 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:21,969 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1504 transitions. [2021-05-22 02:27:21,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:21,970 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:21,970 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:22,170 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 500 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2537 [2021-05-22 02:27:22,171 INFO L430 AbstractCegarLoop]: === Iteration 512 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:22,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:22,171 INFO L82 PathProgramCache]: Analyzing trace with hash 571602225, now seen corresponding path program 500 times [2021-05-22 02:27:22,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:22,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011781989] [2021-05-22 02:27:22,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:22,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:22,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:22,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:22,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011781989] [2021-05-22 02:27:22,256 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011781989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:22,256 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [628283647] [2021-05-22 02:27:22,256 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 501 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 501 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:22,281 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:22,281 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:22,281 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:22,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:22,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:22,314 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:22,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:22,318 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:22,318 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:22,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:22,348 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:22,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:22,350 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:22,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:22,351 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:22,377 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:22,377 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [628283647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:22,378 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:22,378 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:27:22,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651767561] [2021-05-22 02:27:22,378 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:27:22,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:22,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:27:22,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:22,378 INFO L87 Difference]: Start difference. First operand 477 states and 1504 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:22,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:22,696 INFO L93 Difference]: Finished difference Result 721 states and 2218 transitions. [2021-05-22 02:27:22,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:22,696 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:22,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:22,697 INFO L225 Difference]: With dead ends: 721 [2021-05-22 02:27:22,697 INFO L226 Difference]: Without dead ends: 700 [2021-05-22 02:27:22,698 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 268.2ms TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:27:22,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-05-22 02:27:22,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 483. [2021-05-22 02:27:22,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1514522821576763) internal successors, (1519), 482 states have internal predecessors, (1519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:22,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1519 transitions. [2021-05-22 02:27:22,709 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1519 transitions. Word has length 21 [2021-05-22 02:27:22,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:22,709 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1519 transitions. [2021-05-22 02:27:22,709 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:22,709 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1519 transitions. [2021-05-22 02:27:22,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:22,709 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:22,709 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:22,910 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 501 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2541 [2021-05-22 02:27:22,910 INFO L430 AbstractCegarLoop]: === Iteration 513 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:22,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:22,910 INFO L82 PathProgramCache]: Analyzing trace with hash -758325937, now seen corresponding path program 501 times [2021-05-22 02:27:22,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:22,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2083919801] [2021-05-22 02:27:22,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:22,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:22,995 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:22,995 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:22,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2083919801] [2021-05-22 02:27:22,995 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2083919801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:22,995 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641721374] [2021-05-22 02:27:22,995 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 502 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 502 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:23,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:23,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:23,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:23,022 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:23,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:23,054 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:23,058 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,058 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:23,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:23,074 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,078 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:23,078 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:23,078 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,078 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:23,119 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:23,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641721374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:23,119 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:23,119 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:27:23,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993787915] [2021-05-22 02:27:23,119 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:27:23,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:23,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:27:23,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:23,120 INFO L87 Difference]: Start difference. First operand 483 states and 1519 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:23,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:23,455 INFO L93 Difference]: Finished difference Result 715 states and 2203 transitions. [2021-05-22 02:27:23,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:23,456 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:23,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:23,456 INFO L225 Difference]: With dead ends: 715 [2021-05-22 02:27:23,457 INFO L226 Difference]: Without dead ends: 694 [2021-05-22 02:27:23,457 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 276.6ms TimeCoverageRelationStatistics Valid=108, Invalid=354, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:27:23,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 694 states. [2021-05-22 02:27:23,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 694 to 480. [2021-05-22 02:27:23,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.1461377870563676) internal successors, (1507), 479 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:23,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1507 transitions. [2021-05-22 02:27:23,462 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1507 transitions. Word has length 21 [2021-05-22 02:27:23,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:23,462 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1507 transitions. [2021-05-22 02:27:23,462 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:23,462 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1507 transitions. [2021-05-22 02:27:23,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:23,463 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:23,463 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:23,663 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 502 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2543 [2021-05-22 02:27:23,663 INFO L430 AbstractCegarLoop]: === Iteration 514 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:23,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:23,664 INFO L82 PathProgramCache]: Analyzing trace with hash -1673407425, now seen corresponding path program 502 times [2021-05-22 02:27:23,664 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:23,664 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607263294] [2021-05-22 02:27:23,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:23,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:23,749 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:23,749 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:23,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607263294] [2021-05-22 02:27:23,749 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607263294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:23,749 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558820334] [2021-05-22 02:27:23,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 503 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 503 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:23,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:23,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:23,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:23,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:23,819 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:23,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:23,823 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,823 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:23,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:23,839 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:23,842 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:23,842 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:23,843 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:27:23,884 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:23,884 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558820334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:23,884 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:23,884 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:23,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863889967] [2021-05-22 02:27:23,884 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:23,884 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:23,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:23,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:23,885 INFO L87 Difference]: Start difference. First operand 480 states and 1507 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:24,163 INFO L93 Difference]: Finished difference Result 695 states and 2136 transitions. [2021-05-22 02:27:24,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:27:24,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:24,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:24,164 INFO L225 Difference]: With dead ends: 695 [2021-05-22 02:27:24,164 INFO L226 Difference]: Without dead ends: 674 [2021-05-22 02:27:24,164 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 240.5ms TimeCoverageRelationStatistics Valid=103, Invalid=359, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:27:24,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-22 02:27:24,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 477. [2021-05-22 02:27:24,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1470588235294117) internal successors, (1498), 476 states have internal predecessors, (1498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1498 transitions. [2021-05-22 02:27:24,169 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1498 transitions. Word has length 21 [2021-05-22 02:27:24,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:24,170 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1498 transitions. [2021-05-22 02:27:24,170 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,170 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1498 transitions. [2021-05-22 02:27:24,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:24,170 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:24,170 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:24,370 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 503 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2545 [2021-05-22 02:27:24,371 INFO L430 AbstractCegarLoop]: === Iteration 515 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:24,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:24,371 INFO L82 PathProgramCache]: Analyzing trace with hash -188318099, now seen corresponding path program 503 times [2021-05-22 02:27:24,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:24,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243674986] [2021-05-22 02:27:24,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:24,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:24,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:24,447 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:24,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243674986] [2021-05-22 02:27:24,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [243674986] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:24,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547136000] [2021-05-22 02:27:24,447 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 504 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 504 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:24,472 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:27:24,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:24,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:24,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:24,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:24,506 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:24,509 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:24,509 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:24,509 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:27:24,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:24,527 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:24,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:24,529 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:24,543 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:24,543 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:24,544 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:24,544 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:27:24,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:24,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [547136000] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:24,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:24,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:27:24,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977442020] [2021-05-22 02:27:24,615 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:27:24,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:24,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:27:24,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:24,615 INFO L87 Difference]: Start difference. First operand 477 states and 1498 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:24,850 INFO L93 Difference]: Finished difference Result 720 states and 2178 transitions. [2021-05-22 02:27:24,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:27:24,850 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:24,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:24,851 INFO L225 Difference]: With dead ends: 720 [2021-05-22 02:27:24,852 INFO L226 Difference]: Without dead ends: 699 [2021-05-22 02:27:24,852 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 222.7ms TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:24,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2021-05-22 02:27:24,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 450. [2021-05-22 02:27:24,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.1224944320712695) internal successors, (1402), 449 states have internal predecessors, (1402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1402 transitions. [2021-05-22 02:27:24,857 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1402 transitions. Word has length 21 [2021-05-22 02:27:24,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:24,857 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1402 transitions. [2021-05-22 02:27:24,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:24,857 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1402 transitions. [2021-05-22 02:27:24,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:24,857 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:24,857 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:25,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2547,504 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:25,058 INFO L430 AbstractCegarLoop]: === Iteration 516 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:25,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:25,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1659004613, now seen corresponding path program 504 times [2021-05-22 02:27:25,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:25,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538382990] [2021-05-22 02:27:25,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:25,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:25,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:25,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:25,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538382990] [2021-05-22 02:27:25,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538382990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:25,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476873525] [2021-05-22 02:27:25,119 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 505 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 505 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:25,144 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:25,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:25,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:25,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:25,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:25,164 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,166 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:25,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,167 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:27:25,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:25,186 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,189 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:25,189 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:25,189 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,189 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:25,197 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:25,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476873525] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:25,197 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:25,197 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:25,197 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16682152] [2021-05-22 02:27:25,197 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:25,197 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:25,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:25,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:25,198 INFO L87 Difference]: Start difference. First operand 450 states and 1402 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:25,351 INFO L93 Difference]: Finished difference Result 714 states and 2155 transitions. [2021-05-22 02:27:25,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:25,352 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:25,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:25,353 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:27:25,353 INFO L226 Difference]: Without dead ends: 692 [2021-05-22 02:27:25,353 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 86.2ms TimeCoverageRelationStatistics Valid=52, Invalid=158, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:25,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-05-22 02:27:25,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 453. [2021-05-22 02:27:25,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1216814159292037) internal successors, (1411), 452 states have internal predecessors, (1411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1411 transitions. [2021-05-22 02:27:25,358 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1411 transitions. Word has length 21 [2021-05-22 02:27:25,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:25,358 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1411 transitions. [2021-05-22 02:27:25,358 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,358 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1411 transitions. [2021-05-22 02:27:25,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:25,359 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:25,359 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:25,559 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 505 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2552 [2021-05-22 02:27:25,559 INFO L430 AbstractCegarLoop]: === Iteration 517 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:25,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:25,559 INFO L82 PathProgramCache]: Analyzing trace with hash -283695579, now seen corresponding path program 505 times [2021-05-22 02:27:25,559 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:25,559 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500342092] [2021-05-22 02:27:25,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:25,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:25,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:25,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:25,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500342092] [2021-05-22 02:27:25,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500342092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:25,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [76048420] [2021-05-22 02:27:25,614 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 506 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 506 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:25,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:25,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:25,639 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:25,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:25,663 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,666 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:25,667 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,667 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:25,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:25,698 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,701 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:25,701 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:25,701 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:25,701 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:25,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:25,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [76048420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:25,709 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:25,709 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:27:25,709 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511696475] [2021-05-22 02:27:25,710 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:27:25,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:25,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:27:25,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:25,710 INFO L87 Difference]: Start difference. First operand 453 states and 1411 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:25,831 INFO L93 Difference]: Finished difference Result 651 states and 1975 transitions. [2021-05-22 02:27:25,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:25,832 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:25,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:25,833 INFO L225 Difference]: With dead ends: 651 [2021-05-22 02:27:25,833 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:27:25,833 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 84.8ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:25,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:27:25,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 459. [2021-05-22 02:27:25,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.126637554585153) internal successors, (1432), 458 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1432 transitions. [2021-05-22 02:27:25,838 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1432 transitions. Word has length 21 [2021-05-22 02:27:25,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:25,838 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1432 transitions. [2021-05-22 02:27:25,838 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:25,838 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1432 transitions. [2021-05-22 02:27:25,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:25,838 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:25,838 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:26,039 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 506 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2554 [2021-05-22 02:27:26,039 INFO L430 AbstractCegarLoop]: === Iteration 518 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:26,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:26,039 INFO L82 PathProgramCache]: Analyzing trace with hash -785486915, now seen corresponding path program 506 times [2021-05-22 02:27:26,039 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:26,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [636305859] [2021-05-22 02:27:26,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:26,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:26,093 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:26,093 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:26,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [636305859] [2021-05-22 02:27:26,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [636305859] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:26,093 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395056530] [2021-05-22 02:27:26,093 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 507 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 507 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:26,118 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:26,118 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:26,119 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:26,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:26,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:26,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,147 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:26,147 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,147 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:26,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:26,162 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,165 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:26,165 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:26,166 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,166 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:26,195 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:26,195 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395056530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:26,195 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:26,195 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:26,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139836905] [2021-05-22 02:27:26,196 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:26,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:26,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:26,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:26,196 INFO L87 Difference]: Start difference. First operand 459 states and 1432 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:26,365 INFO L93 Difference]: Finished difference Result 660 states and 1999 transitions. [2021-05-22 02:27:26,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:26,365 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:26,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:26,366 INFO L225 Difference]: With dead ends: 660 [2021-05-22 02:27:26,366 INFO L226 Difference]: Without dead ends: 638 [2021-05-22 02:27:26,366 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 93.0ms TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:26,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-05-22 02:27:26,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 456. [2021-05-22 02:27:26,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.120879120879121) internal successors, (1420), 455 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1420 transitions. [2021-05-22 02:27:26,371 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1420 transitions. Word has length 21 [2021-05-22 02:27:26,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:26,371 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1420 transitions. [2021-05-22 02:27:26,371 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,371 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1420 transitions. [2021-05-22 02:27:26,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:26,372 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:26,372 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:26,572 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2559,507 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:26,572 INFO L430 AbstractCegarLoop]: === Iteration 519 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:26,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:26,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1402696261, now seen corresponding path program 507 times [2021-05-22 02:27:26,572 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:26,572 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390162624] [2021-05-22 02:27:26,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:26,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:26,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:26,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:26,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390162624] [2021-05-22 02:27:26,627 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390162624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:26,627 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274641761] [2021-05-22 02:27:26,627 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 508 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 508 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:26,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:26,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:26,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:26,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:26,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:26,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,680 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:26,681 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,681 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:26,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:26,696 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:26,699 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:26,699 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:26,699 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:26,740 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:26,740 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274641761] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:26,740 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:26,740 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:26,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404804433] [2021-05-22 02:27:26,740 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:26,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:26,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:26,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:26,741 INFO L87 Difference]: Start difference. First operand 456 states and 1420 transitions. Second operand has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:26,886 INFO L93 Difference]: Finished difference Result 648 states and 1966 transitions. [2021-05-22 02:27:26,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:26,886 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:26,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:26,887 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:27:26,887 INFO L226 Difference]: Without dead ends: 626 [2021-05-22 02:27:26,887 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 104.0ms TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:26,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-05-22 02:27:26,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 450. [2021-05-22 02:27:26,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.1224944320712695) internal successors, (1402), 449 states have internal predecessors, (1402), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1402 transitions. [2021-05-22 02:27:26,893 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1402 transitions. Word has length 21 [2021-05-22 02:27:26,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:26,893 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1402 transitions. [2021-05-22 02:27:26,893 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.2142857142857144) internal successors, (31), 14 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:26,893 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1402 transitions. [2021-05-22 02:27:26,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:26,893 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:26,893 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:27,093 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2561,508 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:27,094 INFO L430 AbstractCegarLoop]: === Iteration 520 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:27,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:27,094 INFO L82 PathProgramCache]: Analyzing trace with hash -1973638483, now seen corresponding path program 508 times [2021-05-22 02:27:27,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:27,094 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528053399] [2021-05-22 02:27:27,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:27,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:27,149 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:27,149 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:27,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528053399] [2021-05-22 02:27:27,149 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528053399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:27,149 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [668198440] [2021-05-22 02:27:27,149 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 509 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 509 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:27,174 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:27,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:27,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:27,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:27,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:27,199 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,202 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:27,203 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,203 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:27,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:27,217 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:27,219 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:27,220 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,220 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:27,228 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:27,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [668198440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:27,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:27,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:27:27,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333786207] [2021-05-22 02:27:27,228 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:27:27,228 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:27,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:27:27,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:27:27,228 INFO L87 Difference]: Start difference. First operand 450 states and 1402 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:27,344 INFO L93 Difference]: Finished difference Result 669 states and 2029 transitions. [2021-05-22 02:27:27,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:27,345 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:27,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:27,345 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:27:27,345 INFO L226 Difference]: Without dead ends: 647 [2021-05-22 02:27:27,346 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 67.6ms TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:27,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 647 states. [2021-05-22 02:27:27,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 647 to 459. [2021-05-22 02:27:27,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.126637554585153) internal successors, (1432), 458 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1432 transitions. [2021-05-22 02:27:27,351 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1432 transitions. Word has length 21 [2021-05-22 02:27:27,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:27,351 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1432 transitions. [2021-05-22 02:27:27,351 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,351 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1432 transitions. [2021-05-22 02:27:27,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:27,351 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:27,351 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:27,552 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 509 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2563 [2021-05-22 02:27:27,552 INFO L430 AbstractCegarLoop]: === Iteration 521 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:27,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:27,552 INFO L82 PathProgramCache]: Analyzing trace with hash 1819537477, now seen corresponding path program 509 times [2021-05-22 02:27:27,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:27,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1389015583] [2021-05-22 02:27:27,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:27,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:27,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:27,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:27,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1389015583] [2021-05-22 02:27:27,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1389015583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:27,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525366005] [2021-05-22 02:27:27,609 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 510 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 510 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:27,634 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:27,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:27,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:27,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:27,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:27,680 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,685 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:27,686 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,686 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:27,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:27,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:27,697 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:27,697 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:27,697 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:27,713 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:27,713 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525366005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:27,713 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:27,713 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:27:27,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726600165] [2021-05-22 02:27:27,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:27:27,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:27,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:27:27,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:27:27,714 INFO L87 Difference]: Start difference. First operand 459 states and 1432 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:27,847 INFO L93 Difference]: Finished difference Result 678 states and 2053 transitions. [2021-05-22 02:27:27,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:27,847 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:27,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:27,848 INFO L225 Difference]: With dead ends: 678 [2021-05-22 02:27:27,848 INFO L226 Difference]: Without dead ends: 656 [2021-05-22 02:27:27,848 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 69.3ms TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:27,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-05-22 02:27:27,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 456. [2021-05-22 02:27:27,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.120879120879121) internal successors, (1420), 455 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1420 transitions. [2021-05-22 02:27:27,853 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1420 transitions. Word has length 21 [2021-05-22 02:27:27,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:27,853 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1420 transitions. [2021-05-22 02:27:27,853 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:27,853 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1420 transitions. [2021-05-22 02:27:27,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:27,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:27,854 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:28,054 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 510 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2568 [2021-05-22 02:27:28,054 INFO L430 AbstractCegarLoop]: === Iteration 522 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:28,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:28,054 INFO L82 PathProgramCache]: Analyzing trace with hash -287246643, now seen corresponding path program 510 times [2021-05-22 02:27:28,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:28,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537297632] [2021-05-22 02:27:28,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:28,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:28,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:28,118 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:28,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537297632] [2021-05-22 02:27:28,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537297632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:28,118 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [945004512] [2021-05-22 02:27:28,118 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 511 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 511 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:28,153 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:27:28,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:28,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:28,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:28,177 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:28,178 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:28,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,182 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:28,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:28,197 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,200 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:28,200 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:28,201 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,201 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:28,214 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:28,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [945004512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:28,214 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:28,214 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:28,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070987675] [2021-05-22 02:27:28,214 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:28,214 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:28,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:28,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:28,214 INFO L87 Difference]: Start difference. First operand 456 states and 1420 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:28,333 INFO L93 Difference]: Finished difference Result 666 states and 2020 transitions. [2021-05-22 02:27:28,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:28,333 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:28,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:28,334 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:27:28,334 INFO L226 Difference]: Without dead ends: 644 [2021-05-22 02:27:28,334 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 83.9ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:28,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-22 02:27:28,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 453. [2021-05-22 02:27:28,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1216814159292037) internal successors, (1411), 452 states have internal predecessors, (1411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1411 transitions. [2021-05-22 02:27:28,339 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1411 transitions. Word has length 21 [2021-05-22 02:27:28,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:28,339 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1411 transitions. [2021-05-22 02:27:28,339 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,339 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1411 transitions. [2021-05-22 02:27:28,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:28,340 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:28,340 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:28,540 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2570,511 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:28,540 INFO L430 AbstractCegarLoop]: === Iteration 523 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:28,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:28,540 INFO L82 PathProgramCache]: Analyzing trace with hash 752989155, now seen corresponding path program 511 times [2021-05-22 02:27:28,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:28,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1355828071] [2021-05-22 02:27:28,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:28,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:28,602 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:28,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:28,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1355828071] [2021-05-22 02:27:28,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1355828071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:28,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358719742] [2021-05-22 02:27:28,602 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 512 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 512 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:28,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:28,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:28,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:28,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:28,646 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,648 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:28,649 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,649 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:27:28,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:28,665 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,668 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:28,668 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:28,669 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:28,669 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:28,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:28,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358719742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:28,682 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:28,682 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:28,682 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762789950] [2021-05-22 02:27:28,682 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:28,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:28,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:28,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:28,682 INFO L87 Difference]: Start difference. First operand 453 states and 1411 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:28,812 INFO L93 Difference]: Finished difference Result 744 states and 2248 transitions. [2021-05-22 02:27:28,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:28,812 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:28,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:28,813 INFO L225 Difference]: With dead ends: 744 [2021-05-22 02:27:28,813 INFO L226 Difference]: Without dead ends: 722 [2021-05-22 02:27:28,813 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 84.3ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:28,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-05-22 02:27:28,817 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 452. [2021-05-22 02:27:28,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.1330376940133036) internal successors, (1413), 451 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,818 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1413 transitions. [2021-05-22 02:27:28,818 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1413 transitions. Word has length 21 [2021-05-22 02:27:28,818 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:28,818 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1413 transitions. [2021-05-22 02:27:28,818 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:28,818 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1413 transitions. [2021-05-22 02:27:28,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:28,819 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:28,819 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:29,019 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2572,512 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:29,019 INFO L430 AbstractCegarLoop]: === Iteration 524 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:29,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:29,020 INFO L82 PathProgramCache]: Analyzing trace with hash -666170479, now seen corresponding path program 512 times [2021-05-22 02:27:29,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:29,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210933374] [2021-05-22 02:27:29,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:29,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:29,085 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:29,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:29,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210933374] [2021-05-22 02:27:29,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210933374] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:29,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455546523] [2021-05-22 02:27:29,086 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 513 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 513 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:29,110 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:29,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:29,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:29,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:29,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:29,156 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:29,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:29,158 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:29,160 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:29,161 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:29,161 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:29,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:29,206 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:29,209 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:29,209 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:29,210 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:29,210 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:29,243 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:29,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455546523] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:29,243 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:29,243 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:29,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873710002] [2021-05-22 02:27:29,243 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:29,244 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:29,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:29,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:29,244 INFO L87 Difference]: Start difference. First operand 452 states and 1413 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:29,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:29,706 INFO L93 Difference]: Finished difference Result 951 states and 2864 transitions. [2021-05-22 02:27:29,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:29,707 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:29,707 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:29,708 INFO L225 Difference]: With dead ends: 951 [2021-05-22 02:27:29,708 INFO L226 Difference]: Without dead ends: 932 [2021-05-22 02:27:29,708 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 380.6ms TimeCoverageRelationStatistics Valid=200, Invalid=792, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:29,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 932 states. [2021-05-22 02:27:29,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 932 to 459. [2021-05-22 02:27:29,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.1331877729257642) internal successors, (1435), 458 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:29,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1435 transitions. [2021-05-22 02:27:29,714 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1435 transitions. Word has length 21 [2021-05-22 02:27:29,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:29,714 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1435 transitions. [2021-05-22 02:27:29,714 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:29,714 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1435 transitions. [2021-05-22 02:27:29,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:29,715 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:29,715 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:29,915 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 513 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2574 [2021-05-22 02:27:29,915 INFO L430 AbstractCegarLoop]: === Iteration 525 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:29,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:29,915 INFO L82 PathProgramCache]: Analyzing trace with hash 290594643, now seen corresponding path program 513 times [2021-05-22 02:27:29,916 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:29,916 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234280086] [2021-05-22 02:27:29,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:29,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:29,978 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:29,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:29,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234280086] [2021-05-22 02:27:29,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234280086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:29,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918167983] [2021-05-22 02:27:29,979 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 514 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 514 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:30,003 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:27:30,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:30,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:30,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:30,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:30,028 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,031 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:30,037 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,037 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:27:30,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:30,080 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:30,083 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,085 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:30,085 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:30,085 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:30,085 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:27:30,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:30,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918167983] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:30,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:30,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:27:30,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080723682] [2021-05-22 02:27:30,113 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:27:30,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:30,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:27:30,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:30,113 INFO L87 Difference]: Start difference. First operand 459 states and 1435 transitions. Second operand has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:30,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:30,377 INFO L93 Difference]: Finished difference Result 951 states and 2867 transitions. [2021-05-22 02:27:30,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:27:30,378 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:30,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:30,379 INFO L225 Difference]: With dead ends: 951 [2021-05-22 02:27:30,379 INFO L226 Difference]: Without dead ends: 912 [2021-05-22 02:27:30,379 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 184.0ms TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:27:30,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 912 states. [2021-05-22 02:27:30,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 912 to 466. [2021-05-22 02:27:30,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1376344086021506) internal successors, (1459), 465 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:30,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1459 transitions. [2021-05-22 02:27:30,385 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1459 transitions. Word has length 21 [2021-05-22 02:27:30,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:30,385 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1459 transitions. [2021-05-22 02:27:30,385 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0) internal successors, (34), 17 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:30,385 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1459 transitions. [2021-05-22 02:27:30,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:30,385 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:30,385 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:30,586 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2577,514 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:30,586 INFO L430 AbstractCegarLoop]: === Iteration 526 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:30,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:30,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1686096625, now seen corresponding path program 514 times [2021-05-22 02:27:30,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:30,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714835053] [2021-05-22 02:27:30,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:30,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:30,656 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:30,656 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:30,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714835053] [2021-05-22 02:27:30,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714835053] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:30,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [506647057] [2021-05-22 02:27:30,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 515 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 515 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:30,681 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:30,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:30,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:30,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:30,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:30,727 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:30,729 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:30,732 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:30,732 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:30,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:30,776 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,779 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:30,779 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:30,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:30,779 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:30,806 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:30,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [506647057] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:30,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:30,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:30,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212420266] [2021-05-22 02:27:30,807 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:30,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:30,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:30,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:30,807 INFO L87 Difference]: Start difference. First operand 466 states and 1459 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:31,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:31,560 INFO L93 Difference]: Finished difference Result 1196 states and 3629 transitions. [2021-05-22 02:27:31,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:27:31,561 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:31,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:31,562 INFO L225 Difference]: With dead ends: 1196 [2021-05-22 02:27:31,562 INFO L226 Difference]: Without dead ends: 1177 [2021-05-22 02:27:31,562 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 298 ImplicationChecksByTransitivity, 641.2ms TimeCoverageRelationStatistics Valid=263, Invalid=1069, Unknown=0, NotChecked=0, Total=1332 [2021-05-22 02:27:31,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1177 states. [2021-05-22 02:27:31,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1177 to 468. [2021-05-22 02:27:31,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1349036402569594) internal successors, (1464), 467 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:31,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1464 transitions. [2021-05-22 02:27:31,569 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1464 transitions. Word has length 21 [2021-05-22 02:27:31,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:31,569 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1464 transitions. [2021-05-22 02:27:31,569 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:31,569 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1464 transitions. [2021-05-22 02:27:31,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:31,570 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:31,570 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:31,770 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2580,515 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:31,770 INFO L430 AbstractCegarLoop]: === Iteration 527 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:31,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:31,771 INFO L82 PathProgramCache]: Analyzing trace with hash -922478831, now seen corresponding path program 515 times [2021-05-22 02:27:31,771 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:31,771 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717058938] [2021-05-22 02:27:31,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:31,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:31,842 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:31,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:31,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717058938] [2021-05-22 02:27:31,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717058938] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:31,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962117528] [2021-05-22 02:27:31,842 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 516 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 516 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:31,867 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:31,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:31,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:31,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:31,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:31,913 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:31,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:31,915 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:31,918 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:31,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:31,918 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:31,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:31,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:31,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:31,950 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:31,956 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:31,956 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:31,956 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:31,957 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:32,002 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:32,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962117528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:32,003 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:32,003 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:32,003 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134190050] [2021-05-22 02:27:32,003 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:32,003 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:32,003 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:32,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:32,003 INFO L87 Difference]: Start difference. First operand 468 states and 1464 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:32,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:32,494 INFO L93 Difference]: Finished difference Result 1066 states and 3233 transitions. [2021-05-22 02:27:32,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:32,494 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:32,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:32,496 INFO L225 Difference]: With dead ends: 1066 [2021-05-22 02:27:32,496 INFO L226 Difference]: Without dead ends: 1043 [2021-05-22 02:27:32,496 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 192 ImplicationChecksByTransitivity, 367.6ms TimeCoverageRelationStatistics Valid=167, Invalid=763, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:27:32,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1043 states. [2021-05-22 02:27:32,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1043 to 480. [2021-05-22 02:27:32,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.164926931106472) internal successors, (1516), 479 states have internal predecessors, (1516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:32,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1516 transitions. [2021-05-22 02:27:32,502 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1516 transitions. Word has length 21 [2021-05-22 02:27:32,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:32,502 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1516 transitions. [2021-05-22 02:27:32,502 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:32,502 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1516 transitions. [2021-05-22 02:27:32,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:32,503 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:32,503 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:32,703 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2583,516 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:32,703 INFO L430 AbstractCegarLoop]: === Iteration 528 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:32,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:32,704 INFO L82 PathProgramCache]: Analyzing trace with hash 418639447, now seen corresponding path program 516 times [2021-05-22 02:27:32,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:32,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559967930] [2021-05-22 02:27:32,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:32,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:32,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:32,774 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:32,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559967930] [2021-05-22 02:27:32,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559967930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:32,774 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [672480087] [2021-05-22 02:27:32,774 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 517 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 517 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:32,798 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:32,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:32,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:32,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:32,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:32,856 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:32,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:32,858 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:32,872 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:32,873 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:32,873 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:32,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:32,907 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:32,910 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:32,910 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:32,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:32,910 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:32,936 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:32,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [672480087] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:32,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:32,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:32,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377069698] [2021-05-22 02:27:32,937 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:32,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:32,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:32,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:32,937 INFO L87 Difference]: Start difference. First operand 480 states and 1516 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:33,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:33,339 INFO L93 Difference]: Finished difference Result 814 states and 2490 transitions. [2021-05-22 02:27:33,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:33,340 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:33,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:33,341 INFO L225 Difference]: With dead ends: 814 [2021-05-22 02:27:33,341 INFO L226 Difference]: Without dead ends: 795 [2021-05-22 02:27:33,341 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 325.2ms TimeCoverageRelationStatistics Valid=172, Invalid=820, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:33,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 795 states. [2021-05-22 02:27:33,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 795 to 487. [2021-05-22 02:27:33,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.168724279835391) internal successors, (1540), 486 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:33,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1540 transitions. [2021-05-22 02:27:33,347 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1540 transitions. Word has length 21 [2021-05-22 02:27:33,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:33,347 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1540 transitions. [2021-05-22 02:27:33,347 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:33,347 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1540 transitions. [2021-05-22 02:27:33,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:33,348 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:33,348 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:33,548 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 517 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2587 [2021-05-22 02:27:33,549 INFO L430 AbstractCegarLoop]: === Iteration 529 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:33,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:33,549 INFO L82 PathProgramCache]: Analyzing trace with hash 196430835, now seen corresponding path program 517 times [2021-05-22 02:27:33,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:33,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36972501] [2021-05-22 02:27:33,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:33,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:33,616 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:33,616 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:33,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36972501] [2021-05-22 02:27:33,616 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [36972501] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:33,616 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [557228664] [2021-05-22 02:27:33,616 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 518 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 518 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:33,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:33,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:33,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:33,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:33,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:33,698 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:33,699 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:33,699 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:33,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:33,743 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:33,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:33,746 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:33,749 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:33,749 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:33,750 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:33,750 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:27:33,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:33,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [557228664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:33,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:33,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:33,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1877739923] [2021-05-22 02:27:33,785 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:33,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:33,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:33,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:33,786 INFO L87 Difference]: Start difference. First operand 487 states and 1540 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:34,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:34,290 INFO L93 Difference]: Finished difference Result 1028 states and 3127 transitions. [2021-05-22 02:27:34,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:27:34,290 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:34,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:34,291 INFO L225 Difference]: With dead ends: 1028 [2021-05-22 02:27:34,292 INFO L226 Difference]: Without dead ends: 968 [2021-05-22 02:27:34,292 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 286 ImplicationChecksByTransitivity, 412.4ms TimeCoverageRelationStatistics Valid=216, Invalid=974, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:27:34,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 968 states. [2021-05-22 02:27:34,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 968 to 493. [2021-05-22 02:27:34,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1686991869918697) internal successors, (1559), 492 states have internal predecessors, (1559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:34,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1559 transitions. [2021-05-22 02:27:34,298 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1559 transitions. Word has length 21 [2021-05-22 02:27:34,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:34,298 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1559 transitions. [2021-05-22 02:27:34,298 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:34,298 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1559 transitions. [2021-05-22 02:27:34,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:34,299 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:34,299 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:34,499 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2590,518 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:34,500 INFO L430 AbstractCegarLoop]: === Iteration 530 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:34,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:34,500 INFO L82 PathProgramCache]: Analyzing trace with hash 2105031287, now seen corresponding path program 518 times [2021-05-22 02:27:34,500 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:34,500 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918558825] [2021-05-22 02:27:34,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:34,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:34,574 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:34,574 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:34,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918558825] [2021-05-22 02:27:34,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918558825] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:34,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689772513] [2021-05-22 02:27:34,574 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 519 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 519 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:34,599 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:34,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:34,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:34,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:34,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:34,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:34,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:34,659 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:34,665 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:34,666 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:34,666 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:34,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:34,689 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:34,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:34,697 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:34,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:34,699 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:34,705 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:34,705 INFO L518 ElimStorePlain]: Eliminatee v_prenex_111 vanished before elimination [2021-05-22 02:27:34,705 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:34,705 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:34,750 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:34,751 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689772513] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:34,751 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:34,751 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:34,751 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770557601] [2021-05-22 02:27:34,751 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:34,751 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:34,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:34,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:34,751 INFO L87 Difference]: Start difference. First operand 493 states and 1559 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:35,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:35,223 INFO L93 Difference]: Finished difference Result 897 states and 2749 transitions. [2021-05-22 02:27:35,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:35,224 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:35,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:35,225 INFO L225 Difference]: With dead ends: 897 [2021-05-22 02:27:35,225 INFO L226 Difference]: Without dead ends: 874 [2021-05-22 02:27:35,225 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 336.7ms TimeCoverageRelationStatistics Valid=172, Invalid=820, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:35,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 874 states. [2021-05-22 02:27:35,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 874 to 487. [2021-05-22 02:27:35,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.162551440329218) internal successors, (1537), 486 states have internal predecessors, (1537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:35,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1537 transitions. [2021-05-22 02:27:35,231 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1537 transitions. Word has length 21 [2021-05-22 02:27:35,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:35,231 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1537 transitions. [2021-05-22 02:27:35,231 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:35,231 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1537 transitions. [2021-05-22 02:27:35,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:35,231 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:35,231 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:35,432 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 519 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2593 [2021-05-22 02:27:35,432 INFO L430 AbstractCegarLoop]: === Iteration 531 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:35,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:35,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1219233007, now seen corresponding path program 519 times [2021-05-22 02:27:35,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:35,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [797354521] [2021-05-22 02:27:35,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:35,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:35,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:35,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:35,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [797354521] [2021-05-22 02:27:35,495 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [797354521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:35,495 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409714288] [2021-05-22 02:27:35,495 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 520 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 520 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:35,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:35,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:35,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:35,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:35,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:35,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:35,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:35,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:35,578 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:35,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:35,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:35,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:35,605 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:35,611 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:35,611 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:35,611 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:35,611 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:27:35,656 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:35,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409714288] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:35,657 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:35,657 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 18 [2021-05-22 02:27:35,657 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555834244] [2021-05-22 02:27:35,657 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:35,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:35,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:35,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:35,657 INFO L87 Difference]: Start difference. First operand 487 states and 1537 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:36,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:36,165 INFO L93 Difference]: Finished difference Result 988 states and 3034 transitions. [2021-05-22 02:27:36,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:27:36,165 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:36,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:36,167 INFO L225 Difference]: With dead ends: 988 [2021-05-22 02:27:36,167 INFO L226 Difference]: Without dead ends: 961 [2021-05-22 02:27:36,167 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 425.2ms TimeCoverageRelationStatistics Valid=209, Invalid=847, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:27:36,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 961 states. [2021-05-22 02:27:36,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 961 to 488. [2021-05-22 02:27:36,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.166324435318275) internal successors, (1542), 487 states have internal predecessors, (1542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:36,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1542 transitions. [2021-05-22 02:27:36,173 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1542 transitions. Word has length 21 [2021-05-22 02:27:36,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:36,174 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1542 transitions. [2021-05-22 02:27:36,174 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:36,174 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1542 transitions. [2021-05-22 02:27:36,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:36,174 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:36,174 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:36,374 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 520 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2598 [2021-05-22 02:27:36,375 INFO L430 AbstractCegarLoop]: === Iteration 532 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:36,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:36,375 INFO L82 PathProgramCache]: Analyzing trace with hash 934970323, now seen corresponding path program 520 times [2021-05-22 02:27:36,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:36,375 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [510300722] [2021-05-22 02:27:36,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:36,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:36,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:36,446 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:36,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [510300722] [2021-05-22 02:27:36,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [510300722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:36,446 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687664522] [2021-05-22 02:27:36,446 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 521 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 521 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:36,470 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:36,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:36,471 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:36,471 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:36,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:36,528 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:36,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:36,530 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:36,536 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:36,536 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:36,536 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:36,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:36,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:36,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:36,567 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:36,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:36,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:36,575 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:36,575 INFO L518 ElimStorePlain]: Eliminatee v_prenex_113 vanished before elimination [2021-05-22 02:27:36,575 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:36,575 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:36,624 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:36,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687664522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:36,624 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:36,624 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:36,624 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063581129] [2021-05-22 02:27:36,624 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:36,624 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:36,624 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:36,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:36,625 INFO L87 Difference]: Start difference. First operand 488 states and 1542 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:37,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:37,230 INFO L93 Difference]: Finished difference Result 1003 states and 3062 transitions. [2021-05-22 02:27:37,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:27:37,230 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:37,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:37,232 INFO L225 Difference]: With dead ends: 1003 [2021-05-22 02:27:37,232 INFO L226 Difference]: Without dead ends: 976 [2021-05-22 02:27:37,232 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 270 ImplicationChecksByTransitivity, 538.6ms TimeCoverageRelationStatistics Valid=239, Invalid=951, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:27:37,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 976 states. [2021-05-22 02:27:37,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 976 to 505. [2021-05-22 02:27:37,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1765873015873014) internal successors, (1601), 504 states have internal predecessors, (1601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:37,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1601 transitions. [2021-05-22 02:27:37,238 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1601 transitions. Word has length 21 [2021-05-22 02:27:37,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:37,239 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1601 transitions. [2021-05-22 02:27:37,239 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:37,239 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1601 transitions. [2021-05-22 02:27:37,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:37,239 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:37,239 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:37,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 521 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2601 [2021-05-22 02:27:37,440 INFO L430 AbstractCegarLoop]: === Iteration 533 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:37,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:37,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1673605133, now seen corresponding path program 521 times [2021-05-22 02:27:37,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:37,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526680392] [2021-05-22 02:27:37,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:37,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:37,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:37,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526680392] [2021-05-22 02:27:37,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526680392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:37,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2101608210] [2021-05-22 02:27:37,513 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 522 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 522 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:37,539 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:37,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:37,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:37,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:37,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:37,598 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:37,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:37,602 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:37,608 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:37,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:37,609 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:37,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:37,640 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:37,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:37,643 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:37,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:37,643 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:37,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:37,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2101608210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:37,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:37,673 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:37,673 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927699120] [2021-05-22 02:27:37,673 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:37,673 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:37,673 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:37,673 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:37,673 INFO L87 Difference]: Start difference. First operand 505 states and 1601 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:38,074 INFO L93 Difference]: Finished difference Result 887 states and 2706 transitions. [2021-05-22 02:27:38,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:27:38,074 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:38,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:38,075 INFO L225 Difference]: With dead ends: 887 [2021-05-22 02:27:38,075 INFO L226 Difference]: Without dead ends: 866 [2021-05-22 02:27:38,075 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 361.0ms TimeCoverageRelationStatistics Valid=177, Invalid=693, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:27:38,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 866 states. [2021-05-22 02:27:38,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 866 to 484. [2021-05-22 02:27:38,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1718426501035197) internal successors, (1532), 483 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1532 transitions. [2021-05-22 02:27:38,081 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1532 transitions. Word has length 21 [2021-05-22 02:27:38,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:38,081 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1532 transitions. [2021-05-22 02:27:38,081 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,081 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1532 transitions. [2021-05-22 02:27:38,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:38,082 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:38,082 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:38,282 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2609,522 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:38,282 INFO L430 AbstractCegarLoop]: === Iteration 534 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:38,283 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:38,283 INFO L82 PathProgramCache]: Analyzing trace with hash -429983025, now seen corresponding path program 522 times [2021-05-22 02:27:38,283 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:38,283 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233340216] [2021-05-22 02:27:38,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:38,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:38,366 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:38,367 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:38,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233340216] [2021-05-22 02:27:38,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233340216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:38,367 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006318844] [2021-05-22 02:27:38,367 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 523 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 523 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:38,400 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:38,401 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:38,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:38,401 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:38,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:38,460 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:38,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:38,462 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:38,468 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:38,468 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:38,468 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:38,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:38,504 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:38,506 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:38,506 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:38,506 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:38,506 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:38,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:38,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2006318844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:38,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:38,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:38,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400808878] [2021-05-22 02:27:38,533 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:38,533 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:38,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:38,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:38,534 INFO L87 Difference]: Start difference. First operand 484 states and 1532 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:38,962 INFO L93 Difference]: Finished difference Result 910 states and 2789 transitions. [2021-05-22 02:27:38,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:27:38,962 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:38,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:38,963 INFO L225 Difference]: With dead ends: 910 [2021-05-22 02:27:38,963 INFO L226 Difference]: Without dead ends: 891 [2021-05-22 02:27:38,964 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 374.9ms TimeCoverageRelationStatistics Valid=177, Invalid=693, Unknown=0, NotChecked=0, Total=870 [2021-05-22 02:27:38,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 891 states. [2021-05-22 02:27:38,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 891 to 493. [2021-05-22 02:27:38,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1747967479674797) internal successors, (1562), 492 states have internal predecessors, (1562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1562 transitions. [2021-05-22 02:27:38,971 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1562 transitions. Word has length 21 [2021-05-22 02:27:38,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:38,971 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1562 transitions. [2021-05-22 02:27:38,971 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:38,971 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1562 transitions. [2021-05-22 02:27:38,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:38,972 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:38,972 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:39,172 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 523 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2612 [2021-05-22 02:27:39,172 INFO L430 AbstractCegarLoop]: === Iteration 535 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:39,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:39,173 INFO L82 PathProgramCache]: Analyzing trace with hash -652191637, now seen corresponding path program 523 times [2021-05-22 02:27:39,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:39,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719725973] [2021-05-22 02:27:39,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:39,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:39,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:39,245 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:39,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719725973] [2021-05-22 02:27:39,245 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719725973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:39,245 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545815734] [2021-05-22 02:27:39,245 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 524 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 524 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:39,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:39,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:39,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:39,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:39,323 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:39,327 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:39,327 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:39,327 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:39,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:39,363 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:39,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:39,365 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:39,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:39,368 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:39,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:39,368 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:27:39,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:39,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545815734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:39,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:39,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:39,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [692969377] [2021-05-22 02:27:39,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:39,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:39,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:39,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=280, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:39,395 INFO L87 Difference]: Start difference. First operand 493 states and 1562 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:39,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:39,854 INFO L93 Difference]: Finished difference Result 983 states and 2986 transitions. [2021-05-22 02:27:39,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:27:39,855 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:39,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:39,856 INFO L225 Difference]: With dead ends: 983 [2021-05-22 02:27:39,856 INFO L226 Difference]: Without dead ends: 923 [2021-05-22 02:27:39,856 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 384.2ms TimeCoverageRelationStatistics Valid=212, Invalid=978, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:27:39,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 923 states. [2021-05-22 02:27:39,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 923 to 501. [2021-05-22 02:27:39,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 500 states have (on average 3.172) internal successors, (1586), 500 states have internal predecessors, (1586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:39,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 1586 transitions. [2021-05-22 02:27:39,863 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 1586 transitions. Word has length 21 [2021-05-22 02:27:39,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:39,863 INFO L482 AbstractCegarLoop]: Abstraction has 501 states and 1586 transitions. [2021-05-22 02:27:39,863 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:39,863 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 1586 transitions. [2021-05-22 02:27:39,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:39,863 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:39,863 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:40,063 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2615,524 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:40,064 INFO L430 AbstractCegarLoop]: === Iteration 536 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:40,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:40,064 INFO L82 PathProgramCache]: Analyzing trace with hash 1256408815, now seen corresponding path program 524 times [2021-05-22 02:27:40,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:40,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856740633] [2021-05-22 02:27:40,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:40,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:40,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:40,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:40,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856740633] [2021-05-22 02:27:40,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856740633] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:40,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1700228916] [2021-05-22 02:27:40,143 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 525 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 525 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:40,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:40,169 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:40,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:40,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:40,227 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:40,228 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:40,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:40,230 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:40,236 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:40,237 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:40,237 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:40,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:40,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:40,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:40,278 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:40,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:40,281 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:40,288 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:40,289 INFO L518 ElimStorePlain]: Eliminatee v_prenex_115 vanished before elimination [2021-05-22 02:27:40,289 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:40,289 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:40,345 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:40,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1700228916] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:40,346 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:40,346 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:40,346 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643056861] [2021-05-22 02:27:40,346 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:40,346 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:40,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:40,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:40,346 INFO L87 Difference]: Start difference. First operand 501 states and 1586 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:40,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:40,939 INFO L93 Difference]: Finished difference Result 1022 states and 3138 transitions. [2021-05-22 02:27:40,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:27:40,940 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:40,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:40,941 INFO L225 Difference]: With dead ends: 1022 [2021-05-22 02:27:40,941 INFO L226 Difference]: Without dead ends: 999 [2021-05-22 02:27:40,941 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 513.7ms TimeCoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2021-05-22 02:27:40,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 999 states. [2021-05-22 02:27:40,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 999 to 498. [2021-05-22 02:27:40,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 498 states, 497 states have (on average 3.17102615694165) internal successors, (1576), 497 states have internal predecessors, (1576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:40,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 498 states to 498 states and 1576 transitions. [2021-05-22 02:27:40,948 INFO L78 Accepts]: Start accepts. Automaton has 498 states and 1576 transitions. Word has length 21 [2021-05-22 02:27:40,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:40,948 INFO L482 AbstractCegarLoop]: Abstraction has 498 states and 1576 transitions. [2021-05-22 02:27:40,948 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:40,948 INFO L276 IsEmpty]: Start isEmpty. Operand 498 states and 1576 transitions. [2021-05-22 02:27:40,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:40,949 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:40,949 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:41,149 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2618,525 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:41,149 INFO L430 AbstractCegarLoop]: === Iteration 537 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:41,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:41,149 INFO L82 PathProgramCache]: Analyzing trace with hash 370610535, now seen corresponding path program 525 times [2021-05-22 02:27:41,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:41,149 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95468272] [2021-05-22 02:27:41,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:41,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:41,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:41,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:41,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95468272] [2021-05-22 02:27:41,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95468272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:41,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581319302] [2021-05-22 02:27:41,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 526 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 526 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:41,246 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:41,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:41,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:27:41,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:41,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:41,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:41,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:27:41,338 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:41,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:41,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:41,350 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:61, output treesize:49 [2021-05-22 02:27:41,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:27:41,390 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:41,432 INFO L628 ElimStorePlain]: treesize reduction 23, result has 72.9 percent of original size [2021-05-22 02:27:41,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:27:41,435 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:41,447 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:41,448 INFO L518 ElimStorePlain]: Eliminatee v_prenex_119 vanished before elimination [2021-05-22 02:27:41,448 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:41,448 INFO L518 ElimStorePlain]: Eliminatee v_prenex_120 vanished before elimination [2021-05-22 02:27:41,448 INFO L518 ElimStorePlain]: Eliminatee v_prenex_121 vanished before elimination [2021-05-22 02:27:41,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:41,450 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:41,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:41,461 INFO L518 ElimStorePlain]: Eliminatee v_prenex_117 vanished before elimination [2021-05-22 02:27:41,461 INFO L550 ElimStorePlain]: Start of recursive call 1: 8 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:27:41,462 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 8 variables, input treesize:105, output treesize:26 [2021-05-22 02:27:41,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:41,533 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [581319302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:41,533 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:41,533 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:41,533 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914915895] [2021-05-22 02:27:41,534 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:41,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:41,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:41,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:41,534 INFO L87 Difference]: Start difference. First operand 498 states and 1576 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:42,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:42,736 INFO L93 Difference]: Finished difference Result 1189 states and 3699 transitions. [2021-05-22 02:27:42,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-22 02:27:42,736 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:42,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:42,738 INFO L225 Difference]: With dead ends: 1189 [2021-05-22 02:27:42,738 INFO L226 Difference]: Without dead ends: 1135 [2021-05-22 02:27:42,738 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1068.9ms TimeCoverageRelationStatistics Valid=346, Invalid=1816, Unknown=0, NotChecked=0, Total=2162 [2021-05-22 02:27:42,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1135 states. [2021-05-22 02:27:42,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1135 to 499. [2021-05-22 02:27:42,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 3.174698795180723) internal successors, (1581), 498 states have internal predecessors, (1581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:42,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 1581 transitions. [2021-05-22 02:27:42,745 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 1581 transitions. Word has length 21 [2021-05-22 02:27:42,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:42,745 INFO L482 AbstractCegarLoop]: Abstraction has 499 states and 1581 transitions. [2021-05-22 02:27:42,745 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:42,745 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 1581 transitions. [2021-05-22 02:27:42,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:42,745 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:42,745 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:42,946 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 526 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2623 [2021-05-22 02:27:42,946 INFO L430 AbstractCegarLoop]: === Iteration 538 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:42,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:42,946 INFO L82 PathProgramCache]: Analyzing trace with hash 86347851, now seen corresponding path program 526 times [2021-05-22 02:27:42,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:42,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1229297705] [2021-05-22 02:27:42,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:42,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:43,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:43,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:43,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1229297705] [2021-05-22 02:27:43,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1229297705] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:43,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700529889] [2021-05-22 02:27:43,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 527 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 527 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:43,039 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:43,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:43,040 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:43,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:43,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:43,096 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:43,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:43,098 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:43,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:43,104 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:43,105 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:43,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:43,128 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:43,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:43,135 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:43,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:43,137 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:43,143 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:43,143 INFO L518 ElimStorePlain]: Eliminatee v_prenex_123 vanished before elimination [2021-05-22 02:27:43,144 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:43,144 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:43,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:43,193 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700529889] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:43,193 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:43,193 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 18 [2021-05-22 02:27:43,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899802923] [2021-05-22 02:27:43,193 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:43,193 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:43,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:43,193 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:43,193 INFO L87 Difference]: Start difference. First operand 499 states and 1581 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:43,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:43,680 INFO L93 Difference]: Finished difference Result 1016 states and 3110 transitions. [2021-05-22 02:27:43,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:27:43,681 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:43,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:43,682 INFO L225 Difference]: With dead ends: 1016 [2021-05-22 02:27:43,682 INFO L226 Difference]: Without dead ends: 989 [2021-05-22 02:27:43,682 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 222 ImplicationChecksByTransitivity, 352.8ms TimeCoverageRelationStatistics Valid=184, Invalid=808, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:43,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 989 states. [2021-05-22 02:27:43,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 989 to 519. [2021-05-22 02:27:43,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 519 states, 518 states have (on average 3.189189189189189) internal successors, (1652), 518 states have internal predecessors, (1652), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:43,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 519 states to 519 states and 1652 transitions. [2021-05-22 02:27:43,689 INFO L78 Accepts]: Start accepts. Automaton has 519 states and 1652 transitions. Word has length 21 [2021-05-22 02:27:43,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:43,689 INFO L482 AbstractCegarLoop]: Abstraction has 519 states and 1652 transitions. [2021-05-22 02:27:43,689 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:43,689 INFO L276 IsEmpty]: Start isEmpty. Operand 519 states and 1652 transitions. [2021-05-22 02:27:43,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:43,689 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:43,689 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:43,890 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 527 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2631 [2021-05-22 02:27:43,890 INFO L430 AbstractCegarLoop]: === Iteration 539 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:43,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:43,890 INFO L82 PathProgramCache]: Analyzing trace with hash 1772739691, now seen corresponding path program 527 times [2021-05-22 02:27:43,890 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:43,890 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [466259596] [2021-05-22 02:27:43,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:43,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:43,961 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:43,961 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:43,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [466259596] [2021-05-22 02:27:43,961 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [466259596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:43,961 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [787294145] [2021-05-22 02:27:43,961 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 528 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 528 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:43,989 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:43,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:43,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:43,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:44,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:44,046 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:44,048 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,054 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:44,055 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:44,055 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:44,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:44,086 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,089 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:44,089 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:44,089 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,089 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:44,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:44,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [787294145] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:44,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:44,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:44,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823409966] [2021-05-22 02:27:44,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:44,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:44,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:44,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:44,125 INFO L87 Difference]: Start difference. First operand 519 states and 1652 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:44,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:44,524 INFO L93 Difference]: Finished difference Result 891 states and 2739 transitions. [2021-05-22 02:27:44,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:44,525 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:44,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:44,526 INFO L225 Difference]: With dead ends: 891 [2021-05-22 02:27:44,526 INFO L226 Difference]: Without dead ends: 864 [2021-05-22 02:27:44,526 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 327.5ms TimeCoverageRelationStatistics Valid=172, Invalid=820, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:44,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 864 states. [2021-05-22 02:27:44,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 864 to 500. [2021-05-22 02:27:44,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.1783567134268536) internal successors, (1586), 499 states have internal predecessors, (1586), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:44,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1586 transitions. [2021-05-22 02:27:44,532 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1586 transitions. Word has length 21 [2021-05-22 02:27:44,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:44,532 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1586 transitions. [2021-05-22 02:27:44,532 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:44,532 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1586 transitions. [2021-05-22 02:27:44,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:44,533 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:44,533 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:44,733 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 528 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2639 [2021-05-22 02:27:44,733 INFO L430 AbstractCegarLoop]: === Iteration 540 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:44,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:44,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1741818095, now seen corresponding path program 528 times [2021-05-22 02:27:44,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:44,734 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [95172499] [2021-05-22 02:27:44,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:44,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:44,806 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:44,806 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:44,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [95172499] [2021-05-22 02:27:44,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [95172499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:44,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472624083] [2021-05-22 02:27:44,807 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 529 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 529 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:44,831 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:27:44,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:44,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:44,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:44,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:44,873 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,876 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:44,876 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,877 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:27:44,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:27:44,910 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:44,911 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:44,917 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:44,918 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:44,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:44,918 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:27:44,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:44,965 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472624083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:44,965 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:44,965 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:44,965 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1912104715] [2021-05-22 02:27:44,965 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:44,965 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:44,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:44,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:44,966 INFO L87 Difference]: Start difference. First operand 500 states and 1586 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:45,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:45,493 INFO L93 Difference]: Finished difference Result 1071 states and 3271 transitions. [2021-05-22 02:27:45,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:45,494 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:45,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:45,495 INFO L225 Difference]: With dead ends: 1071 [2021-05-22 02:27:45,495 INFO L226 Difference]: Without dead ends: 1040 [2021-05-22 02:27:45,495 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 205 ImplicationChecksByTransitivity, 431.8ms TimeCoverageRelationStatistics Valid=193, Invalid=799, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:45,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1040 states. [2021-05-22 02:27:45,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1040 to 502. [2021-05-22 02:27:45,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.18562874251497) internal successors, (1596), 501 states have internal predecessors, (1596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:45,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1596 transitions. [2021-05-22 02:27:45,502 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1596 transitions. Word has length 21 [2021-05-22 02:27:45,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:45,502 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1596 transitions. [2021-05-22 02:27:45,502 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:45,502 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1596 transitions. [2021-05-22 02:27:45,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:45,503 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:45,503 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:45,703 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2642,529 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:45,703 INFO L430 AbstractCegarLoop]: === Iteration 541 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:45,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:45,704 INFO L82 PathProgramCache]: Analyzing trace with hash -2026080779, now seen corresponding path program 529 times [2021-05-22 02:27:45,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:45,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [578736966] [2021-05-22 02:27:45,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:45,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:45,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:45,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:45,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [578736966] [2021-05-22 02:27:45,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [578736966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:45,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528856491] [2021-05-22 02:27:45,762 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 530 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 530 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:45,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:45,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:45,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:45,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:45,830 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:45,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:45,832 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:45,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:45,835 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:45,835 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:45,863 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:45,864 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:45,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:45,866 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:45,872 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:45,872 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:45,872 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:45,872 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:27:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:45,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1528856491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:45,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:45,921 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11] total 18 [2021-05-22 02:27:45,921 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713675485] [2021-05-22 02:27:45,921 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:27:45,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:45,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:27:45,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:45,922 INFO L87 Difference]: Start difference. First operand 502 states and 1596 transitions. Second operand has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:46,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:46,417 INFO L93 Difference]: Finished difference Result 1144 states and 3503 transitions. [2021-05-22 02:27:46,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:46,417 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:46,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:46,419 INFO L225 Difference]: With dead ends: 1144 [2021-05-22 02:27:46,419 INFO L226 Difference]: Without dead ends: 1117 [2021-05-22 02:27:46,419 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 384.4ms TimeCoverageRelationStatistics Valid=181, Invalid=749, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:27:46,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1117 states. [2021-05-22 02:27:46,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1117 to 530. [2021-05-22 02:27:46,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 530 states, 529 states have (on average 3.2060491493383743) internal successors, (1696), 529 states have internal predecessors, (1696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:46,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 530 states to 530 states and 1696 transitions. [2021-05-22 02:27:46,426 INFO L78 Accepts]: Start accepts. Automaton has 530 states and 1696 transitions. Word has length 21 [2021-05-22 02:27:46,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:46,426 INFO L482 AbstractCegarLoop]: Abstraction has 530 states and 1696 transitions. [2021-05-22 02:27:46,426 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0555555555555554) internal successors, (37), 18 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:46,426 INFO L276 IsEmpty]: Start isEmpty. Operand 530 states and 1696 transitions. [2021-05-22 02:27:46,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:46,427 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:46,427 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:46,627 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2645,530 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:46,627 INFO L430 AbstractCegarLoop]: === Iteration 542 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:46,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:46,628 INFO L82 PathProgramCache]: Analyzing trace with hash -339688939, now seen corresponding path program 530 times [2021-05-22 02:27:46,628 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:46,628 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1098791777] [2021-05-22 02:27:46,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:46,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:46,698 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:46,698 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:46,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1098791777] [2021-05-22 02:27:46,698 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1098791777] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:46,698 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670485649] [2021-05-22 02:27:46,698 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 531 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 531 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:46,723 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:46,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:46,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:46,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:46,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:46,769 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:46,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:46,771 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:46,774 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:46,774 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:46,774 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:46,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:46,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:46,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:46,818 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:46,819 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:46,819 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:46,848 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:46,849 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670485649] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:46,849 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:46,849 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:46,849 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936669969] [2021-05-22 02:27:46,849 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:46,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:46,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:46,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:46,849 INFO L87 Difference]: Start difference. First operand 530 states and 1696 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:47,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:47,282 INFO L93 Difference]: Finished difference Result 1042 states and 3189 transitions. [2021-05-22 02:27:47,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:27:47,282 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:47,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:47,284 INFO L225 Difference]: With dead ends: 1042 [2021-05-22 02:27:47,284 INFO L226 Difference]: Without dead ends: 1021 [2021-05-22 02:27:47,284 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 355.2ms TimeCoverageRelationStatistics Valid=169, Invalid=761, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:27:47,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1021 states. [2021-05-22 02:27:47,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1021 to 524. [2021-05-22 02:27:47,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 524 states, 523 states have (on average 3.2007648183556405) internal successors, (1674), 523 states have internal predecessors, (1674), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:47,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 524 states to 524 states and 1674 transitions. [2021-05-22 02:27:47,290 INFO L78 Accepts]: Start accepts. Automaton has 524 states and 1674 transitions. Word has length 21 [2021-05-22 02:27:47,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:47,291 INFO L482 AbstractCegarLoop]: Abstraction has 524 states and 1674 transitions. [2021-05-22 02:27:47,291 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:47,291 INFO L276 IsEmpty]: Start isEmpty. Operand 524 states and 1674 transitions. [2021-05-22 02:27:47,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:47,291 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:47,291 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:47,491 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 531 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2652 [2021-05-22 02:27:47,492 INFO L430 AbstractCegarLoop]: === Iteration 543 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:47,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:47,492 INFO L82 PathProgramCache]: Analyzing trace with hash 700546859, now seen corresponding path program 531 times [2021-05-22 02:27:47,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:47,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694348918] [2021-05-22 02:27:47,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:47,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:47,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:47,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:47,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694348918] [2021-05-22 02:27:47,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694348918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:47,577 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254043639] [2021-05-22 02:27:47,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 532 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 532 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:47,613 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:47,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:47,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:47,615 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:47,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:47,673 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:47,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:47,676 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:47,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:47,680 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:47,680 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:27:47,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:47,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:47,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:47,736 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:47,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:47,736 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:27:47,778 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:47,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [254043639] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:47,778 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:47,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 19 [2021-05-22 02:27:47,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139964491] [2021-05-22 02:27:47,779 INFO L462 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-22 02:27:47,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:47,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-22 02:27:47,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:27:47,779 INFO L87 Difference]: Start difference. First operand 524 states and 1674 transitions. Second operand has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:48,328 INFO L93 Difference]: Finished difference Result 1084 states and 3297 transitions. [2021-05-22 02:27:48,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:27:48,328 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:48,328 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:48,329 INFO L225 Difference]: With dead ends: 1084 [2021-05-22 02:27:48,330 INFO L226 Difference]: Without dead ends: 1063 [2021-05-22 02:27:48,330 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 193 ImplicationChecksByTransitivity, 450.7ms TimeCoverageRelationStatistics Valid=200, Invalid=792, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:27:48,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1063 states. [2021-05-22 02:27:48,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1063 to 504. [2021-05-22 02:27:48,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1868787276341948) internal successors, (1603), 503 states have internal predecessors, (1603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1603 transitions. [2021-05-22 02:27:48,336 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1603 transitions. Word has length 21 [2021-05-22 02:27:48,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:48,337 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1603 transitions. [2021-05-22 02:27:48,337 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 19 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 19 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,337 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1603 transitions. [2021-05-22 02:27:48,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:48,337 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:48,337 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:48,537 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 532 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2655 [2021-05-22 02:27:48,538 INFO L430 AbstractCegarLoop]: === Iteration 544 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:48,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:48,538 INFO L82 PathProgramCache]: Analyzing trace with hash 2024385945, now seen corresponding path program 532 times [2021-05-22 02:27:48,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:48,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154649595] [2021-05-22 02:27:48,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:48,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:48,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:48,598 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:48,598 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154649595] [2021-05-22 02:27:48,599 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154649595] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:48,599 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539120445] [2021-05-22 02:27:48,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 533 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 533 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:48,623 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:48,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:48,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:48,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:48,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:48,642 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:48,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:48,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:48,645 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:27:48,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:48,661 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:48,663 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:48,663 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:48,663 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:48,664 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:48,671 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:48,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539120445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:48,672 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:48,672 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:27:48,672 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227283938] [2021-05-22 02:27:48,672 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:27:48,672 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:48,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:27:48,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:27:48,672 INFO L87 Difference]: Start difference. First operand 504 states and 1603 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:48,807 INFO L93 Difference]: Finished difference Result 779 states and 2413 transitions. [2021-05-22 02:27:48,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:48,807 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:48,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:48,808 INFO L225 Difference]: With dead ends: 779 [2021-05-22 02:27:48,808 INFO L226 Difference]: Without dead ends: 757 [2021-05-22 02:27:48,808 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 92.6ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:48,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 757 states. [2021-05-22 02:27:48,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 757 to 507. [2021-05-22 02:27:48,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.185770750988142) internal successors, (1612), 506 states have internal predecessors, (1612), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1612 transitions. [2021-05-22 02:27:48,813 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1612 transitions. Word has length 21 [2021-05-22 02:27:48,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:48,814 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1612 transitions. [2021-05-22 02:27:48,814 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:48,814 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1612 transitions. [2021-05-22 02:27:48,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:48,814 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:48,814 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:49,014 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 533 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2658 [2021-05-22 02:27:49,015 INFO L430 AbstractCegarLoop]: === Iteration 545 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:49,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:49,015 INFO L82 PathProgramCache]: Analyzing trace with hash 81685753, now seen corresponding path program 533 times [2021-05-22 02:27:49,015 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:49,015 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434453926] [2021-05-22 02:27:49,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:49,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:49,077 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:49,077 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:49,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434453926] [2021-05-22 02:27:49,077 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434453926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:49,077 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24854611] [2021-05-22 02:27:49,077 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 534 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 534 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:49,102 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:49,102 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:49,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:49,103 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:49,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:49,127 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:49,131 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,131 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:49,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:49,146 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,148 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:49,148 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:49,148 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,149 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:49,156 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:49,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [24854611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:49,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:49,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:27:49,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842748968] [2021-05-22 02:27:49,157 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:27:49,157 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:49,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:27:49,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:27:49,157 INFO L87 Difference]: Start difference. First operand 507 states and 1612 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:49,277 INFO L93 Difference]: Finished difference Result 686 states and 2140 transitions. [2021-05-22 02:27:49,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:49,277 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:49,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:49,278 INFO L225 Difference]: With dead ends: 686 [2021-05-22 02:27:49,278 INFO L226 Difference]: Without dead ends: 664 [2021-05-22 02:27:49,278 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 80.8ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:49,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2021-05-22 02:27:49,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 513. [2021-05-22 02:27:49,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 3.189453125) internal successors, (1633), 512 states have internal predecessors, (1633), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 1633 transitions. [2021-05-22 02:27:49,284 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 1633 transitions. Word has length 21 [2021-05-22 02:27:49,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:49,284 INFO L482 AbstractCegarLoop]: Abstraction has 513 states and 1633 transitions. [2021-05-22 02:27:49,284 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,284 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 1633 transitions. [2021-05-22 02:27:49,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:49,284 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:49,284 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:49,485 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2660,534 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:49,485 INFO L430 AbstractCegarLoop]: === Iteration 546 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:49,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:49,485 INFO L82 PathProgramCache]: Analyzing trace with hash -420105583, now seen corresponding path program 534 times [2021-05-22 02:27:49,485 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:49,485 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [850200802] [2021-05-22 02:27:49,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:49,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:49,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:49,550 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:49,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [850200802] [2021-05-22 02:27:49,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [850200802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:49,550 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561694527] [2021-05-22 02:27:49,550 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 535 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 535 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:49,575 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:49,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:49,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:49,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:49,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:49,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:49,605 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,605 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:49,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:49,615 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,619 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:49,619 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:49,619 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:49,619 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:49,632 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:49,633 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561694527] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:49,633 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:49,633 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:27:49,633 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803289864] [2021-05-22 02:27:49,633 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:27:49,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:49,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:27:49,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:27:49,633 INFO L87 Difference]: Start difference. First operand 513 states and 1633 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:49,753 INFO L93 Difference]: Finished difference Result 677 states and 2116 transitions. [2021-05-22 02:27:49,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:49,753 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:49,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:49,754 INFO L225 Difference]: With dead ends: 677 [2021-05-22 02:27:49,754 INFO L226 Difference]: Without dead ends: 655 [2021-05-22 02:27:49,754 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 84.1ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:49,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-05-22 02:27:49,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 510. [2021-05-22 02:27:49,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 509 states have (on average 3.1846758349705304) internal successors, (1621), 509 states have internal predecessors, (1621), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 1621 transitions. [2021-05-22 02:27:49,760 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 1621 transitions. Word has length 21 [2021-05-22 02:27:49,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:49,760 INFO L482 AbstractCegarLoop]: Abstraction has 510 states and 1621 transitions. [2021-05-22 02:27:49,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:49,760 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 1621 transitions. [2021-05-22 02:27:49,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:49,760 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:49,761 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:49,961 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 535 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2662 [2021-05-22 02:27:49,961 INFO L430 AbstractCegarLoop]: === Iteration 547 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:49,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:49,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1768077593, now seen corresponding path program 535 times [2021-05-22 02:27:49,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:49,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817831170] [2021-05-22 02:27:49,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:49,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:50,024 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:50,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:50,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817831170] [2021-05-22 02:27:50,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817831170] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:50,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [992803512] [2021-05-22 02:27:50,025 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 536 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 536 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:50,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:50,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:50,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:50,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:50,073 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:50,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,077 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:50,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:50,092 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,095 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:50,095 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:50,096 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,096 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:50,108 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:50,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [992803512] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:50,109 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:50,109 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:50,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202843445] [2021-05-22 02:27:50,109 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:50,109 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:50,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:50,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:50,109 INFO L87 Difference]: Start difference. First operand 510 states and 1621 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:50,248 INFO L93 Difference]: Finished difference Result 680 states and 2122 transitions. [2021-05-22 02:27:50,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:50,248 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:50,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:50,249 INFO L225 Difference]: With dead ends: 680 [2021-05-22 02:27:50,249 INFO L226 Difference]: Without dead ends: 658 [2021-05-22 02:27:50,249 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 86.5ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:50,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-05-22 02:27:50,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 504. [2021-05-22 02:27:50,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1868787276341948) internal successors, (1603), 503 states have internal predecessors, (1603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1603 transitions. [2021-05-22 02:27:50,255 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1603 transitions. Word has length 21 [2021-05-22 02:27:50,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:50,255 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1603 transitions. [2021-05-22 02:27:50,255 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,255 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1603 transitions. [2021-05-22 02:27:50,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:50,255 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:50,255 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:50,455 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 536 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2664 [2021-05-22 02:27:50,456 INFO L430 AbstractCegarLoop]: === Iteration 548 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:50,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:50,456 INFO L82 PathProgramCache]: Analyzing trace with hash 643694887, now seen corresponding path program 536 times [2021-05-22 02:27:50,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:50,456 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1344454185] [2021-05-22 02:27:50,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:50,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:50,513 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:50,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:50,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1344454185] [2021-05-22 02:27:50,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1344454185] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:50,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655985107] [2021-05-22 02:27:50,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 537 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 537 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:50,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:50,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:50,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:50,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:50,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:50,563 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:50,565 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:50,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:50,572 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:50,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:50,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,607 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:50,607 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:50,607 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:50,607 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:50,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:50,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655985107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:50,615 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:50,615 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:27:50,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555765886] [2021-05-22 02:27:50,616 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:27:50,616 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:50,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:27:50,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:50,616 INFO L87 Difference]: Start difference. First operand 504 states and 1603 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:50,794 INFO L93 Difference]: Finished difference Result 870 states and 2692 transitions. [2021-05-22 02:27:50,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:50,794 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:50,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:50,795 INFO L225 Difference]: With dead ends: 870 [2021-05-22 02:27:50,795 INFO L226 Difference]: Without dead ends: 848 [2021-05-22 02:27:50,795 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 123.9ms TimeCoverageRelationStatistics Valid=66, Invalid=206, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:50,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-05-22 02:27:50,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 507. [2021-05-22 02:27:50,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.183794466403162) internal successors, (1611), 506 states have internal predecessors, (1611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,801 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1611 transitions. [2021-05-22 02:27:50,801 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1611 transitions. Word has length 21 [2021-05-22 02:27:50,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:50,801 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1611 transitions. [2021-05-22 02:27:50,802 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:50,802 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1611 transitions. [2021-05-22 02:27:50,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:50,802 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:50,802 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:51,002 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2666,537 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:51,003 INFO L430 AbstractCegarLoop]: === Iteration 549 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:51,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:51,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1038441427, now seen corresponding path program 537 times [2021-05-22 02:27:51,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:51,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973790359] [2021-05-22 02:27:51,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:51,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:51,068 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:51,068 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:51,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973790359] [2021-05-22 02:27:51,068 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973790359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:51,068 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783528261] [2021-05-22 02:27:51,068 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 538 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 538 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:51,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:27:51,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:51,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:51,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:51,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:51,112 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:51,114 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,121 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:51,121 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:51,121 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:51,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:51,157 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,159 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:51,160 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:51,160 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,160 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:51,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:51,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783528261] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:51,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:51,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:51,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177738339] [2021-05-22 02:27:51,169 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:51,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:51,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:51,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:51,169 INFO L87 Difference]: Start difference. First operand 507 states and 1611 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:51,340 INFO L93 Difference]: Finished difference Result 789 states and 2455 transitions. [2021-05-22 02:27:51,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:51,341 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:51,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:51,342 INFO L225 Difference]: With dead ends: 789 [2021-05-22 02:27:51,342 INFO L226 Difference]: Without dead ends: 767 [2021-05-22 02:27:51,342 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 126.6ms TimeCoverageRelationStatistics Valid=61, Invalid=179, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:51,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-05-22 02:27:51,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 511. [2021-05-22 02:27:51,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 3.184313725490196) internal successors, (1624), 510 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 1624 transitions. [2021-05-22 02:27:51,348 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 1624 transitions. Word has length 21 [2021-05-22 02:27:51,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:51,348 INFO L482 AbstractCegarLoop]: Abstraction has 511 states and 1624 transitions. [2021-05-22 02:27:51,348 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,348 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 1624 transitions. [2021-05-22 02:27:51,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:51,348 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:51,348 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:51,549 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 538 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2669 [2021-05-22 02:27:51,549 INFO L430 AbstractCegarLoop]: === Iteration 550 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:51,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:51,549 INFO L82 PathProgramCache]: Analyzing trace with hash 842311511, now seen corresponding path program 538 times [2021-05-22 02:27:51,549 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:51,549 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541546846] [2021-05-22 02:27:51,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:51,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:51,611 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:51,612 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:51,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541546846] [2021-05-22 02:27:51,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [541546846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:51,612 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898482949] [2021-05-22 02:27:51,612 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 539 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 539 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:51,636 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:51,636 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:51,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:51,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:51,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:51,654 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:51,657 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,663 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:51,663 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:51,663 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:27:51,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:51,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:51,694 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:51,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:51,700 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:51,701 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:51,701 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:27:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:51,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898482949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:51,725 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:51,725 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:27:51,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072478721] [2021-05-22 02:27:51,726 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:27:51,726 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:51,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:27:51,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:51,726 INFO L87 Difference]: Start difference. First operand 511 states and 1624 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:51,932 INFO L93 Difference]: Finished difference Result 798 states and 2481 transitions. [2021-05-22 02:27:51,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:51,932 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:51,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:51,933 INFO L225 Difference]: With dead ends: 798 [2021-05-22 02:27:51,933 INFO L226 Difference]: Without dead ends: 769 [2021-05-22 02:27:51,933 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 133.7ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:51,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 769 states. [2021-05-22 02:27:51,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 769 to 503. [2021-05-22 02:27:51,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.183266932270916) internal successors, (1598), 502 states have internal predecessors, (1598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1598 transitions. [2021-05-22 02:27:51,939 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1598 transitions. Word has length 21 [2021-05-22 02:27:51,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:51,939 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1598 transitions. [2021-05-22 02:27:51,939 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:51,939 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1598 transitions. [2021-05-22 02:27:51,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:51,940 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:51,940 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:52,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 539 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2673 [2021-05-22 02:27:52,140 INFO L430 AbstractCegarLoop]: === Iteration 551 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:52,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:52,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1458565331, now seen corresponding path program 539 times [2021-05-22 02:27:52,141 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:52,141 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452938096] [2021-05-22 02:27:52,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:52,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:52,213 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:52,214 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:52,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452938096] [2021-05-22 02:27:52,214 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452938096] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:52,214 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823591609] [2021-05-22 02:27:52,214 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 540 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 540 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:52,239 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:52,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:52,239 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:52,240 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:52,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:52,293 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,297 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:52,297 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,297 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:52,327 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:52,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:52,330 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:52,330 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,330 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:52,338 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:52,338 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823591609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:52,338 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:52,338 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:52,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741772849] [2021-05-22 02:27:52,339 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:52,339 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:52,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:52,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:52,339 INFO L87 Difference]: Start difference. First operand 503 states and 1598 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:52,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:52,506 INFO L93 Difference]: Finished difference Result 658 states and 2055 transitions. [2021-05-22 02:27:52,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:52,507 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:52,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:52,508 INFO L225 Difference]: With dead ends: 658 [2021-05-22 02:27:52,508 INFO L226 Difference]: Without dead ends: 636 [2021-05-22 02:27:52,508 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 131.8ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:52,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-05-22 02:27:52,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 510. [2021-05-22 02:27:52,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 510 states, 509 states have (on average 3.1886051080550097) internal successors, (1623), 509 states have internal predecessors, (1623), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:52,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 510 states to 510 states and 1623 transitions. [2021-05-22 02:27:52,513 INFO L78 Accepts]: Start accepts. Automaton has 510 states and 1623 transitions. Word has length 21 [2021-05-22 02:27:52,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:52,513 INFO L482 AbstractCegarLoop]: Abstraction has 510 states and 1623 transitions. [2021-05-22 02:27:52,513 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:52,513 INFO L276 IsEmpty]: Start isEmpty. Operand 510 states and 1623 transitions. [2021-05-22 02:27:52,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:52,514 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:52,514 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:52,714 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2678,540 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:52,714 INFO L430 AbstractCegarLoop]: === Iteration 552 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:52,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:52,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1960356667, now seen corresponding path program 540 times [2021-05-22 02:27:52,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:52,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1862213599] [2021-05-22 02:27:52,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:52,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:52,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:52,789 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:52,789 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1862213599] [2021-05-22 02:27:52,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1862213599] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:52,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [449187258] [2021-05-22 02:27:52,790 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 541 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 541 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:52,814 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:52,815 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:52,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:52,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:52,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:52,879 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,882 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:52,883 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,883 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:52,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:52,900 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,903 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:52,903 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:52,904 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:52,904 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:52,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:52,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [449187258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:52,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:52,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:52,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533413910] [2021-05-22 02:27:52,917 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:52,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:52,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:52,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:52,918 INFO L87 Difference]: Start difference. First operand 510 states and 1623 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:53,068 INFO L93 Difference]: Finished difference Result 649 states and 2031 transitions. [2021-05-22 02:27:53,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:53,068 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:53,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:53,069 INFO L225 Difference]: With dead ends: 649 [2021-05-22 02:27:53,069 INFO L226 Difference]: Without dead ends: 627 [2021-05-22 02:27:53,069 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 135.3ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:53,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-05-22 02:27:53,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 507. [2021-05-22 02:27:53,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.183794466403162) internal successors, (1611), 506 states have internal predecessors, (1611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1611 transitions. [2021-05-22 02:27:53,074 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1611 transitions. Word has length 21 [2021-05-22 02:27:53,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:53,074 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1611 transitions. [2021-05-22 02:27:53,074 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,075 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1611 transitions. [2021-05-22 02:27:53,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:53,075 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:53,075 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:53,275 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2681,541 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:53,276 INFO L430 AbstractCegarLoop]: === Iteration 553 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:53,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:53,276 INFO L82 PathProgramCache]: Analyzing trace with hash 227826509, now seen corresponding path program 541 times [2021-05-22 02:27:53,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:53,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181728687] [2021-05-22 02:27:53,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:53,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:53,350 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:53,350 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:53,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181728687] [2021-05-22 02:27:53,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181728687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:53,350 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330146686] [2021-05-22 02:27:53,350 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 542 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 542 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:53,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:53,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:53,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:53,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:53,449 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,452 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:53,453 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,453 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:53,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:53,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:53,473 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:53,473 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,473 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:53,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:53,486 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330146686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:53,486 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:53,486 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:53,486 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566241556] [2021-05-22 02:27:53,486 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:53,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:53,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:53,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:53,487 INFO L87 Difference]: Start difference. First operand 507 states and 1611 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:53,633 INFO L93 Difference]: Finished difference Result 652 states and 2037 transitions. [2021-05-22 02:27:53,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:53,633 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:53,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:53,634 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:27:53,634 INFO L226 Difference]: Without dead ends: 630 [2021-05-22 02:27:53,634 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:53,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-05-22 02:27:53,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 504. [2021-05-22 02:27:53,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1848906560636183) internal successors, (1602), 503 states have internal predecessors, (1602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1602 transitions. [2021-05-22 02:27:53,639 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1602 transitions. Word has length 21 [2021-05-22 02:27:53,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:53,639 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1602 transitions. [2021-05-22 02:27:53,639 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:53,639 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1602 transitions. [2021-05-22 02:27:53,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:53,640 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:53,640 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:53,840 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 542 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2684 [2021-05-22 02:27:53,840 INFO L430 AbstractCegarLoop]: === Iteration 554 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:53,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:53,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1960579551, now seen corresponding path program 542 times [2021-05-22 02:27:53,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:53,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [287668318] [2021-05-22 02:27:53,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:53,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:53,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:53,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:53,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [287668318] [2021-05-22 02:27:53,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [287668318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:53,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124259153] [2021-05-22 02:27:53,918 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 543 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 543 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:53,942 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:53,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:53,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:53,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:53,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:53,984 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:53,986 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:53,995 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:53,995 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:53,995 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:54,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:54,053 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,056 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:54,056 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:54,056 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,056 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:54,064 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:54,064 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124259153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:54,065 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:54,065 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:54,065 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680230920] [2021-05-22 02:27:54,065 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:54,065 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:54,065 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:54,065 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:54,065 INFO L87 Difference]: Start difference. First operand 504 states and 1602 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:54,224 INFO L93 Difference]: Finished difference Result 670 states and 2091 transitions. [2021-05-22 02:27:54,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:54,224 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:54,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:54,225 INFO L225 Difference]: With dead ends: 670 [2021-05-22 02:27:54,225 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 02:27:54,225 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 155.6ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:54,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 02:27:54,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 511. [2021-05-22 02:27:54,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 3.1901960784313728) internal successors, (1627), 510 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 1627 transitions. [2021-05-22 02:27:54,231 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 1627 transitions. Word has length 21 [2021-05-22 02:27:54,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:54,231 INFO L482 AbstractCegarLoop]: Abstraction has 511 states and 1627 transitions. [2021-05-22 02:27:54,231 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,231 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 1627 transitions. [2021-05-22 02:27:54,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:54,232 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:54,232 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:54,432 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 543 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2687 [2021-05-22 02:27:54,432 INFO L430 AbstractCegarLoop]: === Iteration 555 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:54,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:54,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1458788215, now seen corresponding path program 543 times [2021-05-22 02:27:54,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:54,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740779390] [2021-05-22 02:27:54,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:54,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:54,508 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:54,508 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:54,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740779390] [2021-05-22 02:27:54,508 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740779390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:54,508 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1600949400] [2021-05-22 02:27:54,508 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 544 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 544 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:54,534 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:27:54,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:54,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:54,535 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:54,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:54,575 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:54,578 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:54,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:54,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:54,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:54,625 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,628 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:54,628 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:54,629 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:54,629 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:54,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:54,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1600949400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:54,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:54,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:54,642 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109925915] [2021-05-22 02:27:54,642 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:54,642 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:54,642 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:54,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:54,642 INFO L87 Difference]: Start difference. First operand 511 states and 1627 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:54,817 INFO L93 Difference]: Finished difference Result 661 states and 2067 transitions. [2021-05-22 02:27:54,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:54,817 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:54,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:54,818 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:27:54,818 INFO L226 Difference]: Without dead ends: 639 [2021-05-22 02:27:54,818 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 149.6ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:54,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-22 02:27:54,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 508. [2021-05-22 02:27:54,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 507 states have (on average 3.185404339250493) internal successors, (1615), 507 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 1615 transitions. [2021-05-22 02:27:54,829 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 1615 transitions. Word has length 21 [2021-05-22 02:27:54,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:54,829 INFO L482 AbstractCegarLoop]: Abstraction has 508 states and 1615 transitions. [2021-05-22 02:27:54,829 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:54,829 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 1615 transitions. [2021-05-22 02:27:54,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:54,830 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:54,830 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:55,030 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2691,544 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:55,030 INFO L430 AbstractCegarLoop]: === Iteration 556 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:55,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:55,031 INFO L82 PathProgramCache]: Analyzing trace with hash 545205239, now seen corresponding path program 544 times [2021-05-22 02:27:55,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:55,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1981879399] [2021-05-22 02:27:55,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:55,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:55,109 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:55,109 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:55,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1981879399] [2021-05-22 02:27:55,109 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1981879399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:55,109 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [280044606] [2021-05-22 02:27:55,109 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 545 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 545 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:55,135 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:55,135 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:55,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:55,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:55,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:55,179 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:55,188 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,196 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,197 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:55,197 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:55,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:55,247 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,254 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,255 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:55,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:55,257 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,263 INFO L518 ElimStorePlain]: Eliminatee v_prenex_125 vanished before elimination [2021-05-22 02:27:55,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:55,263 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:27:55,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:55,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [280044606] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:55,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:55,289 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:55,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391104830] [2021-05-22 02:27:55,289 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:55,289 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:55,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:55,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:55,289 INFO L87 Difference]: Start difference. First operand 508 states and 1615 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:55,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:55,506 INFO L93 Difference]: Finished difference Result 679 states and 2117 transitions. [2021-05-22 02:27:55,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:55,506 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:55,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:55,507 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:27:55,507 INFO L226 Difference]: Without dead ends: 650 [2021-05-22 02:27:55,508 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 168.1ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:55,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2021-05-22 02:27:55,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 505. [2021-05-22 02:27:55,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1884920634920637) internal successors, (1607), 504 states have internal predecessors, (1607), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:55,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1607 transitions. [2021-05-22 02:27:55,513 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1607 transitions. Word has length 21 [2021-05-22 02:27:55,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:55,513 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1607 transitions. [2021-05-22 02:27:55,513 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:55,513 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1607 transitions. [2021-05-22 02:27:55,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:55,514 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:55,514 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:55,714 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 545 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2695 [2021-05-22 02:27:55,714 INFO L430 AbstractCegarLoop]: === Iteration 557 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:55,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:55,714 INFO L82 PathProgramCache]: Analyzing trace with hash -1173779443, now seen corresponding path program 545 times [2021-05-22 02:27:55,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:55,715 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988833976] [2021-05-22 02:27:55,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:55,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:55,790 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:55,791 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:55,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988833976] [2021-05-22 02:27:55,791 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988833976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:55,791 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050065486] [2021-05-22 02:27:55,791 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 546 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 546 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:55,816 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:55,816 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:55,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:55,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:55,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:55,857 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:55,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,868 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,868 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:55,868 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:55,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:55,894 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,905 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:55,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:55,907 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:55,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:55,915 INFO L518 ElimStorePlain]: Eliminatee v_prenex_127 vanished before elimination [2021-05-22 02:27:55,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:55,916 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:27:55,948 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:55,948 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2050065486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:55,949 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:55,949 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:55,949 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427868536] [2021-05-22 02:27:55,949 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:55,949 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:55,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:55,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:55,949 INFO L87 Difference]: Start difference. First operand 505 states and 1607 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:56,116 INFO L93 Difference]: Finished difference Result 682 states and 2125 transitions. [2021-05-22 02:27:56,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:56,116 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:56,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:56,117 INFO L225 Difference]: With dead ends: 682 [2021-05-22 02:27:56,117 INFO L226 Difference]: Without dead ends: 653 [2021-05-22 02:27:56,117 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 159.9ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:27:56,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-05-22 02:27:56,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 504. [2021-05-22 02:27:56,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1848906560636183) internal successors, (1602), 503 states have internal predecessors, (1602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1602 transitions. [2021-05-22 02:27:56,123 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1602 transitions. Word has length 21 [2021-05-22 02:27:56,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:56,123 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1602 transitions. [2021-05-22 02:27:56,123 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,123 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1602 transitions. [2021-05-22 02:27:56,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:56,123 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:56,123 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:56,324 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2704,546 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:56,324 INFO L430 AbstractCegarLoop]: === Iteration 558 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:56,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:56,324 INFO L82 PathProgramCache]: Analyzing trace with hash 222607735, now seen corresponding path program 546 times [2021-05-22 02:27:56,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:56,324 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197046749] [2021-05-22 02:27:56,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:56,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:56,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:56,409 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:56,409 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197046749] [2021-05-22 02:27:56,410 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197046749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:56,410 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968619007] [2021-05-22 02:27:56,410 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 547 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 547 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:56,434 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:56,435 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:56,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:56,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:56,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:56,491 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:56,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:56,493 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:56,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:56,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:56,502 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:56,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:56,540 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:56,543 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:56,543 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:56,544 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:56,544 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:56,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:56,561 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968619007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:56,561 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:56,561 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:56,562 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [14939771] [2021-05-22 02:27:56,562 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:56,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:56,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:56,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:56,562 INFO L87 Difference]: Start difference. First operand 504 states and 1602 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:56,797 INFO L93 Difference]: Finished difference Result 660 states and 2061 transitions. [2021-05-22 02:27:56,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:56,797 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:56,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:56,798 INFO L225 Difference]: With dead ends: 660 [2021-05-22 02:27:56,798 INFO L226 Difference]: Without dead ends: 638 [2021-05-22 02:27:56,798 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 177.1ms TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:56,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 638 states. [2021-05-22 02:27:56,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 638 to 507. [2021-05-22 02:27:56,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.185770750988142) internal successors, (1612), 506 states have internal predecessors, (1612), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1612 transitions. [2021-05-22 02:27:56,803 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1612 transitions. Word has length 21 [2021-05-22 02:27:56,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:56,804 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1612 transitions. [2021-05-22 02:27:56,804 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:56,804 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1612 transitions. [2021-05-22 02:27:56,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:56,804 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:56,804 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:57,004 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2710,547 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:57,005 INFO L430 AbstractCegarLoop]: === Iteration 559 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:57,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:57,005 INFO L82 PathProgramCache]: Analyzing trace with hash -2022401915, now seen corresponding path program 547 times [2021-05-22 02:27:57,005 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:57,005 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1593566106] [2021-05-22 02:27:57,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:57,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:57,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:57,086 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:57,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1593566106] [2021-05-22 02:27:57,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1593566106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:57,086 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664579407] [2021-05-22 02:27:57,086 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 548 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 548 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:57,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:57,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:57,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:57,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:57,160 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:57,162 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,171 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:57,172 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:57,172 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:27:57,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:57,198 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,208 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:57,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:27:57,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:57,219 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:57,219 INFO L518 ElimStorePlain]: Eliminatee v_prenex_128 vanished before elimination [2021-05-22 02:27:57,220 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:27:57,220 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:27:57,253 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:57,254 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664579407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:57,254 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:57,254 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:57,254 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515540781] [2021-05-22 02:27:57,254 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:57,254 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:57,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:57,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:57,254 INFO L87 Difference]: Start difference. First operand 507 states and 1612 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:57,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:57,480 INFO L93 Difference]: Finished difference Result 675 states and 2105 transitions. [2021-05-22 02:27:57,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:57,480 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:57,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:57,481 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:27:57,481 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:27:57,481 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 186.3ms TimeCoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:27:57,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:27:57,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 502. [2021-05-22 02:27:57,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1816367265469063) internal successors, (1594), 501 states have internal predecessors, (1594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:57,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1594 transitions. [2021-05-22 02:27:57,486 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1594 transitions. Word has length 21 [2021-05-22 02:27:57,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:57,486 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1594 transitions. [2021-05-22 02:27:57,486 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:57,486 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1594 transitions. [2021-05-22 02:27:57,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:57,487 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:57,487 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:57,687 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 548 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2714 [2021-05-22 02:27:57,687 INFO L430 AbstractCegarLoop]: === Iteration 560 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:57,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:57,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1818185465, now seen corresponding path program 548 times [2021-05-22 02:27:57,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:57,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343324860] [2021-05-22 02:27:57,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:57,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:57,752 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:57,752 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:57,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343324860] [2021-05-22 02:27:57,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343324860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:57,752 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474280058] [2021-05-22 02:27:57,752 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 549 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 549 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:57,777 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:27:57,777 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:57,777 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:57,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:57,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:57,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,816 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:57,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,816 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:57,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:57,844 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,847 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:57,847 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:57,847 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:57,847 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:57,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:57,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474280058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:57,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:57,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:27:57,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667551333] [2021-05-22 02:27:57,855 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:27:57,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:57,856 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:27:57,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:57,856 INFO L87 Difference]: Start difference. First operand 502 states and 1594 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:57,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:57,998 INFO L93 Difference]: Finished difference Result 699 states and 2179 transitions. [2021-05-22 02:27:57,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:57,998 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:57,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:57,999 INFO L225 Difference]: With dead ends: 699 [2021-05-22 02:27:57,999 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:27:57,999 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 105.0ms TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:27:58,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:27:58,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 511. [2021-05-22 02:27:58,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 3.184313725490196) internal successors, (1624), 510 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:58,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 1624 transitions. [2021-05-22 02:27:58,005 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 1624 transitions. Word has length 21 [2021-05-22 02:27:58,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:58,005 INFO L482 AbstractCegarLoop]: Abstraction has 511 states and 1624 transitions. [2021-05-22 02:27:58,005 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:58,005 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 1624 transitions. [2021-05-22 02:27:58,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:58,006 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:58,006 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:58,206 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2720,549 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:58,206 INFO L430 AbstractCegarLoop]: === Iteration 561 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:58,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:58,206 INFO L82 PathProgramCache]: Analyzing trace with hash 1316394129, now seen corresponding path program 549 times [2021-05-22 02:27:58,206 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:58,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80655710] [2021-05-22 02:27:58,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:58,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:58,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:58,270 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:58,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80655710] [2021-05-22 02:27:58,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [80655710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:58,270 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262469058] [2021-05-22 02:27:58,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 550 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 550 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:58,295 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:27:58,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:58,295 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:58,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:58,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:58,330 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,333 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:58,334 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,334 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:58,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:58,348 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,351 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:58,351 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:58,352 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,352 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:58,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:58,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262469058] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:58,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:58,364 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:27:58,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531144815] [2021-05-22 02:27:58,365 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:27:58,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:58,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:27:58,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:27:58,365 INFO L87 Difference]: Start difference. First operand 511 states and 1624 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:58,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:58,494 INFO L93 Difference]: Finished difference Result 690 states and 2155 transitions. [2021-05-22 02:27:58,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:58,494 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:58,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:58,495 INFO L225 Difference]: With dead ends: 690 [2021-05-22 02:27:58,495 INFO L226 Difference]: Without dead ends: 668 [2021-05-22 02:27:58,495 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 97.6ms TimeCoverageRelationStatistics Valid=51, Invalid=159, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:58,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 668 states. [2021-05-22 02:27:58,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 668 to 508. [2021-05-22 02:27:58,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 507 states have (on average 3.1794871794871793) internal successors, (1612), 507 states have internal predecessors, (1612), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:58,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 1612 transitions. [2021-05-22 02:27:58,503 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 1612 transitions. Word has length 21 [2021-05-22 02:27:58,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:58,503 INFO L482 AbstractCegarLoop]: Abstraction has 508 states and 1612 transitions. [2021-05-22 02:27:58,504 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:58,504 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 1612 transitions. [2021-05-22 02:27:58,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:58,504 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:58,504 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:58,720 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 550 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2722 [2021-05-22 02:27:58,721 INFO L430 AbstractCegarLoop]: === Iteration 562 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:58,721 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:58,721 INFO L82 PathProgramCache]: Analyzing trace with hash -790389991, now seen corresponding path program 550 times [2021-05-22 02:27:58,721 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:58,721 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950570546] [2021-05-22 02:27:58,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:58,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:58,787 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:58,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:58,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950570546] [2021-05-22 02:27:58,788 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950570546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:58,788 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951941214] [2021-05-22 02:27:58,788 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 551 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 551 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:58,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:27:58,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:58,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:58,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:58,848 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:58,848 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,852 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:58,852 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,853 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:27:58,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:58,862 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,866 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:58,866 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:58,866 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:58,866 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:58,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:58,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951941214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:58,879 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:58,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:58,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181260320] [2021-05-22 02:27:58,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:58,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:58,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:58,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:58,880 INFO L87 Difference]: Start difference. First operand 508 states and 1612 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:59,013 INFO L93 Difference]: Finished difference Result 693 states and 2161 transitions. [2021-05-22 02:27:59,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:59,013 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:59,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:59,014 INFO L225 Difference]: With dead ends: 693 [2021-05-22 02:27:59,014 INFO L226 Difference]: Without dead ends: 671 [2021-05-22 02:27:59,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 96.8ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:27:59,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-05-22 02:27:59,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 505. [2021-05-22 02:27:59,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1805555555555554) internal successors, (1603), 504 states have internal predecessors, (1603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1603 transitions. [2021-05-22 02:27:59,019 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1603 transitions. Word has length 21 [2021-05-22 02:27:59,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:59,020 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1603 transitions. [2021-05-22 02:27:59,020 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,020 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1603 transitions. [2021-05-22 02:27:59,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:59,020 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:59,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:59,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2724,551 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:59,221 INFO L430 AbstractCegarLoop]: === Iteration 563 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:59,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:59,221 INFO L82 PathProgramCache]: Analyzing trace with hash 249845807, now seen corresponding path program 551 times [2021-05-22 02:27:59,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:59,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1155054163] [2021-05-22 02:27:59,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:59,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:59,282 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:59,282 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:59,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1155054163] [2021-05-22 02:27:59,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1155054163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:59,282 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1272581201] [2021-05-22 02:27:59,282 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 552 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 552 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:59,307 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:27:59,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:59,307 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:59,308 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:59,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:59,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,339 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:59,340 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,340 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:27:59,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:59,350 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:59,353 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:27:59,354 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,354 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:27:59,366 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:59,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1272581201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:59,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:59,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:27:59,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727944952] [2021-05-22 02:27:59,367 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:27:59,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:59,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:27:59,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:27:59,367 INFO L87 Difference]: Start difference. First operand 505 states and 1603 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:27:59,517 INFO L93 Difference]: Finished difference Result 777 states and 2407 transitions. [2021-05-22 02:27:59,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:27:59,517 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:27:59,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:27:59,518 INFO L225 Difference]: With dead ends: 777 [2021-05-22 02:27:59,519 INFO L226 Difference]: Without dead ends: 755 [2021-05-22 02:27:59,519 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 19 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 97.9ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:59,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-05-22 02:27:59,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 502. [2021-05-22 02:27:59,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1816367265469063) internal successors, (1594), 501 states have internal predecessors, (1594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1594 transitions. [2021-05-22 02:27:59,524 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1594 transitions. Word has length 21 [2021-05-22 02:27:59,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:27:59,524 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1594 transitions. [2021-05-22 02:27:59,524 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:27:59,525 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1594 transitions. [2021-05-22 02:27:59,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:27:59,525 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:27:59,530 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:27:59,730 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 552 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2726 [2021-05-22 02:27:59,730 INFO L430 AbstractCegarLoop]: === Iteration 564 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:27:59,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:27:59,730 INFO L82 PathProgramCache]: Analyzing trace with hash -940974683, now seen corresponding path program 552 times [2021-05-22 02:27:59,730 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:27:59,731 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883742749] [2021-05-22 02:27:59,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:27:59,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:27:59,803 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:59,803 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:27:59,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883742749] [2021-05-22 02:27:59,803 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883742749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:59,803 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066948863] [2021-05-22 02:27:59,803 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 553 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 553 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:27:59,827 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:27:59,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:27:59,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:27:59,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:27:59,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:27:59,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:59,886 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,886 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:27:59,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:27:59,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:27:59,919 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:27:59,919 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:27:59,919 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:27:59,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:27:59,928 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066948863] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:27:59,928 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:27:59,928 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:27:59,928 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457301652] [2021-05-22 02:27:59,928 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:27:59,928 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:27:59,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:27:59,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:27:59,928 INFO L87 Difference]: Start difference. First operand 502 states and 1594 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:00,098 INFO L93 Difference]: Finished difference Result 668 states and 2085 transitions. [2021-05-22 02:28:00,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:00,099 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:00,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:00,100 INFO L225 Difference]: With dead ends: 668 [2021-05-22 02:28:00,100 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:28:00,100 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 131.1ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:00,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:28:00,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 508. [2021-05-22 02:28:00,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 507 states have (on average 3.185404339250493) internal successors, (1615), 507 states have internal predecessors, (1615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 1615 transitions. [2021-05-22 02:28:00,105 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 1615 transitions. Word has length 21 [2021-05-22 02:28:00,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:00,106 INFO L482 AbstractCegarLoop]: Abstraction has 508 states and 1615 transitions. [2021-05-22 02:28:00,106 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,106 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 1615 transitions. [2021-05-22 02:28:00,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:00,106 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:00,106 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:00,306 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2728,553 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:00,307 INFO L430 AbstractCegarLoop]: === Iteration 565 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:00,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:00,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1442766019, now seen corresponding path program 553 times [2021-05-22 02:28:00,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:00,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1611053457] [2021-05-22 02:28:00,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:00,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:00,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:00,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:00,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1611053457] [2021-05-22 02:28:00,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1611053457] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:00,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742164805] [2021-05-22 02:28:00,381 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 554 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 554 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:00,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:00,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:00,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:00,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:00,469 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:00,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:00,473 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:00,473 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:28:00,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:00,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:00,492 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:00,493 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:00,493 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:00,493 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:00,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:00,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742164805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:00,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:00,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:00,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [594698754] [2021-05-22 02:28:00,506 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:00,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:00,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:00,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:00,507 INFO L87 Difference]: Start difference. First operand 508 states and 1615 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:00,677 INFO L93 Difference]: Finished difference Result 659 states and 2061 transitions. [2021-05-22 02:28:00,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:00,677 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:00,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:00,678 INFO L225 Difference]: With dead ends: 659 [2021-05-22 02:28:00,678 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:28:00,678 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 133.6ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:00,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:28:00,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 505. [2021-05-22 02:28:00,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1805555555555554) internal successors, (1603), 504 states have internal predecessors, (1603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1603 transitions. [2021-05-22 02:28:00,683 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1603 transitions. Word has length 21 [2021-05-22 02:28:00,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:00,683 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1603 transitions. [2021-05-22 02:28:00,683 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:00,683 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1603 transitions. [2021-05-22 02:28:00,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:00,684 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:00,684 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:00,884 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 554 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2731 [2021-05-22 02:28:00,884 INFO L430 AbstractCegarLoop]: === Iteration 566 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:00,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:00,884 INFO L82 PathProgramCache]: Analyzing trace with hash 745417157, now seen corresponding path program 554 times [2021-05-22 02:28:00,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:00,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010258432] [2021-05-22 02:28:00,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:00,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:00,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:00,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:00,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010258432] [2021-05-22 02:28:00,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010258432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:00,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1276630548] [2021-05-22 02:28:00,960 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 555 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 555 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:00,984 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:00,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:00,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:00,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:01,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:01,049 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,052 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:01,053 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,053 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:28:01,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:01,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,073 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:01,073 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:01,073 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,073 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:01,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:01,086 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1276630548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:01,086 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:01,086 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:01,087 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55230867] [2021-05-22 02:28:01,087 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:01,087 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:01,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:01,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:01,087 INFO L87 Difference]: Start difference. First operand 505 states and 1603 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:01,228 INFO L93 Difference]: Finished difference Result 662 states and 2067 transitions. [2021-05-22 02:28:01,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:01,229 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:01,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:01,230 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:28:01,230 INFO L226 Difference]: Without dead ends: 640 [2021-05-22 02:28:01,230 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:01,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-05-22 02:28:01,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 502. [2021-05-22 02:28:01,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1816367265469063) internal successors, (1594), 501 states have internal predecessors, (1594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1594 transitions. [2021-05-22 02:28:01,235 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1594 transitions. Word has length 21 [2021-05-22 02:28:01,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:01,235 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1594 transitions. [2021-05-22 02:28:01,235 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,235 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1594 transitions. [2021-05-22 02:28:01,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:01,236 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:01,236 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:01,436 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2734,555 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:01,437 INFO L430 AbstractCegarLoop]: === Iteration 567 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:01,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:01,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1816797097, now seen corresponding path program 555 times [2021-05-22 02:28:01,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:01,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [116893918] [2021-05-22 02:28:01,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:01,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:01,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:01,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:01,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [116893918] [2021-05-22 02:28:01,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [116893918] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:01,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144733340] [2021-05-22 02:28:01,511 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 556 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 556 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:01,536 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:28:01,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:01,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:01,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:01,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:01,577 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:01,579 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:01,588 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:01,588 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:01,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:01,640 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:01,642 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:01,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:01,643 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:01,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:01,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144733340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:01,651 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:01,651 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:01,651 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2680479] [2021-05-22 02:28:01,651 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:01,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:01,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:01,651 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:01,651 INFO L87 Difference]: Start difference. First operand 502 states and 1594 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:01,846 INFO L93 Difference]: Finished difference Result 676 states and 2108 transitions. [2021-05-22 02:28:01,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:01,847 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:01,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:01,848 INFO L225 Difference]: With dead ends: 676 [2021-05-22 02:28:01,848 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:28:01,848 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 167.7ms TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:01,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:28:01,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 508. [2021-05-22 02:28:01,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 508 states, 507 states have (on average 3.1834319526627217) internal successors, (1614), 507 states have internal predecessors, (1614), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 508 states to 508 states and 1614 transitions. [2021-05-22 02:28:01,853 INFO L78 Accepts]: Start accepts. Automaton has 508 states and 1614 transitions. Word has length 21 [2021-05-22 02:28:01,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:01,853 INFO L482 AbstractCegarLoop]: Abstraction has 508 states and 1614 transitions. [2021-05-22 02:28:01,853 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:01,853 INFO L276 IsEmpty]: Start isEmpty. Operand 508 states and 1614 transitions. [2021-05-22 02:28:01,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:01,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:01,854 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:02,054 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2737,556 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:02,055 INFO L430 AbstractCegarLoop]: === Iteration 568 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:02,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:02,055 INFO L82 PathProgramCache]: Analyzing trace with hash 1976378863, now seen corresponding path program 556 times [2021-05-22 02:28:02,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:02,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994350305] [2021-05-22 02:28:02,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:02,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:02,129 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:02,129 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:02,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994350305] [2021-05-22 02:28:02,129 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994350305] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:02,129 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1323958425] [2021-05-22 02:28:02,129 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 557 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 557 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:02,153 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:02,154 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:02,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:02,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:02,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:02,195 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:02,197 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:02,206 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:02,206 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:02,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:02,244 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,247 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:02,247 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:02,247 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,248 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:02,261 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1323958425] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:02,261 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:02,261 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:02,261 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806284112] [2021-05-22 02:28:02,261 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:02,261 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:02,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:02,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:02,261 INFO L87 Difference]: Start difference. First operand 508 states and 1614 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:02,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:02,473 INFO L93 Difference]: Finished difference Result 667 states and 2084 transitions. [2021-05-22 02:28:02,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:02,473 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:02,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:02,474 INFO L225 Difference]: With dead ends: 667 [2021-05-22 02:28:02,474 INFO L226 Difference]: Without dead ends: 645 [2021-05-22 02:28:02,474 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 159.2ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:02,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 645 states. [2021-05-22 02:28:02,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 645 to 505. [2021-05-22 02:28:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1785714285714284) internal successors, (1602), 504 states have internal predecessors, (1602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:02,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1602 transitions. [2021-05-22 02:28:02,480 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1602 transitions. Word has length 21 [2021-05-22 02:28:02,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:02,480 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1602 transitions. [2021-05-22 02:28:02,480 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:02,480 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1602 transitions. [2021-05-22 02:28:02,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:02,480 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:02,480 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:02,680 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2741,557 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:02,681 INFO L430 AbstractCegarLoop]: === Iteration 569 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:02,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:02,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1062795887, now seen corresponding path program 557 times [2021-05-22 02:28:02,681 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:02,681 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [322623572] [2021-05-22 02:28:02,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:02,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:02,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:02,757 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:02,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [322623572] [2021-05-22 02:28:02,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [322623572] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:02,757 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3937304] [2021-05-22 02:28:02,757 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 558 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 558 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:02,782 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:02,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:02,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:02,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:02,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:02,830 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:02,834 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:02,843 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:02,843 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:02,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:02,893 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,900 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:02,901 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:02,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:02,903 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:02,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:02,909 INFO L518 ElimStorePlain]: Eliminatee v_prenex_131 vanished before elimination [2021-05-22 02:28:02,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:02,909 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:02,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:02,935 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3937304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:02,935 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:02,935 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:02,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637625547] [2021-05-22 02:28:02,935 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:02,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:02,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:02,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:02,935 INFO L87 Difference]: Start difference. First operand 505 states and 1602 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:03,124 INFO L93 Difference]: Finished difference Result 685 states and 2134 transitions. [2021-05-22 02:28:03,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:03,125 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:03,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:03,126 INFO L225 Difference]: With dead ends: 685 [2021-05-22 02:28:03,126 INFO L226 Difference]: Without dead ends: 656 [2021-05-22 02:28:03,126 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 179.4ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:03,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-05-22 02:28:03,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 502. [2021-05-22 02:28:03,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1816367265469063) internal successors, (1594), 501 states have internal predecessors, (1594), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1594 transitions. [2021-05-22 02:28:03,131 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1594 transitions. Word has length 21 [2021-05-22 02:28:03,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:03,131 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1594 transitions. [2021-05-22 02:28:03,131 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,131 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1594 transitions. [2021-05-22 02:28:03,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:03,132 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:03,132 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:03,332 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2745,558 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:03,332 INFO L430 AbstractCegarLoop]: === Iteration 570 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:03,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:03,333 INFO L82 PathProgramCache]: Analyzing trace with hash -656188795, now seen corresponding path program 558 times [2021-05-22 02:28:03,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:03,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016342559] [2021-05-22 02:28:03,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:03,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:03,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:03,414 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:03,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016342559] [2021-05-22 02:28:03,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2016342559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:03,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959324950] [2021-05-22 02:28:03,415 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 559 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 559 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:03,441 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:03,441 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:03,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:03,442 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:03,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:03,484 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:03,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:03,486 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:03,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:03,496 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:03,496 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:03,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:03,523 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:03,533 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:03,534 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:03,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:03,536 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:03,544 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:03,544 INFO L518 ElimStorePlain]: Eliminatee v_prenex_133 vanished before elimination [2021-05-22 02:28:03,545 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:03,545 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:03,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:03,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959324950] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:03,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:03,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:03,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901065415] [2021-05-22 02:28:03,578 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:03,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:03,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:03,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:03,579 INFO L87 Difference]: Start difference. First operand 502 states and 1594 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:03,771 INFO L93 Difference]: Finished difference Result 688 states and 2142 transitions. [2021-05-22 02:28:03,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:03,771 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:03,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:03,772 INFO L225 Difference]: With dead ends: 688 [2021-05-22 02:28:03,772 INFO L226 Difference]: Without dead ends: 659 [2021-05-22 02:28:03,772 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 178.1ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:03,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-05-22 02:28:03,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 501. [2021-05-22 02:28:03,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 500 states have (on average 3.178) internal successors, (1589), 500 states have internal predecessors, (1589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 1589 transitions. [2021-05-22 02:28:03,777 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 1589 transitions. Word has length 21 [2021-05-22 02:28:03,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:03,777 INFO L482 AbstractCegarLoop]: Abstraction has 501 states and 1589 transitions. [2021-05-22 02:28:03,777 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:03,777 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 1589 transitions. [2021-05-22 02:28:03,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:03,778 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:03,778 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:03,978 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 559 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2754 [2021-05-22 02:28:03,979 INFO L430 AbstractCegarLoop]: === Iteration 571 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:03,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:03,979 INFO L82 PathProgramCache]: Analyzing trace with hash 740198383, now seen corresponding path program 559 times [2021-05-22 02:28:03,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:03,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885070392] [2021-05-22 02:28:03,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:03,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:04,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:04,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:04,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885070392] [2021-05-22 02:28:04,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885070392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:04,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [166893725] [2021-05-22 02:28:04,056 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 560 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 560 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:04,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:04,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:04,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:04,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:04,131 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:04,133 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,142 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:04,142 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:04,142 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:04,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:04,181 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,184 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:04,184 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:04,185 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,185 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:04,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:04,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [166893725] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:04,198 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:04,198 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:04,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715262573] [2021-05-22 02:28:04,198 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:04,198 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:04,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:04,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:04,199 INFO L87 Difference]: Start difference. First operand 501 states and 1589 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:04,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:04,418 INFO L93 Difference]: Finished difference Result 666 states and 2078 transitions. [2021-05-22 02:28:04,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:04,418 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:04,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:04,419 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:28:04,419 INFO L226 Difference]: Without dead ends: 644 [2021-05-22 02:28:04,419 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 161.0ms TimeCoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:04,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-22 02:28:04,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 504. [2021-05-22 02:28:04,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1789264413518885) internal successors, (1599), 503 states have internal predecessors, (1599), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:04,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1599 transitions. [2021-05-22 02:28:04,425 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1599 transitions. Word has length 21 [2021-05-22 02:28:04,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:04,425 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1599 transitions. [2021-05-22 02:28:04,425 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:04,425 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1599 transitions. [2021-05-22 02:28:04,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:04,426 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:04,426 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:04,626 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 560 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2760 [2021-05-22 02:28:04,626 INFO L430 AbstractCegarLoop]: === Iteration 572 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:04,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:04,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1504811267, now seen corresponding path program 560 times [2021-05-22 02:28:04,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:04,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1319387115] [2021-05-22 02:28:04,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:04,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:04,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:04,706 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:04,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1319387115] [2021-05-22 02:28:04,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1319387115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:04,706 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1417149371] [2021-05-22 02:28:04,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 561 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 561 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:04,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:04,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:04,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:04,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:04,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:04,782 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:04,784 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,793 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:04,793 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:04,793 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:04,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:04,820 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,831 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:04,831 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:04,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:04,833 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:04,841 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:04,842 INFO L518 ElimStorePlain]: Eliminatee v_prenex_135 vanished before elimination [2021-05-22 02:28:04,842 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:04,842 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:04,878 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:04,878 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1417149371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:04,878 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:04,878 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:04,878 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509192587] [2021-05-22 02:28:04,879 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:04,879 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:04,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:04,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:04,879 INFO L87 Difference]: Start difference. First operand 504 states and 1599 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:05,129 INFO L93 Difference]: Finished difference Result 681 states and 2122 transitions. [2021-05-22 02:28:05,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:05,130 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:05,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:05,130 INFO L225 Difference]: With dead ends: 681 [2021-05-22 02:28:05,130 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:28:05,131 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 172.3ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:05,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:28:05,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 500. [2021-05-22 02:28:05,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.176352705410822) internal successors, (1585), 499 states have internal predecessors, (1585), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1585 transitions. [2021-05-22 02:28:05,136 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1585 transitions. Word has length 21 [2021-05-22 02:28:05,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:05,136 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1585 transitions. [2021-05-22 02:28:05,136 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,136 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1585 transitions. [2021-05-22 02:28:05,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:05,137 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:05,137 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:05,337 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2764,561 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:05,337 INFO L430 AbstractCegarLoop]: === Iteration 573 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:05,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:05,337 INFO L82 PathProgramCache]: Analyzing trace with hash 88063813, now seen corresponding path program 561 times [2021-05-22 02:28:05,337 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:05,337 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022715390] [2021-05-22 02:28:05,337 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:05,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:05,399 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:05,399 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:05,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022715390] [2021-05-22 02:28:05,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022715390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:05,399 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [832466370] [2021-05-22 02:28:05,399 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 562 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 562 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:05,424 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:28:05,424 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:05,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:05,425 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:05,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:05,452 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:05,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:05,454 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:05,460 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:05,461 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:05,461 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:05,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:05,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:05,492 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:05,492 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:05,493 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:05,493 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:05,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:05,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [832466370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:05,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:05,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:28:05,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396557368] [2021-05-22 02:28:05,506 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:28:05,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:05,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:28:05,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:05,507 INFO L87 Difference]: Start difference. First operand 500 states and 1585 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:05,666 INFO L93 Difference]: Finished difference Result 853 states and 2638 transitions. [2021-05-22 02:28:05,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:05,667 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:05,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:05,668 INFO L225 Difference]: With dead ends: 853 [2021-05-22 02:28:05,668 INFO L226 Difference]: Without dead ends: 831 [2021-05-22 02:28:05,668 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 121.9ms TimeCoverageRelationStatistics Valid=67, Invalid=205, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:05,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 831 states. [2021-05-22 02:28:05,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 831 to 502. [2021-05-22 02:28:05,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1736526946107784) internal successors, (1590), 501 states have internal predecessors, (1590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1590 transitions. [2021-05-22 02:28:05,674 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1590 transitions. Word has length 21 [2021-05-22 02:28:05,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:05,674 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1590 transitions. [2021-05-22 02:28:05,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:05,674 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1590 transitions. [2021-05-22 02:28:05,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:05,675 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:05,675 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:05,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2770,562 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:05,875 INFO L430 AbstractCegarLoop]: === Iteration 574 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:05,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:05,875 INFO L82 PathProgramCache]: Analyzing trace with hash -2079151335, now seen corresponding path program 562 times [2021-05-22 02:28:05,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:05,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889091638] [2021-05-22 02:28:05,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:05,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:05,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:05,950 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:05,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889091638] [2021-05-22 02:28:05,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889091638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:05,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [171872307] [2021-05-22 02:28:05,950 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 563 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 563 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:05,975 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:05,975 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:05,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:05,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:06,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:06,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:06,014 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,020 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:06,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:06,021 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:06,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:06,074 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:06,077 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:06,078 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,078 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:06,093 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:06,093 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [171872307] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:06,093 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:06,093 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:06,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971318524] [2021-05-22 02:28:06,094 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:06,094 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:06,094 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:06,094 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:06,094 INFO L87 Difference]: Start difference. First operand 502 states and 1590 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:06,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:06,321 INFO L93 Difference]: Finished difference Result 776 states and 2411 transitions. [2021-05-22 02:28:06,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:06,322 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:06,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:06,323 INFO L225 Difference]: With dead ends: 776 [2021-05-22 02:28:06,323 INFO L226 Difference]: Without dead ends: 754 [2021-05-22 02:28:06,323 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 179.4ms TimeCoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:28:06,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-05-22 02:28:06,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 504. [2021-05-22 02:28:06,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 503 states have (on average 3.1709741550695827) internal successors, (1595), 503 states have internal predecessors, (1595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:06,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 1595 transitions. [2021-05-22 02:28:06,329 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 1595 transitions. Word has length 21 [2021-05-22 02:28:06,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:06,329 INFO L482 AbstractCegarLoop]: Abstraction has 504 states and 1595 transitions. [2021-05-22 02:28:06,329 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:06,329 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 1595 transitions. [2021-05-22 02:28:06,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:06,330 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:06,330 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:06,530 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 563 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2773 [2021-05-22 02:28:06,530 INFO L430 AbstractCegarLoop]: === Iteration 575 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:06,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:06,530 INFO L82 PathProgramCache]: Analyzing trace with hash -29193689, now seen corresponding path program 563 times [2021-05-22 02:28:06,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:06,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863436843] [2021-05-22 02:28:06,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:06,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:06,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:06,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:06,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863436843] [2021-05-22 02:28:06,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863436843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:06,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704342618] [2021-05-22 02:28:06,601 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 564 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 564 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:06,625 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:06,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:06,626 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:06,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:06,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:06,672 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:06,674 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,682 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:06,682 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:06,683 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:06,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:06,733 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:06,736 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:06,747 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:06,747 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:06,748 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:06,748 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:06,793 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:06,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704342618] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:06,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:06,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:06,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404748076] [2021-05-22 02:28:06,793 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:06,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:06,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:06,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:06,794 INFO L87 Difference]: Start difference. First operand 504 states and 1595 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:07,068 INFO L93 Difference]: Finished difference Result 787 states and 2438 transitions. [2021-05-22 02:28:07,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:07,068 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:07,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:07,069 INFO L225 Difference]: With dead ends: 787 [2021-05-22 02:28:07,069 INFO L226 Difference]: Without dead ends: 758 [2021-05-22 02:28:07,069 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 230.9ms TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:28:07,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 758 states. [2021-05-22 02:28:07,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 758 to 500. [2021-05-22 02:28:07,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.164328657314629) internal successors, (1579), 499 states have internal predecessors, (1579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1579 transitions. [2021-05-22 02:28:07,075 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1579 transitions. Word has length 21 [2021-05-22 02:28:07,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:07,075 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1579 transitions. [2021-05-22 02:28:07,075 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,075 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1579 transitions. [2021-05-22 02:28:07,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:07,075 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:07,075 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:07,276 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 564 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2777 [2021-05-22 02:28:07,276 INFO L430 AbstractCegarLoop]: === Iteration 576 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:07,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:07,276 INFO L82 PathProgramCache]: Analyzing trace with hash -1865307033, now seen corresponding path program 564 times [2021-05-22 02:28:07,276 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:07,276 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894184124] [2021-05-22 02:28:07,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:07,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:07,342 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:07,342 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:07,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894184124] [2021-05-22 02:28:07,342 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894184124] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:07,342 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019381150] [2021-05-22 02:28:07,342 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 565 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 565 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:07,367 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:07,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:07,368 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:07,368 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:07,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:07,402 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,405 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:07,405 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,405 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:28:07,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:07,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,424 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:07,424 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:07,424 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,424 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:07,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:07,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019381150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:07,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:07,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:07,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472229843] [2021-05-22 02:28:07,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:07,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:07,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:07,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:07,433 INFO L87 Difference]: Start difference. First operand 500 states and 1579 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:07,567 INFO L93 Difference]: Finished difference Result 678 states and 2097 transitions. [2021-05-22 02:28:07,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:07,567 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:07,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:07,568 INFO L225 Difference]: With dead ends: 678 [2021-05-22 02:28:07,568 INFO L226 Difference]: Without dead ends: 656 [2021-05-22 02:28:07,568 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 82.0ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:07,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-05-22 02:28:07,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 500. [2021-05-22 02:28:07,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.164328657314629) internal successors, (1579), 499 states have internal predecessors, (1579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1579 transitions. [2021-05-22 02:28:07,574 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1579 transitions. Word has length 21 [2021-05-22 02:28:07,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:07,574 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1579 transitions. [2021-05-22 02:28:07,574 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:07,574 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1579 transitions. [2021-05-22 02:28:07,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:07,575 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:07,575 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:07,783 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2782,565 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:07,783 INFO L430 AbstractCegarLoop]: === Iteration 577 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:07,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:07,783 INFO L82 PathProgramCache]: Analyzing trace with hash 486960071, now seen corresponding path program 565 times [2021-05-22 02:28:07,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:07,784 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [741442573] [2021-05-22 02:28:07,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:07,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:07,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:07,860 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:07,860 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [741442573] [2021-05-22 02:28:07,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [741442573] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:07,861 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [384232945] [2021-05-22 02:28:07,861 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 566 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 566 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:07,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:07,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:07,886 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:07,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:07,912 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,916 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:07,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,916 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:07,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:07,931 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,934 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:07,934 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:07,934 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:07,934 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:07,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:07,942 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [384232945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:07,942 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:07,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:07,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477162796] [2021-05-22 02:28:07,943 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:07,943 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:07,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:07,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:07,943 INFO L87 Difference]: Start difference. First operand 500 states and 1579 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:08,051 INFO L93 Difference]: Finished difference Result 615 states and 1917 transitions. [2021-05-22 02:28:08,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:08,051 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:08,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:08,052 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:28:08,052 INFO L226 Difference]: Without dead ends: 593 [2021-05-22 02:28:08,052 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 77.6ms TimeCoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:08,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-05-22 02:28:08,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 506. [2021-05-22 02:28:08,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 505 states have (on average 3.1683168316831685) internal successors, (1600), 505 states have internal predecessors, (1600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 1600 transitions. [2021-05-22 02:28:08,057 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 1600 transitions. Word has length 21 [2021-05-22 02:28:08,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:08,057 INFO L482 AbstractCegarLoop]: Abstraction has 506 states and 1600 transitions. [2021-05-22 02:28:08,057 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,057 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 1600 transitions. [2021-05-22 02:28:08,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:08,058 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:08,058 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:08,258 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 566 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2784 [2021-05-22 02:28:08,258 INFO L430 AbstractCegarLoop]: === Iteration 578 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:08,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:08,259 INFO L82 PathProgramCache]: Analyzing trace with hash -14831265, now seen corresponding path program 566 times [2021-05-22 02:28:08,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:08,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [141004811] [2021-05-22 02:28:08,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:08,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:08,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:08,333 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:08,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [141004811] [2021-05-22 02:28:08,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [141004811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:08,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1749696400] [2021-05-22 02:28:08,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 567 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 567 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:08,358 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:08,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:08,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:08,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:08,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:08,385 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,389 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:08,389 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,389 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:08,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:08,399 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,402 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:08,402 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:08,403 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,403 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:08,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:08,416 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1749696400] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:08,416 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:08,416 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:08,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200854263] [2021-05-22 02:28:08,416 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:08,416 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:08,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:08,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:08,417 INFO L87 Difference]: Start difference. First operand 506 states and 1600 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:08,524 INFO L93 Difference]: Finished difference Result 624 states and 1941 transitions. [2021-05-22 02:28:08,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:08,524 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:08,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:08,525 INFO L225 Difference]: With dead ends: 624 [2021-05-22 02:28:08,525 INFO L226 Difference]: Without dead ends: 602 [2021-05-22 02:28:08,525 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 76.3ms TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:08,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 602 states. [2021-05-22 02:28:08,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 602 to 503. [2021-05-22 02:28:08,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.1633466135458166) internal successors, (1588), 502 states have internal predecessors, (1588), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1588 transitions. [2021-05-22 02:28:08,530 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1588 transitions. Word has length 21 [2021-05-22 02:28:08,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:08,530 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1588 transitions. [2021-05-22 02:28:08,530 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:08,530 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1588 transitions. [2021-05-22 02:28:08,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:08,531 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:08,531 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:08,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2786,567 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:08,731 INFO L430 AbstractCegarLoop]: === Iteration 579 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:08,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:08,732 INFO L82 PathProgramCache]: Analyzing trace with hash -2121615385, now seen corresponding path program 567 times [2021-05-22 02:28:08,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:08,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110951250] [2021-05-22 02:28:08,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:08,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:08,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:08,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:08,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110951250] [2021-05-22 02:28:08,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110951250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:08,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373131412] [2021-05-22 02:28:08,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 568 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 568 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:08,830 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:08,830 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:08,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:08,831 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:08,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:08,857 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,861 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:08,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,861 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:08,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:08,876 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,880 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:08,880 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:08,880 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:08,880 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:08,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:08,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373131412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:08,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:08,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:28:08,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [144291304] [2021-05-22 02:28:08,894 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:28:08,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:08,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:28:08,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:28:08,894 INFO L87 Difference]: Start difference. First operand 503 states and 1588 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:09,037 INFO L93 Difference]: Finished difference Result 612 states and 1908 transitions. [2021-05-22 02:28:09,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:09,037 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:09,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:09,038 INFO L225 Difference]: With dead ends: 612 [2021-05-22 02:28:09,038 INFO L226 Difference]: Without dead ends: 590 [2021-05-22 02:28:09,038 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 94.0ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:09,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-22 02:28:09,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 497. [2021-05-22 02:28:09,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1653225806451615) internal successors, (1570), 496 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1570 transitions. [2021-05-22 02:28:09,043 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1570 transitions. Word has length 21 [2021-05-22 02:28:09,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:09,043 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1570 transitions. [2021-05-22 02:28:09,043 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,043 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1570 transitions. [2021-05-22 02:28:09,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:09,044 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:09,044 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:09,244 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 568 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2788 [2021-05-22 02:28:09,244 INFO L430 AbstractCegarLoop]: === Iteration 580 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:09,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:09,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1267485953, now seen corresponding path program 568 times [2021-05-22 02:28:09,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:09,245 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [433319] [2021-05-22 02:28:09,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:09,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:09,319 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:09,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:09,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [433319] [2021-05-22 02:28:09,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [433319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:09,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [544013803] [2021-05-22 02:28:09,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 569 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 569 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:09,344 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:09,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:09,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:09,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:09,384 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:09,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:09,385 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:09,390 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:09,390 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:09,390 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:30, output treesize:23 [2021-05-22 02:28:09,465 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:28:09,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:09,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:09,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:09,470 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:09,479 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:09,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:09,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:09,482 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:09,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:09,491 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:09,491 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:5 [2021-05-22 02:28:09,516 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:09,517 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [544013803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:09,517 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:09,517 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:09,517 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239394034] [2021-05-22 02:28:09,517 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:09,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:09,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:09,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:09,517 INFO L87 Difference]: Start difference. First operand 497 states and 1570 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:09,822 INFO L93 Difference]: Finished difference Result 877 states and 2702 transitions. [2021-05-22 02:28:09,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:09,822 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:09,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:09,823 INFO L225 Difference]: With dead ends: 877 [2021-05-22 02:28:09,823 INFO L226 Difference]: Without dead ends: 838 [2021-05-22 02:28:09,823 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 206.8ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:28:09,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 838 states. [2021-05-22 02:28:09,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 838 to 501. [2021-05-22 02:28:09,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 500 states have (on average 3.16) internal successors, (1580), 500 states have internal predecessors, (1580), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 1580 transitions. [2021-05-22 02:28:09,829 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 1580 transitions. Word has length 21 [2021-05-22 02:28:09,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:09,829 INFO L482 AbstractCegarLoop]: Abstraction has 501 states and 1580 transitions. [2021-05-22 02:28:09,830 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:09,830 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 1580 transitions. [2021-05-22 02:28:09,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:09,830 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:09,830 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:10,030 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2790,569 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:10,031 INFO L430 AbstractCegarLoop]: === Iteration 581 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:10,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:10,031 INFO L82 PathProgramCache]: Analyzing trace with hash 128016029, now seen corresponding path program 569 times [2021-05-22 02:28:10,031 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:10,031 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [111066352] [2021-05-22 02:28:10,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:10,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:10,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:10,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:10,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [111066352] [2021-05-22 02:28:10,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [111066352] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:10,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [329154264] [2021-05-22 02:28:10,106 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 570 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 570 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:10,131 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:10,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:10,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:10,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:10,206 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:10,206 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:10,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:10,207 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:10,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:10,210 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:10,216 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:10,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:10,217 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:35, output treesize:18 [2021-05-22 02:28:10,314 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:28:10,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:10,316 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:10,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:10,324 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:10,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:10,325 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:10,331 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:10,332 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:10,332 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:28:10,365 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:10,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [329154264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:10,365 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:10,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:10,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147751289] [2021-05-22 02:28:10,365 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:10,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:10,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:10,366 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:10,366 INFO L87 Difference]: Start difference. First operand 501 states and 1580 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:10,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:10,851 INFO L93 Difference]: Finished difference Result 987 states and 3041 transitions. [2021-05-22 02:28:10,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:28:10,852 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:10,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:10,853 INFO L225 Difference]: With dead ends: 987 [2021-05-22 02:28:10,853 INFO L226 Difference]: Without dead ends: 968 [2021-05-22 02:28:10,853 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 379.0ms TimeCoverageRelationStatistics Valid=137, Invalid=675, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:28:10,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 968 states. [2021-05-22 02:28:10,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 968 to 497. [2021-05-22 02:28:10,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1653225806451615) internal successors, (1570), 496 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:10,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1570 transitions. [2021-05-22 02:28:10,860 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1570 transitions. Word has length 21 [2021-05-22 02:28:10,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:10,860 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1570 transitions. [2021-05-22 02:28:10,860 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:10,860 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1570 transitions. [2021-05-22 02:28:10,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:10,861 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:10,861 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:11,061 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 570 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2798 [2021-05-22 02:28:11,061 INFO L430 AbstractCegarLoop]: === Iteration 582 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:11,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:11,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1361649761, now seen corresponding path program 570 times [2021-05-22 02:28:11,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:11,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084180514] [2021-05-22 02:28:11,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:11,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:11,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:11,143 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:11,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084180514] [2021-05-22 02:28:11,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084180514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:11,143 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706795455] [2021-05-22 02:28:11,143 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 571 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 571 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:11,167 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:11,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:11,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:11,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:11,221 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:11,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:11,222 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,228 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,229 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:11,229 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:28:11,288 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:28:11,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:11,291 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:11,294 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,303 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,304 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:11,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:11,305 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,314 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,315 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:11,315 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:5 [2021-05-22 02:28:11,341 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:11,341 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706795455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:11,341 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:11,341 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:11,342 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579965721] [2021-05-22 02:28:11,342 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:11,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:11,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:11,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:11,342 INFO L87 Difference]: Start difference. First operand 497 states and 1570 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:11,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:11,529 INFO L93 Difference]: Finished difference Result 801 states and 2463 transitions. [2021-05-22 02:28:11,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:28:11,530 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:11,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:11,531 INFO L225 Difference]: With dead ends: 801 [2021-05-22 02:28:11,531 INFO L226 Difference]: Without dead ends: 741 [2021-05-22 02:28:11,531 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 177.6ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:11,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2021-05-22 02:28:11,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 500. [2021-05-22 02:28:11,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.164328657314629) internal successors, (1579), 499 states have internal predecessors, (1579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:11,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1579 transitions. [2021-05-22 02:28:11,536 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1579 transitions. Word has length 21 [2021-05-22 02:28:11,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:11,536 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1579 transitions. [2021-05-22 02:28:11,537 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:11,537 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1579 transitions. [2021-05-22 02:28:11,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:11,537 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:11,537 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:11,737 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 571 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2804 [2021-05-22 02:28:11,738 INFO L430 AbstractCegarLoop]: === Iteration 583 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:11,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:11,738 INFO L82 PathProgramCache]: Analyzing trace with hash -338847589, now seen corresponding path program 571 times [2021-05-22 02:28:11,738 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:11,738 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [683014445] [2021-05-22 02:28:11,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:11,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:11,819 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:11,820 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:11,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [683014445] [2021-05-22 02:28:11,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [683014445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:11,820 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359795710] [2021-05-22 02:28:11,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 572 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 572 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:11,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:11,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:11,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:11,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:11,897 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,902 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,903 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,903 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:11,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:11,938 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,940 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:11,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:11,941 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:11,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:11,952 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:11,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:11,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:11,961 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:13 [2021-05-22 02:28:12,011 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:12,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359795710] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:12,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:12,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:12,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163182958] [2021-05-22 02:28:12,012 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:12,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:12,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:12,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:12,012 INFO L87 Difference]: Start difference. First operand 500 states and 1579 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:12,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:12,256 INFO L93 Difference]: Finished difference Result 697 states and 2169 transitions. [2021-05-22 02:28:12,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:12,256 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:12,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:12,257 INFO L225 Difference]: With dead ends: 697 [2021-05-22 02:28:12,257 INFO L226 Difference]: Without dead ends: 670 [2021-05-22 02:28:12,257 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 185.4ms TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:28:12,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-22 02:28:12,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 503. [2021-05-22 02:28:12,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.1653386454183265) internal successors, (1589), 502 states have internal predecessors, (1589), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:12,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1589 transitions. [2021-05-22 02:28:12,262 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1589 transitions. Word has length 21 [2021-05-22 02:28:12,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:12,262 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1589 transitions. [2021-05-22 02:28:12,262 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:12,262 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1589 transitions. [2021-05-22 02:28:12,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:12,263 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:12,263 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:12,463 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 572 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2812 [2021-05-22 02:28:12,463 INFO L430 AbstractCegarLoop]: === Iteration 584 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:12,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:12,464 INFO L82 PathProgramCache]: Analyzing trace with hash -623110273, now seen corresponding path program 572 times [2021-05-22 02:28:12,464 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:12,464 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386559333] [2021-05-22 02:28:12,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:12,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:12,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:12,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:12,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386559333] [2021-05-22 02:28:12,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386559333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:12,548 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107622905] [2021-05-22 02:28:12,548 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 573 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 573 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:12,572 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:12,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:12,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:12,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:12,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:12,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:12,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:12,630 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:12,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:12,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:12,639 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:12,668 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:12,668 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:12,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:12,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:12,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:12,672 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:12,684 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:12,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:12,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:12,686 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:12,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:12,698 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:12,698 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:28:12,747 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:12,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107622905] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:12,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:12,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:12,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053458502] [2021-05-22 02:28:12,748 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:12,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:12,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:12,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:12,748 INFO L87 Difference]: Start difference. First operand 503 states and 1589 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:13,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:13,021 INFO L93 Difference]: Finished difference Result 725 states and 2245 transitions. [2021-05-22 02:28:13,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:13,022 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:13,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:13,023 INFO L225 Difference]: With dead ends: 725 [2021-05-22 02:28:13,023 INFO L226 Difference]: Without dead ends: 698 [2021-05-22 02:28:13,023 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 228.0ms TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:28:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-22 02:28:13,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 516. [2021-05-22 02:28:13,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 516 states, 515 states have (on average 3.1611650485436895) internal successors, (1628), 515 states have internal predecessors, (1628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:13,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 516 states to 516 states and 1628 transitions. [2021-05-22 02:28:13,028 INFO L78 Accepts]: Start accepts. Automaton has 516 states and 1628 transitions. Word has length 21 [2021-05-22 02:28:13,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:13,028 INFO L482 AbstractCegarLoop]: Abstraction has 516 states and 1628 transitions. [2021-05-22 02:28:13,029 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:13,029 INFO L276 IsEmpty]: Start isEmpty. Operand 516 states and 1628 transitions. [2021-05-22 02:28:13,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:13,029 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:13,029 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:13,229 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2818,573 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:13,230 INFO L430 AbstractCegarLoop]: === Iteration 585 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:13,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:13,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1063281567, now seen corresponding path program 573 times [2021-05-22 02:28:13,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:13,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693964510] [2021-05-22 02:28:13,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:13,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:13,320 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:13,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:13,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693964510] [2021-05-22 02:28:13,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693964510] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:13,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476470403] [2021-05-22 02:28:13,320 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 574 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 574 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:13,345 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:13,345 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:13,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:28:13,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:13,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:13,429 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:28:13,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:13,434 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:13,437 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,475 INFO L628 ElimStorePlain]: treesize reduction 11, result has 82.3 percent of original size [2021-05-22 02:28:13,475 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:28:13,475 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:101, output treesize:51 [2021-05-22 02:28:13,539 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,540 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:13,541 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,543 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:28:13,544 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:13,561 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,562 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,562 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:13,562 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,564 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:13,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:28:13,565 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:13,579 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:13,580 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:13,580 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:71, output treesize:21 [2021-05-22 02:28:13,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:13,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476470403] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:13,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:13,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:13,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337160329] [2021-05-22 02:28:13,630 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:13,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:13,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:13,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:13,631 INFO L87 Difference]: Start difference. First operand 516 states and 1628 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:14,263 INFO L93 Difference]: Finished difference Result 715 states and 2190 transitions. [2021-05-22 02:28:14,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-22 02:28:14,263 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:14,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:14,264 INFO L225 Difference]: With dead ends: 715 [2021-05-22 02:28:14,264 INFO L226 Difference]: Without dead ends: 673 [2021-05-22 02:28:14,264 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 617.9ms TimeCoverageRelationStatistics Valid=139, Invalid=617, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:28:14,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-22 02:28:14,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 502. [2021-05-22 02:28:14,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1756487025948106) internal successors, (1591), 501 states have internal predecessors, (1591), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,270 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1591 transitions. [2021-05-22 02:28:14,270 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1591 transitions. Word has length 21 [2021-05-22 02:28:14,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:14,270 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1591 transitions. [2021-05-22 02:28:14,270 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,270 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1591 transitions. [2021-05-22 02:28:14,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:14,270 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:14,270 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:14,471 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2826,574 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:14,471 INFO L430 AbstractCegarLoop]: === Iteration 586 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:14,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:14,471 INFO L82 PathProgramCache]: Analyzing trace with hash 1048969205, now seen corresponding path program 574 times [2021-05-22 02:28:14,471 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:14,471 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945997085] [2021-05-22 02:28:14,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:14,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:14,537 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:14,537 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:14,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945997085] [2021-05-22 02:28:14,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1945997085] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:14,538 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145702021] [2021-05-22 02:28:14,538 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 575 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 575 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:14,562 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:14,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:14,563 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:14,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:14,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:14,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:14,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:14,585 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:14,591 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:14,592 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:14,592 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:14,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:14,615 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:14,617 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:14,617 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:14,618 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:14,618 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:14,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:14,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145702021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:14,626 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:14,626 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:14,626 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1100379913] [2021-05-22 02:28:14,626 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:14,626 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:14,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:14,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:14,627 INFO L87 Difference]: Start difference. First operand 502 states and 1591 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:14,763 INFO L93 Difference]: Finished difference Result 872 states and 2704 transitions. [2021-05-22 02:28:14,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:14,763 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:14,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:14,764 INFO L225 Difference]: With dead ends: 872 [2021-05-22 02:28:14,764 INFO L226 Difference]: Without dead ends: 850 [2021-05-22 02:28:14,765 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 86.5ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:14,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 850 states. [2021-05-22 02:28:14,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 850 to 505. [2021-05-22 02:28:14,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 505 states, 504 states have (on average 3.1785714285714284) internal successors, (1602), 504 states have internal predecessors, (1602), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 505 states to 505 states and 1602 transitions. [2021-05-22 02:28:14,776 INFO L78 Accepts]: Start accepts. Automaton has 505 states and 1602 transitions. Word has length 21 [2021-05-22 02:28:14,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:14,776 INFO L482 AbstractCegarLoop]: Abstraction has 505 states and 1602 transitions. [2021-05-22 02:28:14,776 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:14,776 INFO L276 IsEmpty]: Start isEmpty. Operand 505 states and 1602 transitions. [2021-05-22 02:28:14,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:14,776 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:14,776 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:14,977 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2836,575 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:14,977 INFO L430 AbstractCegarLoop]: === Iteration 587 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:14,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:14,977 INFO L82 PathProgramCache]: Analyzing trace with hash -84054495, now seen corresponding path program 575 times [2021-05-22 02:28:14,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:14,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1415412585] [2021-05-22 02:28:14,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:14,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:15,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:15,056 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:15,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1415412585] [2021-05-22 02:28:15,056 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1415412585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:15,056 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1670812107] [2021-05-22 02:28:15,056 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 576 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 576 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:15,081 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:15,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:15,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:15,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:15,107 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:15,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:15,108 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,114 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:15,115 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:15,115 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:28:15,217 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:28:15,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:15,220 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:15,223 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:15,233 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:15,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:15,234 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,243 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:15,244 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:15,244 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:5 [2021-05-22 02:28:15,270 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:15,270 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1670812107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:15,270 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:15,270 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:15,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1279600698] [2021-05-22 02:28:15,270 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:15,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:15,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:15,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:15,270 INFO L87 Difference]: Start difference. First operand 505 states and 1602 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:15,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:15,547 INFO L93 Difference]: Finished difference Result 900 states and 2764 transitions. [2021-05-22 02:28:15,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:15,547 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:15,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:15,548 INFO L225 Difference]: With dead ends: 900 [2021-05-22 02:28:15,548 INFO L226 Difference]: Without dead ends: 861 [2021-05-22 02:28:15,548 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 221.2ms TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:28:15,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2021-05-22 02:28:15,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 506. [2021-05-22 02:28:15,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 506 states, 505 states have (on average 3.1702970297029704) internal successors, (1601), 505 states have internal predecessors, (1601), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:15,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 506 states to 506 states and 1601 transitions. [2021-05-22 02:28:15,555 INFO L78 Accepts]: Start accepts. Automaton has 506 states and 1601 transitions. Word has length 21 [2021-05-22 02:28:15,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:15,555 INFO L482 AbstractCegarLoop]: Abstraction has 506 states and 1601 transitions. [2021-05-22 02:28:15,555 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:15,555 INFO L276 IsEmpty]: Start isEmpty. Operand 506 states and 1601 transitions. [2021-05-22 02:28:15,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:15,555 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:15,555 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:15,756 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 576 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2839 [2021-05-22 02:28:15,756 INFO L430 AbstractCegarLoop]: === Iteration 588 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:15,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:15,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1311447487, now seen corresponding path program 576 times [2021-05-22 02:28:15,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:15,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186449964] [2021-05-22 02:28:15,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:15,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:15,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:15,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:15,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186449964] [2021-05-22 02:28:15,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186449964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:15,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088714532] [2021-05-22 02:28:15,840 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 577 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 577 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:15,864 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:15,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:15,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:15,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:15,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:15,905 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:15,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:15,907 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:15,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:15,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:15,916 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:16,029 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:28:16,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:16,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,036 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:16,038 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:16,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:16,039 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:16,044 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,044 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:28:16,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:16,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088714532] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:16,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:16,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:16,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944677766] [2021-05-22 02:28:16,070 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:16,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:16,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:16,071 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:16,071 INFO L87 Difference]: Start difference. First operand 506 states and 1601 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:16,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:16,525 INFO L93 Difference]: Finished difference Result 933 states and 2862 transitions. [2021-05-22 02:28:16,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:28:16,525 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:16,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:16,526 INFO L225 Difference]: With dead ends: 933 [2021-05-22 02:28:16,526 INFO L226 Difference]: Without dead ends: 914 [2021-05-22 02:28:16,526 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 369.3ms TimeCoverageRelationStatistics Valid=134, Invalid=622, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:28:16,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 914 states. [2021-05-22 02:28:16,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 914 to 490. [2021-05-22 02:28:16,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.16359918200409) internal successors, (1547), 489 states have internal predecessors, (1547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:16,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1547 transitions. [2021-05-22 02:28:16,533 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1547 transitions. Word has length 21 [2021-05-22 02:28:16,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:16,533 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1547 transitions. [2021-05-22 02:28:16,533 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:16,533 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1547 transitions. [2021-05-22 02:28:16,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:16,534 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:16,534 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:16,734 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2847,577 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:16,734 INFO L430 AbstractCegarLoop]: === Iteration 589 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:16,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:16,734 INFO L82 PathProgramCache]: Analyzing trace with hash -633167109, now seen corresponding path program 577 times [2021-05-22 02:28:16,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:16,735 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848238014] [2021-05-22 02:28:16,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:16,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:16,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:16,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:16,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848238014] [2021-05-22 02:28:16,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848238014] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:16,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094212212] [2021-05-22 02:28:16,805 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 578 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 578 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:16,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:16,830 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:16,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:16,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:16,850 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:16,852 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:16,859 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:16,859 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:16,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:16,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,886 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:16,886 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:16,887 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:16,887 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:16,909 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:16,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094212212] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:16,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:16,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:16,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080721486] [2021-05-22 02:28:16,909 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:16,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:16,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:16,910 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:16,910 INFO L87 Difference]: Start difference. First operand 490 states and 1547 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:17,079 INFO L93 Difference]: Finished difference Result 775 states and 2407 transitions. [2021-05-22 02:28:17,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:17,080 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:17,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:17,081 INFO L225 Difference]: With dead ends: 775 [2021-05-22 02:28:17,081 INFO L226 Difference]: Without dead ends: 753 [2021-05-22 02:28:17,081 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 106.4ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:17,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 753 states. [2021-05-22 02:28:17,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 753 to 493. [2021-05-22 02:28:17,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.160569105691057) internal successors, (1555), 492 states have internal predecessors, (1555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1555 transitions. [2021-05-22 02:28:17,087 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1555 transitions. Word has length 21 [2021-05-22 02:28:17,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:17,087 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1555 transitions. [2021-05-22 02:28:17,087 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,087 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1555 transitions. [2021-05-22 02:28:17,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:17,087 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:17,087 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:17,288 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 578 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2858 [2021-05-22 02:28:17,288 INFO L430 AbstractCegarLoop]: === Iteration 590 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:17,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:17,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1247585829, now seen corresponding path program 578 times [2021-05-22 02:28:17,288 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:17,288 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610813281] [2021-05-22 02:28:17,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:17,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:17,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:17,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:17,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610813281] [2021-05-22 02:28:17,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610813281] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:17,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538966548] [2021-05-22 02:28:17,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 579 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 579 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:17,413 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:17,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:17,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:17,414 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:17,435 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:17,436 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:17,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:17,439 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:17,446 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:17,447 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:17,447 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:17,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:17,474 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:17,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:17,476 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:17,482 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:17,483 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:17,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:17,483 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:17,501 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:17,502 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538966548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:17,502 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:17,502 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:17,502 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037004347] [2021-05-22 02:28:17,502 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:17,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:17,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:17,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:17,502 INFO L87 Difference]: Start difference. First operand 493 states and 1555 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:17,666 INFO L93 Difference]: Finished difference Result 783 states and 2427 transitions. [2021-05-22 02:28:17,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:17,667 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:17,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:17,668 INFO L225 Difference]: With dead ends: 783 [2021-05-22 02:28:17,668 INFO L226 Difference]: Without dead ends: 754 [2021-05-22 02:28:17,668 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:17,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-05-22 02:28:17,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 484. [2021-05-22 02:28:17,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:17,673 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:17,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:17,673 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:17,673 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:17,673 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:17,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:17,674 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:17,674 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:17,874 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 579 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2862 [2021-05-22 02:28:17,874 INFO L430 AbstractCegarLoop]: === Iteration 591 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:17,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:17,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1053291013, now seen corresponding path program 579 times [2021-05-22 02:28:17,875 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:17,875 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909573258] [2021-05-22 02:28:17,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:17,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:17,965 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:17,965 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:17,965 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909573258] [2021-05-22 02:28:17,966 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909573258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:17,966 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131649694] [2021-05-22 02:28:17,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 580 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 580 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:17,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:28:17,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:17,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:17,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:18,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:18,052 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,057 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:18,058 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,058 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:28:18,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:18,098 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:18,101 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:18,102 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,102 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:18,111 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:18,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131649694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:18,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:18,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:18,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544343396] [2021-05-22 02:28:18,112 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:18,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:18,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:18,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:18,112 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:18,218 INFO L93 Difference]: Finished difference Result 638 states and 1978 transitions. [2021-05-22 02:28:18,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:18,219 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:18,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:18,220 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:28:18,220 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:28:18,220 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 137.1ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:18,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:28:18,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 490. [2021-05-22 02:28:18,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.1574642126789367) internal successors, (1544), 489 states have internal predecessors, (1544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1544 transitions. [2021-05-22 02:28:18,225 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1544 transitions. Word has length 21 [2021-05-22 02:28:18,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:18,225 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1544 transitions. [2021-05-22 02:28:18,225 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,225 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1544 transitions. [2021-05-22 02:28:18,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:18,226 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:18,226 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:18,426 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 580 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2867 [2021-05-22 02:28:18,426 INFO L430 AbstractCegarLoop]: === Iteration 592 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:18,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:18,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1555082349, now seen corresponding path program 580 times [2021-05-22 02:28:18,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:18,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466473927] [2021-05-22 02:28:18,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:18,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:18,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:18,524 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:18,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466473927] [2021-05-22 02:28:18,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1466473927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:18,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585446363] [2021-05-22 02:28:18,524 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 581 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 581 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:18,549 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:18,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:18,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:18,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:18,662 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:18,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:18,663 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:18,674 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:18,675 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:32 [2021-05-22 02:28:18,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:18,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:18,704 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,712 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:18,714 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:18,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:18,715 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,723 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:18,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:18,724 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:28:18,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:18,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585446363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:18,743 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:18,743 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:18,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754517557] [2021-05-22 02:28:18,743 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:18,743 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:18,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:18,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:18,744 INFO L87 Difference]: Start difference. First operand 490 states and 1544 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:18,872 INFO L93 Difference]: Finished difference Result 629 states and 1954 transitions. [2021-05-22 02:28:18,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:18,873 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:18,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:18,874 INFO L225 Difference]: With dead ends: 629 [2021-05-22 02:28:18,874 INFO L226 Difference]: Without dead ends: 607 [2021-05-22 02:28:18,874 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 170.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:18,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-22 02:28:18,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 487. [2021-05-22 02:28:18,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.152263374485597) internal successors, (1532), 486 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1532 transitions. [2021-05-22 02:28:18,879 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1532 transitions. Word has length 21 [2021-05-22 02:28:18,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:18,879 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1532 transitions. [2021-05-22 02:28:18,879 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:18,879 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1532 transitions. [2021-05-22 02:28:18,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:18,879 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:18,880 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:19,080 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2870,581 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:19,080 INFO L430 AbstractCegarLoop]: === Iteration 593 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:19,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:19,080 INFO L82 PathProgramCache]: Analyzing trace with hash 633100827, now seen corresponding path program 581 times [2021-05-22 02:28:19,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:19,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [573457207] [2021-05-22 02:28:19,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:19,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:19,160 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:19,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:19,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [573457207] [2021-05-22 02:28:19,160 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [573457207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:19,160 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424853416] [2021-05-22 02:28:19,160 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 582 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 582 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:19,184 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:19,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:19,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:19,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:19,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:19,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:19,285 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:19,293 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:19,293 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:28:19,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:19,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:19,320 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,328 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:19,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:19,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:19,331 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,338 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:19,339 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,339 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:28:19,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:19,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424853416] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:19,358 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:19,358 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:19,358 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206028830] [2021-05-22 02:28:19,358 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:19,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:19,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:19,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:19,358 INFO L87 Difference]: Start difference. First operand 487 states and 1532 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:19,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:19,551 INFO L93 Difference]: Finished difference Result 632 states and 1960 transitions. [2021-05-22 02:28:19,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:19,552 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:19,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:19,553 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:28:19,553 INFO L226 Difference]: Without dead ends: 610 [2021-05-22 02:28:19,553 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 175.0ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:19,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-22 02:28:19,557 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 484. [2021-05-22 02:28:19,557 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:19,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:19,558 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:19,558 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:19,558 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:19,558 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:19,558 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:19,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:19,558 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:19,558 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:19,759 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 582 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2873 [2021-05-22 02:28:19,759 INFO L430 AbstractCegarLoop]: === Iteration 594 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:19,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:19,759 INFO L82 PathProgramCache]: Analyzing trace with hash -1929113427, now seen corresponding path program 582 times [2021-05-22 02:28:19,759 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:19,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615517258] [2021-05-22 02:28:19,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:19,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:19,844 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:19,844 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:19,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615517258] [2021-05-22 02:28:19,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615517258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:19,844 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409857712] [2021-05-22 02:28:19,844 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 583 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 583 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:19,868 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:19,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:19,869 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:19,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:19,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:19,911 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:19,913 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:19,922 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:19,922 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:19,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:19,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,976 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:19,976 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:19,977 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:19,977 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:19,985 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:19,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [409857712] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:19,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:19,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:19,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [338183886] [2021-05-22 02:28:19,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:19,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:19,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:19,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:19,985 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:20,100 INFO L93 Difference]: Finished difference Result 652 states and 2024 transitions. [2021-05-22 02:28:20,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:20,100 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:20,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:20,101 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:28:20,101 INFO L226 Difference]: Without dead ends: 630 [2021-05-22 02:28:20,101 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 131.1ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:20,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 630 states. [2021-05-22 02:28:20,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 630 to 491. [2021-05-22 02:28:20,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.1653061224489796) internal successors, (1551), 490 states have internal predecessors, (1551), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1551 transitions. [2021-05-22 02:28:20,106 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1551 transitions. Word has length 21 [2021-05-22 02:28:20,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:20,106 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1551 transitions. [2021-05-22 02:28:20,106 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,106 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1551 transitions. [2021-05-22 02:28:20,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:20,106 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:20,107 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:20,307 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 583 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2876 [2021-05-22 02:28:20,307 INFO L430 AbstractCegarLoop]: === Iteration 595 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:20,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:20,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1864062533, now seen corresponding path program 583 times [2021-05-22 02:28:20,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:20,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996297893] [2021-05-22 02:28:20,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:20,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:20,396 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:20,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996297893] [2021-05-22 02:28:20,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [996297893] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:20,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398407962] [2021-05-22 02:28:20,396 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 584 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 584 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:20,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:20,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:20,421 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:20,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:20,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:20,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:20,467 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:20,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:20,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:20,476 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:20,513 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:20,514 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:20,517 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:20,517 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:20,518 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:20,518 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:20,531 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:20,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398407962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:20,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:20,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:20,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846786565] [2021-05-22 02:28:20,531 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:20,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:20,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:20,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:20,532 INFO L87 Difference]: Start difference. First operand 491 states and 1551 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:20,716 INFO L93 Difference]: Finished difference Result 643 states and 2000 transitions. [2021-05-22 02:28:20,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:20,716 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:20,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:20,717 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:28:20,717 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:28:20,717 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 125.3ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:20,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:28:20,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 488. [2021-05-22 02:28:20,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.1601642710472277) internal successors, (1539), 487 states have internal predecessors, (1539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1539 transitions. [2021-05-22 02:28:20,722 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1539 transitions. Word has length 21 [2021-05-22 02:28:20,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:20,722 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1539 transitions. [2021-05-22 02:28:20,722 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:20,722 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1539 transitions. [2021-05-22 02:28:20,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:20,723 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:20,723 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:20,923 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2880,584 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:20,923 INFO L430 AbstractCegarLoop]: === Iteration 596 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:20,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:20,924 INFO L82 PathProgramCache]: Analyzing trace with hash -1525997921, now seen corresponding path program 584 times [2021-05-22 02:28:20,924 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:20,924 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [146365742] [2021-05-22 02:28:20,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:20,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:20,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:20,998 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:20,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [146365742] [2021-05-22 02:28:20,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [146365742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:20,998 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025845885] [2021-05-22 02:28:20,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 585 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 585 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:21,022 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:21,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:21,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:21,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:21,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:21,065 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,070 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:21,070 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,071 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:21,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:21,121 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:21,123 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:21,125 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:21,125 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:21,126 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:28:21,133 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:21,133 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025845885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:21,133 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:21,133 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:21,133 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053839402] [2021-05-22 02:28:21,133 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:21,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:21,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:21,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:21,133 INFO L87 Difference]: Start difference. First operand 488 states and 1539 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:21,303 INFO L93 Difference]: Finished difference Result 621 states and 1918 transitions. [2021-05-22 02:28:21,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:21,304 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:21,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:21,304 INFO L225 Difference]: With dead ends: 621 [2021-05-22 02:28:21,304 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:28:21,305 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 115.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:21,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:28:21,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 490. [2021-05-22 02:28:21,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.1513292433537834) internal successors, (1541), 489 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1541 transitions. [2021-05-22 02:28:21,310 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1541 transitions. Word has length 21 [2021-05-22 02:28:21,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:21,310 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1541 transitions. [2021-05-22 02:28:21,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,310 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1541 transitions. [2021-05-22 02:28:21,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:21,310 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:21,310 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:21,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 585 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2884 [2021-05-22 02:28:21,511 INFO L430 AbstractCegarLoop]: === Iteration 597 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:21,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:21,511 INFO L82 PathProgramCache]: Analyzing trace with hash 98339847, now seen corresponding path program 585 times [2021-05-22 02:28:21,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:21,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673307388] [2021-05-22 02:28:21,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:21,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:21,588 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:21,588 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:21,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673307388] [2021-05-22 02:28:21,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673307388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:21,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050618996] [2021-05-22 02:28:21,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 586 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 586 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:21,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:28:21,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:21,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:21,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:21,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:21,647 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,652 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:21,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,652 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:21,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:21,688 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,690 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:21,690 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:21,696 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:21,696 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:21,697 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:21,697 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:28:21,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:21,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050618996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:21,716 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:21,716 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:21,716 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101615634] [2021-05-22 02:28:21,716 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:21,716 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:21,716 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:21,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:21,716 INFO L87 Difference]: Start difference. First operand 490 states and 1541 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:21,881 INFO L93 Difference]: Finished difference Result 615 states and 1900 transitions. [2021-05-22 02:28:21,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:21,881 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:21,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:21,882 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:28:21,882 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:28:21,882 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 122.5ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:21,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:28:21,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 488. [2021-05-22 02:28:21,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.154004106776181) internal successors, (1536), 487 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1536 transitions. [2021-05-22 02:28:21,887 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1536 transitions. Word has length 21 [2021-05-22 02:28:21,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:21,887 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1536 transitions. [2021-05-22 02:28:21,887 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:21,887 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1536 transitions. [2021-05-22 02:28:21,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:21,888 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:21,888 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:22,088 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2887,586 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:22,089 INFO L430 AbstractCegarLoop]: === Iteration 598 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:22,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:22,089 INFO L82 PathProgramCache]: Analyzing trace with hash 950479557, now seen corresponding path program 586 times [2021-05-22 02:28:22,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:22,089 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528773802] [2021-05-22 02:28:22,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:22,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:22,178 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:22,178 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:22,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528773802] [2021-05-22 02:28:22,178 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528773802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:22,178 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1502562827] [2021-05-22 02:28:22,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 587 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 587 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:22,203 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:22,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:22,203 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:22,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:22,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:22,246 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:22,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:22,249 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:22,257 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:22,258 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:22,258 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:22,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:22,309 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:22,316 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:22,316 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:22,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:22,319 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:22,325 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:22,325 INFO L518 ElimStorePlain]: Eliminatee v_prenex_137 vanished before elimination [2021-05-22 02:28:22,325 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:22,325 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:22,343 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:22,343 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1502562827] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:22,343 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:22,343 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:22,343 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026690210] [2021-05-22 02:28:22,343 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:22,343 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:22,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:22,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:22,343 INFO L87 Difference]: Start difference. First operand 488 states and 1536 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:22,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:22,506 INFO L93 Difference]: Finished difference Result 661 states and 2050 transitions. [2021-05-22 02:28:22,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:22,506 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:22,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:22,507 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:28:22,507 INFO L226 Difference]: Without dead ends: 632 [2021-05-22 02:28:22,507 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 133.3ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:22,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-22 02:28:22,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 488. [2021-05-22 02:28:22,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.154004106776181) internal successors, (1536), 487 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:22,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1536 transitions. [2021-05-22 02:28:22,515 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1536 transitions. Word has length 21 [2021-05-22 02:28:22,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:22,515 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1536 transitions. [2021-05-22 02:28:22,515 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:22,515 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1536 transitions. [2021-05-22 02:28:22,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:22,516 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:22,516 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:22,732 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2891,587 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:22,733 INFO L430 AbstractCegarLoop]: === Iteration 599 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:22,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:22,733 INFO L82 PathProgramCache]: Analyzing trace with hash -144219361, now seen corresponding path program 587 times [2021-05-22 02:28:22,733 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:22,733 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323568030] [2021-05-22 02:28:22,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:22,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:22,833 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:22,834 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:22,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323568030] [2021-05-22 02:28:22,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323568030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:22,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569753460] [2021-05-22 02:28:22,834 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 588 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 588 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:22,858 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:22,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:22,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:22,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:22,909 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:22,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:22,910 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:22,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:22,922 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:22,922 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:28:23,015 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:23,015 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:23,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:23,016 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:23,019 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:23,039 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:23,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:23,040 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,057 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:23,058 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:23,058 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:28:23,108 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:23,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1569753460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:23,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:23,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:23,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49440150] [2021-05-22 02:28:23,108 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:23,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:23,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:23,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:23,109 INFO L87 Difference]: Start difference. First operand 488 states and 1536 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:23,387 INFO L93 Difference]: Finished difference Result 836 states and 2559 transitions. [2021-05-22 02:28:23,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:28:23,387 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:23,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:23,388 INFO L225 Difference]: With dead ends: 836 [2021-05-22 02:28:23,388 INFO L226 Difference]: Without dead ends: 782 [2021-05-22 02:28:23,389 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 259.7ms TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:28:23,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 782 states. [2021-05-22 02:28:23,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 782 to 489. [2021-05-22 02:28:23,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1741803278688523) internal successors, (1549), 488 states have internal predecessors, (1549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1549 transitions. [2021-05-22 02:28:23,396 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1549 transitions. Word has length 21 [2021-05-22 02:28:23,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:23,396 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1549 transitions. [2021-05-22 02:28:23,396 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,396 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1549 transitions. [2021-05-22 02:28:23,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:23,397 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:23,397 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:23,597 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2900,588 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:23,597 INFO L430 AbstractCegarLoop]: === Iteration 600 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:23,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:23,597 INFO L82 PathProgramCache]: Analyzing trace with hash -768505125, now seen corresponding path program 588 times [2021-05-22 02:28:23,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:23,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674327076] [2021-05-22 02:28:23,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:23,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:23,686 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:23,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:23,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674327076] [2021-05-22 02:28:23,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674327076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:23,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504093912] [2021-05-22 02:28:23,686 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 589 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 589 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:23,711 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:23,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:23,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:23,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:23,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:23,755 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:23,758 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,766 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:23,767 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:23,767 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:23,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:23,795 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,806 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:23,806 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:23,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:23,808 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:23,817 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:23,817 INFO L518 ElimStorePlain]: Eliminatee v_prenex_139 vanished before elimination [2021-05-22 02:28:23,817 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:23,818 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:23,845 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:23,846 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504093912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:23,846 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:23,846 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:28:23,846 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455534595] [2021-05-22 02:28:23,846 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:28:23,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:23,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:28:23,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:23,846 INFO L87 Difference]: Start difference. First operand 489 states and 1549 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:23,963 INFO L93 Difference]: Finished difference Result 665 states and 2066 transitions. [2021-05-22 02:28:23,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:23,964 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:23,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:23,964 INFO L225 Difference]: With dead ends: 665 [2021-05-22 02:28:23,964 INFO L226 Difference]: Without dead ends: 636 [2021-05-22 02:28:23,964 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 119.7ms TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:23,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-05-22 02:28:23,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 489. [2021-05-22 02:28:23,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1741803278688523) internal successors, (1549), 488 states have internal predecessors, (1549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1549 transitions. [2021-05-22 02:28:23,969 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1549 transitions. Word has length 21 [2021-05-22 02:28:23,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:23,970 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1549 transitions. [2021-05-22 02:28:23,970 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:23,970 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1549 transitions. [2021-05-22 02:28:23,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:23,970 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:23,970 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:24,170 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2913,589 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:24,171 INFO L430 AbstractCegarLoop]: === Iteration 601 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:24,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:24,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1759833337, now seen corresponding path program 589 times [2021-05-22 02:28:24,171 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:24,171 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736937771] [2021-05-22 02:28:24,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:24,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:24,278 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:24,278 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:24,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736937771] [2021-05-22 02:28:24,278 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736937771] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:24,278 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438497335] [2021-05-22 02:28:24,278 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 590 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 590 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:24,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:24,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:24,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:24,353 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:24,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:24,355 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:24,364 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:24,367 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:24,367 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:28:24,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:24,412 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:24,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:24,413 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:24,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:24,415 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:24,438 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:24,440 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:24,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:24,441 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:24,462 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:24,463 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:24,463 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:81, output treesize:19 [2021-05-22 02:28:24,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:24,539 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438497335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:24,539 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:24,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:24,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1673322011] [2021-05-22 02:28:24,539 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:24,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:24,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:24,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:24,540 INFO L87 Difference]: Start difference. First operand 489 states and 1549 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:24,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:24,762 INFO L93 Difference]: Finished difference Result 739 states and 2271 transitions. [2021-05-22 02:28:24,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:24,763 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:24,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:24,764 INFO L225 Difference]: With dead ends: 739 [2021-05-22 02:28:24,764 INFO L226 Difference]: Without dead ends: 712 [2021-05-22 02:28:24,764 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 235.6ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:24,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 712 states. [2021-05-22 02:28:24,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 712 to 484. [2021-05-22 02:28:24,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:24,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:24,769 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:24,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:24,769 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:24,769 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:24,769 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:24,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:24,770 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:24,770 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:24,970 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 590 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2919 [2021-05-22 02:28:24,971 INFO L430 AbstractCegarLoop]: === Iteration 602 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:24,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:24,971 INFO L82 PathProgramCache]: Analyzing trace with hash 627882053, now seen corresponding path program 590 times [2021-05-22 02:28:24,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:24,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588326347] [2021-05-22 02:28:24,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:24,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:25,057 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:25,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:25,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588326347] [2021-05-22 02:28:25,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588326347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:25,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1274193555] [2021-05-22 02:28:25,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 591 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 591 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:25,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:25,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:25,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:25,083 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:25,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:25,128 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:25,130 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:25,139 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:25,139 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:25,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:25,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,180 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:25,181 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:25,181 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,181 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:25,194 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:25,194 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1274193555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:25,194 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:25,194 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:25,195 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090657629] [2021-05-22 02:28:25,195 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:25,195 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:25,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:25,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:25,195 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:25,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:25,375 INFO L93 Difference]: Finished difference Result 632 states and 1957 transitions. [2021-05-22 02:28:25,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:25,375 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:25,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:25,376 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:28:25,376 INFO L226 Difference]: Without dead ends: 610 [2021-05-22 02:28:25,376 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 160.8ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:25,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-22 02:28:25,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 484. [2021-05-22 02:28:25,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:25,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:25,381 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:25,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:25,381 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:25,381 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:25,381 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:25,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:25,382 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:25,382 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:25,582 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2929,591 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:25,582 INFO L430 AbstractCegarLoop]: === Iteration 603 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:25,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:25,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1617127597, now seen corresponding path program 591 times [2021-05-22 02:28:25,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:25,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1844651954] [2021-05-22 02:28:25,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:25,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:25,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:25,667 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:25,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1844651954] [2021-05-22 02:28:25,667 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1844651954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:25,667 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [843938929] [2021-05-22 02:28:25,667 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 592 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 592 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:25,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:28:25,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:25,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:25,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:25,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:25,736 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:25,738 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:25,747 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:25,747 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:25,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:25,773 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,783 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:25,783 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:28:25,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:25,786 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:25,794 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:25,794 INFO L518 ElimStorePlain]: Eliminatee v_prenex_141 vanished before elimination [2021-05-22 02:28:25,794 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:25,794 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:25,816 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:25,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [843938929] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:25,817 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:25,817 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:28:25,817 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631097761] [2021-05-22 02:28:25,817 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:28:25,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:25,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:28:25,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:25,817 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:26,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:26,004 INFO L93 Difference]: Finished difference Result 647 states and 2006 transitions. [2021-05-22 02:28:26,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:26,004 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:26,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:26,005 INFO L225 Difference]: With dead ends: 647 [2021-05-22 02:28:26,005 INFO L226 Difference]: Without dead ends: 618 [2021-05-22 02:28:26,005 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 142.2ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:26,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 618 states. [2021-05-22 02:28:26,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 618 to 484. [2021-05-22 02:28:26,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:26,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:26,010 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:26,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:26,010 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:26,010 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:26,010 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:26,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:26,011 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:26,011 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:26,211 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 592 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2933 [2021-05-22 02:28:26,211 INFO L430 AbstractCegarLoop]: === Iteration 604 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:26,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:26,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1319861187, now seen corresponding path program 592 times [2021-05-22 02:28:26,211 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:26,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879526750] [2021-05-22 02:28:26,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:26,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:26,312 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:26,313 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:26,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879526750] [2021-05-22 02:28:26,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1879526750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:26,313 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838733091] [2021-05-22 02:28:26,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 593 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 593 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:26,337 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:26,337 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:26,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:26,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:26,386 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:26,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:26,387 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:26,395 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:26,397 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:26,397 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:28:26,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:26,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:26,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:26,445 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:26,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:26,448 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:26,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:26,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:26,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:26,468 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:26,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:26,486 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:26,486 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:28:26,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:26,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838733091] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:26,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:26,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:26,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020000901] [2021-05-22 02:28:26,560 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:26,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:26,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:26,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:26,560 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:27,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:27,395 INFO L93 Difference]: Finished difference Result 883 states and 2715 transitions. [2021-05-22 02:28:27,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:28:27,396 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:27,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:27,397 INFO L225 Difference]: With dead ends: 883 [2021-05-22 02:28:27,397 INFO L226 Difference]: Without dead ends: 860 [2021-05-22 02:28:27,397 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 243 ImplicationChecksByTransitivity, 560.5ms TimeCoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:28:27,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 860 states. [2021-05-22 02:28:27,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 860 to 483. [2021-05-22 02:28:27,403 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1618257261410787) internal successors, (1524), 482 states have internal predecessors, (1524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:27,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1524 transitions. [2021-05-22 02:28:27,403 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1524 transitions. Word has length 21 [2021-05-22 02:28:27,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:27,403 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1524 transitions. [2021-05-22 02:28:27,403 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:27,404 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1524 transitions. [2021-05-22 02:28:27,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:27,404 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:27,404 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:27,604 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2939,593 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:27,604 INFO L430 AbstractCegarLoop]: === Iteration 605 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:27,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:27,605 INFO L82 PathProgramCache]: Analyzing trace with hash -1604123871, now seen corresponding path program 593 times [2021-05-22 02:28:27,605 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:27,605 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470880709] [2021-05-22 02:28:27,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:27,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:27,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:27,708 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:27,708 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470880709] [2021-05-22 02:28:27,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [470880709] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:27,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753779275] [2021-05-22 02:28:27,709 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 594 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 594 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:27,733 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:27,733 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:27,734 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:27,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:27,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:27,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:27,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:27,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:27,815 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:27,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:27,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:27,834 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:28:27,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:27,885 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:27,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:27,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:27,888 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:27,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:27,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:27,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:27,907 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:27,922 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:27,923 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:27,923 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:28:27,999 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:27,999 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [753779275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:28,000 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:28,000 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:28,000 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786694573] [2021-05-22 02:28:28,000 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:28,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:28,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:28,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:28,000 INFO L87 Difference]: Start difference. First operand 483 states and 1524 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:28,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:28,230 INFO L93 Difference]: Finished difference Result 714 states and 2190 transitions. [2021-05-22 02:28:28,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:28,230 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:28,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:28,231 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:28:28,231 INFO L226 Difference]: Without dead ends: 687 [2021-05-22 02:28:28,231 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 280.6ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:28:28,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 687 states. [2021-05-22 02:28:28,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 687 to 494. [2021-05-22 02:28:28,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 494 states, 493 states have (on average 3.1643002028397564) internal successors, (1560), 493 states have internal predecessors, (1560), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:28,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 494 states to 494 states and 1560 transitions. [2021-05-22 02:28:28,237 INFO L78 Accepts]: Start accepts. Automaton has 494 states and 1560 transitions. Word has length 21 [2021-05-22 02:28:28,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:28,237 INFO L482 AbstractCegarLoop]: Abstraction has 494 states and 1560 transitions. [2021-05-22 02:28:28,237 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:28,237 INFO L276 IsEmpty]: Start isEmpty. Operand 494 states and 1560 transitions. [2021-05-22 02:28:28,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:28,238 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:28,238 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:28,438 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2948,594 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:28,438 INFO L430 AbstractCegarLoop]: === Iteration 606 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:28,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:28,438 INFO L82 PathProgramCache]: Analyzing trace with hash 471565919, now seen corresponding path program 594 times [2021-05-22 02:28:28,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:28,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1163057433] [2021-05-22 02:28:28,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:28,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:28,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:28,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:28,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1163057433] [2021-05-22 02:28:28,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1163057433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:28,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997102390] [2021-05-22 02:28:28,536 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 595 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 595 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:28,560 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:28:28,560 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:28,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:28,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:28,622 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:28,622 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:28,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:28,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:28,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:28,626 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:28,644 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:28,645 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:28,645 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:28:28,707 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:28,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:28,708 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:28,716 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:28,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:28,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:28,719 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:28,727 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:28,727 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:28,727 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:10 [2021-05-22 02:28:28,774 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:28,774 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997102390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:28,774 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:28,774 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:28,774 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384825970] [2021-05-22 02:28:28,774 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:28,774 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:28,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:28,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:28,775 INFO L87 Difference]: Start difference. First operand 494 states and 1560 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:28,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:28,998 INFO L93 Difference]: Finished difference Result 663 states and 2046 transitions. [2021-05-22 02:28:28,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:28:28,999 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:28,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:29,000 INFO L225 Difference]: With dead ends: 663 [2021-05-22 02:28:29,000 INFO L226 Difference]: Without dead ends: 642 [2021-05-22 02:28:29,000 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 234.8ms TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:29,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 642 states. [2021-05-22 02:28:29,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 642 to 476. [2021-05-22 02:28:29,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.143157894736842) internal successors, (1493), 475 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:29,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1493 transitions. [2021-05-22 02:28:29,005 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1493 transitions. Word has length 21 [2021-05-22 02:28:29,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:29,005 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1493 transitions. [2021-05-22 02:28:29,005 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:29,005 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1493 transitions. [2021-05-22 02:28:29,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:29,006 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:29,006 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:29,206 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 595 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2961 [2021-05-22 02:28:29,206 INFO L430 AbstractCegarLoop]: === Iteration 607 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:29,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:29,207 INFO L82 PathProgramCache]: Analyzing trace with hash 13787909, now seen corresponding path program 595 times [2021-05-22 02:28:29,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:29,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526167842] [2021-05-22 02:28:29,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:29,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:29,266 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:29,266 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:29,266 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526167842] [2021-05-22 02:28:29,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526167842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:29,267 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576748685] [2021-05-22 02:28:29,267 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 596 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 596 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:29,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:29,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:29,292 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:29,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:29,314 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:29,317 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,323 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:29,324 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:29,324 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:29,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:29,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:29,349 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:29,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,349 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:29,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:29,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576748685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:29,357 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:29,357 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:29,357 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644383884] [2021-05-22 02:28:29,358 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:29,358 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:29,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:29,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:29,358 INFO L87 Difference]: Start difference. First operand 476 states and 1493 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:29,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:29,474 INFO L93 Difference]: Finished difference Result 741 states and 2254 transitions. [2021-05-22 02:28:29,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:29,474 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:29,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:29,475 INFO L225 Difference]: With dead ends: 741 [2021-05-22 02:28:29,475 INFO L226 Difference]: Without dead ends: 719 [2021-05-22 02:28:29,476 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 78.6ms TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:29,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 719 states. [2021-05-22 02:28:29,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 719 to 482. [2021-05-22 02:28:29,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1434511434511436) internal successors, (1512), 481 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:29,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1512 transitions. [2021-05-22 02:28:29,481 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1512 transitions. Word has length 21 [2021-05-22 02:28:29,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:29,481 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1512 transitions. [2021-05-22 02:28:29,481 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:29,481 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1512 transitions. [2021-05-22 02:28:29,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:29,482 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:29,482 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:29,687 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2966,596 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:29,688 INFO L430 AbstractCegarLoop]: === Iteration 608 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:29,688 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:29,688 INFO L82 PathProgramCache]: Analyzing trace with hash -2076000913, now seen corresponding path program 596 times [2021-05-22 02:28:29,688 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:29,688 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565658063] [2021-05-22 02:28:29,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:29,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:29,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:29,762 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:29,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565658063] [2021-05-22 02:28:29,762 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565658063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:29,762 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625109168] [2021-05-22 02:28:29,762 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 597 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 597 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:29,786 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:29,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:29,787 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:29,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:29,822 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:29,823 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:29,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:29,824 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:29,826 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,837 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:29,839 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:29,839 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:29 [2021-05-22 02:28:29,937 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:28:29,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:29,939 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,944 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:29,945 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:29,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:29,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,950 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:29,951 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:29,951 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:28:29,977 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:29,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [625109168] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:29,977 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:29,977 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:29,977 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381612700] [2021-05-22 02:28:29,977 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:29,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:29,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:29,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:29,977 INFO L87 Difference]: Start difference. First operand 482 states and 1512 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:30,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:30,522 INFO L93 Difference]: Finished difference Result 921 states and 2800 transitions. [2021-05-22 02:28:30,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:28:30,522 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:30,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:30,524 INFO L225 Difference]: With dead ends: 921 [2021-05-22 02:28:30,524 INFO L226 Difference]: Without dead ends: 902 [2021-05-22 02:28:30,524 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 238 ImplicationChecksByTransitivity, 428.4ms TimeCoverageRelationStatistics Valid=189, Invalid=867, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:28:30,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 902 states. [2021-05-22 02:28:30,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 902 to 487. [2021-05-22 02:28:30,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1502057613168724) internal successors, (1531), 486 states have internal predecessors, (1531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:30,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1531 transitions. [2021-05-22 02:28:30,530 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1531 transitions. Word has length 21 [2021-05-22 02:28:30,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:30,530 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1531 transitions. [2021-05-22 02:28:30,530 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:30,530 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1531 transitions. [2021-05-22 02:28:30,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:30,531 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:30,531 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:30,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 597 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2969 [2021-05-22 02:28:30,731 INFO L430 AbstractCegarLoop]: === Iteration 609 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:30,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:30,732 INFO L82 PathProgramCache]: Analyzing trace with hash -1119235791, now seen corresponding path program 597 times [2021-05-22 02:28:30,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:30,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877915289] [2021-05-22 02:28:30,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:30,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:30,810 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:30,810 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:30,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877915289] [2021-05-22 02:28:30,810 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877915289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:30,810 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47342297] [2021-05-22 02:28:30,810 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 598 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 598 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:30,835 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:30,835 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:30,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:30,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:30,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:30,854 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:30,862 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:30,863 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:30,863 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:30,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:30,934 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:30,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:30,936 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:30,939 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:30,939 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:30,939 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:30,939 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:28:30,963 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:30,964 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47342297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:30,964 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:30,964 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:30,964 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843644197] [2021-05-22 02:28:30,964 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:30,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:30,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:30,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:30,964 INFO L87 Difference]: Start difference. First operand 487 states and 1531 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:31,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:31,215 INFO L93 Difference]: Finished difference Result 818 states and 2508 transitions. [2021-05-22 02:28:31,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:31,215 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:31,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:31,216 INFO L225 Difference]: With dead ends: 818 [2021-05-22 02:28:31,216 INFO L226 Difference]: Without dead ends: 779 [2021-05-22 02:28:31,216 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 219.1ms TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:28:31,217 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 779 states. [2021-05-22 02:28:31,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 779 to 487. [2021-05-22 02:28:31,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.139917695473251) internal successors, (1526), 486 states have internal predecessors, (1526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:31,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1526 transitions. [2021-05-22 02:28:31,222 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1526 transitions. Word has length 21 [2021-05-22 02:28:31,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:31,222 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1526 transitions. [2021-05-22 02:28:31,222 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:31,222 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1526 transitions. [2021-05-22 02:28:31,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:31,223 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:31,223 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:31,423 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2976,598 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:31,423 INFO L430 AbstractCegarLoop]: === Iteration 610 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:31,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:31,423 INFO L82 PathProgramCache]: Analyzing trace with hash 276266191, now seen corresponding path program 598 times [2021-05-22 02:28:31,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:31,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471624355] [2021-05-22 02:28:31,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:31,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:31,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:31,503 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:31,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471624355] [2021-05-22 02:28:31,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1471624355] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:31,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244601322] [2021-05-22 02:28:31,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 599 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 599 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:31,528 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:31,529 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:31,529 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:31,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:31,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:31,550 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:31,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:31,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:31,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:31,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:31,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:31,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:31,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:31,623 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:31,623 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:31,623 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:31,624 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:28:31,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:31,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244601322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:31,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:31,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:31,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150918562] [2021-05-22 02:28:31,648 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:31,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:31,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:31,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:31,648 INFO L87 Difference]: Start difference. First operand 487 states and 1526 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:32,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:32,103 INFO L93 Difference]: Finished difference Result 906 states and 2775 transitions. [2021-05-22 02:28:32,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:28:32,104 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:32,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:32,105 INFO L225 Difference]: With dead ends: 906 [2021-05-22 02:28:32,105 INFO L226 Difference]: Without dead ends: 887 [2021-05-22 02:28:32,105 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 298.7ms TimeCoverageRelationStatistics Valid=130, Invalid=572, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:28:32,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2021-05-22 02:28:32,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 493. [2021-05-22 02:28:32,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1463414634146343) internal successors, (1548), 492 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:32,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1548 transitions. [2021-05-22 02:28:32,111 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1548 transitions. Word has length 21 [2021-05-22 02:28:32,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:32,111 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1548 transitions. [2021-05-22 02:28:32,112 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:32,112 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1548 transitions. [2021-05-22 02:28:32,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:32,112 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:32,112 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:32,312 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2979,599 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:32,313 INFO L430 AbstractCegarLoop]: === Iteration 611 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:32,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:32,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1962658031, now seen corresponding path program 599 times [2021-05-22 02:28:32,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:32,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1278978275] [2021-05-22 02:28:32,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:32,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:32,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:32,391 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:32,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1278978275] [2021-05-22 02:28:32,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1278978275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:32,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166931401] [2021-05-22 02:28:32,391 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 600 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 600 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:32,415 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:32,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:32,416 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:28:32,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:32,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:32,437 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,439 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:32,440 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:32,443 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:32,445 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:32,466 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:28:32,466 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:89, output treesize:57 [2021-05-22 02:28:32,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:32,550 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:28:32,552 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:32,554 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:32,565 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:32,565 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:32,565 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:28:32,565 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:69, output treesize:26 [2021-05-22 02:28:32,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:32,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166931401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:32,632 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:32,632 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:32,632 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228606882] [2021-05-22 02:28:32,632 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:32,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:32,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:32,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:32,632 INFO L87 Difference]: Start difference. First operand 493 states and 1548 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:33,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:33,647 INFO L93 Difference]: Finished difference Result 1112 states and 3401 transitions. [2021-05-22 02:28:33,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-22 02:28:33,647 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:33,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:33,648 INFO L225 Difference]: With dead ends: 1112 [2021-05-22 02:28:33,649 INFO L226 Difference]: Without dead ends: 1066 [2021-05-22 02:28:33,649 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 785.8ms TimeCoverageRelationStatistics Valid=208, Invalid=982, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:28:33,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2021-05-22 02:28:33,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 499. [2021-05-22 02:28:33,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 3.1646586345381524) internal successors, (1576), 498 states have internal predecessors, (1576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:33,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 1576 transitions. [2021-05-22 02:28:33,660 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 1576 transitions. Word has length 21 [2021-05-22 02:28:33,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:33,660 INFO L482 AbstractCegarLoop]: Abstraction has 499 states and 1576 transitions. [2021-05-22 02:28:33,660 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:33,660 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 1576 transitions. [2021-05-22 02:28:33,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:33,661 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:33,661 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:33,861 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 600 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2985 [2021-05-22 02:28:33,862 INFO L430 AbstractCegarLoop]: === Iteration 612 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:33,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:33,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1668348405, now seen corresponding path program 600 times [2021-05-22 02:28:33,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:33,862 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1217729016] [2021-05-22 02:28:33,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:33,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:33,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:33,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:33,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1217729016] [2021-05-22 02:28:33,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1217729016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:33,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108798681] [2021-05-22 02:28:33,927 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 601 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 601 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:33,952 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:33,952 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:33,953 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:33,953 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:33,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:33,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:33,976 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:33,977 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:33,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:33,983 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:33,983 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:34,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:34,006 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,009 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:34,009 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:34,009 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,009 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:34,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:34,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108798681] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:34,017 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:34,017 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:34,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102172904] [2021-05-22 02:28:34,017 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:34,017 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:34,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:34,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:34,018 INFO L87 Difference]: Start difference. First operand 499 states and 1576 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:34,194 INFO L93 Difference]: Finished difference Result 764 states and 2361 transitions. [2021-05-22 02:28:34,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:34,195 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:34,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:34,196 INFO L225 Difference]: With dead ends: 764 [2021-05-22 02:28:34,196 INFO L226 Difference]: Without dead ends: 742 [2021-05-22 02:28:34,196 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 100.5ms TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:34,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-22 02:28:34,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 502. [2021-05-22 02:28:34,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.161676646706587) internal successors, (1584), 501 states have internal predecessors, (1584), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1584 transitions. [2021-05-22 02:28:34,201 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1584 transitions. Word has length 21 [2021-05-22 02:28:34,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:34,201 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1584 transitions. [2021-05-22 02:28:34,201 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,202 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1584 transitions. [2021-05-22 02:28:34,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:34,202 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:34,202 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:34,402 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 601 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2994 [2021-05-22 02:28:34,403 INFO L430 AbstractCegarLoop]: === Iteration 613 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:34,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:34,403 INFO L82 PathProgramCache]: Analyzing trace with hash 212404533, now seen corresponding path program 601 times [2021-05-22 02:28:34,403 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:34,403 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070995456] [2021-05-22 02:28:34,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:34,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:34,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:34,472 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:34,472 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070995456] [2021-05-22 02:28:34,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1070995456] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:34,473 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696808083] [2021-05-22 02:28:34,473 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 602 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 602 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:34,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:34,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:34,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:34,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:34,519 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:34,521 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,528 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:34,528 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:34,528 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:34,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:34,551 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:34,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:34,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:34,559 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:34,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:34,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:34,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:34,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696808083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:34,576 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:34,576 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:34,576 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271450664] [2021-05-22 02:28:34,577 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:34,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:34,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:34,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:34,577 INFO L87 Difference]: Start difference. First operand 502 states and 1584 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:34,730 INFO L93 Difference]: Finished difference Result 765 states and 2356 transitions. [2021-05-22 02:28:34,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:34,730 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:34,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:34,731 INFO L225 Difference]: With dead ends: 765 [2021-05-22 02:28:34,731 INFO L226 Difference]: Without dead ends: 736 [2021-05-22 02:28:34,731 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 110.6ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:34,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 736 states. [2021-05-22 02:28:34,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 736 to 493. [2021-05-22 02:28:34,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.154471544715447) internal successors, (1552), 492 states have internal predecessors, (1552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1552 transitions. [2021-05-22 02:28:34,737 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1552 transitions. Word has length 21 [2021-05-22 02:28:34,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:34,737 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1552 transitions. [2021-05-22 02:28:34,737 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:34,737 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1552 transitions. [2021-05-22 02:28:34,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:34,738 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:34,738 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:34,938 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2998,602 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:34,938 INFO L430 AbstractCegarLoop]: === Iteration 614 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:34,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:34,938 INFO L82 PathProgramCache]: Analyzing trace with hash 838275325, now seen corresponding path program 602 times [2021-05-22 02:28:34,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:34,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376849980] [2021-05-22 02:28:34,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:34,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:35,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:35,010 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:35,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376849980] [2021-05-22 02:28:35,010 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376849980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:35,010 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1130957655] [2021-05-22 02:28:35,010 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 603 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 603 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:35,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:35,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:35,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:35,035 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:35,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:35,068 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:35,070 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:35,070 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:35,071 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:28:35,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:35,108 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:35,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:35,110 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:35,110 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:35,110 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:28:35,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:35,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1130957655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:35,134 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:35,134 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:35,134 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670223463] [2021-05-22 02:28:35,134 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:35,134 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:35,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:35,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:35,135 INFO L87 Difference]: Start difference. First operand 493 states and 1552 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:35,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:35,702 INFO L93 Difference]: Finished difference Result 895 states and 2732 transitions. [2021-05-22 02:28:35,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:28:35,703 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:35,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:35,704 INFO L225 Difference]: With dead ends: 895 [2021-05-22 02:28:35,704 INFO L226 Difference]: Without dead ends: 872 [2021-05-22 02:28:35,704 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 267 ImplicationChecksByTransitivity, 470.4ms TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:28:35,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 872 states. [2021-05-22 02:28:35,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 872 to 483. [2021-05-22 02:28:35,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.136929460580913) internal successors, (1512), 482 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:35,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1512 transitions. [2021-05-22 02:28:35,710 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1512 transitions. Word has length 21 [2021-05-22 02:28:35,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:35,710 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1512 transitions. [2021-05-22 02:28:35,710 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:35,710 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1512 transitions. [2021-05-22 02:28:35,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:35,711 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:35,711 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:35,911 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3003,603 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:35,911 INFO L430 AbstractCegarLoop]: === Iteration 615 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:35,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:35,912 INFO L82 PathProgramCache]: Analyzing trace with hash 1036891949, now seen corresponding path program 603 times [2021-05-22 02:28:35,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:35,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488006204] [2021-05-22 02:28:35,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:35,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:35,987 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:35,988 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:35,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488006204] [2021-05-22 02:28:35,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488006204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:35,988 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856397721] [2021-05-22 02:28:35,988 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 604 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 604 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:36,013 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:36,013 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:36,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:36,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:36,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:36,044 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:36,048 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,049 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:36,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:36,064 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,067 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:36,068 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:36,068 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,068 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:28:36,080 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:36,080 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856397721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:36,080 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:36,080 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:28:36,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337373457] [2021-05-22 02:28:36,080 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:28:36,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:36,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:28:36,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:28:36,081 INFO L87 Difference]: Start difference. First operand 483 states and 1512 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:36,181 INFO L93 Difference]: Finished difference Result 611 states and 1882 transitions. [2021-05-22 02:28:36,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:36,182 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:36,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:36,183 INFO L225 Difference]: With dead ends: 611 [2021-05-22 02:28:36,183 INFO L226 Difference]: Without dead ends: 592 [2021-05-22 02:28:36,183 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 95.6ms TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:28:36,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-22 02:28:36,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 479. [2021-05-22 02:28:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1380753138075312) internal successors, (1500), 478 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1500 transitions. [2021-05-22 02:28:36,188 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1500 transitions. Word has length 21 [2021-05-22 02:28:36,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:36,188 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1500 transitions. [2021-05-22 02:28:36,188 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,188 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1500 transitions. [2021-05-22 02:28:36,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:36,189 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:36,189 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:36,389 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3005,604 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:36,389 INFO L430 AbstractCegarLoop]: === Iteration 616 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:36,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:36,389 INFO L82 PathProgramCache]: Analyzing trace with hash 2145041413, now seen corresponding path program 604 times [2021-05-22 02:28:36,390 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:36,390 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [985560968] [2021-05-22 02:28:36,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:36,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:36,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:36,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:36,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [985560968] [2021-05-22 02:28:36,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [985560968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:36,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [460794526] [2021-05-22 02:28:36,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 605 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 605 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:36,494 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:36,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:36,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:36,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:36,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:36,527 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:36,529 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,535 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:36,536 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:36,536 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:36,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:36,548 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:36,550 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:36,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:36,551 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:36,559 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:36,559 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [460794526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:36,559 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:36,559 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:36,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155942363] [2021-05-22 02:28:36,559 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:36,559 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:36,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:36,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:36,559 INFO L87 Difference]: Start difference. First operand 479 states and 1500 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:36,700 INFO L93 Difference]: Finished difference Result 601 states and 1854 transitions. [2021-05-22 02:28:36,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:36,700 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:36,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:36,701 INFO L225 Difference]: With dead ends: 601 [2021-05-22 02:28:36,701 INFO L226 Difference]: Without dead ends: 579 [2021-05-22 02:28:36,701 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 83.3ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:28:36,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-05-22 02:28:36,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 486. [2021-05-22 02:28:36,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.1402061855670103) internal successors, (1523), 485 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1523 transitions. [2021-05-22 02:28:36,706 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:36,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:36,706 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1523 transitions. [2021-05-22 02:28:36,706 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:36,706 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1523 transitions. [2021-05-22 02:28:36,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:36,706 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:36,706 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:36,907 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3007,605 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:36,907 INFO L430 AbstractCegarLoop]: === Iteration 617 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:36,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:36,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1725853973, now seen corresponding path program 605 times [2021-05-22 02:28:36,907 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:36,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624619413] [2021-05-22 02:28:36,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:36,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:36,976 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:36,977 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:36,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624619413] [2021-05-22 02:28:36,977 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624619413] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:36,977 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714361734] [2021-05-22 02:28:36,977 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 606 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 606 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:37,002 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:37,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:37,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:37,003 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:37,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:37,036 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,040 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:37,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,040 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:37,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:37,072 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:37,074 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,076 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:37,076 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:37,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:37,077 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:28:37,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:37,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714361734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:37,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:37,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:37,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283895222] [2021-05-22 02:28:37,084 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:37,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:37,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:37,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:37,085 INFO L87 Difference]: Start difference. First operand 486 states and 1523 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:37,221 INFO L93 Difference]: Finished difference Result 614 states and 1892 transitions. [2021-05-22 02:28:37,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:37,221 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:37,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:37,222 INFO L225 Difference]: With dead ends: 614 [2021-05-22 02:28:37,222 INFO L226 Difference]: Without dead ends: 581 [2021-05-22 02:28:37,222 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 101.8ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:37,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-22 02:28:37,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 486. [2021-05-22 02:28:37,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.134020618556701) internal successors, (1520), 485 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1520 transitions. [2021-05-22 02:28:37,227 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1520 transitions. Word has length 21 [2021-05-22 02:28:37,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:37,227 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1520 transitions. [2021-05-22 02:28:37,227 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,227 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1520 transitions. [2021-05-22 02:28:37,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:37,228 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:37,228 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:37,428 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 606 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3010 [2021-05-22 02:28:37,428 INFO L430 AbstractCegarLoop]: === Iteration 618 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:37,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:37,429 INFO L82 PathProgramCache]: Analyzing trace with hash -269172945, now seen corresponding path program 606 times [2021-05-22 02:28:37,429 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:37,429 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822552348] [2021-05-22 02:28:37,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:37,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:37,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:37,499 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:37,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822552348] [2021-05-22 02:28:37,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822552348] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:37,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918888308] [2021-05-22 02:28:37,499 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 607 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 607 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:37,524 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:37,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:37,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:37,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:37,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:37,556 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:37,558 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,564 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:37,565 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:37,565 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:37,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:37,576 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:37,578 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:37,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:37,583 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:37,584 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:37,584 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:37,600 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:37,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918888308] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:37,600 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:37,600 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:28:37,600 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613405832] [2021-05-22 02:28:37,600 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:28:37,600 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:37,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:28:37,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:28:37,600 INFO L87 Difference]: Start difference. First operand 486 states and 1520 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:37,729 INFO L93 Difference]: Finished difference Result 641 states and 1983 transitions. [2021-05-22 02:28:37,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:37,729 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:37,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:37,730 INFO L225 Difference]: With dead ends: 641 [2021-05-22 02:28:37,730 INFO L226 Difference]: Without dead ends: 612 [2021-05-22 02:28:37,730 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 91.0ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:28:37,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2021-05-22 02:28:37,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 486. [2021-05-22 02:28:37,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.134020618556701) internal successors, (1520), 485 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1520 transitions. [2021-05-22 02:28:37,736 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1520 transitions. Word has length 21 [2021-05-22 02:28:37,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:37,736 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1520 transitions. [2021-05-22 02:28:37,736 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:37,736 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1520 transitions. [2021-05-22 02:28:37,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:37,736 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:37,736 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:37,937 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3013,607 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:37,937 INFO L430 AbstractCegarLoop]: === Iteration 619 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:37,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:37,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1363871863, now seen corresponding path program 607 times [2021-05-22 02:28:37,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:37,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1304703867] [2021-05-22 02:28:37,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:37,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:38,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:38,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:38,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1304703867] [2021-05-22 02:28:38,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1304703867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:38,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031792661] [2021-05-22 02:28:38,006 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 608 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 608 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:38,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:38,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:38,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:38,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:38,065 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,069 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:38,069 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,069 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:28:38,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:38,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:38,092 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,098 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:38,098 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:38,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:38,098 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:28:38,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:38,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1031792661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:38,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:38,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:38,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763054376] [2021-05-22 02:28:38,126 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:38,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:38,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:38,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:38,126 INFO L87 Difference]: Start difference. First operand 486 states and 1520 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:38,321 INFO L93 Difference]: Finished difference Result 601 states and 1858 transitions. [2021-05-22 02:28:38,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:38,321 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:38,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:38,322 INFO L225 Difference]: With dead ends: 601 [2021-05-22 02:28:38,322 INFO L226 Difference]: Without dead ends: 574 [2021-05-22 02:28:38,322 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 115.2ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:38,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-22 02:28:38,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 483. [2021-05-22 02:28:38,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.136929460580913) internal successors, (1512), 482 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1512 transitions. [2021-05-22 02:28:38,327 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1512 transitions. Word has length 21 [2021-05-22 02:28:38,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:38,327 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1512 transitions. [2021-05-22 02:28:38,327 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,327 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1512 transitions. [2021-05-22 02:28:38,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:38,328 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:38,328 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:38,528 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3017,608 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:38,528 INFO L430 AbstractCegarLoop]: === Iteration 620 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:38,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:38,528 INFO L82 PathProgramCache]: Analyzing trace with hash 1837611175, now seen corresponding path program 608 times [2021-05-22 02:28:38,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:38,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395209701] [2021-05-22 02:28:38,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:38,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:38,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:38,602 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:38,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395209701] [2021-05-22 02:28:38,602 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395209701] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:38,602 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479108533] [2021-05-22 02:28:38,602 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 609 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 609 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:38,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:38,627 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:38,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:38,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:38,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:38,655 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:38,659 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,659 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:28:38,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:28:38,679 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:28:38,681 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:38,687 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:38,687 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:38,688 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:38,688 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:38,704 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:38,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [479108533] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:38,704 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:38,704 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:28:38,704 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512432919] [2021-05-22 02:28:38,704 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:28:38,704 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:38,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:28:38,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:28:38,704 INFO L87 Difference]: Start difference. First operand 483 states and 1512 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:38,841 INFO L93 Difference]: Finished difference Result 615 states and 1894 transitions. [2021-05-22 02:28:38,841 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:38,841 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:38,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:38,842 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:28:38,842 INFO L226 Difference]: Without dead ends: 579 [2021-05-22 02:28:38,842 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 104.5ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:38,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-05-22 02:28:38,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 486. [2021-05-22 02:28:38,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.138144329896907) internal successors, (1522), 485 states have internal predecessors, (1522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1522 transitions. [2021-05-22 02:28:38,847 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1522 transitions. Word has length 21 [2021-05-22 02:28:38,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:38,847 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1522 transitions. [2021-05-22 02:28:38,847 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:38,847 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1522 transitions. [2021-05-22 02:28:38,848 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:38,848 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:38,848 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:39,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 609 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3023 [2021-05-22 02:28:39,048 INFO L430 AbstractCegarLoop]: === Iteration 621 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:39,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:39,048 INFO L82 PathProgramCache]: Analyzing trace with hash 742912257, now seen corresponding path program 609 times [2021-05-22 02:28:39,049 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:39,049 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [935729628] [2021-05-22 02:28:39,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:39,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:39,118 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:39,119 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:39,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [935729628] [2021-05-22 02:28:39,119 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [935729628] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:39,119 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [749944579] [2021-05-22 02:28:39,119 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 610 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 610 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:39,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:39,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:39,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:39,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:39,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:39,197 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:39,200 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:39,206 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:39,206 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:39,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:39,230 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,237 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:39,237 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:39,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:39,239 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,245 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:39,245 INFO L518 ElimStorePlain]: Eliminatee v_prenex_143 vanished before elimination [2021-05-22 02:28:39,246 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:39,246 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:28:39,273 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:39,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [749944579] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:39,273 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:39,273 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:39,273 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780773135] [2021-05-22 02:28:39,273 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:39,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:39,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:39,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:39,274 INFO L87 Difference]: Start difference. First operand 486 states and 1522 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:39,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:39,476 INFO L93 Difference]: Finished difference Result 656 states and 2011 transitions. [2021-05-22 02:28:39,477 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:28:39,477 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:39,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:39,478 INFO L225 Difference]: With dead ends: 656 [2021-05-22 02:28:39,478 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:28:39,478 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 155.0ms TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:39,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:28:39,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 502. [2021-05-22 02:28:39,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 502 states, 501 states have (on average 3.1397205588822357) internal successors, (1573), 501 states have internal predecessors, (1573), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:39,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 502 states to 502 states and 1573 transitions. [2021-05-22 02:28:39,483 INFO L78 Accepts]: Start accepts. Automaton has 502 states and 1573 transitions. Word has length 21 [2021-05-22 02:28:39,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:39,483 INFO L482 AbstractCegarLoop]: Abstraction has 502 states and 1573 transitions. [2021-05-22 02:28:39,483 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:39,483 INFO L276 IsEmpty]: Start isEmpty. Operand 502 states and 1573 transitions. [2021-05-22 02:28:39,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:39,484 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:39,484 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:39,684 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3026,610 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:39,684 INFO L430 AbstractCegarLoop]: === Iteration 622 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:39,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:39,685 INFO L82 PathProgramCache]: Analyzing trace with hash -1671302101, now seen corresponding path program 610 times [2021-05-22 02:28:39,685 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:39,685 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [526571640] [2021-05-22 02:28:39,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:39,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:39,756 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:39,756 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:39,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [526571640] [2021-05-22 02:28:39,756 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [526571640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:39,756 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2011126625] [2021-05-22 02:28:39,756 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 611 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 611 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:39,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:39,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:39,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:39,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:39,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:39,821 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:39,823 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,830 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:39,830 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:39,830 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:28:39,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:39,862 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:39,864 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:39,865 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:39,865 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:28:39,875 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:39,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2011126625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:39,875 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:39,875 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:39,875 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807119814] [2021-05-22 02:28:39,875 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:39,875 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:39,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:39,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:39,875 INFO L87 Difference]: Start difference. First operand 502 states and 1573 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:40,057 INFO L93 Difference]: Finished difference Result 606 states and 1858 transitions. [2021-05-22 02:28:40,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:40,057 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:40,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:40,058 INFO L225 Difference]: With dead ends: 606 [2021-05-22 02:28:40,058 INFO L226 Difference]: Without dead ends: 585 [2021-05-22 02:28:40,058 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 140.0ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:40,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 585 states. [2021-05-22 02:28:40,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 585 to 483. [2021-05-22 02:28:40,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1493775933609958) internal successors, (1518), 482 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1518 transitions. [2021-05-22 02:28:40,063 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1518 transitions. Word has length 21 [2021-05-22 02:28:40,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:40,063 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1518 transitions. [2021-05-22 02:28:40,064 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,064 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1518 transitions. [2021-05-22 02:28:40,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:40,064 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:40,064 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:40,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 611 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3034 [2021-05-22 02:28:40,265 INFO L430 AbstractCegarLoop]: === Iteration 623 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:40,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:40,265 INFO L82 PathProgramCache]: Analyzing trace with hash -1889309011, now seen corresponding path program 611 times [2021-05-22 02:28:40,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:40,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1000434215] [2021-05-22 02:28:40,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:40,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:40,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:40,347 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:40,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1000434215] [2021-05-22 02:28:40,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1000434215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:40,347 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [675336957] [2021-05-22 02:28:40,347 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 612 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 612 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:40,372 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:40,372 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:40,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:40,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:40,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:40,412 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:40,414 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,423 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:40,424 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:40,424 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:40,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:40,474 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:40,477 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:40,477 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,477 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:28:40,485 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:40,485 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [675336957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:40,485 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:40,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:40,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846349764] [2021-05-22 02:28:40,486 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:40,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:40,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:40,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:40,486 INFO L87 Difference]: Start difference. First operand 483 states and 1518 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:40,633 INFO L93 Difference]: Finished difference Result 634 states and 1951 transitions. [2021-05-22 02:28:40,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:40,633 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:40,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:40,634 INFO L225 Difference]: With dead ends: 634 [2021-05-22 02:28:40,634 INFO L226 Difference]: Without dead ends: 612 [2021-05-22 02:28:40,634 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 127.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:40,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2021-05-22 02:28:40,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 490. [2021-05-22 02:28:40,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.1615541922290387) internal successors, (1546), 489 states have internal predecessors, (1546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1546 transitions. [2021-05-22 02:28:40,639 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1546 transitions. Word has length 21 [2021-05-22 02:28:40,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:40,639 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1546 transitions. [2021-05-22 02:28:40,639 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:40,640 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1546 transitions. [2021-05-22 02:28:40,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:40,640 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:40,640 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:40,840 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 612 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3037 [2021-05-22 02:28:40,841 INFO L430 AbstractCegarLoop]: === Iteration 624 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:40,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:40,841 INFO L82 PathProgramCache]: Analyzing trace with hash 1903866949, now seen corresponding path program 612 times [2021-05-22 02:28:40,841 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:40,841 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788228767] [2021-05-22 02:28:40,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:40,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:40,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:40,918 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:40,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788228767] [2021-05-22 02:28:40,918 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1788228767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:40,918 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497364283] [2021-05-22 02:28:40,918 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 613 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 613 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:40,942 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:28:40,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:40,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:40,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:40,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:40,982 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:40,985 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:40,993 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:40,994 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:40,994 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:41,029 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:41,030 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:41,033 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:41,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,034 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:28:41,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:41,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [497364283] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:41,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:41,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:41,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [901131207] [2021-05-22 02:28:41,047 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:41,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:41,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:41,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:41,047 INFO L87 Difference]: Start difference. First operand 490 states and 1546 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:41,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:41,202 INFO L93 Difference]: Finished difference Result 625 states and 1927 transitions. [2021-05-22 02:28:41,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:41,202 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:41,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:41,203 INFO L225 Difference]: With dead ends: 625 [2021-05-22 02:28:41,203 INFO L226 Difference]: Without dead ends: 603 [2021-05-22 02:28:41,203 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 113.3ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:41,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 603 states. [2021-05-22 02:28:41,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 603 to 487. [2021-05-22 02:28:41,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.156378600823045) internal successors, (1534), 486 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:41,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1534 transitions. [2021-05-22 02:28:41,208 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1534 transitions. Word has length 21 [2021-05-22 02:28:41,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:41,208 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1534 transitions. [2021-05-22 02:28:41,208 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:41,209 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1534 transitions. [2021-05-22 02:28:41,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:41,209 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:41,209 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:41,409 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 613 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3040 [2021-05-22 02:28:41,410 INFO L430 AbstractCegarLoop]: === Iteration 625 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:41,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:41,410 INFO L82 PathProgramCache]: Analyzing trace with hash -1263984893, now seen corresponding path program 613 times [2021-05-22 02:28:41,410 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:41,410 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808909216] [2021-05-22 02:28:41,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:41,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:41,511 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:41,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:41,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808909216] [2021-05-22 02:28:41,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808909216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:41,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641771909] [2021-05-22 02:28:41,511 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 614 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 614 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:41,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:41,536 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:41,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:41,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:41,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:41,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:41,632 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:41,635 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,650 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:41,653 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:41,653 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:28:41,825 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:41,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:41,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:41,834 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:41,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:41,835 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,840 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:41,841 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:41,841 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:33, output treesize:7 [2021-05-22 02:28:41,869 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:41,869 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641771909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:41,869 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:41,869 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:41,869 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719174307] [2021-05-22 02:28:41,869 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:41,869 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:41,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:41,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:41,869 INFO L87 Difference]: Start difference. First operand 487 states and 1534 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:42,200 INFO L93 Difference]: Finished difference Result 773 states and 2384 transitions. [2021-05-22 02:28:42,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:42,200 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:42,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:42,201 INFO L225 Difference]: With dead ends: 773 [2021-05-22 02:28:42,201 INFO L226 Difference]: Without dead ends: 754 [2021-05-22 02:28:42,201 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 298.0ms TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:28:42,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 754 states. [2021-05-22 02:28:42,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 754 to 493. [2021-05-22 02:28:42,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1646341463414633) internal successors, (1557), 492 states have internal predecessors, (1557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1557 transitions. [2021-05-22 02:28:42,207 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1557 transitions. Word has length 21 [2021-05-22 02:28:42,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:42,207 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1557 transitions. [2021-05-22 02:28:42,207 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,207 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1557 transitions. [2021-05-22 02:28:42,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:42,207 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:42,207 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:42,408 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3043,614 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:42,408 INFO L430 AbstractCegarLoop]: === Iteration 626 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:42,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:42,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1486193505, now seen corresponding path program 614 times [2021-05-22 02:28:42,408 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:42,408 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752204732] [2021-05-22 02:28:42,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:42,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:42,489 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:42,489 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:42,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752204732] [2021-05-22 02:28:42,489 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752204732] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:42,489 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1597889338] [2021-05-22 02:28:42,489 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 615 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 615 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:42,514 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:42,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:42,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:42,515 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:42,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:42,550 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:42,555 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:42,555 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:42,555 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:42,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:42,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:42,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:42,624 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:42,627 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:42,627 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:42,628 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:42,628 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:28:42,659 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:42,659 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1597889338] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:42,659 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:42,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:42,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719621613] [2021-05-22 02:28:42,659 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:42,660 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:42,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:42,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:42,660 INFO L87 Difference]: Start difference. First operand 493 states and 1557 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:42,848 INFO L93 Difference]: Finished difference Result 826 states and 2520 transitions. [2021-05-22 02:28:42,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:28:42,848 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:42,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:42,849 INFO L225 Difference]: With dead ends: 826 [2021-05-22 02:28:42,849 INFO L226 Difference]: Without dead ends: 766 [2021-05-22 02:28:42,850 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 169.9ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:28:42,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 766 states. [2021-05-22 02:28:42,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 766 to 493. [2021-05-22 02:28:42,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.154471544715447) internal successors, (1552), 492 states have internal predecessors, (1552), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1552 transitions. [2021-05-22 02:28:42,861 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1552 transitions. Word has length 21 [2021-05-22 02:28:42,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:42,861 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1552 transitions. [2021-05-22 02:28:42,861 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:42,861 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1552 transitions. [2021-05-22 02:28:42,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:42,862 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:42,862 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:43,062 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 615 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3060 [2021-05-22 02:28:43,062 INFO L430 AbstractCegarLoop]: === Iteration 627 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:43,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:43,062 INFO L82 PathProgramCache]: Analyzing trace with hash 422406947, now seen corresponding path program 615 times [2021-05-22 02:28:43,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:43,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877912926] [2021-05-22 02:28:43,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:43,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:43,159 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:43,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:43,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877912926] [2021-05-22 02:28:43,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877912926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:43,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [712717273] [2021-05-22 02:28:43,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 616 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 616 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:43,184 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:43,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:43,185 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:43,185 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:43,271 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:43,272 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:43,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:43,273 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:43,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:43,276 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:43,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:43,295 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:43,295 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:28:43,449 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_146, v_prenex_147], 1=[o_2, o_4]} [2021-05-22 02:28:43,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:43,453 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:43,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:43,466 INFO L518 ElimStorePlain]: Eliminatee v_prenex_147 vanished before elimination [2021-05-22 02:28:43,468 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:43,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:43,469 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:43,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:43,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:43,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:43,483 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:43,493 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:43,495 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:43,495 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:51, output treesize:13 [2021-05-22 02:28:43,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:43,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [712717273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:43,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:43,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:43,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1694944100] [2021-05-22 02:28:43,543 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:43,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:43,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:43,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:43,543 INFO L87 Difference]: Start difference. First operand 493 states and 1552 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:43,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:43,846 INFO L93 Difference]: Finished difference Result 799 states and 2474 transitions. [2021-05-22 02:28:43,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:43,846 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:43,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:43,848 INFO L225 Difference]: With dead ends: 799 [2021-05-22 02:28:43,848 INFO L226 Difference]: Without dead ends: 776 [2021-05-22 02:28:43,848 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 268.0ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:43,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 776 states. [2021-05-22 02:28:43,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 776 to 491. [2021-05-22 02:28:43,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.157142857142857) internal successors, (1547), 490 states have internal predecessors, (1547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:43,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1547 transitions. [2021-05-22 02:28:43,854 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1547 transitions. Word has length 21 [2021-05-22 02:28:43,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:43,854 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1547 transitions. [2021-05-22 02:28:43,854 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:43,854 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1547 transitions. [2021-05-22 02:28:43,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:43,855 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:43,855 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:44,055 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3063,616 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:44,055 INFO L430 AbstractCegarLoop]: === Iteration 628 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:44,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:44,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1575721435, now seen corresponding path program 616 times [2021-05-22 02:28:44,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:44,056 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1999610346] [2021-05-22 02:28:44,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:44,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:44,161 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:44,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:44,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1999610346] [2021-05-22 02:28:44,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1999610346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:44,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [257440546] [2021-05-22 02:28:44,162 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 617 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 617 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:44,186 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:44,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:44,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:44,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:44,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:44,282 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:44,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:44,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:44,285 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:44,300 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:44,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:44,303 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:28:44,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:44,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:44,388 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:44,396 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:44,404 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:44,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:44,405 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:44,413 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:44,414 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:44,414 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:28:44,468 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:44,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [257440546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:44,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:44,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:44,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825066979] [2021-05-22 02:28:44,469 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:44,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:44,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:44,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:44,469 INFO L87 Difference]: Start difference. First operand 491 states and 1547 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:44,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:44,756 INFO L93 Difference]: Finished difference Result 765 states and 2359 transitions. [2021-05-22 02:28:44,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:44,757 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:44,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:44,758 INFO L225 Difference]: With dead ends: 765 [2021-05-22 02:28:44,758 INFO L226 Difference]: Without dead ends: 746 [2021-05-22 02:28:44,758 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 265.2ms TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:44,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 746 states. [2021-05-22 02:28:44,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 746 to 487. [2021-05-22 02:28:44,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1502057613168724) internal successors, (1531), 486 states have internal predecessors, (1531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:44,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1531 transitions. [2021-05-22 02:28:44,763 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1531 transitions. Word has length 21 [2021-05-22 02:28:44,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:44,763 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1531 transitions. [2021-05-22 02:28:44,763 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:44,764 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1531 transitions. [2021-05-22 02:28:44,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:44,764 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:44,764 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:44,964 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 617 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3089 [2021-05-22 02:28:44,965 INFO L430 AbstractCegarLoop]: === Iteration 629 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:44,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:44,965 INFO L82 PathProgramCache]: Analyzing trace with hash 990283973, now seen corresponding path program 617 times [2021-05-22 02:28:44,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:44,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174577239] [2021-05-22 02:28:44,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:44,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:45,040 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:45,040 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:45,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174577239] [2021-05-22 02:28:45,040 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [174577239] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:45,040 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307669297] [2021-05-22 02:28:45,040 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 618 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 618 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:45,065 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:45,066 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:45,066 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:45,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:45,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:45,106 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:45,108 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:45,117 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:45,117 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:45,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:45,166 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,174 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:45,174 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:45,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:45,176 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:45,182 INFO L518 ElimStorePlain]: Eliminatee v_prenex_149 vanished before elimination [2021-05-22 02:28:45,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:45,182 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:28:45,207 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:45,207 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307669297] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:45,207 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:45,207 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:45,207 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689733550] [2021-05-22 02:28:45,207 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:45,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:45,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:45,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:45,208 INFO L87 Difference]: Start difference. First operand 487 states and 1531 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:45,377 INFO L93 Difference]: Finished difference Result 664 states and 2050 transitions. [2021-05-22 02:28:45,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:45,377 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:45,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:45,378 INFO L225 Difference]: With dead ends: 664 [2021-05-22 02:28:45,378 INFO L226 Difference]: Without dead ends: 635 [2021-05-22 02:28:45,379 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 126.7ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:45,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 635 states. [2021-05-22 02:28:45,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 635 to 487. [2021-05-22 02:28:45,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1502057613168724) internal successors, (1531), 486 states have internal predecessors, (1531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1531 transitions. [2021-05-22 02:28:45,384 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1531 transitions. Word has length 21 [2021-05-22 02:28:45,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:45,384 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1531 transitions. [2021-05-22 02:28:45,384 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,384 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1531 transitions. [2021-05-22 02:28:45,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:45,388 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:45,388 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:45,609 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3094,618 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:45,609 INFO L430 AbstractCegarLoop]: === Iteration 630 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:45,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:45,609 INFO L82 PathProgramCache]: Analyzing trace with hash -104414945, now seen corresponding path program 618 times [2021-05-22 02:28:45,609 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:45,609 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143552079] [2021-05-22 02:28:45,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:45,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:45,701 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:45,701 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:45,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143552079] [2021-05-22 02:28:45,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143552079] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:45,701 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508508698] [2021-05-22 02:28:45,701 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 619 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 619 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:45,726 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:45,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:45,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:45,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:45,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:45,768 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,773 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:45,773 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,773 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:45,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:45,810 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:45,812 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:45,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:45,818 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:45,819 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:45,819 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:28:45,836 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:45,837 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508508698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:45,837 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:45,837 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:45,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398744487] [2021-05-22 02:28:45,837 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:45,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:45,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:45,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:45,837 INFO L87 Difference]: Start difference. First operand 487 states and 1531 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:45,962 INFO L93 Difference]: Finished difference Result 637 states and 1959 transitions. [2021-05-22 02:28:45,962 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:45,962 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:45,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:45,963 INFO L225 Difference]: With dead ends: 637 [2021-05-22 02:28:45,963 INFO L226 Difference]: Without dead ends: 610 [2021-05-22 02:28:45,963 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:45,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-22 02:28:45,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 484. [2021-05-22 02:28:45,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:45,968 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:45,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:45,968 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:45,968 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:45,968 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:45,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:45,969 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:45,969 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:46,169 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 619 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3102 [2021-05-22 02:28:46,169 INFO L430 AbstractCegarLoop]: === Iteration 631 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:46,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:46,170 INFO L82 PathProgramCache]: Analyzing trace with hash -728700709, now seen corresponding path program 619 times [2021-05-22 02:28:46,170 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:46,170 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14670992] [2021-05-22 02:28:46,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:46,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:46,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:46,250 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:46,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14670992] [2021-05-22 02:28:46,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14670992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:46,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761366419] [2021-05-22 02:28:46,250 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 620 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 620 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:46,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:46,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:46,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:46,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:46,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:46,318 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,327 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:46,327 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:46,327 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:46,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:46,354 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,364 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:46,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:46,366 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:46,375 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:46,375 INFO L518 ElimStorePlain]: Eliminatee v_prenex_151 vanished before elimination [2021-05-22 02:28:46,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:46,376 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:46,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:46,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761366419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:46,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:46,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:46,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662425241] [2021-05-22 02:28:46,409 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:46,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:46,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:46,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:46,410 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:46,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:46,549 INFO L93 Difference]: Finished difference Result 661 states and 2042 transitions. [2021-05-22 02:28:46,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:46,550 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:46,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:46,551 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:28:46,551 INFO L226 Difference]: Without dead ends: 632 [2021-05-22 02:28:46,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 121.9ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:46,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-22 02:28:46,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 484. [2021-05-22 02:28:46,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.153209109730849) internal successors, (1523), 483 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:46,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1523 transitions. [2021-05-22 02:28:46,556 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1523 transitions. Word has length 21 [2021-05-22 02:28:46,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:46,556 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1523 transitions. [2021-05-22 02:28:46,556 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:46,556 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1523 transitions. [2021-05-22 02:28:46,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:46,556 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:46,557 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:46,757 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3106,620 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:46,757 INFO L430 AbstractCegarLoop]: === Iteration 632 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:46,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:46,757 INFO L82 PathProgramCache]: Analyzing trace with hash -431434299, now seen corresponding path program 620 times [2021-05-22 02:28:46,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:46,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1731730861] [2021-05-22 02:28:46,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:46,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:46,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:46,852 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:46,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1731730861] [2021-05-22 02:28:46,852 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1731730861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:46,852 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499262677] [2021-05-22 02:28:46,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 621 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 621 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:46,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:46,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:46,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:46,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:46,965 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:46,966 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:46,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:46,967 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:46,970 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:46,985 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:46,988 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:46,988 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:28:47,032 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_152, v_prenex_153]} [2021-05-22 02:28:47,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:47,036 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:47,050 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:47,052 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:47,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:47,053 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,065 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:47,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:47,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:47,068 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,079 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:47,080 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:47,081 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:56, output treesize:19 [2021-05-22 02:28:47,130 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:47,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499262677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:47,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:47,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:47,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637745626] [2021-05-22 02:28:47,130 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:47,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:47,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:47,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:47,131 INFO L87 Difference]: Start difference. First operand 484 states and 1523 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:47,349 INFO L93 Difference]: Finished difference Result 685 states and 2115 transitions. [2021-05-22 02:28:47,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:47,350 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:47,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:47,350 INFO L225 Difference]: With dead ends: 685 [2021-05-22 02:28:47,351 INFO L226 Difference]: Without dead ends: 662 [2021-05-22 02:28:47,351 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 197.0ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:47,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2021-05-22 02:28:47,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 485. [2021-05-22 02:28:47,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.159090909090909) internal successors, (1529), 484 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1529 transitions. [2021-05-22 02:28:47,356 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1529 transitions. Word has length 21 [2021-05-22 02:28:47,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:47,356 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1529 transitions. [2021-05-22 02:28:47,356 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,356 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1529 transitions. [2021-05-22 02:28:47,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:47,356 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:47,356 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:47,557 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 621 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3111 [2021-05-22 02:28:47,557 INFO L430 AbstractCegarLoop]: === Iteration 633 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:47,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:47,557 INFO L82 PathProgramCache]: Analyzing trace with hash -715696983, now seen corresponding path program 621 times [2021-05-22 02:28:47,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:47,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1260035856] [2021-05-22 02:28:47,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:47,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:47,650 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:47,651 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:47,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1260035856] [2021-05-22 02:28:47,651 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1260035856] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:47,651 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [838825332] [2021-05-22 02:28:47,651 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 622 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 622 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:47,676 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:47,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:47,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:47,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:47,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:47,711 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,716 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:47,716 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,716 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:28:47,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:47,738 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:47,740 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:47,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:47,748 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:47,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:47,749 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:28:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:47,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [838825332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:47,820 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:47,820 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:47,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406249373] [2021-05-22 02:28:47,821 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:47,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:47,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:47,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:47,821 INFO L87 Difference]: Start difference. First operand 485 states and 1529 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:47,986 INFO L93 Difference]: Finished difference Result 690 states and 2123 transitions. [2021-05-22 02:28:47,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:28:47,986 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:47,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:47,987 INFO L225 Difference]: With dead ends: 690 [2021-05-22 02:28:47,987 INFO L226 Difference]: Without dead ends: 663 [2021-05-22 02:28:47,987 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 182.0ms TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:28:47,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 663 states. [2021-05-22 02:28:47,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 663 to 483. [2021-05-22 02:28:47,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1493775933609958) internal successors, (1518), 482 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1518 transitions. [2021-05-22 02:28:47,992 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1518 transitions. Word has length 21 [2021-05-22 02:28:47,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:47,992 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1518 transitions. [2021-05-22 02:28:47,992 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:47,992 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1518 transitions. [2021-05-22 02:28:47,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:47,993 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:47,993 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:48,193 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 622 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3121 [2021-05-22 02:28:48,193 INFO L430 AbstractCegarLoop]: === Iteration 634 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:48,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:48,194 INFO L82 PathProgramCache]: Analyzing trace with hash 739785677, now seen corresponding path program 622 times [2021-05-22 02:28:48,194 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:48,194 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3830685] [2021-05-22 02:28:48,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:48,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:48,292 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:48,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:48,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3830685] [2021-05-22 02:28:48,293 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3830685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:48,293 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1056812913] [2021-05-22 02:28:48,293 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 623 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 623 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:48,317 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:48,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:48,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:48,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:48,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:48,376 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,380 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:48,380 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,380 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:28:48,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:48,397 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,400 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:48,400 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:48,400 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,400 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:28:48,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:48,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1056812913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:48,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:48,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:48,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [383970222] [2021-05-22 02:28:48,412 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:48,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:48,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:48,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:48,413 INFO L87 Difference]: Start difference. First operand 483 states and 1518 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:48,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:48,529 INFO L93 Difference]: Finished difference Result 659 states and 2033 transitions. [2021-05-22 02:28:48,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:48,529 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:48,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:48,530 INFO L225 Difference]: With dead ends: 659 [2021-05-22 02:28:48,530 INFO L226 Difference]: Without dead ends: 640 [2021-05-22 02:28:48,530 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 139.7ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:48,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-05-22 02:28:48,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 483. [2021-05-22 02:28:48,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1493775933609958) internal successors, (1518), 482 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:48,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1518 transitions. [2021-05-22 02:28:48,536 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1518 transitions. Word has length 21 [2021-05-22 02:28:48,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:48,536 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1518 transitions. [2021-05-22 02:28:48,536 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:48,536 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1518 transitions. [2021-05-22 02:28:48,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:48,536 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:48,536 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:48,737 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 623 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3130 [2021-05-22 02:28:48,737 INFO L430 AbstractCegarLoop]: === Iteration 635 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:48,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:48,737 INFO L82 PathProgramCache]: Analyzing trace with hash 119921763, now seen corresponding path program 623 times [2021-05-22 02:28:48,737 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:48,737 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354299787] [2021-05-22 02:28:48,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:48,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:48,810 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:48,811 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:48,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354299787] [2021-05-22 02:28:48,811 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354299787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:48,811 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1898685742] [2021-05-22 02:28:48,811 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 624 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 624 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:48,838 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:28:48,838 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:48,839 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:48,839 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:48,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:48,874 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,879 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:48,879 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,880 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:28:48,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:28:48,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,904 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:28:48,904 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:48,913 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:48,913 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:48,913 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:48,914 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:28:48,946 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:48,947 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1898685742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:48,947 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:48,947 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:28:48,947 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762659240] [2021-05-22 02:28:48,947 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:28:48,947 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:48,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:28:48,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:28:48,947 INFO L87 Difference]: Start difference. First operand 483 states and 1518 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:49,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:49,093 INFO L93 Difference]: Finished difference Result 626 states and 1929 transitions. [2021-05-22 02:28:49,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:49,093 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:49,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:49,094 INFO L225 Difference]: With dead ends: 626 [2021-05-22 02:28:49,094 INFO L226 Difference]: Without dead ends: 597 [2021-05-22 02:28:49,094 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 121.3ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:49,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-05-22 02:28:49,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 481. [2021-05-22 02:28:49,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.152083333333333) internal successors, (1513), 480 states have internal predecessors, (1513), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:49,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1513 transitions. [2021-05-22 02:28:49,101 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1513 transitions. Word has length 21 [2021-05-22 02:28:49,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:49,101 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1513 transitions. [2021-05-22 02:28:49,101 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:49,101 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1513 transitions. [2021-05-22 02:28:49,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:49,102 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:49,102 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:49,312 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 624 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3133 [2021-05-22 02:28:49,313 INFO L430 AbstractCegarLoop]: === Iteration 636 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:49,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:49,313 INFO L82 PathProgramCache]: Analyzing trace with hash 417188173, now seen corresponding path program 624 times [2021-05-22 02:28:49,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:49,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1739231104] [2021-05-22 02:28:49,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:49,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:49,413 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:49,413 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:49,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1739231104] [2021-05-22 02:28:49,413 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1739231104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:49,413 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820167148] [2021-05-22 02:28:49,413 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 625 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 625 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:49,438 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:28:49,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:49,438 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:49,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:49,520 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_154]} [2021-05-22 02:28:49,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:49,524 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:49,538 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:49,540 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:49,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:49,541 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:49,553 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:49,554 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:49,554 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:28:49,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:49,597 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:49,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:49,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:49,600 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:49,616 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:49,618 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:49,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:49,619 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:49,634 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:49,635 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:49,635 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:64, output treesize:19 [2021-05-22 02:28:49,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:49,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820167148] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:49,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:49,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:49,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420718069] [2021-05-22 02:28:49,708 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:49,709 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:49,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:49,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:49,709 INFO L87 Difference]: Start difference. First operand 481 states and 1513 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:50,125 INFO L93 Difference]: Finished difference Result 825 states and 2525 transitions. [2021-05-22 02:28:50,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:28:50,125 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:50,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:50,126 INFO L225 Difference]: With dead ends: 825 [2021-05-22 02:28:50,126 INFO L226 Difference]: Without dead ends: 802 [2021-05-22 02:28:50,126 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 368.4ms TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:28:50,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 802 states. [2021-05-22 02:28:50,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 802 to 496. [2021-05-22 02:28:50,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 496 states, 495 states have (on average 3.1676767676767676) internal successors, (1568), 495 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 496 states to 496 states and 1568 transitions. [2021-05-22 02:28:50,132 INFO L78 Accepts]: Start accepts. Automaton has 496 states and 1568 transitions. Word has length 21 [2021-05-22 02:28:50,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:50,132 INFO L482 AbstractCegarLoop]: Abstraction has 496 states and 1568 transitions. [2021-05-22 02:28:50,132 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,132 INFO L276 IsEmpty]: Start isEmpty. Operand 496 states and 1568 transitions. [2021-05-22 02:28:50,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:50,133 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:50,133 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:50,333 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3136,625 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:50,333 INFO L430 AbstractCegarLoop]: === Iteration 637 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:50,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:50,333 INFO L82 PathProgramCache]: Analyzing trace with hash 132925489, now seen corresponding path program 625 times [2021-05-22 02:28:50,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:50,333 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629674016] [2021-05-22 02:28:50,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:50,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:50,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:50,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:50,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629674016] [2021-05-22 02:28:50,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629674016] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:50,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [72458688] [2021-05-22 02:28:50,425 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 626 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 626 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:50,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:50,449 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:50,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:50,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:50,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:50,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:50,492 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:50,500 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:50,501 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:50,501 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:50,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:50,528 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:50,538 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:50,538 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:50,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:50,540 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:50,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:50,549 INFO L518 ElimStorePlain]: Eliminatee v_prenex_156 vanished before elimination [2021-05-22 02:28:50,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:50,550 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:28:50,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:50,623 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [72458688] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:50,623 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:50,623 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:50,623 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107463149] [2021-05-22 02:28:50,623 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:50,623 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:50,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:50,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:50,623 INFO L87 Difference]: Start difference. First operand 496 states and 1568 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:50,844 INFO L93 Difference]: Finished difference Result 747 states and 2287 transitions. [2021-05-22 02:28:50,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:50,844 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:50,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:50,845 INFO L225 Difference]: With dead ends: 747 [2021-05-22 02:28:50,845 INFO L226 Difference]: Without dead ends: 720 [2021-05-22 02:28:50,845 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 235.8ms TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:28:50,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-05-22 02:28:50,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 507. [2021-05-22 02:28:50,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.1699604743083003) internal successors, (1604), 506 states have internal predecessors, (1604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1604 transitions. [2021-05-22 02:28:50,850 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1604 transitions. Word has length 21 [2021-05-22 02:28:50,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:50,850 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1604 transitions. [2021-05-22 02:28:50,851 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:50,851 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1604 transitions. [2021-05-22 02:28:50,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:50,851 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:50,851 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:51,051 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3146,626 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:51,052 INFO L430 AbstractCegarLoop]: === Iteration 638 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:51,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:51,052 INFO L82 PathProgramCache]: Analyzing trace with hash -1827821477, now seen corresponding path program 626 times [2021-05-22 02:28:51,052 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:51,052 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556673136] [2021-05-22 02:28:51,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:51,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:51,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:51,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:51,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556673136] [2021-05-22 02:28:51,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556673136] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:51,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [895733720] [2021-05-22 02:28:51,155 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 627 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 627 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:51,179 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:51,180 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:51,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:51,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:51,262 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_157], 1=[o_2]} [2021-05-22 02:28:51,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:51,265 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:51,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:51,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:51,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:51,282 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:51,294 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:51,295 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:51,295 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:28:51,350 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:51,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:51,351 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:51,358 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:51,360 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:51,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:51,361 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:51,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:51,369 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:51,369 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:28:51,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:51,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [895733720] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:51,415 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:51,415 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:51,415 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449885382] [2021-05-22 02:28:51,415 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:51,415 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:51,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:51,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:51,416 INFO L87 Difference]: Start difference. First operand 507 states and 1604 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:51,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:51,752 INFO L93 Difference]: Finished difference Result 772 states and 2373 transitions. [2021-05-22 02:28:51,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:28:51,752 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:51,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:51,753 INFO L225 Difference]: With dead ends: 772 [2021-05-22 02:28:51,753 INFO L226 Difference]: Without dead ends: 753 [2021-05-22 02:28:51,753 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 377.4ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:28:51,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 753 states. [2021-05-22 02:28:51,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 753 to 493. [2021-05-22 02:28:51,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.160569105691057) internal successors, (1555), 492 states have internal predecessors, (1555), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:51,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1555 transitions. [2021-05-22 02:28:51,759 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1555 transitions. Word has length 21 [2021-05-22 02:28:51,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:51,759 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1555 transitions. [2021-05-22 02:28:51,759 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:51,759 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1555 transitions. [2021-05-22 02:28:51,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:51,760 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:51,760 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:51,960 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3157,627 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:51,960 INFO L430 AbstractCegarLoop]: === Iteration 639 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:51,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:51,960 INFO L82 PathProgramCache]: Analyzing trace with hash 1293533791, now seen corresponding path program 627 times [2021-05-22 02:28:51,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:51,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394708118] [2021-05-22 02:28:51,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:51,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:52,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:52,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:52,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394708118] [2021-05-22 02:28:52,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394708118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:52,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1167668402] [2021-05-22 02:28:52,049 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 628 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 628 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:52,074 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:52,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:52,074 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:52,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:52,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:52,114 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:52,116 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:52,125 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:52,125 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:28:52,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:52,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:52,164 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:28:52,164 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,165 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:28:52,206 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:52,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1167668402] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:52,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:52,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:28:52,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890558471] [2021-05-22 02:28:52,206 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:28:52,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:52,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:28:52,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:28:52,207 INFO L87 Difference]: Start difference. First operand 493 states and 1555 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:52,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:52,375 INFO L93 Difference]: Finished difference Result 675 states and 2074 transitions. [2021-05-22 02:28:52,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:28:52,375 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:52,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:52,376 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:28:52,376 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:28:52,376 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 198.3ms TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:28:52,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:28:52,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 475. [2021-05-22 02:28:52,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1392405063291138) internal successors, (1488), 474 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:52,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1488 transitions. [2021-05-22 02:28:52,382 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1488 transitions. Word has length 21 [2021-05-22 02:28:52,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:52,382 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1488 transitions. [2021-05-22 02:28:52,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:52,382 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1488 transitions. [2021-05-22 02:28:52,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:52,383 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:52,383 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:52,583 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 628 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3162 [2021-05-22 02:28:52,583 INFO L430 AbstractCegarLoop]: === Iteration 640 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:52,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:52,583 INFO L82 PathProgramCache]: Analyzing trace with hash 447204325, now seen corresponding path program 628 times [2021-05-22 02:28:52,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:52,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472502578] [2021-05-22 02:28:52,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:52,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:52,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:52,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:52,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472502578] [2021-05-22 02:28:52,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472502578] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:52,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1848117765] [2021-05-22 02:28:52,689 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 629 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 629 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:52,714 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:52,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:52,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:52,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:52,804 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:52,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:52,805 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:52,815 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:52,815 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:34, output treesize:27 [2021-05-22 02:28:52,891 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:52,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:52,893 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,899 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:52,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:52,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:52,902 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:52,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:52,910 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:31, output treesize:9 [2021-05-22 02:28:52,918 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:52,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1848117765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:52,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:52,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:28:52,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591806771] [2021-05-22 02:28:52,919 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:28:52,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:52,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:28:52,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:52,920 INFO L87 Difference]: Start difference. First operand 475 states and 1488 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:53,098 INFO L93 Difference]: Finished difference Result 554 states and 1715 transitions. [2021-05-22 02:28:53,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:53,098 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:53,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:53,099 INFO L225 Difference]: With dead ends: 554 [2021-05-22 02:28:53,099 INFO L226 Difference]: Without dead ends: 532 [2021-05-22 02:28:53,100 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 178.1ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:53,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-22 02:28:53,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 481. [2021-05-22 02:28:53,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.14375) internal successors, (1509), 480 states have internal predecessors, (1509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1509 transitions. [2021-05-22 02:28:53,106 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1509 transitions. Word has length 21 [2021-05-22 02:28:53,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:53,106 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1509 transitions. [2021-05-22 02:28:53,106 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,106 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1509 transitions. [2021-05-22 02:28:53,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:53,107 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:53,107 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:53,307 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 629 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3165 [2021-05-22 02:28:53,308 INFO L430 AbstractCegarLoop]: === Iteration 641 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:53,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:53,308 INFO L82 PathProgramCache]: Analyzing trace with hash -54587011, now seen corresponding path program 629 times [2021-05-22 02:28:53,308 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:53,308 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534062802] [2021-05-22 02:28:53,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:53,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:53,407 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:53,407 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:53,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534062802] [2021-05-22 02:28:53,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534062802] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:53,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581106173] [2021-05-22 02:28:53,407 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 630 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 630 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:53,432 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:53,432 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:53,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:53,433 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:53,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:53,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:53,529 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:53,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:53,540 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:53,540 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:39, output treesize:32 [2021-05-22 02:28:53,568 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:53,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:53,569 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:53,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:53,579 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:53,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:53,580 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:53,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:53,589 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:53,589 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:28:53,607 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:53,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1581106173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:53,608 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:53,608 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:53,608 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615488040] [2021-05-22 02:28:53,608 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:53,608 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:53,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:53,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:53,608 INFO L87 Difference]: Start difference. First operand 481 states and 1509 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:53,760 INFO L93 Difference]: Finished difference Result 563 states and 1739 transitions. [2021-05-22 02:28:53,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:53,761 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:53,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:53,762 INFO L225 Difference]: With dead ends: 563 [2021-05-22 02:28:53,762 INFO L226 Difference]: Without dead ends: 541 [2021-05-22 02:28:53,762 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 165.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:53,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-22 02:28:53,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 478. [2021-05-22 02:28:53,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.138364779874214) internal successors, (1497), 477 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1497 transitions. [2021-05-22 02:28:53,766 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1497 transitions. Word has length 21 [2021-05-22 02:28:53,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:53,766 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1497 transitions. [2021-05-22 02:28:53,767 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:53,767 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1497 transitions. [2021-05-22 02:28:53,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:53,767 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:53,767 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:53,967 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3172,630 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:53,968 INFO L430 AbstractCegarLoop]: === Iteration 642 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:53,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:53,968 INFO L82 PathProgramCache]: Analyzing trace with hash 2133596165, now seen corresponding path program 630 times [2021-05-22 02:28:53,968 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:53,968 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874458137] [2021-05-22 02:28:53,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:53,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:54,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:54,086 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:54,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874458137] [2021-05-22 02:28:54,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874458137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:54,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [38432541] [2021-05-22 02:28:54,087 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 631 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 631 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:54,115 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:28:54,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:54,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:54,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:54,208 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:54,209 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,215 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,217 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:54,217 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:28:54,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:54,243 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,252 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,254 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:54,254 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,263 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:28:54,281 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:54,282 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [38432541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:54,282 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:54,282 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:54,282 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708521274] [2021-05-22 02:28:54,282 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:54,282 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:54,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:54,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:54,282 INFO L87 Difference]: Start difference. First operand 478 states and 1497 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:54,404 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:54,405 INFO L93 Difference]: Finished difference Result 551 states and 1706 transitions. [2021-05-22 02:28:54,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:54,405 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:54,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:54,406 INFO L225 Difference]: With dead ends: 551 [2021-05-22 02:28:54,406 INFO L226 Difference]: Without dead ends: 529 [2021-05-22 02:28:54,406 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 178.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:54,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-22 02:28:54,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 475. [2021-05-22 02:28:54,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1392405063291138) internal successors, (1488), 474 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:54,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1488 transitions. [2021-05-22 02:28:54,410 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1488 transitions. Word has length 21 [2021-05-22 02:28:54,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:54,411 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1488 transitions. [2021-05-22 02:28:54,411 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:54,411 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1488 transitions. [2021-05-22 02:28:54,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:54,411 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:54,411 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:54,611 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 631 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3175 [2021-05-22 02:28:54,612 INFO L430 AbstractCegarLoop]: === Iteration 643 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:54,612 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:54,612 INFO L82 PathProgramCache]: Analyzing trace with hash -1864793109, now seen corresponding path program 631 times [2021-05-22 02:28:54,612 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:54,612 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023079873] [2021-05-22 02:28:54,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:54,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:54,720 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:54,720 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:54,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023079873] [2021-05-22 02:28:54,720 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023079873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:54,720 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689243114] [2021-05-22 02:28:54,720 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 632 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 632 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:54,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:54,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:54,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:54,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:54,823 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,831 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:54,834 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:41, output treesize:34 [2021-05-22 02:28:54,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:54,929 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,931 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:54,933 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,953 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,955 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:54,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:54,956 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:54,974 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:54,975 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:54,975 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:5 [2021-05-22 02:28:55,009 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:55,009 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689243114] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:55,009 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:55,009 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:55,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [938812559] [2021-05-22 02:28:55,009 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:55,009 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:55,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:55,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:55,010 INFO L87 Difference]: Start difference. First operand 475 states and 1488 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:55,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:55,228 INFO L93 Difference]: Finished difference Result 752 states and 2297 transitions. [2021-05-22 02:28:55,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:28:55,228 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:55,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:55,229 INFO L225 Difference]: With dead ends: 752 [2021-05-22 02:28:55,229 INFO L226 Difference]: Without dead ends: 692 [2021-05-22 02:28:55,229 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 218.5ms TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:28:55,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-05-22 02:28:55,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 475. [2021-05-22 02:28:55,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1392405063291138) internal successors, (1488), 474 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:55,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1488 transitions. [2021-05-22 02:28:55,235 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1488 transitions. Word has length 21 [2021-05-22 02:28:55,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:55,235 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1488 transitions. [2021-05-22 02:28:55,235 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:55,235 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1488 transitions. [2021-05-22 02:28:55,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:55,236 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:55,236 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:55,436 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3178,632 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:55,436 INFO L430 AbstractCegarLoop]: === Iteration 644 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:55,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:55,436 INFO L82 PathProgramCache]: Analyzing trace with hash -841990937, now seen corresponding path program 632 times [2021-05-22 02:28:55,436 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:55,436 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [285092125] [2021-05-22 02:28:55,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:55,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:55,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:55,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:55,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [285092125] [2021-05-22 02:28:55,527 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [285092125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:55,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [677978582] [2021-05-22 02:28:55,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 633 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 633 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:55,552 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:55,552 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:55,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:55,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:55,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:55,628 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:55,629 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:55,635 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:55,637 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:55,637 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:28:55,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:28:55,682 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:55,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:55,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:55,685 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:55,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:55,701 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:55,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:55,702 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:55,715 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:55,716 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:28:55,716 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:28:55,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:55,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [677978582] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:55,763 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:55,764 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:55,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447124055] [2021-05-22 02:28:55,764 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:55,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:55,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:55,764 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:55,764 INFO L87 Difference]: Start difference. First operand 475 states and 1488 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:56,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:56,017 INFO L93 Difference]: Finished difference Result 643 states and 1987 transitions. [2021-05-22 02:28:56,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:28:56,017 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:56,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:56,018 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:28:56,018 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:28:56,018 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 189.0ms TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:28:56,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:28:56,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 475. [2021-05-22 02:28:56,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1392405063291138) internal successors, (1488), 474 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:56,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1488 transitions. [2021-05-22 02:28:56,023 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1488 transitions. Word has length 21 [2021-05-22 02:28:56,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:56,023 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1488 transitions. [2021-05-22 02:28:56,023 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:56,023 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1488 transitions. [2021-05-22 02:28:56,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:56,024 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:56,024 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:56,224 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 633 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3192 [2021-05-22 02:28:56,224 INFO L430 AbstractCegarLoop]: === Iteration 645 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:56,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:56,225 INFO L82 PathProgramCache]: Analyzing trace with hash -1126253621, now seen corresponding path program 633 times [2021-05-22 02:28:56,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:56,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052799240] [2021-05-22 02:28:56,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:56,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:56,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:56,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:56,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052799240] [2021-05-22 02:28:56,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052799240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:56,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812219522] [2021-05-22 02:28:56,322 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 634 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 634 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:56,347 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:28:56,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:56,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:28:56,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:56,506 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_162, v_prenex_164], 1=[v_prenex_160, o_4]} [2021-05-22 02:28:56,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:56,510 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:56,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:28:56,593 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,629 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:56,630 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,661 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,664 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-1 vars, End of recursive call: 2 dim-0 vars, and 4 xjuncts. [2021-05-22 02:28:56,664 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:137, output treesize:82 [2021-05-22 02:28:56,736 INFO L446 ElimStorePlain]: Different costs {1=[o_2], 3=[o_0]} [2021-05-22 02:28:56,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:56,741 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:28:56,745 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:56,749 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,779 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,779 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:56,780 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,782 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:56,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:28:56,783 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:56,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:56,807 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:28:56,807 INFO L247 ElimStorePlain]: Needed 6 recursive calls to eliminate 5 variables, input treesize:109, output treesize:26 [2021-05-22 02:28:56,880 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:56,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812219522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:56,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:56,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:56,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536374774] [2021-05-22 02:28:56,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:56,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:56,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:56,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:56,881 INFO L87 Difference]: Start difference. First operand 475 states and 1488 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:57,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:57,331 INFO L93 Difference]: Finished difference Result 686 states and 2121 transitions. [2021-05-22 02:28:57,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:28:57,331 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:57,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:57,332 INFO L225 Difference]: With dead ends: 686 [2021-05-22 02:28:57,332 INFO L226 Difference]: Without dead ends: 659 [2021-05-22 02:28:57,332 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 410.1ms TimeCoverageRelationStatistics Valid=83, Invalid=423, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:28:57,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-05-22 02:28:57,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 487. [2021-05-22 02:28:57,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1316872427983538) internal successors, (1522), 486 states have internal predecessors, (1522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:57,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1522 transitions. [2021-05-22 02:28:57,338 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1522 transitions. Word has length 21 [2021-05-22 02:28:57,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:57,338 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1522 transitions. [2021-05-22 02:28:57,338 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:57,338 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1522 transitions. [2021-05-22 02:28:57,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:57,338 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:57,338 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:57,539 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3202,634 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:57,539 INFO L430 AbstractCegarLoop]: === Iteration 646 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:57,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:57,539 INFO L82 PathProgramCache]: Analyzing trace with hash 560138219, now seen corresponding path program 634 times [2021-05-22 02:28:57,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:57,539 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040669924] [2021-05-22 02:28:57,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:57,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:57,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:57,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:57,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040669924] [2021-05-22 02:28:57,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1040669924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:57,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1366887970] [2021-05-22 02:28:57,635 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 635 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 635 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:57,659 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:28:57,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:57,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:57,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:57,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:57,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:57,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:57,746 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:57,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:57,749 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:57,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:57,764 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:57,764 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:28:57,815 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:57,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:57,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:57,823 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:57,825 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:57,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:28:57,826 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:57,833 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:57,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:57,834 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:7 [2021-05-22 02:28:57,864 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:57,864 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1366887970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:57,864 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:57,864 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:28:57,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685712611] [2021-05-22 02:28:57,864 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:28:57,864 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:57,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:28:57,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:28:57,865 INFO L87 Difference]: Start difference. First operand 487 states and 1522 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:58,106 INFO L93 Difference]: Finished difference Result 619 states and 1909 transitions. [2021-05-22 02:28:58,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:28:58,106 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:58,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:58,107 INFO L225 Difference]: With dead ends: 619 [2021-05-22 02:28:58,107 INFO L226 Difference]: Without dead ends: 598 [2021-05-22 02:28:58,107 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 188.8ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:28:58,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 598 states. [2021-05-22 02:28:58,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 598 to 473. [2021-05-22 02:28:58,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.141949152542373) internal successors, (1483), 472 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1483 transitions. [2021-05-22 02:28:58,112 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1483 transitions. Word has length 21 [2021-05-22 02:28:58,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:58,112 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1483 transitions. [2021-05-22 02:28:58,112 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,112 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1483 transitions. [2021-05-22 02:28:58,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:58,113 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:58,113 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:58,313 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3217,635 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:58,313 INFO L430 AbstractCegarLoop]: === Iteration 647 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:58,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:58,314 INFO L82 PathProgramCache]: Analyzing trace with hash -428618089, now seen corresponding path program 635 times [2021-05-22 02:28:58,314 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:58,314 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1688861039] [2021-05-22 02:28:58,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:58,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:58,418 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:58,418 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:58,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1688861039] [2021-05-22 02:28:58,418 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1688861039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:58,418 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028903745] [2021-05-22 02:28:58,418 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 636 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 636 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:58,443 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:28:58,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:58,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:58,444 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:58,517 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:58,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:58,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:58,519 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:58,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:58,522 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:58,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:58,540 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:58,540 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:60, output treesize:36 [2021-05-22 02:28:58,661 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:58,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:58,662 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:58,668 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:58,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:58,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:58,671 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:58,676 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:58,677 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:58,677 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:31, output treesize:9 [2021-05-22 02:28:58,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:58,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1028903745] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:58,685 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:58,685 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:28:58,685 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331445476] [2021-05-22 02:28:58,685 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:28:58,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:58,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:28:58,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:58,686 INFO L87 Difference]: Start difference. First operand 473 states and 1483 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:58,828 INFO L93 Difference]: Finished difference Result 604 states and 1869 transitions. [2021-05-22 02:28:58,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:58,829 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:58,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:58,829 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:28:58,829 INFO L226 Difference]: Without dead ends: 582 [2021-05-22 02:28:58,830 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 186.3ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:28:58,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2021-05-22 02:28:58,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 480. [2021-05-22 02:28:58,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.154488517745303) internal successors, (1511), 479 states have internal predecessors, (1511), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1511 transitions. [2021-05-22 02:28:58,834 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1511 transitions. Word has length 21 [2021-05-22 02:28:58,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:58,834 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1511 transitions. [2021-05-22 02:28:58,835 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:58,835 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1511 transitions. [2021-05-22 02:28:58,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:58,835 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:58,835 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:59,035 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3226,636 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:59,036 INFO L430 AbstractCegarLoop]: === Iteration 648 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:59,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:59,036 INFO L82 PathProgramCache]: Analyzing trace with hash -930409425, now seen corresponding path program 636 times [2021-05-22 02:28:59,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:59,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484639530] [2021-05-22 02:28:59,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:59,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:59,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:59,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:59,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484639530] [2021-05-22 02:28:59,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484639530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:59,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1849676341] [2021-05-22 02:28:59,141 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 637 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 637 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:59,165 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:28:59,166 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:28:59,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:59,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:59,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:28:59,240 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,241 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:59,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:28:59,242 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,258 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:59,261 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:28:59,261 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:60, output treesize:36 [2021-05-22 02:28:59,332 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:59,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:59,334 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,341 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:59,343 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:59,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:28:59,344 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:59,351 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,351 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:12 [2021-05-22 02:28:59,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:59,364 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1849676341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:59,364 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:28:59,365 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:28:59,365 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1956096721] [2021-05-22 02:28:59,365 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:28:59,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:28:59,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:28:59,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:59,365 INFO L87 Difference]: Start difference. First operand 480 states and 1511 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:59,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:28:59,497 INFO L93 Difference]: Finished difference Result 595 states and 1845 transitions. [2021-05-22 02:28:59,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:28:59,497 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:28:59,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:28:59,498 INFO L225 Difference]: With dead ends: 595 [2021-05-22 02:28:59,498 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:28:59,498 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 171.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:28:59,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:28:59,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 477. [2021-05-22 02:28:59,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.149159663865546) internal successors, (1499), 476 states have internal predecessors, (1499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:59,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1499 transitions. [2021-05-22 02:28:59,503 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1499 transitions. Word has length 21 [2021-05-22 02:28:59,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:28:59,503 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1499 transitions. [2021-05-22 02:28:59,503 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:28:59,503 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1499 transitions. [2021-05-22 02:28:59,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:28:59,504 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:28:59,504 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:28:59,704 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3235,637 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:59,704 INFO L430 AbstractCegarLoop]: === Iteration 649 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:28:59,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:28:59,704 INFO L82 PathProgramCache]: Analyzing trace with hash -25502583, now seen corresponding path program 637 times [2021-05-22 02:28:59,704 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:28:59,704 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [519254071] [2021-05-22 02:28:59,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:28:59,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:59,793 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:28:59,794 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:28:59,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [519254071] [2021-05-22 02:28:59,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [519254071] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:28:59,794 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [604859584] [2021-05-22 02:28:59,794 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 638 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 638 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:28:59,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:28:59,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:28:59,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:28:59,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:28:59,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:28:59,867 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:28:59,876 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:28:59,879 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:28:59,879 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:00,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:00,022 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:00,025 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,041 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:00,043 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,043 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:00,043 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:00,059 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:00,059 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:5 [2021-05-22 02:29:00,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:00,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [604859584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:00,066 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:00,066 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:00,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614182281] [2021-05-22 02:29:00,067 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:00,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:00,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:00,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:00,067 INFO L87 Difference]: Start difference. First operand 477 states and 1499 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:00,214 INFO L93 Difference]: Finished difference Result 582 states and 1793 transitions. [2021-05-22 02:29:00,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:00,215 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:00,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:00,216 INFO L225 Difference]: With dead ends: 582 [2021-05-22 02:29:00,216 INFO L226 Difference]: Without dead ends: 549 [2021-05-22 02:29:00,216 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 164.6ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:00,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-22 02:29:00,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 479. [2021-05-22 02:29:00,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1401673640167362) internal successors, (1501), 478 states have internal predecessors, (1501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1501 transitions. [2021-05-22 02:29:00,220 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1501 transitions. Word has length 21 [2021-05-22 02:29:00,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:00,221 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1501 transitions. [2021-05-22 02:29:00,221 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,221 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1501 transitions. [2021-05-22 02:29:00,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:00,221 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:00,221 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:00,421 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 638 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3240 [2021-05-22 02:29:00,422 INFO L430 AbstractCegarLoop]: === Iteration 650 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:00,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:00,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1598835185, now seen corresponding path program 638 times [2021-05-22 02:29:00,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:00,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534345070] [2021-05-22 02:29:00,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:00,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:00,515 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:00,515 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:00,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534345070] [2021-05-22 02:29:00,515 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534345070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:00,516 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131654267] [2021-05-22 02:29:00,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 639 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 639 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:00,540 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:00,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:00,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:00,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:00,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:00,591 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,600 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:00,604 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:00,604 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:00,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:00,692 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:00,694 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,713 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:00,715 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:00,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:00,716 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:00,733 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:00,734 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:00,734 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:13 [2021-05-22 02:29:00,752 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:00,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131654267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:00,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:00,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:00,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022979344] [2021-05-22 02:29:00,753 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:00,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:00,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:00,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:00,753 INFO L87 Difference]: Start difference. First operand 479 states and 1501 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:00,925 INFO L93 Difference]: Finished difference Result 576 states and 1775 transitions. [2021-05-22 02:29:00,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:00,926 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:00,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:00,927 INFO L225 Difference]: With dead ends: 576 [2021-05-22 02:29:00,927 INFO L226 Difference]: Without dead ends: 549 [2021-05-22 02:29:00,927 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 160.0ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:00,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-22 02:29:00,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 477. [2021-05-22 02:29:00,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.142857142857143) internal successors, (1496), 476 states have internal predecessors, (1496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1496 transitions. [2021-05-22 02:29:00,931 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1496 transitions. Word has length 21 [2021-05-22 02:29:00,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:00,932 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1496 transitions. [2021-05-22 02:29:00,932 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:00,932 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1496 transitions. [2021-05-22 02:29:00,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:00,932 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:00,932 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:01,132 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3254,639 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:01,133 INFO L430 AbstractCegarLoop]: === Iteration 651 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:01,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:01,133 INFO L82 PathProgramCache]: Analyzing trace with hash -1843992401, now seen corresponding path program 639 times [2021-05-22 02:29:01,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:01,133 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351200973] [2021-05-22 02:29:01,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:01,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:01,238 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:01,238 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:01,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351200973] [2021-05-22 02:29:01,238 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351200973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:01,238 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1819727497] [2021-05-22 02:29:01,239 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 640 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 640 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:01,268 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:01,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:01,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:01,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:01,341 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:01,341 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:01,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:01,342 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:01,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:01,345 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:01,360 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:01,363 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:01,363 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:60, output treesize:36 [2021-05-22 02:29:01,474 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_165, v_prenex_166], 1=[o_2, o_4]} [2021-05-22 02:29:01,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:01,478 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:01,489 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:01,489 INFO L518 ElimStorePlain]: Eliminatee v_prenex_166 vanished before elimination [2021-05-22 02:29:01,491 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:01,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:01,492 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:01,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:01,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:01,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:01,504 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:01,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:01,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:01,514 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:46, output treesize:15 [2021-05-22 02:29:01,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:01,540 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1819727497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:01,540 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:01,540 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:01,540 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373096463] [2021-05-22 02:29:01,540 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:01,540 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:01,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:01,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:01,540 INFO L87 Difference]: Start difference. First operand 477 states and 1496 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:01,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:01,727 INFO L93 Difference]: Finished difference Result 613 states and 1895 transitions. [2021-05-22 02:29:01,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:01,727 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:01,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:01,728 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:29:01,728 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:29:01,728 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 185.0ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:01,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:29:01,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 477. [2021-05-22 02:29:01,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.142857142857143) internal successors, (1496), 476 states have internal predecessors, (1496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:01,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1496 transitions. [2021-05-22 02:29:01,733 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1496 transitions. Word has length 21 [2021-05-22 02:29:01,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:01,733 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1496 transitions. [2021-05-22 02:29:01,733 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:01,733 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1496 transitions. [2021-05-22 02:29:01,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:01,734 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:01,734 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:01,934 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 640 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3263 [2021-05-22 02:29:01,934 INFO L430 AbstractCegarLoop]: === Iteration 652 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:01,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:01,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1356275977, now seen corresponding path program 640 times [2021-05-22 02:29:01,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:01,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1708615608] [2021-05-22 02:29:01,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:02,045 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:02,046 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:02,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1708615608] [2021-05-22 02:29:02,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1708615608] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:02,046 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411532625] [2021-05-22 02:29:02,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 641 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 641 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:02,070 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:02,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:02,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:02,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:02,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:02,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:02,120 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:02,130 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:02,133 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:02,133 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:02,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:02,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:02,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:02,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:02,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:02,234 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:02,253 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:02,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:02,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:02,256 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:02,273 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:02,274 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:02,274 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:29:02,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:02,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [411532625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:02,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:02,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:02,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019894880] [2021-05-22 02:29:02,324 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:02,324 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:02,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:02,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:02,324 INFO L87 Difference]: Start difference. First operand 477 states and 1496 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:02,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:02,616 INFO L93 Difference]: Finished difference Result 797 states and 2434 transitions. [2021-05-22 02:29:02,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:29:02,616 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:02,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:02,617 INFO L225 Difference]: With dead ends: 797 [2021-05-22 02:29:02,617 INFO L226 Difference]: Without dead ends: 743 [2021-05-22 02:29:02,618 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 275.5ms TimeCoverageRelationStatistics Valid=81, Invalid=381, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:29:02,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 743 states. [2021-05-22 02:29:02,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 743 to 478. [2021-05-22 02:29:02,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.1635220125786163) internal successors, (1509), 477 states have internal predecessors, (1509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:02,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1509 transitions. [2021-05-22 02:29:02,623 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1509 transitions. Word has length 21 [2021-05-22 02:29:02,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:02,623 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1509 transitions. [2021-05-22 02:29:02,623 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:02,623 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1509 transitions. [2021-05-22 02:29:02,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:02,624 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:02,624 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:02,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 641 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3284 [2021-05-22 02:29:02,824 INFO L430 AbstractCegarLoop]: === Iteration 653 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:02,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:02,824 INFO L82 PathProgramCache]: Analyzing trace with hash 731990213, now seen corresponding path program 641 times [2021-05-22 02:29:02,824 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:02,824 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404212670] [2021-05-22 02:29:02,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:02,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:02,929 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:02,929 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:02,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404212670] [2021-05-22 02:29:02,929 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404212670] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:02,929 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007219101] [2021-05-22 02:29:02,929 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 642 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 642 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:02,954 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:02,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:02,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:02,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:03,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,030 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:03,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:03,035 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,051 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,054 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:03,054 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:03,098 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_167, v_prenex_168], 1=[o_2, o_4]} [2021-05-22 02:29:03,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:03,102 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,117 INFO L518 ElimStorePlain]: Eliminatee v_prenex_168 vanished before elimination [2021-05-22 02:29:03,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:03,121 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:03,138 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,151 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:03,151 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:59, output treesize:21 [2021-05-22 02:29:03,191 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:03,191 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007219101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:03,191 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:03,191 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:03,191 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152114683] [2021-05-22 02:29:03,191 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:03,192 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:03,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:03,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:03,192 INFO L87 Difference]: Start difference. First operand 478 states and 1509 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:03,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:03,368 INFO L93 Difference]: Finished difference Result 617 states and 1911 transitions. [2021-05-22 02:29:03,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:03,368 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:03,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:03,369 INFO L225 Difference]: With dead ends: 617 [2021-05-22 02:29:03,369 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:29:03,369 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 179.0ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:03,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:29:03,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 478. [2021-05-22 02:29:03,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.1635220125786163) internal successors, (1509), 477 states have internal predecessors, (1509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:03,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1509 transitions. [2021-05-22 02:29:03,374 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1509 transitions. Word has length 21 [2021-05-22 02:29:03,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:03,374 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1509 transitions. [2021-05-22 02:29:03,374 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:03,374 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1509 transitions. [2021-05-22 02:29:03,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:03,374 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:03,374 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:03,575 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 642 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3297 [2021-05-22 02:29:03,575 INFO L430 AbstractCegarLoop]: === Iteration 654 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:03,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:03,575 INFO L82 PathProgramCache]: Analyzing trace with hash -259337999, now seen corresponding path program 642 times [2021-05-22 02:29:03,575 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:03,575 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309536153] [2021-05-22 02:29:03,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:03,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:03,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:03,689 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:03,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309536153] [2021-05-22 02:29:03,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309536153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:03,689 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2051076497] [2021-05-22 02:29:03,689 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 643 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 643 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:03,714 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:03,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:03,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:03,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:03,764 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:03,765 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,778 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:03,778 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:03,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,831 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,831 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:03,832 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:03,835 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,857 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,859 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:03,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:03,860 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:03,881 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:03,882 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:03,882 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:81, output treesize:19 [2021-05-22 02:29:03,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:03,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2051076497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:03,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:03,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:03,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851324235] [2021-05-22 02:29:03,960 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:03,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:03,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:03,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:03,960 INFO L87 Difference]: Start difference. First operand 478 states and 1509 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:04,164 INFO L93 Difference]: Finished difference Result 700 states and 2146 transitions. [2021-05-22 02:29:04,165 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:04,165 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:04,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:04,166 INFO L225 Difference]: With dead ends: 700 [2021-05-22 02:29:04,166 INFO L226 Difference]: Without dead ends: 673 [2021-05-22 02:29:04,166 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 252.7ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:04,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-22 02:29:04,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 473. [2021-05-22 02:29:04,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.141949152542373) internal successors, (1483), 472 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1483 transitions. [2021-05-22 02:29:04,171 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1483 transitions. Word has length 21 [2021-05-22 02:29:04,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:04,171 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1483 transitions. [2021-05-22 02:29:04,171 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,171 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1483 transitions. [2021-05-22 02:29:04,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:04,172 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:04,172 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:04,372 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 643 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3304 [2021-05-22 02:29:04,372 INFO L430 AbstractCegarLoop]: === Iteration 655 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:04,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:04,372 INFO L82 PathProgramCache]: Analyzing trace with hash 2128377391, now seen corresponding path program 643 times [2021-05-22 02:29:04,372 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:04,373 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704565313] [2021-05-22 02:29:04,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:04,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:04,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:04,476 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:04,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704565313] [2021-05-22 02:29:04,476 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704565313] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:04,476 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534162254] [2021-05-22 02:29:04,476 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 644 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 644 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:04,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:04,501 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:04,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:04,569 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_169]} [2021-05-22 02:29:04,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:04,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:04,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:04,588 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:04,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:04,589 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:04,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:04,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:04,602 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:29:04,663 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:04,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:04,664 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:04,672 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:04,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:04,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:04,675 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:04,683 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:04,683 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:04,683 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:29:04,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:04,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1534162254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:04,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:04,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:04,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132663337] [2021-05-22 02:29:04,702 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:04,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:04,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:04,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:04,702 INFO L87 Difference]: Start difference. First operand 473 states and 1483 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:04,850 INFO L93 Difference]: Finished difference Result 592 states and 1831 transitions. [2021-05-22 02:29:04,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:04,851 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:04,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:04,851 INFO L225 Difference]: With dead ends: 592 [2021-05-22 02:29:04,851 INFO L226 Difference]: Without dead ends: 570 [2021-05-22 02:29:04,852 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 174.9ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:04,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-05-22 02:29:04,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 476. [2021-05-22 02:29:04,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1473684210526316) internal successors, (1495), 475 states have internal predecessors, (1495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1495 transitions. [2021-05-22 02:29:04,857 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1495 transitions. Word has length 21 [2021-05-22 02:29:04,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:04,857 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1495 transitions. [2021-05-22 02:29:04,857 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:04,857 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1495 transitions. [2021-05-22 02:29:04,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:04,857 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:04,857 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:05,058 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3314,644 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:05,058 INFO L430 AbstractCegarLoop]: === Iteration 656 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:05,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:05,058 INFO L82 PathProgramCache]: Analyzing trace with hash -1541265787, now seen corresponding path program 644 times [2021-05-22 02:29:05,058 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:05,058 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143334822] [2021-05-22 02:29:05,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:05,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:05,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:05,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143334822] [2021-05-22 02:29:05,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143334822] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:05,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635927848] [2021-05-22 02:29:05,135 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 645 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 645 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:05,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:05,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:05,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:05,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:05,215 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:05,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:05,216 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,225 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:05,226 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:05,226 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:29:05,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:05,302 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,304 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:05,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:05,305 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:05,321 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:05,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:05,322 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:05,337 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:05,337 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:29:05,355 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:05,355 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635927848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:05,355 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:05,355 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:05,355 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22555034] [2021-05-22 02:29:05,355 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:05,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:05,355 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:05,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:05,355 INFO L87 Difference]: Start difference. First operand 476 states and 1495 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:05,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:05,536 INFO L93 Difference]: Finished difference Result 585 states and 1801 transitions. [2021-05-22 02:29:05,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:05,536 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:05,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:05,537 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:29:05,537 INFO L226 Difference]: Without dead ends: 558 [2021-05-22 02:29:05,537 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 132.1ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:05,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2021-05-22 02:29:05,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 476. [2021-05-22 02:29:05,541 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.143157894736842) internal successors, (1493), 475 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:05,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1493 transitions. [2021-05-22 02:29:05,542 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1493 transitions. Word has length 21 [2021-05-22 02:29:05,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:05,542 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1493 transitions. [2021-05-22 02:29:05,542 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:05,542 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1493 transitions. [2021-05-22 02:29:05,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:05,542 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:05,542 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:05,743 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 645 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3319 [2021-05-22 02:29:05,743 INFO L430 AbstractCegarLoop]: === Iteration 657 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:05,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:05,743 INFO L82 PathProgramCache]: Analyzing trace with hash -1825528471, now seen corresponding path program 645 times [2021-05-22 02:29:05,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:05,743 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003934789] [2021-05-22 02:29:05,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:05,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:05,830 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:05,830 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:05,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003934789] [2021-05-22 02:29:05,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003934789] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:05,830 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [193281196] [2021-05-22 02:29:05,830 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 646 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 646 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:05,855 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:29:05,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:05,856 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:05,856 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:05,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:05,925 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:05,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:05,928 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:05,945 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:05,947 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:05,947 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:29:06,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:06,042 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:06,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:06,045 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:06,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:06,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:06,060 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,073 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:06,074 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:06,074 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:29:06,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:06,104 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [193281196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:06,104 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:06,104 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:06,104 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821587315] [2021-05-22 02:29:06,105 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:06,105 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:06,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:06,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:06,105 INFO L87 Difference]: Start difference. First operand 476 states and 1493 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:06,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:06,307 INFO L93 Difference]: Finished difference Result 638 states and 1948 transitions. [2021-05-22 02:29:06,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:06,307 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:06,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:06,308 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:29:06,308 INFO L226 Difference]: Without dead ends: 611 [2021-05-22 02:29:06,309 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 194.0ms TimeCoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:06,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-05-22 02:29:06,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 489. [2021-05-22 02:29:06,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.139344262295082) internal successors, (1532), 488 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:06,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1532 transitions. [2021-05-22 02:29:06,313 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1532 transitions. Word has length 21 [2021-05-22 02:29:06,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:06,314 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1532 transitions. [2021-05-22 02:29:06,314 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:06,314 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1532 transitions. [2021-05-22 02:29:06,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:06,314 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:06,314 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:06,514 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 646 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3329 [2021-05-22 02:29:06,515 INFO L430 AbstractCegarLoop]: === Iteration 658 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:06,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:06,515 INFO L82 PathProgramCache]: Analyzing trace with hash -139136631, now seen corresponding path program 646 times [2021-05-22 02:29:06,515 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:06,515 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311492153] [2021-05-22 02:29:06,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:06,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:06,606 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:06,607 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:06,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311492153] [2021-05-22 02:29:06,607 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311492153] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:06,607 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [341181812] [2021-05-22 02:29:06,607 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 647 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 647 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:06,631 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:06,631 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:06,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:06,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:06,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:06,689 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:06,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:06,692 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:06,711 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:06,711 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:29:06,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:06,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:06,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,825 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:06,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:06,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:06,828 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:06,836 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:06,836 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:7 [2021-05-22 02:29:06,852 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:06,853 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [341181812] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:06,853 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:06,853 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:06,853 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093759141] [2021-05-22 02:29:06,853 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:06,853 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:06,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:06,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:06,853 INFO L87 Difference]: Start difference. First operand 489 states and 1532 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:07,046 INFO L93 Difference]: Finished difference Result 567 states and 1741 transitions. [2021-05-22 02:29:07,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:07,046 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:07,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:07,047 INFO L225 Difference]: With dead ends: 567 [2021-05-22 02:29:07,047 INFO L226 Difference]: Without dead ends: 546 [2021-05-22 02:29:07,047 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 192.4ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:07,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-22 02:29:07,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 479. [2021-05-22 02:29:07,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1485355648535567) internal successors, (1505), 478 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1505 transitions. [2021-05-22 02:29:07,052 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1505 transitions. Word has length 21 [2021-05-22 02:29:07,052 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:07,052 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1505 transitions. [2021-05-22 02:29:07,052 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,052 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1505 transitions. [2021-05-22 02:29:07,053 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:07,053 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:07,053 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:07,253 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3348,647 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:07,253 INFO L430 AbstractCegarLoop]: === Iteration 659 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:07,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:07,253 INFO L82 PathProgramCache]: Analyzing trace with hash -116632259, now seen corresponding path program 647 times [2021-05-22 02:29:07,253 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:07,254 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332936054] [2021-05-22 02:29:07,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:07,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:07,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:07,348 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:07,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332936054] [2021-05-22 02:29:07,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332936054] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:07,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [556307275] [2021-05-22 02:29:07,349 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 648 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 648 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:07,373 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:07,373 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:07,374 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:07,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:07,443 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[v_prenex_170]} [2021-05-22 02:29:07,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:07,446 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:07,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:07,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:07,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:07,464 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:07,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:07,478 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:07,478 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:29:07,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:07,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:07,523 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:07,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:07,524 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:07,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:07,542 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:07,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:07,543 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:07,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:07,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:07,559 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:29:07,598 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:07,598 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [556307275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:07,598 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:07,598 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:07,598 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73402723] [2021-05-22 02:29:07,598 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:07,598 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:07,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:07,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:07,599 INFO L87 Difference]: Start difference. First operand 479 states and 1505 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:07,743 INFO L93 Difference]: Finished difference Result 610 states and 1890 transitions. [2021-05-22 02:29:07,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:07,743 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:07,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:07,744 INFO L225 Difference]: With dead ends: 610 [2021-05-22 02:29:07,744 INFO L226 Difference]: Without dead ends: 581 [2021-05-22 02:29:07,744 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 167.6ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:07,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-22 02:29:07,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 479. [2021-05-22 02:29:07,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1485355648535567) internal successors, (1505), 478 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1505 transitions. [2021-05-22 02:29:07,749 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1505 transitions. Word has length 21 [2021-05-22 02:29:07,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:07,749 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1505 transitions. [2021-05-22 02:29:07,749 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:07,749 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1505 transitions. [2021-05-22 02:29:07,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:07,749 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:07,749 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:07,950 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 648 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3361 [2021-05-22 02:29:07,950 INFO L430 AbstractCegarLoop]: === Iteration 660 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:07,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:07,950 INFO L82 PathProgramCache]: Analyzing trace with hash 180634151, now seen corresponding path program 648 times [2021-05-22 02:29:07,950 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:07,950 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660532206] [2021-05-22 02:29:07,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:07,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:08,037 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:08,037 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:08,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660532206] [2021-05-22 02:29:08,037 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660532206] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:08,037 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1705609007] [2021-05-22 02:29:08,037 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 649 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 649 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:08,062 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:29:08,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:08,062 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:08,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:08,108 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:08,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,118 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,119 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:08,119 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:29:08,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:08,167 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:08,170 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,187 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,189 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:08,190 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,207 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:08,207 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:29:08,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:08,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1705609007] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:08,250 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:08,250 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:08,250 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362115811] [2021-05-22 02:29:08,251 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:08,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:08,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:08,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:08,251 INFO L87 Difference]: Start difference. First operand 479 states and 1505 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:08,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:08,417 INFO L93 Difference]: Finished difference Result 575 states and 1776 transitions. [2021-05-22 02:29:08,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:08,417 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:08,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:08,418 INFO L225 Difference]: With dead ends: 575 [2021-05-22 02:29:08,418 INFO L226 Difference]: Without dead ends: 552 [2021-05-22 02:29:08,418 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 151.1ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:08,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2021-05-22 02:29:08,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 478. [2021-05-22 02:29:08,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.157232704402516) internal successors, (1506), 477 states have internal predecessors, (1506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:08,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1506 transitions. [2021-05-22 02:29:08,423 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1506 transitions. Word has length 21 [2021-05-22 02:29:08,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:08,423 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1506 transitions. [2021-05-22 02:29:08,424 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:08,424 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1506 transitions. [2021-05-22 02:29:08,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:08,424 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:08,424 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:08,624 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3368,649 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:08,625 INFO L430 AbstractCegarLoop]: === Iteration 661 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:08,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:08,625 INFO L82 PathProgramCache]: Analyzing trace with hash -103628533, now seen corresponding path program 649 times [2021-05-22 02:29:08,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:08,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250758112] [2021-05-22 02:29:08,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:08,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:08,741 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:08,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:08,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250758112] [2021-05-22 02:29:08,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250758112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:08,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026166036] [2021-05-22 02:29:08,741 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 650 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 650 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:08,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:08,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:08,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:08,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,825 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:08,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:08,829 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,846 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,848 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:08,848 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:29:08,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:08,899 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:08,902 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,918 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,920 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:08,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:08,921 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:08,936 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:08,937 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:08,937 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:71, output treesize:19 [2021-05-22 02:29:09,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:09,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026166036] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:09,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:09,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:09,015 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247041255] [2021-05-22 02:29:09,015 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:09,015 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:09,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:09,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:09,015 INFO L87 Difference]: Start difference. First operand 478 states and 1506 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:09,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:09,284 INFO L93 Difference]: Finished difference Result 683 states and 2092 transitions. [2021-05-22 02:29:09,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:09,284 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:09,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:09,285 INFO L225 Difference]: With dead ends: 683 [2021-05-22 02:29:09,285 INFO L226 Difference]: Without dead ends: 656 [2021-05-22 02:29:09,285 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 271.3ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:09,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 656 states. [2021-05-22 02:29:09,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 656 to 489. [2021-05-22 02:29:09,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1598360655737703) internal successors, (1542), 488 states have internal predecessors, (1542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:09,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1542 transitions. [2021-05-22 02:29:09,290 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1542 transitions. Word has length 21 [2021-05-22 02:29:09,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:09,290 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1542 transitions. [2021-05-22 02:29:09,290 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:09,290 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1542 transitions. [2021-05-22 02:29:09,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:09,291 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:09,291 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:09,491 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3377,650 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:09,491 INFO L430 AbstractCegarLoop]: === Iteration 662 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:09,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:09,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1972061257, now seen corresponding path program 650 times [2021-05-22 02:29:09,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:09,492 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435186637] [2021-05-22 02:29:09,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:09,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:09,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:09,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:09,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435186637] [2021-05-22 02:29:09,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435186637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:09,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641518860] [2021-05-22 02:29:09,609 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 651 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 651 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:09,634 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:09,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:09,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:09,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:09,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:09,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:09,695 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:09,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:09,696 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:09,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:09,716 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:09,716 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:29:09,777 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:09,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:09,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:09,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:09,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:09,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:09,789 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:09,797 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:09,798 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:09,798 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:10 [2021-05-22 02:29:09,844 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:09,844 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641518860] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:09,844 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:09,844 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:09,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2058877994] [2021-05-22 02:29:09,844 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:09,844 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:09,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:09,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:09,844 INFO L87 Difference]: Start difference. First operand 489 states and 1542 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:10,019 INFO L93 Difference]: Finished difference Result 632 states and 1948 transitions. [2021-05-22 02:29:10,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:10,020 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:10,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:10,020 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:29:10,020 INFO L226 Difference]: Without dead ends: 611 [2021-05-22 02:29:10,021 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 217.9ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:10,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-05-22 02:29:10,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 472. [2021-05-22 02:29:10,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.140127388535032) internal successors, (1479), 471 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1479 transitions. [2021-05-22 02:29:10,025 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1479 transitions. Word has length 21 [2021-05-22 02:29:10,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:10,026 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1479 transitions. [2021-05-22 02:29:10,026 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,026 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1479 transitions. [2021-05-22 02:29:10,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:10,026 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:10,026 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:10,226 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3390,651 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:10,227 INFO L430 AbstractCegarLoop]: === Iteration 663 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:10,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:10,227 INFO L82 PathProgramCache]: Analyzing trace with hash 646367623, now seen corresponding path program 651 times [2021-05-22 02:29:10,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:10,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2012190221] [2021-05-22 02:29:10,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:10,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:10,318 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:10,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:10,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2012190221] [2021-05-22 02:29:10,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2012190221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:10,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1748539376] [2021-05-22 02:29:10,319 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 652 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 652 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:10,343 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:10,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:10,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:10,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:10,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:10,416 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:10,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:10,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:10,418 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:10,435 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:10,437 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:10,437 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:10,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:10,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:10,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:10,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:10,568 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:10,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:10,569 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:10,576 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:10,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:10,577 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:29:10,585 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:10,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1748539376] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:10,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:10,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:10,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76999498] [2021-05-22 02:29:10,585 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:10,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:10,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:10,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:10,585 INFO L87 Difference]: Start difference. First operand 472 states and 1479 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:10,741 INFO L93 Difference]: Finished difference Result 564 states and 1745 transitions. [2021-05-22 02:29:10,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:10,741 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:10,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:10,742 INFO L225 Difference]: With dead ends: 564 [2021-05-22 02:29:10,742 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:29:10,742 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 172.5ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:10,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:29:10,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 483. [2021-05-22 02:29:10,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1514522821576763) internal successors, (1519), 482 states have internal predecessors, (1519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1519 transitions. [2021-05-22 02:29:10,747 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1519 transitions. Word has length 21 [2021-05-22 02:29:10,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:10,747 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1519 transitions. [2021-05-22 02:29:10,747 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:10,747 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1519 transitions. [2021-05-22 02:29:10,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:10,748 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:10,748 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:10,948 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 652 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3395 [2021-05-22 02:29:10,948 INFO L430 AbstractCegarLoop]: === Iteration 664 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:10,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:10,948 INFO L82 PathProgramCache]: Analyzing trace with hash 144576287, now seen corresponding path program 652 times [2021-05-22 02:29:10,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:10,948 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380701230] [2021-05-22 02:29:10,948 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:10,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:11,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:11,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:11,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380701230] [2021-05-22 02:29:11,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380701230] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:11,044 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297153613] [2021-05-22 02:29:11,044 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 653 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 653 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:11,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:11,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:11,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:11,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:11,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:11,140 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:11,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,160 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:11,162 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:11,162 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:11,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:11,233 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,242 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:11,244 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:11,245 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,253 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:11,254 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,254 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:29:11,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:11,267 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297153613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:11,267 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:11,267 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:11,267 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [672983684] [2021-05-22 02:29:11,267 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:11,267 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:11,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:11,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:11,268 INFO L87 Difference]: Start difference. First operand 483 states and 1519 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:11,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:11,429 INFO L93 Difference]: Finished difference Result 573 states and 1769 transitions. [2021-05-22 02:29:11,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:11,429 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:11,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:11,430 INFO L225 Difference]: With dead ends: 573 [2021-05-22 02:29:11,430 INFO L226 Difference]: Without dead ends: 551 [2021-05-22 02:29:11,430 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 153.9ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:11,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-05-22 02:29:11,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 480. [2021-05-22 02:29:11,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.1461377870563676) internal successors, (1507), 479 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:11,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1507 transitions. [2021-05-22 02:29:11,435 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1507 transitions. Word has length 21 [2021-05-22 02:29:11,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:11,435 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1507 transitions. [2021-05-22 02:29:11,435 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:11,435 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1507 transitions. [2021-05-22 02:29:11,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:11,436 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:11,436 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:11,636 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3408,653 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:11,636 INFO L430 AbstractCegarLoop]: === Iteration 665 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:11,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:11,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1271691741, now seen corresponding path program 653 times [2021-05-22 02:29:11,636 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:11,636 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828600052] [2021-05-22 02:29:11,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:11,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:11,745 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:11,745 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:11,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828600052] [2021-05-22 02:29:11,746 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828600052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:11,746 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1330717032] [2021-05-22 02:29:11,746 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 654 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 654 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:11,770 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:11,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:11,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:29:11,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:11,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:11,846 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:11,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:11,850 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:11,854 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:11,857 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:11,898 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:11,902 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 4 dim-0 vars, and 4 xjuncts. [2021-05-22 02:29:11,902 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:143, output treesize:95 [2021-05-22 02:29:12,214 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:12,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:12,215 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:12,234 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:12,236 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:12,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:12,237 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:12,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:12,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:12,257 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:29:12,258 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:12,274 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:12,276 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:12,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:29:12,277 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:12,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:12,294 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:12,294 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:77, output treesize:21 [2021-05-22 02:29:12,340 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:12,340 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1330717032] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:12,340 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:12,340 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:12,340 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28514662] [2021-05-22 02:29:12,340 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:12,340 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:12,340 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:12,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:12,341 INFO L87 Difference]: Start difference. First operand 480 states and 1507 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:12,600 WARN L205 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 38 [2021-05-22 02:29:12,967 WARN L205 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 56 [2021-05-22 02:29:13,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:13,060 INFO L93 Difference]: Finished difference Result 740 states and 2266 transitions. [2021-05-22 02:29:13,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:29:13,061 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:13,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:13,062 INFO L225 Difference]: With dead ends: 740 [2021-05-22 02:29:13,062 INFO L226 Difference]: Without dead ends: 702 [2021-05-22 02:29:13,062 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 766.6ms TimeCoverageRelationStatistics Valid=94, Invalid=458, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:29:13,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-05-22 02:29:13,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 486. [2021-05-22 02:29:13,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.154639175257732) internal successors, (1530), 485 states have internal predecessors, (1530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:13,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1530 transitions. [2021-05-22 02:29:13,068 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1530 transitions. Word has length 21 [2021-05-22 02:29:13,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:13,068 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1530 transitions. [2021-05-22 02:29:13,068 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:13,068 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1530 transitions. [2021-05-22 02:29:13,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:13,068 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:13,068 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:13,269 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3414,654 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:13,269 INFO L430 AbstractCegarLoop]: === Iteration 666 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:13,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:13,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1049483129, now seen corresponding path program 654 times [2021-05-22 02:29:13,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:13,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368325304] [2021-05-22 02:29:13,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:13,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:13,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:13,370 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:13,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368325304] [2021-05-22 02:29:13,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368325304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:13,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821266061] [2021-05-22 02:29:13,370 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 655 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 655 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:13,395 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:13,395 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:13,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:13,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:13,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:13,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:13,454 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:13,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:13,471 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:13,472 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:13,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:13,611 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:13,613 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:13,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:13,614 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:13,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:13,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:13,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:13,632 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:13,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:13,647 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:13,647 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:5 [2021-05-22 02:29:13,675 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:13,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821266061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:13,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:13,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:13,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106994692] [2021-05-22 02:29:13,676 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:13,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:13,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:13,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:13,676 INFO L87 Difference]: Start difference. First operand 486 states and 1530 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:13,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:13,923 INFO L93 Difference]: Finished difference Result 761 states and 2328 transitions. [2021-05-22 02:29:13,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:29:13,924 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:13,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:13,925 INFO L225 Difference]: With dead ends: 761 [2021-05-22 02:29:13,925 INFO L226 Difference]: Without dead ends: 701 [2021-05-22 02:29:13,925 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 215.7ms TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:13,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2021-05-22 02:29:13,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 486. [2021-05-22 02:29:13,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.1443298969072164) internal successors, (1525), 485 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:13,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1525 transitions. [2021-05-22 02:29:13,930 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1525 transitions. Word has length 21 [2021-05-22 02:29:13,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:13,930 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1525 transitions. [2021-05-22 02:29:13,930 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:13,930 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1525 transitions. [2021-05-22 02:29:13,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:13,931 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:13,931 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:14,131 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3441,655 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:14,131 INFO L430 AbstractCegarLoop]: === Iteration 667 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:14,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:14,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1336883715, now seen corresponding path program 655 times [2021-05-22 02:29:14,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:14,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [451559638] [2021-05-22 02:29:14,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:14,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:14,240 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:14,240 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:14,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [451559638] [2021-05-22 02:29:14,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [451559638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:14,241 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92271386] [2021-05-22 02:29:14,241 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 656 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 656 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:14,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:14,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:14,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:14,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:14,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:14,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:14,350 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:14,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:14,353 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:14,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:14,372 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:14,373 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:14,538 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_181, v_prenex_182], 1=[o_2, o_4]} [2021-05-22 02:29:14,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:14,542 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:14,554 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:14,555 INFO L518 ElimStorePlain]: Eliminatee v_prenex_182 vanished before elimination [2021-05-22 02:29:14,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:14,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:14,557 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:14,568 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:14,570 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:14,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:14,571 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:14,581 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:14,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:14,583 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:51, output treesize:13 [2021-05-22 02:29:14,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:14,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92271386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:14,630 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:14,630 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:14,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714619186] [2021-05-22 02:29:14,630 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:14,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:14,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:14,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:14,631 INFO L87 Difference]: Start difference. First operand 486 states and 1525 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:14,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:14,845 INFO L93 Difference]: Finished difference Result 700 states and 2176 transitions. [2021-05-22 02:29:14,845 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:14,845 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:14,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:14,846 INFO L225 Difference]: With dead ends: 700 [2021-05-22 02:29:14,846 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:29:14,847 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 257.7ms TimeCoverageRelationStatistics Valid=63, Invalid=317, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:14,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:29:14,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 484. [2021-05-22 02:29:14,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1469979296066253) internal successors, (1520), 483 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:14,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1520 transitions. [2021-05-22 02:29:14,852 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1520 transitions. Word has length 21 [2021-05-22 02:29:14,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:14,852 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1520 transitions. [2021-05-22 02:29:14,852 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:14,852 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1520 transitions. [2021-05-22 02:29:14,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:14,853 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:14,853 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:15,053 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3457,656 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:15,053 INFO L430 AbstractCegarLoop]: === Iteration 668 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:15,053 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:15,053 INFO L82 PathProgramCache]: Analyzing trace with hash 959955199, now seen corresponding path program 656 times [2021-05-22 02:29:15,053 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:15,053 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843861873] [2021-05-22 02:29:15,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:15,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:15,167 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:15,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:15,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843861873] [2021-05-22 02:29:15,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843861873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:15,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930605835] [2021-05-22 02:29:15,168 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 657 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 657 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:15,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:15,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:15,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:15,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:15,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:15,268 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:15,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:15,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:15,271 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:15,286 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:15,289 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:15,289 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:29:15,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:15,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:15,375 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:15,382 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:15,384 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:15,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:15,385 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:15,391 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:15,392 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:15,392 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:29:15,435 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:15,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930605835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:15,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:15,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:15,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851869489] [2021-05-22 02:29:15,436 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:15,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:15,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:15,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:15,436 INFO L87 Difference]: Start difference. First operand 484 states and 1520 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:15,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:15,635 INFO L93 Difference]: Finished difference Result 669 states and 2069 transitions. [2021-05-22 02:29:15,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:15,635 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:15,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:15,636 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:29:15,636 INFO L226 Difference]: Without dead ends: 650 [2021-05-22 02:29:15,636 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 233.1ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:15,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2021-05-22 02:29:15,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 480. [2021-05-22 02:29:15,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.139874739039666) internal successors, (1504), 479 states have internal predecessors, (1504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:15,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1504 transitions. [2021-05-22 02:29:15,641 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1504 transitions. Word has length 21 [2021-05-22 02:29:15,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:15,641 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1504 transitions. [2021-05-22 02:29:15,641 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:15,641 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1504 transitions. [2021-05-22 02:29:15,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:15,642 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:15,642 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:15,842 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 657 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3483 [2021-05-22 02:29:15,842 INFO L430 AbstractCegarLoop]: === Iteration 669 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:15,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:15,843 INFO L82 PathProgramCache]: Analyzing trace with hash -769006689, now seen corresponding path program 657 times [2021-05-22 02:29:15,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:15,843 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457618072] [2021-05-22 02:29:15,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:15,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:15,936 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:15,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:15,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457618072] [2021-05-22 02:29:15,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457618072] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:15,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500858242] [2021-05-22 02:29:15,936 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 658 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 658 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:15,961 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:15,962 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:15,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:15,962 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:16,031 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,032 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:16,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:16,036 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,052 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,055 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:16,055 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:16,162 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_183, v_prenex_184], 1=[o_2, o_4]} [2021-05-22 02:29:16,165 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:16,165 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,178 INFO L518 ElimStorePlain]: Eliminatee v_prenex_184 vanished before elimination [2021-05-22 02:29:16,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:16,181 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,192 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:16,195 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,206 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:16,206 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:51, output treesize:15 [2021-05-22 02:29:16,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:16,233 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500858242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:16,233 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:16,233 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:16,233 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1296397058] [2021-05-22 02:29:16,233 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:16,233 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:16,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:16,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:16,233 INFO L87 Difference]: Start difference. First operand 480 states and 1504 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:16,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:16,408 INFO L93 Difference]: Finished difference Result 609 states and 1884 transitions. [2021-05-22 02:29:16,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:16,408 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:16,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:16,409 INFO L225 Difference]: With dead ends: 609 [2021-05-22 02:29:16,409 INFO L226 Difference]: Without dead ends: 580 [2021-05-22 02:29:16,409 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 166.8ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:16,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-22 02:29:16,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 480. [2021-05-22 02:29:16,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.139874739039666) internal successors, (1504), 479 states have internal predecessors, (1504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:16,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1504 transitions. [2021-05-22 02:29:16,414 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1504 transitions. Word has length 21 [2021-05-22 02:29:16,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:16,414 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1504 transitions. [2021-05-22 02:29:16,414 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:16,414 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1504 transitions. [2021-05-22 02:29:16,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:16,415 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:16,415 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:16,615 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3488,658 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:16,615 INFO L430 AbstractCegarLoop]: === Iteration 670 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:16,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:16,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1863705607, now seen corresponding path program 658 times [2021-05-22 02:29:16,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:16,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678939258] [2021-05-22 02:29:16,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:16,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:16,726 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:16,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:16,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678939258] [2021-05-22 02:29:16,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678939258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:16,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900227389] [2021-05-22 02:29:16,727 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 659 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 659 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:16,752 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:16,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:16,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:16,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:16,803 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:16,804 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:16,816 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:43, output treesize:36 [2021-05-22 02:29:16,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:16,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:16,932 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,948 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,950 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:16,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:16,951 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:16,965 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:16,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:16,966 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:13 [2021-05-22 02:29:17,016 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:17,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900227389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:17,016 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:17,016 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:17,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813904405] [2021-05-22 02:29:17,016 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:17,016 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:17,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:17,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:17,016 INFO L87 Difference]: Start difference. First operand 480 states and 1504 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:17,286 INFO L93 Difference]: Finished difference Result 802 states and 2449 transitions. [2021-05-22 02:29:17,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:29:17,287 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:17,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:17,288 INFO L225 Difference]: With dead ends: 802 [2021-05-22 02:29:17,288 INFO L226 Difference]: Without dead ends: 748 [2021-05-22 02:29:17,288 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 273.6ms TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:29:17,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-05-22 02:29:17,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 481. [2021-05-22 02:29:17,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.160416666666667) internal successors, (1517), 480 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1517 transitions. [2021-05-22 02:29:17,293 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1517 transitions. Word has length 21 [2021-05-22 02:29:17,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:17,293 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1517 transitions. [2021-05-22 02:29:17,293 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,293 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1517 transitions. [2021-05-22 02:29:17,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:17,294 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:17,294 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:17,494 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 659 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3507 [2021-05-22 02:29:17,494 INFO L430 AbstractCegarLoop]: === Iteration 671 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:17,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:17,495 INFO L82 PathProgramCache]: Analyzing trace with hash 1806975925, now seen corresponding path program 659 times [2021-05-22 02:29:17,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:17,495 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1914526561] [2021-05-22 02:29:17,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:17,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:17,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:17,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:17,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1914526561] [2021-05-22 02:29:17,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1914526561] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:17,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1089490626] [2021-05-22 02:29:17,588 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 660 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 660 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:17,613 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:17,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:17,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:17,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:17,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:17,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:17,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:17,684 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:17,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:17,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:17,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:17,706 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:17,706 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:65, output treesize:41 [2021-05-22 02:29:17,747 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_185, v_prenex_186], 1=[o_2, o_4]} [2021-05-22 02:29:17,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:17,751 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:17,766 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:17,766 INFO L518 ElimStorePlain]: Eliminatee v_prenex_186 vanished before elimination [2021-05-22 02:29:17,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:17,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:17,769 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:17,782 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:17,784 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:17,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:17,784 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:17,797 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:17,798 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:17,798 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:59, output treesize:24 [2021-05-22 02:29:17,832 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:17,832 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1089490626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:17,832 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:17,832 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:17,832 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060506434] [2021-05-22 02:29:17,832 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:17,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:17,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:17,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:17,833 INFO L87 Difference]: Start difference. First operand 481 states and 1517 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:17,990 INFO L93 Difference]: Finished difference Result 617 states and 1914 transitions. [2021-05-22 02:29:17,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:17,990 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:17,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:17,991 INFO L225 Difference]: With dead ends: 617 [2021-05-22 02:29:17,991 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:29:17,991 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 149.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:17,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:29:17,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 481. [2021-05-22 02:29:17,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.160416666666667) internal successors, (1517), 480 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1517 transitions. [2021-05-22 02:29:17,996 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1517 transitions. Word has length 21 [2021-05-22 02:29:17,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:17,996 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1517 transitions. [2021-05-22 02:29:17,996 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:17,996 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1517 transitions. [2021-05-22 02:29:17,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:17,996 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:17,996 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:18,197 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3522,660 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:18,197 INFO L430 AbstractCegarLoop]: === Iteration 672 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:18,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:18,197 INFO L82 PathProgramCache]: Analyzing trace with hash 2104242335, now seen corresponding path program 660 times [2021-05-22 02:29:18,197 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:18,197 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1979825399] [2021-05-22 02:29:18,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:18,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:18,307 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:18,307 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:18,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1979825399] [2021-05-22 02:29:18,307 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1979825399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:18,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241973178] [2021-05-22 02:29:18,307 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 661 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 661 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:18,332 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:18,332 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:18,333 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:18,333 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:18,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:18,410 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:18,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:18,411 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:18,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:18,414 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:18,437 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:18,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:18,440 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:62, output treesize:38 [2021-05-22 02:29:18,495 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4], 1=[v_prenex_187, v_prenex_188]} [2021-05-22 02:29:18,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:18,499 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:18,515 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:18,516 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:18,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:18,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:18,519 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:18,531 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:18,533 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:18,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:18,534 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:18,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:18,546 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:18,546 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 6 variables, input treesize:56, output treesize:19 [2021-05-22 02:29:18,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:18,570 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241973178] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:18,570 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:18,570 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:29:18,570 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891718474] [2021-05-22 02:29:18,570 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:29:18,570 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:18,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:29:18,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:18,570 INFO L87 Difference]: Start difference. First operand 481 states and 1517 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:18,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:18,724 INFO L93 Difference]: Finished difference Result 624 states and 1930 transitions. [2021-05-22 02:29:18,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:18,725 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:18,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:18,725 INFO L225 Difference]: With dead ends: 624 [2021-05-22 02:29:18,725 INFO L226 Difference]: Without dead ends: 601 [2021-05-22 02:29:18,726 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 180.0ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:18,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-05-22 02:29:18,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 481. [2021-05-22 02:29:18,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.160416666666667) internal successors, (1517), 480 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:18,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1517 transitions. [2021-05-22 02:29:18,734 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1517 transitions. Word has length 21 [2021-05-22 02:29:18,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:18,734 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1517 transitions. [2021-05-22 02:29:18,734 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:18,734 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1517 transitions. [2021-05-22 02:29:18,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:18,734 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:18,734 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:18,935 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3531,661 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:18,935 INFO L430 AbstractCegarLoop]: === Iteration 673 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:18,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:18,935 INFO L82 PathProgramCache]: Analyzing trace with hash 815647713, now seen corresponding path program 661 times [2021-05-22 02:29:18,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:18,935 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801957906] [2021-05-22 02:29:18,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:18,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:19,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:19,043 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:19,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801957906] [2021-05-22 02:29:19,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801957906] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:19,043 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [297611690] [2021-05-22 02:29:19,043 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 662 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 662 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:19,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:19,068 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:19,068 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:19,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:19,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,143 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:19,143 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 3 variables, input treesize:46, output treesize:39 [2021-05-22 02:29:19,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,188 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:19,189 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:19,192 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,216 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:19,217 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,238 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,239 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:19,239 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:81, output treesize:25 [2021-05-22 02:29:19,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:19,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [297611690] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:19,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:19,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:19,314 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110961533] [2021-05-22 02:29:19,314 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:19,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:19,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:19,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:19,314 INFO L87 Difference]: Start difference. First operand 481 states and 1517 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:19,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:19,500 INFO L93 Difference]: Finished difference Result 701 states and 2149 transitions. [2021-05-22 02:29:19,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:19,501 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:19,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:19,502 INFO L225 Difference]: With dead ends: 701 [2021-05-22 02:29:19,502 INFO L226 Difference]: Without dead ends: 674 [2021-05-22 02:29:19,502 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 237.6ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:19,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-22 02:29:19,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 476. [2021-05-22 02:29:19,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1389473684210527) internal successors, (1491), 475 states have internal predecessors, (1491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:19,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1491 transitions. [2021-05-22 02:29:19,507 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1491 transitions. Word has length 21 [2021-05-22 02:29:19,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:19,507 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1491 transitions. [2021-05-22 02:29:19,507 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:19,507 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1491 transitions. [2021-05-22 02:29:19,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:19,507 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:19,507 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:19,708 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 662 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3539 [2021-05-22 02:29:19,708 INFO L430 AbstractCegarLoop]: === Iteration 674 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:19,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:19,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1019504985, now seen corresponding path program 662 times [2021-05-22 02:29:19,708 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:19,708 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2072698499] [2021-05-22 02:29:19,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:19,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:19,818 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:19,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2072698499] [2021-05-22 02:29:19,818 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2072698499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:19,818 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243082961] [2021-05-22 02:29:19,818 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 663 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 663 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:19,843 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:19,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:19,843 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:19,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:19,941 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:19,942 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,948 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,949 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:19,949 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:29:19,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:19,976 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:19,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:19,986 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:19,993 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:19,993 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:29:20,005 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:20,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [243082961] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:20,006 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:20,006 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:20,006 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254095283] [2021-05-22 02:29:20,006 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:20,006 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:20,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:20,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:20,006 INFO L87 Difference]: Start difference. First operand 476 states and 1491 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:20,150 INFO L93 Difference]: Finished difference Result 557 states and 1723 transitions. [2021-05-22 02:29:20,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:20,151 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:20,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:20,151 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:29:20,151 INFO L226 Difference]: Without dead ends: 538 [2021-05-22 02:29:20,152 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 170.9ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:20,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2021-05-22 02:29:20,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 476. [2021-05-22 02:29:20,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1389473684210527) internal successors, (1491), 475 states have internal predecessors, (1491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1491 transitions. [2021-05-22 02:29:20,156 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1491 transitions. Word has length 21 [2021-05-22 02:29:20,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:20,156 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1491 transitions. [2021-05-22 02:29:20,156 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,156 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1491 transitions. [2021-05-22 02:29:20,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:20,157 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:20,157 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:20,357 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3549,663 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:20,357 INFO L430 AbstractCegarLoop]: === Iteration 675 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:20,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:20,357 INFO L82 PathProgramCache]: Analyzing trace with hash 1217251335, now seen corresponding path program 663 times [2021-05-22 02:29:20,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:20,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [108393104] [2021-05-22 02:29:20,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:20,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:20,453 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:20,453 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:20,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [108393104] [2021-05-22 02:29:20,453 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [108393104] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:20,453 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [480948449] [2021-05-22 02:29:20,453 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 664 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 664 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:20,478 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:20,478 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:20,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:20,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:20,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:20,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:20,559 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:20,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:20,567 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:20,567 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:29:20,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:29:20,612 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:20,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:20,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:29:20,615 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:20,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:20,631 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:20,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:20,632 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:20,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:20,646 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:20,646 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:15 [2021-05-22 02:29:20,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:20,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [480948449] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:20,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:20,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:20,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823811037] [2021-05-22 02:29:20,664 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:20,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:20,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:20,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:20,664 INFO L87 Difference]: Start difference. First operand 476 states and 1491 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:20,813 INFO L93 Difference]: Finished difference Result 578 states and 1785 transitions. [2021-05-22 02:29:20,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:20,813 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:20,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:20,814 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:29:20,814 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:29:20,814 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 148.3ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:20,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:29:20,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 476. [2021-05-22 02:29:20,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1389473684210527) internal successors, (1491), 475 states have internal predecessors, (1491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1491 transitions. [2021-05-22 02:29:20,819 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1491 transitions. Word has length 21 [2021-05-22 02:29:20,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:20,819 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1491 transitions. [2021-05-22 02:29:20,819 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:20,819 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1491 transitions. [2021-05-22 02:29:20,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:20,820 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:20,820 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:21,020 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3552,664 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:21,020 INFO L430 AbstractCegarLoop]: === Iteration 676 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:21,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:21,020 INFO L82 PathProgramCache]: Analyzing trace with hash 122552417, now seen corresponding path program 664 times [2021-05-22 02:29:21,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:21,020 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1390589246] [2021-05-22 02:29:21,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:21,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:21,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:21,141 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:21,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1390589246] [2021-05-22 02:29:21,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1390589246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:21,141 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857433220] [2021-05-22 02:29:21,141 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 665 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 665 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:21,168 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:21,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:21,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:21,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:21,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:21,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:21,263 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:21,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:21,264 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:21,275 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:21,277 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:21,277 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:32 [2021-05-22 02:29:21,317 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:21,318 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:21,320 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:21,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:21,321 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:21,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:21,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:21,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:21,336 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:21,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:21,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:21,349 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:60, output treesize:13 [2021-05-22 02:29:21,393 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:21,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857433220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:21,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:21,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:21,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83506244] [2021-05-22 02:29:21,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:21,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:21,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:21,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:21,394 INFO L87 Difference]: Start difference. First operand 476 states and 1491 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:21,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:21,587 INFO L93 Difference]: Finished difference Result 619 states and 1904 transitions. [2021-05-22 02:29:21,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:21,588 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:21,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:21,589 INFO L225 Difference]: With dead ends: 619 [2021-05-22 02:29:21,589 INFO L226 Difference]: Without dead ends: 592 [2021-05-22 02:29:21,589 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 200.6ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:21,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-22 02:29:21,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 491. [2021-05-22 02:29:21,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.136734693877551) internal successors, (1537), 490 states have internal predecessors, (1537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:21,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1537 transitions. [2021-05-22 02:29:21,596 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1537 transitions. Word has length 21 [2021-05-22 02:29:21,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:21,596 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1537 transitions. [2021-05-22 02:29:21,596 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:21,596 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1537 transitions. [2021-05-22 02:29:21,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:21,597 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:21,597 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:21,808 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 665 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3562 [2021-05-22 02:29:21,809 INFO L430 AbstractCegarLoop]: === Iteration 677 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:21,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:21,809 INFO L82 PathProgramCache]: Analyzing trace with hash 2003305355, now seen corresponding path program 665 times [2021-05-22 02:29:21,809 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:21,809 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635440420] [2021-05-22 02:29:21,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:21,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:21,910 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:21,910 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:21,910 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635440420] [2021-05-22 02:29:21,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635440420] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:21,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052403027] [2021-05-22 02:29:21,911 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 666 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 666 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:21,935 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:21,936 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:21,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:29:21,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:22,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:22,026 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:22,029 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,041 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:22,042 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:22,042 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:32 [2021-05-22 02:29:22,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:22,111 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:22,115 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,144 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:22,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,148 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:22,149 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:22,152 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:22,180 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:22,180 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:81, output treesize:25 [2021-05-22 02:29:22,246 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:22,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052403027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:22,246 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:22,246 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:22,246 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656727583] [2021-05-22 02:29:22,246 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:22,246 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:22,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:22,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:22,247 INFO L87 Difference]: Start difference. First operand 491 states and 1537 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:22,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:22,531 INFO L93 Difference]: Finished difference Result 569 states and 1751 transitions. [2021-05-22 02:29:22,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:22,532 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:22,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:22,533 INFO L225 Difference]: With dead ends: 569 [2021-05-22 02:29:22,533 INFO L226 Difference]: Without dead ends: 548 [2021-05-22 02:29:22,533 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 260.9ms TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:22,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-05-22 02:29:22,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 473. [2021-05-22 02:29:22,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.141949152542373) internal successors, (1483), 472 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:22,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1483 transitions. [2021-05-22 02:29:22,540 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1483 transitions. Word has length 21 [2021-05-22 02:29:22,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:22,540 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1483 transitions. [2021-05-22 02:29:22,540 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:22,540 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1483 transitions. [2021-05-22 02:29:22,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:22,541 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:22,541 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:22,741 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3576,666 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:22,741 INFO L430 AbstractCegarLoop]: === Iteration 678 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:22,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:22,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1639368899, now seen corresponding path program 666 times [2021-05-22 02:29:22,742 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:22,742 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273282994] [2021-05-22 02:29:22,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:22,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:22,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:22,823 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:22,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273282994] [2021-05-22 02:29:22,823 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273282994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:22,823 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493060786] [2021-05-22 02:29:22,823 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 667 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 667 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:22,866 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:22,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:22,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:22,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:22,915 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:22,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,924 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:22,926 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:22,926 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:33 [2021-05-22 02:29:22,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:29:22,975 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,977 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:29:22,978 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:22,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:22,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:22,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:22,999 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,016 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:23,017 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:23,017 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:24 [2021-05-22 02:29:23,051 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:23,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493060786] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:23,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:23,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:23,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830644290] [2021-05-22 02:29:23,052 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:23,052 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:23,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:23,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:23,052 INFO L87 Difference]: Start difference. First operand 473 states and 1483 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:23,214 INFO L93 Difference]: Finished difference Result 593 states and 1825 transitions. [2021-05-22 02:29:23,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:23,214 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:23,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:23,215 INFO L225 Difference]: With dead ends: 593 [2021-05-22 02:29:23,215 INFO L226 Difference]: Without dead ends: 557 [2021-05-22 02:29:23,215 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 133.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:23,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2021-05-22 02:29:23,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 474. [2021-05-22 02:29:23,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.145877378435518) internal successors, (1488), 473 states have internal predecessors, (1488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1488 transitions. [2021-05-22 02:29:23,220 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1488 transitions. Word has length 21 [2021-05-22 02:29:23,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:23,220 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1488 transitions. [2021-05-22 02:29:23,220 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,220 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1488 transitions. [2021-05-22 02:29:23,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:23,221 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:23,221 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:23,421 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3586,667 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:23,421 INFO L430 AbstractCegarLoop]: === Iteration 679 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:23,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:23,422 INFO L82 PathProgramCache]: Analyzing trace with hash -1342102489, now seen corresponding path program 667 times [2021-05-22 02:29:23,422 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:23,422 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1061911722] [2021-05-22 02:29:23,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:23,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:23,514 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:23,514 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:23,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1061911722] [2021-05-22 02:29:23,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1061911722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:23,515 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [635998925] [2021-05-22 02:29:23,515 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 668 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 668 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:23,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:23,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:23,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:23,607 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_189]} [2021-05-22 02:29:23,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:23,611 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:23,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:23,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:23,627 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:23,640 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:23,640 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:29:23,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:23,683 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:23,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:23,686 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,701 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:23,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:23,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:23,704 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:23,718 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:23,719 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:23,719 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:64, output treesize:19 [2021-05-22 02:29:23,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:23,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [635998925] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:23,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:23,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:29:23,754 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107006620] [2021-05-22 02:29:23,754 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:29:23,754 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:23,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:29:23,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:23,754 INFO L87 Difference]: Start difference. First operand 474 states and 1488 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:23,907 INFO L93 Difference]: Finished difference Result 678 states and 2077 transitions. [2021-05-22 02:29:23,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:23,907 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:23,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:23,908 INFO L225 Difference]: With dead ends: 678 [2021-05-22 02:29:23,908 INFO L226 Difference]: Without dead ends: 655 [2021-05-22 02:29:23,908 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 157.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:23,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 655 states. [2021-05-22 02:29:23,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 655 to 489. [2021-05-22 02:29:23,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1618852459016393) internal successors, (1543), 488 states have internal predecessors, (1543), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1543 transitions. [2021-05-22 02:29:23,919 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1543 transitions. Word has length 21 [2021-05-22 02:29:23,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:23,919 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1543 transitions. [2021-05-22 02:29:23,919 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:23,919 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1543 transitions. [2021-05-22 02:29:23,920 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:23,920 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:23,920 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:24,120 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 668 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3592 [2021-05-22 02:29:24,121 INFO L430 AbstractCegarLoop]: === Iteration 680 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:24,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:24,121 INFO L82 PathProgramCache]: Analyzing trace with hash -1626365173, now seen corresponding path program 668 times [2021-05-22 02:29:24,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:24,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555882172] [2021-05-22 02:29:24,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:24,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:24,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:24,237 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:24,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555882172] [2021-05-22 02:29:24,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555882172] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:24,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [828324587] [2021-05-22 02:29:24,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 669 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 669 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:24,262 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:24,262 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:24,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:24,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:24,317 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:24,318 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:24,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:24,319 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:24,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:24,322 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:24,336 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:24,338 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:24,338 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:29:24,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:24,385 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:24,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:24,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:24,388 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:24,403 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:24,405 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:24,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:24,406 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:24,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:24,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:24,421 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:70, output treesize:19 [2021-05-22 02:29:24,496 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:24,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [828324587] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:24,496 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:24,496 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:24,496 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [773042501] [2021-05-22 02:29:24,496 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:24,496 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:24,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:24,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:24,497 INFO L87 Difference]: Start difference. First operand 489 states and 1543 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:24,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:24,689 INFO L93 Difference]: Finished difference Result 723 states and 2212 transitions. [2021-05-22 02:29:24,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:24,689 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:24,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:24,690 INFO L225 Difference]: With dead ends: 723 [2021-05-22 02:29:24,690 INFO L226 Difference]: Without dead ends: 696 [2021-05-22 02:29:24,690 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 261.3ms TimeCoverageRelationStatistics Valid=81, Invalid=339, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:24,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2021-05-22 02:29:24,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 507. [2021-05-22 02:29:24,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.1679841897233203) internal successors, (1603), 506 states have internal predecessors, (1603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:24,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1603 transitions. [2021-05-22 02:29:24,696 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1603 transitions. Word has length 21 [2021-05-22 02:29:24,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:24,696 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1603 transitions. [2021-05-22 02:29:24,696 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:24,696 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1603 transitions. [2021-05-22 02:29:24,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:24,697 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:24,697 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:24,897 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 669 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3600 [2021-05-22 02:29:24,897 INFO L430 AbstractCegarLoop]: === Iteration 681 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:24,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:24,897 INFO L82 PathProgramCache]: Analyzing trace with hash 707855157, now seen corresponding path program 669 times [2021-05-22 02:29:24,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:24,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124639631] [2021-05-22 02:29:24,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:24,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:25,036 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:25,036 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:25,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124639631] [2021-05-22 02:29:25,036 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124639631] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:25,036 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099649557] [2021-05-22 02:29:25,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 670 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 670 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:25,062 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:25,062 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:25,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:25,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:25,132 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_190]} [2021-05-22 02:29:25,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:25,135 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:25,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:25,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:25,152 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,165 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:25,166 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:25,166 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:29:25,222 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:25,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:25,223 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,231 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:25,233 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:25,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:25,233 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:25,241 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,241 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:29:25,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:25,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2099649557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:25,288 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:25,288 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:25,288 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385036943] [2021-05-22 02:29:25,288 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:25,288 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:25,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:25,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:25,288 INFO L87 Difference]: Start difference. First operand 507 states and 1603 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:25,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:25,506 INFO L93 Difference]: Finished difference Result 699 states and 2157 transitions. [2021-05-22 02:29:25,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:29:25,506 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:25,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:25,507 INFO L225 Difference]: With dead ends: 699 [2021-05-22 02:29:25,507 INFO L226 Difference]: Without dead ends: 680 [2021-05-22 02:29:25,507 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 272.3ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:25,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-05-22 02:29:25,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 493. [2021-05-22 02:29:25,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.158536585365854) internal successors, (1554), 492 states have internal predecessors, (1554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:25,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1554 transitions. [2021-05-22 02:29:25,513 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1554 transitions. Word has length 21 [2021-05-22 02:29:25,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:25,513 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1554 transitions. [2021-05-22 02:29:25,513 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:25,513 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1554 transitions. [2021-05-22 02:29:25,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:25,513 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:25,513 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:25,714 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3612,670 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:25,714 INFO L430 AbstractCegarLoop]: === Iteration 682 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:25,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:25,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1253227811, now seen corresponding path program 670 times [2021-05-22 02:29:25,714 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:25,714 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356783087] [2021-05-22 02:29:25,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:25,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:25,815 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:25,816 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:25,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356783087] [2021-05-22 02:29:25,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356783087] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:25,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358118360] [2021-05-22 02:29:25,816 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 671 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 671 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:25,841 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:25,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:25,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:25,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:25,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:25,898 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:25,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:25,899 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:25,902 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:25,917 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:25,919 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:25,919 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:29:26,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:26,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:26,049 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,056 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:26,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:26,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:26,058 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:26,065 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,065 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:35, output treesize:7 [2021-05-22 02:29:26,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:26,075 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [358118360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:26,075 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:26,075 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:26,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278861289] [2021-05-22 02:29:26,075 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:26,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:26,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:26,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:26,075 INFO L87 Difference]: Start difference. First operand 493 states and 1554 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:26,209 INFO L93 Difference]: Finished difference Result 600 states and 1840 transitions. [2021-05-22 02:29:26,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:26,209 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:26,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:26,210 INFO L225 Difference]: With dead ends: 600 [2021-05-22 02:29:26,210 INFO L226 Difference]: Without dead ends: 579 [2021-05-22 02:29:26,210 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 217.0ms TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:26,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-05-22 02:29:26,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 489. [2021-05-22 02:29:26,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1598360655737703) internal successors, (1542), 488 states have internal predecessors, (1542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1542 transitions. [2021-05-22 02:29:26,215 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1542 transitions. Word has length 21 [2021-05-22 02:29:26,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:26,215 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1542 transitions. [2021-05-22 02:29:26,215 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,215 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1542 transitions. [2021-05-22 02:29:26,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:26,216 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:26,216 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:26,416 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3617,671 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:26,416 INFO L430 AbstractCegarLoop]: === Iteration 683 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:26,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:26,416 INFO L82 PathProgramCache]: Analyzing trace with hash -465756871, now seen corresponding path program 671 times [2021-05-22 02:29:26,416 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:26,416 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635898056] [2021-05-22 02:29:26,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:26,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:26,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:26,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:26,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635898056] [2021-05-22 02:29:26,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635898056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:26,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529195315] [2021-05-22 02:29:26,507 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 672 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 672 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:26,532 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:26,532 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:26,532 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:26,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:26,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:26,589 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:26,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:26,591 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,606 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:26,608 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:26,608 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:29:26,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:26,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:26,669 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,676 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:26,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:26,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:26,679 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,685 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:26,686 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:26,686 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:10 [2021-05-22 02:29:26,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:26,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529195315] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:26,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:26,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:26,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524431982] [2021-05-22 02:29:26,732 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:26,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:26,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:26,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:26,732 INFO L87 Difference]: Start difference. First operand 489 states and 1542 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:26,908 INFO L93 Difference]: Finished difference Result 638 states and 1965 transitions. [2021-05-22 02:29:26,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:26,909 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:26,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:26,910 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:29:26,910 INFO L226 Difference]: Without dead ends: 617 [2021-05-22 02:29:26,910 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 200.0ms TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:26,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2021-05-22 02:29:26,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 472. [2021-05-22 02:29:26,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.140127388535032) internal successors, (1479), 471 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1479 transitions. [2021-05-22 02:29:26,915 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1479 transitions. Word has length 21 [2021-05-22 02:29:26,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:26,915 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1479 transitions. [2021-05-22 02:29:26,915 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:26,915 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1479 transitions. [2021-05-22 02:29:26,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:26,915 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:26,915 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:27,116 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3631,672 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:27,116 INFO L430 AbstractCegarLoop]: === Iteration 684 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:27,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:27,116 INFO L82 PathProgramCache]: Analyzing trace with hash -1629097049, now seen corresponding path program 672 times [2021-05-22 02:29:27,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:27,116 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [73120776] [2021-05-22 02:29:27,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:27,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:27,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:27,198 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:27,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [73120776] [2021-05-22 02:29:27,198 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [73120776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:27,198 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495526198] [2021-05-22 02:29:27,198 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 673 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 673 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:27,223 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:27,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:27,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:27,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:27,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:27,286 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:27,289 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,302 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:27,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:27,303 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:29:27,364 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:27,366 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,374 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:27,376 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:27,377 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,384 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:27,385 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,386 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:12 [2021-05-22 02:29:27,399 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:27,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495526198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:27,399 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:27,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:27,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386262853] [2021-05-22 02:29:27,399 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:27,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:27,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:27,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:27,399 INFO L87 Difference]: Start difference. First operand 472 states and 1479 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:27,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:27,547 INFO L93 Difference]: Finished difference Result 557 states and 1724 transitions. [2021-05-22 02:29:27,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:27,547 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:27,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:27,548 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:29:27,548 INFO L226 Difference]: Without dead ends: 535 [2021-05-22 02:29:27,548 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 140.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:27,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-22 02:29:27,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 478. [2021-05-22 02:29:27,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.1446540880503147) internal successors, (1500), 477 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:27,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1500 transitions. [2021-05-22 02:29:27,553 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1500 transitions. Word has length 21 [2021-05-22 02:29:27,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:27,553 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1500 transitions. [2021-05-22 02:29:27,553 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:27,553 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1500 transitions. [2021-05-22 02:29:27,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:27,554 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:27,554 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:27,754 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3635,673 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:27,754 INFO L430 AbstractCegarLoop]: === Iteration 685 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:27,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:27,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1003772931, now seen corresponding path program 673 times [2021-05-22 02:29:27,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:27,755 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1338702040] [2021-05-22 02:29:27,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:27,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:27,833 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:27,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:27,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1338702040] [2021-05-22 02:29:27,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1338702040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:27,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [347556052] [2021-05-22 02:29:27,833 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 674 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 674 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:27,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:27,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:27,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:27,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:27,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,910 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:27,912 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:27,912 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:29:27,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:27,987 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:27,989 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:27,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:27,990 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,004 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:28,005 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:28,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:28,006 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:28,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:28,021 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:13 [2021-05-22 02:29:28,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:28,047 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [347556052] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:28,047 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:28,047 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:28,047 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259435365] [2021-05-22 02:29:28,047 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:28,047 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:28,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:28,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:28,048 INFO L87 Difference]: Start difference. First operand 478 states and 1500 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:28,224 INFO L93 Difference]: Finished difference Result 573 states and 1771 transitions. [2021-05-22 02:29:28,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:28,224 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:28,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:28,225 INFO L225 Difference]: With dead ends: 573 [2021-05-22 02:29:28,225 INFO L226 Difference]: Without dead ends: 546 [2021-05-22 02:29:28,225 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 142.5ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:28,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2021-05-22 02:29:28,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 478. [2021-05-22 02:29:28,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.140461215932914) internal successors, (1498), 477 states have internal predecessors, (1498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1498 transitions. [2021-05-22 02:29:28,230 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1498 transitions. Word has length 21 [2021-05-22 02:29:28,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:28,230 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1498 transitions. [2021-05-22 02:29:28,230 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,230 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1498 transitions. [2021-05-22 02:29:28,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:28,230 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:28,230 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:28,431 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3642,674 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:28,431 INFO L430 AbstractCegarLoop]: === Iteration 686 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:28,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:28,431 INFO L82 PathProgramCache]: Analyzing trace with hash -1288035615, now seen corresponding path program 674 times [2021-05-22 02:29:28,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:28,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826411398] [2021-05-22 02:29:28,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:28,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:28,526 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:28,526 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:28,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826411398] [2021-05-22 02:29:28,526 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826411398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:28,526 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192653214] [2021-05-22 02:29:28,527 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 675 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 675 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:28,551 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:28,551 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:28,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:28,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:28,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:28,603 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:28,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:28,605 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,622 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:28,624 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:28,624 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:28,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:28,707 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,709 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:28,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:28,710 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:28,726 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:28,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:28,727 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:28,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:28,742 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:28,742 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:29:28,792 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:28,792 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192653214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:28,792 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:28,792 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:28,792 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1942305114] [2021-05-22 02:29:28,792 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:28,792 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:28,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:28,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:28,793 INFO L87 Difference]: Start difference. First operand 478 states and 1498 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:28,980 INFO L93 Difference]: Finished difference Result 679 states and 2088 transitions. [2021-05-22 02:29:28,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:28,980 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:28,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:28,981 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:29:28,981 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:29:28,981 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 213.1ms TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:28,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:29:28,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 492. [2021-05-22 02:29:28,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 491 states have (on average 3.1384928716904277) internal successors, (1541), 491 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1541 transitions. [2021-05-22 02:29:28,987 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1541 transitions. Word has length 21 [2021-05-22 02:29:28,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:28,987 INFO L482 AbstractCegarLoop]: Abstraction has 492 states and 1541 transitions. [2021-05-22 02:29:28,987 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:28,987 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1541 transitions. [2021-05-22 02:29:28,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:28,988 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:28,988 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:29,188 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3652,675 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:29,188 INFO L430 AbstractCegarLoop]: === Iteration 687 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:29,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:29,188 INFO L82 PathProgramCache]: Analyzing trace with hash 398356225, now seen corresponding path program 675 times [2021-05-22 02:29:29,188 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:29,188 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456160751] [2021-05-22 02:29:29,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:29,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:29,293 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:29,294 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:29,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456160751] [2021-05-22 02:29:29,294 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456160751] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:29,294 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [419981890] [2021-05-22 02:29:29,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 676 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 676 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:29,325 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:29,325 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:29,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:29,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:29,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:29,394 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:29,396 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:29,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:29,398 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:29,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:29,422 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:29,422 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:29,551 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:29,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:29,552 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:29,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:29,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:29,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:29,564 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:29,573 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:29,574 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:29,574 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:29:29,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:29,586 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [419981890] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:29,586 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:29,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:29,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1270585929] [2021-05-22 02:29:29,587 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:29,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:29,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:29,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:29,587 INFO L87 Difference]: Start difference. First operand 492 states and 1541 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:29,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:29,728 INFO L93 Difference]: Finished difference Result 579 states and 1779 transitions. [2021-05-22 02:29:29,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:29,728 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:29,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:29,729 INFO L225 Difference]: With dead ends: 579 [2021-05-22 02:29:29,729 INFO L226 Difference]: Without dead ends: 558 [2021-05-22 02:29:29,729 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 235.3ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:29,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2021-05-22 02:29:29,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 493. [2021-05-22 02:29:29,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1463414634146343) internal successors, (1548), 492 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:29,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1548 transitions. [2021-05-22 02:29:29,734 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1548 transitions. Word has length 21 [2021-05-22 02:29:29,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:29,734 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1548 transitions. [2021-05-22 02:29:29,735 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:29,735 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1548 transitions. [2021-05-22 02:29:29,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:29,735 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:29,735 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:29,935 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3664,676 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:29,936 INFO L430 AbstractCegarLoop]: === Iteration 688 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:29,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:29,936 INFO L82 PathProgramCache]: Analyzing trace with hash 420860597, now seen corresponding path program 676 times [2021-05-22 02:29:29,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:29,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426754646] [2021-05-22 02:29:29,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:29,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:30,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:30,019 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:30,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426754646] [2021-05-22 02:29:30,019 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426754646] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:30,019 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2074993167] [2021-05-22 02:29:30,019 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 677 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 677 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:30,043 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:30,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:30,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:30,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:30,105 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,105 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:30,106 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:30,109 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,122 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:30,124 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:29:30,165 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:30,167 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:30,170 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,187 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,189 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:30,190 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,208 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:30,208 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:29:30,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:30,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2074993167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:30,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:30,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:30,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080303822] [2021-05-22 02:29:30,242 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:30,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:30,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:30,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:30,242 INFO L87 Difference]: Start difference. First operand 493 states and 1548 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:30,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:30,382 INFO L93 Difference]: Finished difference Result 619 states and 1919 transitions. [2021-05-22 02:29:30,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:30,382 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:30,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:30,383 INFO L225 Difference]: With dead ends: 619 [2021-05-22 02:29:30,383 INFO L226 Difference]: Without dead ends: 590 [2021-05-22 02:29:30,383 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 141.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:30,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-22 02:29:30,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 493. [2021-05-22 02:29:30,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1463414634146343) internal successors, (1548), 492 states have internal predecessors, (1548), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:30,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1548 transitions. [2021-05-22 02:29:30,388 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1548 transitions. Word has length 21 [2021-05-22 02:29:30,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:30,388 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1548 transitions. [2021-05-22 02:29:30,388 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:30,388 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1548 transitions. [2021-05-22 02:29:30,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:30,388 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:30,388 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:30,589 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3674,677 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:30,589 INFO L430 AbstractCegarLoop]: === Iteration 689 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:30,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:30,589 INFO L82 PathProgramCache]: Analyzing trace with hash 718127007, now seen corresponding path program 677 times [2021-05-22 02:29:30,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:30,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869476360] [2021-05-22 02:29:30,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:30,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:30,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:30,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:30,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869476360] [2021-05-22 02:29:30,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869476360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:30,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168247682] [2021-05-22 02:29:30,682 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 678 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 678 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:30,706 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:30,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:30,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:29:30,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:30,752 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:30,753 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:30,757 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,787 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:30,787 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:75 [2021-05-22 02:29:30,877 INFO L446 ElimStorePlain]: Different costs {1=[o_2], 3=[o_0]} [2021-05-22 02:29:30,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:30,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:30,885 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:30,889 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,891 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:30,892 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,939 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,942 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:30,944 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:30,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:30,947 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:30,993 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:30,994 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:29:30,995 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:153, output treesize:57 [2021-05-22 02:29:31,113 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:31,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168247682] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:31,114 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:31,114 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:31,114 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [272436964] [2021-05-22 02:29:31,114 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:31,114 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:31,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:31,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:31,114 INFO L87 Difference]: Start difference. First operand 493 states and 1548 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:31,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:31,559 INFO L93 Difference]: Finished difference Result 703 states and 2169 transitions. [2021-05-22 02:29:31,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:29:31,559 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:31,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:31,560 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:29:31,560 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:29:31,560 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 470.9ms TimeCoverageRelationStatistics Valid=99, Invalid=453, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:29:31,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:29:31,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 492. [2021-05-22 02:29:31,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 491 states have (on average 3.1547861507128308) internal successors, (1549), 491 states have internal predecessors, (1549), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:31,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1549 transitions. [2021-05-22 02:29:31,565 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1549 transitions. Word has length 21 [2021-05-22 02:29:31,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:31,565 INFO L482 AbstractCegarLoop]: Abstraction has 492 states and 1549 transitions. [2021-05-22 02:29:31,565 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:31,565 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1549 transitions. [2021-05-22 02:29:31,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:31,566 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:31,566 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:31,766 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 678 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3683 [2021-05-22 02:29:31,766 INFO L430 AbstractCegarLoop]: === Iteration 690 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:31,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:31,767 INFO L82 PathProgramCache]: Analyzing trace with hash 433864323, now seen corresponding path program 678 times [2021-05-22 02:29:31,767 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:31,767 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105321486] [2021-05-22 02:29:31,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:31,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:31,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:31,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:31,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105321486] [2021-05-22 02:29:31,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105321486] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:31,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888867835] [2021-05-22 02:29:31,866 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 679 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 679 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:31,891 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:31,891 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:31,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:31,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:31,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:31,943 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:31,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:31,944 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:31,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:31,947 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:31,964 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:31,966 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:31,966 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:32,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:32,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,013 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:32,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:32,014 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,031 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:32,034 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:32,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:32,034 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:32,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:32,051 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:29:32,126 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:32,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888867835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:32,126 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:32,126 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:32,126 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [45315750] [2021-05-22 02:29:32,126 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:32,126 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:32,127 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:32,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:32,127 INFO L87 Difference]: Start difference. First operand 492 states and 1549 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:32,294 INFO L93 Difference]: Finished difference Result 703 states and 2150 transitions. [2021-05-22 02:29:32,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:32,294 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:32,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:32,295 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:29:32,295 INFO L226 Difference]: Without dead ends: 676 [2021-05-22 02:29:32,295 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 218.9ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:32,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 676 states. [2021-05-22 02:29:32,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 676 to 495. [2021-05-22 02:29:32,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 495 states, 494 states have (on average 3.1639676113360324) internal successors, (1563), 494 states have internal predecessors, (1563), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 1563 transitions. [2021-05-22 02:29:32,300 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 1563 transitions. Word has length 21 [2021-05-22 02:29:32,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:32,300 INFO L482 AbstractCegarLoop]: Abstraction has 495 states and 1563 transitions. [2021-05-22 02:29:32,301 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,301 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 1563 transitions. [2021-05-22 02:29:32,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:32,301 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:32,301 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:32,501 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3695,679 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:32,502 INFO L430 AbstractCegarLoop]: === Iteration 691 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:32,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:32,502 INFO L82 PathProgramCache]: Analyzing trace with hash -1785413183, now seen corresponding path program 679 times [2021-05-22 02:29:32,502 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:32,502 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656390191] [2021-05-22 02:29:32,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:32,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:32,584 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:32,584 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:32,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656390191] [2021-05-22 02:29:32,584 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656390191] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:32,584 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661008251] [2021-05-22 02:29:32,584 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 680 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 680 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:32,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:32,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:32,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:32,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:32,662 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,664 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:32,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:32,669 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,686 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:32,688 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:32,688 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:32,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:32,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:32,748 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,756 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:32,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:32,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:32,759 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,767 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:32,767 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:32,767 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:29:32,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:32,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661008251] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:32,782 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:32,782 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:32,782 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436806892] [2021-05-22 02:29:32,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:32,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:32,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:32,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:32,783 INFO L87 Difference]: Start difference. First operand 495 states and 1563 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:32,924 INFO L93 Difference]: Finished difference Result 596 states and 1840 transitions. [2021-05-22 02:29:32,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:32,925 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:32,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:32,925 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:29:32,925 INFO L226 Difference]: Without dead ends: 575 [2021-05-22 02:29:32,925 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 144.7ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:32,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-05-22 02:29:32,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 491. [2021-05-22 02:29:32,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.1551020408163266) internal successors, (1546), 490 states have internal predecessors, (1546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1546 transitions. [2021-05-22 02:29:32,930 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1546 transitions. Word has length 21 [2021-05-22 02:29:32,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:32,930 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1546 transitions. [2021-05-22 02:29:32,930 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:32,931 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1546 transitions. [2021-05-22 02:29:32,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:32,931 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:32,931 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:33,131 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 680 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3707 [2021-05-22 02:29:33,132 INFO L430 AbstractCegarLoop]: === Iteration 692 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:33,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:33,132 INFO L82 PathProgramCache]: Analyzing trace with hash 2118105541, now seen corresponding path program 680 times [2021-05-22 02:29:33,132 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:33,132 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151366757] [2021-05-22 02:29:33,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:33,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:33,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:33,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:33,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151366757] [2021-05-22 02:29:33,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151366757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:33,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1037629667] [2021-05-22 02:29:33,215 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 681 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 681 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:33,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:33,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:33,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:33,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:33,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:33,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:33,287 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:33,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:33,296 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:33,296 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:29:33,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:29:33,345 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:33,346 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:33,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:29:33,347 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:33,365 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:33,367 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:33,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:33,368 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:33,385 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:33,386 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:33,386 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:29:33,434 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:33,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1037629667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:33,435 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:33,435 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:33,435 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111994260] [2021-05-22 02:29:33,435 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:33,435 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:33,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:33,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:33,435 INFO L87 Difference]: Start difference. First operand 491 states and 1546 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:33,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:33,597 INFO L93 Difference]: Finished difference Result 593 states and 1840 transitions. [2021-05-22 02:29:33,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:33,598 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:33,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:33,598 INFO L225 Difference]: With dead ends: 593 [2021-05-22 02:29:33,598 INFO L226 Difference]: Without dead ends: 557 [2021-05-22 02:29:33,599 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 141.9ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:33,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2021-05-22 02:29:33,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 492. [2021-05-22 02:29:33,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 491 states have (on average 3.158859470468432) internal successors, (1551), 491 states have internal predecessors, (1551), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:33,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1551 transitions. [2021-05-22 02:29:33,604 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1551 transitions. Word has length 21 [2021-05-22 02:29:33,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:33,604 INFO L482 AbstractCegarLoop]: Abstraction has 492 states and 1551 transitions. [2021-05-22 02:29:33,604 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:33,604 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1551 transitions. [2021-05-22 02:29:33,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:33,604 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:33,604 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:33,805 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3711,681 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:33,805 INFO L430 AbstractCegarLoop]: === Iteration 693 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:33,805 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:33,805 INFO L82 PathProgramCache]: Analyzing trace with hash -1879595345, now seen corresponding path program 681 times [2021-05-22 02:29:33,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:33,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336158443] [2021-05-22 02:29:33,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:33,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:33,895 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:33,896 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:33,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336158443] [2021-05-22 02:29:33,896 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336158443] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:33,896 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715963174] [2021-05-22 02:29:33,896 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 682 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 682 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:33,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:29:33,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:33,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:33,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:33,986 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:33,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:33,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:33,988 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:33,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:33,991 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,004 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,005 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:34,005 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:29:34,048 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:34,049 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:34,052 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,069 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,071 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:34,072 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,089 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,090 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:34,090 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:29:34,161 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:34,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715963174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:34,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:34,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:34,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1734342065] [2021-05-22 02:29:34,162 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:34,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:34,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:34,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:34,162 INFO L87 Difference]: Start difference. First operand 492 states and 1551 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:34,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:34,398 INFO L93 Difference]: Finished difference Result 704 states and 2171 transitions. [2021-05-22 02:29:34,398 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:29:34,398 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:34,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:34,399 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:29:34,399 INFO L226 Difference]: Without dead ends: 681 [2021-05-22 02:29:34,399 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 247.3ms TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:29:34,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-05-22 02:29:34,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 507. [2021-05-22 02:29:34,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 3.1739130434782608) internal successors, (1606), 506 states have internal predecessors, (1606), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:34,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 1606 transitions. [2021-05-22 02:29:34,404 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 1606 transitions. Word has length 21 [2021-05-22 02:29:34,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:34,404 INFO L482 AbstractCegarLoop]: Abstraction has 507 states and 1606 transitions. [2021-05-22 02:29:34,405 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:34,405 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 1606 transitions. [2021-05-22 02:29:34,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:34,405 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:34,405 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:34,605 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 682 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3717 [2021-05-22 02:29:34,606 INFO L430 AbstractCegarLoop]: === Iteration 694 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:34,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:34,606 INFO L82 PathProgramCache]: Analyzing trace with hash 2131109267, now seen corresponding path program 682 times [2021-05-22 02:29:34,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:34,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1232960596] [2021-05-22 02:29:34,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:34,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:34,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:34,702 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:34,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1232960596] [2021-05-22 02:29:34,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1232960596] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:34,702 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109267931] [2021-05-22 02:29:34,702 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 683 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 683 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:34,726 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:34,727 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:34,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:34,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:34,778 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,779 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:34,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:34,782 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,801 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:34,801 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:34,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:34,845 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,847 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:34,848 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,865 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,867 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:34,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:34,868 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:34,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:34,885 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:34,885 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:29:34,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:34,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109267931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:34,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:34,960 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:34,960 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116612716] [2021-05-22 02:29:34,960 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:34,960 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:34,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:34,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:34,960 INFO L87 Difference]: Start difference. First operand 507 states and 1606 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:35,176 INFO L93 Difference]: Finished difference Result 704 states and 2178 transitions. [2021-05-22 02:29:35,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:35,176 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:35,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:35,177 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:29:35,177 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:29:35,177 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 208.8ms TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:29:35,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:29:35,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 513. [2021-05-22 02:29:35,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 3.171875) internal successors, (1624), 512 states have internal predecessors, (1624), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 1624 transitions. [2021-05-22 02:29:35,183 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 1624 transitions. Word has length 21 [2021-05-22 02:29:35,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:35,183 INFO L482 AbstractCegarLoop]: Abstraction has 513 states and 1624 transitions. [2021-05-22 02:29:35,183 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,183 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 1624 transitions. [2021-05-22 02:29:35,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:35,183 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:35,183 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:35,384 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 683 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3728 [2021-05-22 02:29:35,384 INFO L430 AbstractCegarLoop]: === Iteration 695 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:35,384 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:35,384 INFO L82 PathProgramCache]: Analyzing trace with hash 170362301, now seen corresponding path program 683 times [2021-05-22 02:29:35,384 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:35,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834074342] [2021-05-22 02:29:35,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:35,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:35,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:35,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:35,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834074342] [2021-05-22 02:29:35,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834074342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:35,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104782826] [2021-05-22 02:29:35,465 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 684 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 684 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:35,491 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:29:35,491 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:35,491 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:29:35,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:35,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:35,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,554 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:35,555 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:35,570 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:35,570 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:29:35,626 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:35,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:35,631 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:35,663 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,663 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:35,664 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:35,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:35,667 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:35,694 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:35,696 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:35,696 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:89, output treesize:31 [2021-05-22 02:29:35,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:35,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [104782826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:35,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:35,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:35,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [104325514] [2021-05-22 02:29:35,773 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:35,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:35,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:35,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:35,774 INFO L87 Difference]: Start difference. First operand 513 states and 1624 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:35,970 INFO L93 Difference]: Finished difference Result 599 states and 1858 transitions. [2021-05-22 02:29:35,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:35,970 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:35,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:35,971 INFO L225 Difference]: With dead ends: 599 [2021-05-22 02:29:35,971 INFO L226 Difference]: Without dead ends: 580 [2021-05-22 02:29:35,971 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 232.3ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:35,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-22 02:29:35,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 497. [2021-05-22 02:29:35,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1653225806451615) internal successors, (1570), 496 states have internal predecessors, (1570), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1570 transitions. [2021-05-22 02:29:35,976 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1570 transitions. Word has length 21 [2021-05-22 02:29:35,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:35,976 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1570 transitions. [2021-05-22 02:29:35,976 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:35,976 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1570 transitions. [2021-05-22 02:29:35,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:35,977 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:35,977 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:36,177 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3740,684 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:36,177 INFO L430 AbstractCegarLoop]: === Iteration 696 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:36,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:36,178 INFO L82 PathProgramCache]: Analyzing trace with hash 715734955, now seen corresponding path program 684 times [2021-05-22 02:29:36,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:36,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521335909] [2021-05-22 02:29:36,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:36,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:36,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:36,265 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:36,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521335909] [2021-05-22 02:29:36,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521335909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:36,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1097290164] [2021-05-22 02:29:36,265 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 685 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 685 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:36,290 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:36,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:36,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:36,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:36,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:36,343 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:36,345 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:36,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:36,346 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:36,363 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:36,364 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:36,364 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:36,460 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:36,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:36,461 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:36,468 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:36,470 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:36,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:36,471 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:36,477 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:36,478 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:36,478 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:29:36,494 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:36,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1097290164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:36,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:36,495 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:36,495 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029975088] [2021-05-22 02:29:36,495 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:36,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:36,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:36,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:36,495 INFO L87 Difference]: Start difference. First operand 497 states and 1570 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:36,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:36,683 INFO L93 Difference]: Finished difference Result 608 states and 1877 transitions. [2021-05-22 02:29:36,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:36,684 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:36,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:36,685 INFO L225 Difference]: With dead ends: 608 [2021-05-22 02:29:36,685 INFO L226 Difference]: Without dead ends: 587 [2021-05-22 02:29:36,685 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 192.4ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:36,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-05-22 02:29:36,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 497. [2021-05-22 02:29:36,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1733870967741935) internal successors, (1574), 496 states have internal predecessors, (1574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:36,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1574 transitions. [2021-05-22 02:29:36,690 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1574 transitions. Word has length 21 [2021-05-22 02:29:36,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:36,690 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1574 transitions. [2021-05-22 02:29:36,690 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:36,690 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1574 transitions. [2021-05-22 02:29:36,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:36,690 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:36,690 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:36,891 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 685 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3749 [2021-05-22 02:29:36,891 INFO L430 AbstractCegarLoop]: === Iteration 697 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:36,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:36,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1003249727, now seen corresponding path program 685 times [2021-05-22 02:29:36,891 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:36,891 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110890788] [2021-05-22 02:29:36,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:36,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:36,974 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:36,974 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:36,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110890788] [2021-05-22 02:29:36,974 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110890788] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:36,974 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [202134910] [2021-05-22 02:29:36,974 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 686 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 686 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:36,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:36,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:37,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:37,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,051 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,051 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:37,052 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:37,055 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,072 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,073 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:37,073 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:29:37,129 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:37,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:37,142 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,151 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,151 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:29:37,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:37,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [202134910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:37,166 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:37,166 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:37,166 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909332238] [2021-05-22 02:29:37,166 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:37,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:37,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:37,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:37,166 INFO L87 Difference]: Start difference. First operand 497 states and 1574 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:37,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:37,331 INFO L93 Difference]: Finished difference Result 608 states and 1877 transitions. [2021-05-22 02:29:37,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:37,332 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:37,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:37,333 INFO L225 Difference]: With dead ends: 608 [2021-05-22 02:29:37,333 INFO L226 Difference]: Without dead ends: 587 [2021-05-22 02:29:37,333 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 141.0ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:37,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-05-22 02:29:37,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 493. [2021-05-22 02:29:37,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1646341463414633) internal successors, (1557), 492 states have internal predecessors, (1557), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:37,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1557 transitions. [2021-05-22 02:29:37,338 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1557 transitions. Word has length 21 [2021-05-22 02:29:37,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:37,338 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1557 transitions. [2021-05-22 02:29:37,338 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:37,338 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1557 transitions. [2021-05-22 02:29:37,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:37,339 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:37,339 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:37,540 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3756,686 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:37,541 INFO L430 AbstractCegarLoop]: === Iteration 698 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:37,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:37,541 INFO L82 PathProgramCache]: Analyzing trace with hash 393137451, now seen corresponding path program 686 times [2021-05-22 02:29:37,541 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:37,541 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [770646848] [2021-05-22 02:29:37,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:37,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:37,637 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:37,637 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:37,637 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [770646848] [2021-05-22 02:29:37,638 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [770646848] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:37,638 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [526730883] [2021-05-22 02:29:37,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 687 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 687 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:37,662 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:37,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:37,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:37,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:37,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:37,725 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,731 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,733 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:37,733 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:29:37,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:37,789 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,796 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,798 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:37,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:37,799 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,805 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:37,806 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:37,806 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:29:37,835 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:37,835 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [526730883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:37,835 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:37,835 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:37,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762378211] [2021-05-22 02:29:37,835 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:37,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:37,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:37,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:37,836 INFO L87 Difference]: Start difference. First operand 493 states and 1557 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:38,001 INFO L93 Difference]: Finished difference Result 655 states and 2027 transitions. [2021-05-22 02:29:38,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:38,002 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:38,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:38,003 INFO L225 Difference]: With dead ends: 655 [2021-05-22 02:29:38,003 INFO L226 Difference]: Without dead ends: 634 [2021-05-22 02:29:38,003 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 186.2ms TimeCoverageRelationStatistics Valid=60, Invalid=282, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:38,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2021-05-22 02:29:38,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 495. [2021-05-22 02:29:38,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 495 states, 494 states have (on average 3.161943319838057) internal successors, (1562), 494 states have internal predecessors, (1562), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 495 states to 495 states and 1562 transitions. [2021-05-22 02:29:38,008 INFO L78 Accepts]: Start accepts. Automaton has 495 states and 1562 transitions. Word has length 21 [2021-05-22 02:29:38,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:38,008 INFO L482 AbstractCegarLoop]: Abstraction has 495 states and 1562 transitions. [2021-05-22 02:29:38,008 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,008 INFO L276 IsEmpty]: Start isEmpty. Operand 495 states and 1562 transitions. [2021-05-22 02:29:38,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:38,009 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:38,009 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:38,209 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 687 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3760 [2021-05-22 02:29:38,209 INFO L430 AbstractCegarLoop]: === Iteration 699 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:38,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:38,209 INFO L82 PathProgramCache]: Analyzing trace with hash -936790711, now seen corresponding path program 687 times [2021-05-22 02:29:38,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:38,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863501832] [2021-05-22 02:29:38,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:38,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:38,304 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:38,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:38,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863501832] [2021-05-22 02:29:38,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [863501832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:38,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674845988] [2021-05-22 02:29:38,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 688 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 688 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:38,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:38,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:38,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:38,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:38,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:38,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:38,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:38,398 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:38,399 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:38,399 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:29:38,427 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:38,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:38,428 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:38,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:38,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:38,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:38,439 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:38,447 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:38,447 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:38,448 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:29:38,492 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:38,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674845988] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:38,492 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:38,492 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:38,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293744156] [2021-05-22 02:29:38,493 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:38,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:38,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:38,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:38,493 INFO L87 Difference]: Start difference. First operand 495 states and 1562 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:38,661 INFO L93 Difference]: Finished difference Result 649 states and 2012 transitions. [2021-05-22 02:29:38,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:38,662 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:38,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:38,663 INFO L225 Difference]: With dead ends: 649 [2021-05-22 02:29:38,663 INFO L226 Difference]: Without dead ends: 628 [2021-05-22 02:29:38,663 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 181.4ms TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:38,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-22 02:29:38,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 492. [2021-05-22 02:29:38,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 491 states have (on average 3.1568228105906315) internal successors, (1550), 491 states have internal predecessors, (1550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1550 transitions. [2021-05-22 02:29:38,668 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1550 transitions. Word has length 21 [2021-05-22 02:29:38,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:38,668 INFO L482 AbstractCegarLoop]: Abstraction has 492 states and 1550 transitions. [2021-05-22 02:29:38,668 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:38,668 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1550 transitions. [2021-05-22 02:29:38,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:38,669 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:38,669 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:38,869 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3766,688 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:38,869 INFO L430 AbstractCegarLoop]: === Iteration 700 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:38,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:38,870 INFO L82 PathProgramCache]: Analyzing trace with hash -1851872199, now seen corresponding path program 688 times [2021-05-22 02:29:38,870 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:38,870 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616343023] [2021-05-22 02:29:38,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:38,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:38,968 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:38,969 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:38,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616343023] [2021-05-22 02:29:38,969 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1616343023] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:38,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784868843] [2021-05-22 02:29:38,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 689 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 689 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:38,997 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:38,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:38,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:38,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:39,060 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:39,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:39,062 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,068 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:39,070 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:39,070 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:29:39,097 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:39,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:39,098 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,107 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:39,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:39,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:39,110 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:39,118 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,118 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:29:39,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:39,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784868843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:39,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:39,163 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:39,163 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736234855] [2021-05-22 02:29:39,163 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:39,163 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:39,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:39,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:39,163 INFO L87 Difference]: Start difference. First operand 492 states and 1550 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:39,324 INFO L93 Difference]: Finished difference Result 647 states and 1991 transitions. [2021-05-22 02:29:39,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:39,325 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:39,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:39,325 INFO L225 Difference]: With dead ends: 647 [2021-05-22 02:29:39,326 INFO L226 Difference]: Without dead ends: 626 [2021-05-22 02:29:39,326 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 179.5ms TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:39,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2021-05-22 02:29:39,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 470. [2021-05-22 02:29:39,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.140724946695096) internal successors, (1473), 469 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1473 transitions. [2021-05-22 02:29:39,331 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1473 transitions. Word has length 21 [2021-05-22 02:29:39,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:39,331 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1473 transitions. [2021-05-22 02:29:39,331 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,331 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1473 transitions. [2021-05-22 02:29:39,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:39,331 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:39,331 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:39,532 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3768,689 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:39,532 INFO L430 AbstractCegarLoop]: === Iteration 701 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:39,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:39,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1088900687, now seen corresponding path program 689 times [2021-05-22 02:29:39,532 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:39,532 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [408693594] [2021-05-22 02:29:39,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:39,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:39,607 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:39,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:39,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [408693594] [2021-05-22 02:29:39,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [408693594] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:39,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279365024] [2021-05-22 02:29:39,608 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 690 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 690 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:39,632 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:39,632 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:39,633 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:39,633 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:39,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:39,670 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:39,674 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,674 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:29:39,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:39,702 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:39,704 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:39,704 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:39,705 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:29:39,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:39,712 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279365024] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:39,712 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:39,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:29:39,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838109224] [2021-05-22 02:29:39,713 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:29:39,713 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:39,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:29:39,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:39,713 INFO L87 Difference]: Start difference. First operand 470 states and 1473 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:39,844 INFO L93 Difference]: Finished difference Result 629 states and 1939 transitions. [2021-05-22 02:29:39,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:39,844 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:39,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:39,845 INFO L225 Difference]: With dead ends: 629 [2021-05-22 02:29:39,845 INFO L226 Difference]: Without dead ends: 607 [2021-05-22 02:29:39,845 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 110.8ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:39,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-22 02:29:39,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 479. [2021-05-22 02:29:39,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1443514644351462) internal successors, (1503), 478 states have internal predecessors, (1503), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1503 transitions. [2021-05-22 02:29:39,850 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1503 transitions. Word has length 21 [2021-05-22 02:29:39,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:39,850 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1503 transitions. [2021-05-22 02:29:39,850 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:39,850 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1503 transitions. [2021-05-22 02:29:39,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:39,850 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:39,850 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:40,051 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 690 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3770 [2021-05-22 02:29:40,051 INFO L430 AbstractCegarLoop]: === Iteration 702 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:40,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:40,051 INFO L82 PathProgramCache]: Analyzing trace with hash 587109351, now seen corresponding path program 690 times [2021-05-22 02:29:40,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:40,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886101791] [2021-05-22 02:29:40,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:40,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:40,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:40,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:40,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886101791] [2021-05-22 02:29:40,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886101791] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:40,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [533959497] [2021-05-22 02:29:40,121 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 691 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 691 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:40,146 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:29:40,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:40,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:40,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:40,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:40,185 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,188 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:40,189 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,189 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:29:40,203 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:40,204 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,207 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:40,207 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:40,208 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,208 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:29:40,220 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:40,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [533959497] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:40,221 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:40,221 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:29:40,221 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344129337] [2021-05-22 02:29:40,221 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:29:40,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:40,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:29:40,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:40,221 INFO L87 Difference]: Start difference. First operand 479 states and 1503 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:40,357 INFO L93 Difference]: Finished difference Result 638 states and 1963 transitions. [2021-05-22 02:29:40,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:40,357 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:40,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:40,358 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:29:40,358 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:29:40,358 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 98.6ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:40,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:29:40,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 476. [2021-05-22 02:29:40,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1389473684210527) internal successors, (1491), 475 states have internal predecessors, (1491), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1491 transitions. [2021-05-22 02:29:40,364 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1491 transitions. Word has length 21 [2021-05-22 02:29:40,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:40,364 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1491 transitions. [2021-05-22 02:29:40,364 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,364 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1491 transitions. [2021-05-22 02:29:40,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:40,364 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:40,364 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:40,564 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3772,691 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:40,565 INFO L430 AbstractCegarLoop]: === Iteration 703 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:40,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:40,565 INFO L82 PathProgramCache]: Analyzing trace with hash -1519674769, now seen corresponding path program 691 times [2021-05-22 02:29:40,565 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:40,565 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364995482] [2021-05-22 02:29:40,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:40,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:40,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:40,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:40,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364995482] [2021-05-22 02:29:40,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364995482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:40,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718198915] [2021-05-22 02:29:40,635 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 692 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 692 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:40,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:40,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:40,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:40,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:40,699 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,703 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:40,704 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,704 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:29:40,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:40,713 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,717 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:40,717 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:40,717 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:40,717 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:29:40,730 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:40,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718198915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:40,731 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:40,731 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:29:40,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830421571] [2021-05-22 02:29:40,731 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:29:40,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:40,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:29:40,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:29:40,731 INFO L87 Difference]: Start difference. First operand 476 states and 1491 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:40,858 INFO L93 Difference]: Finished difference Result 626 states and 1930 transitions. [2021-05-22 02:29:40,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:40,858 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:40,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:40,859 INFO L225 Difference]: With dead ends: 626 [2021-05-22 02:29:40,859 INFO L226 Difference]: Without dead ends: 604 [2021-05-22 02:29:40,859 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 85.3ms TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:29:40,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2021-05-22 02:29:40,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 473. [2021-05-22 02:29:40,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.139830508474576) internal successors, (1482), 472 states have internal predecessors, (1482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1482 transitions. [2021-05-22 02:29:40,864 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1482 transitions. Word has length 21 [2021-05-22 02:29:40,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:40,864 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1482 transitions. [2021-05-22 02:29:40,864 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:40,864 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1482 transitions. [2021-05-22 02:29:40,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:40,865 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:40,865 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:41,065 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3774,692 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:41,065 INFO L430 AbstractCegarLoop]: === Iteration 704 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:41,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:41,065 INFO L82 PathProgramCache]: Analyzing trace with hash -479438971, now seen corresponding path program 692 times [2021-05-22 02:29:41,065 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:41,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306182507] [2021-05-22 02:29:41,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:41,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:41,130 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:41,131 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:41,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306182507] [2021-05-22 02:29:41,131 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306182507] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:41,131 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1342741754] [2021-05-22 02:29:41,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 693 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 693 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:41,155 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:41,155 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:41,156 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:41,156 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:41,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:41,195 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,197 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:41,198 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,198 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:29:41,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:41,209 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,212 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:41,212 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:41,212 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,213 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:29:41,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:41,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1342741754] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:41,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:41,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:29:41,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507548285] [2021-05-22 02:29:41,226 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:29:41,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:41,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:29:41,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:29:41,226 INFO L87 Difference]: Start difference. First operand 473 states and 1482 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:41,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:41,343 INFO L93 Difference]: Finished difference Result 704 states and 2158 transitions. [2021-05-22 02:29:41,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:41,343 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:41,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:41,344 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:29:41,344 INFO L226 Difference]: Without dead ends: 682 [2021-05-22 02:29:41,344 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 84.5ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:41,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-05-22 02:29:41,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 470. [2021-05-22 02:29:41,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.140724946695096) internal successors, (1473), 469 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:41,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1473 transitions. [2021-05-22 02:29:41,350 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1473 transitions. Word has length 21 [2021-05-22 02:29:41,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:41,350 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1473 transitions. [2021-05-22 02:29:41,350 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:41,350 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1473 transitions. [2021-05-22 02:29:41,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:41,350 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:41,350 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:41,550 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3776,693 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:41,551 INFO L430 AbstractCegarLoop]: === Iteration 705 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:41,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:41,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1152442371, now seen corresponding path program 693 times [2021-05-22 02:29:41,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:41,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799752196] [2021-05-22 02:29:41,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:41,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:41,629 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:41,629 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:41,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799752196] [2021-05-22 02:29:41,629 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799752196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:41,629 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [393417436] [2021-05-22 02:29:41,629 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 694 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 694 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:41,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:29:41,654 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:41,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:41,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:41,710 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:41,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:41,711 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:41,713 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,719 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:41,720 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:41,720 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:29:41,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:41,755 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,758 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:41,758 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:41,758 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:41,758 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:29:41,785 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:41,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [393417436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:41,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:41,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:41,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800505219] [2021-05-22 02:29:41,785 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:41,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:41,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:41,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:41,785 INFO L87 Difference]: Start difference. First operand 470 states and 1473 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:41,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:41,995 INFO L93 Difference]: Finished difference Result 648 states and 2002 transitions. [2021-05-22 02:29:41,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:41,996 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:41,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:41,997 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:29:41,997 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:29:41,997 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 184.9ms TimeCoverageRelationStatistics Valid=83, Invalid=379, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:29:41,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:29:42,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 480. [2021-05-22 02:29:42,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.139874739039666) internal successors, (1504), 479 states have internal predecessors, (1504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:42,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1504 transitions. [2021-05-22 02:29:42,002 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1504 transitions. Word has length 21 [2021-05-22 02:29:42,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:42,002 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1504 transitions. [2021-05-22 02:29:42,002 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:42,002 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1504 transitions. [2021-05-22 02:29:42,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:42,002 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:42,003 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:42,203 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3778,694 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:42,203 INFO L430 AbstractCegarLoop]: === Iteration 706 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:42,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:42,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1456133085, now seen corresponding path program 694 times [2021-05-22 02:29:42,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:42,203 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139194231] [2021-05-22 02:29:42,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:42,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:42,284 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:42,284 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:42,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139194231] [2021-05-22 02:29:42,284 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139194231] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:42,284 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149985768] [2021-05-22 02:29:42,284 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 695 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 695 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:42,308 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:42,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:42,309 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:42,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:42,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:42,361 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:42,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:42,363 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:42,369 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:42,370 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:42,370 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:29:42,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:42,393 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:42,401 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:42,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:42,403 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:42,409 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:42,409 INFO L518 ElimStorePlain]: Eliminatee v_prenex_194 vanished before elimination [2021-05-22 02:29:42,409 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:42,410 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:42,410 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:29:42,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:42,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1149985768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:42,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:42,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:42,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087174503] [2021-05-22 02:29:42,455 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:42,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:42,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:42,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:42,456 INFO L87 Difference]: Start difference. First operand 480 states and 1504 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:42,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:42,670 INFO L93 Difference]: Finished difference Result 696 states and 2149 transitions. [2021-05-22 02:29:42,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:42,670 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:42,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:42,671 INFO L225 Difference]: With dead ends: 696 [2021-05-22 02:29:42,671 INFO L226 Difference]: Without dead ends: 673 [2021-05-22 02:29:42,671 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 183.1ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:42,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 673 states. [2021-05-22 02:29:42,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 673 to 478. [2021-05-22 02:29:42,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.142557651991614) internal successors, (1499), 477 states have internal predecessors, (1499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:42,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1499 transitions. [2021-05-22 02:29:42,677 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1499 transitions. Word has length 21 [2021-05-22 02:29:42,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:42,677 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1499 transitions. [2021-05-22 02:29:42,677 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:42,677 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1499 transitions. [2021-05-22 02:29:42,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:42,677 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:42,678 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:42,878 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3784,695 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:42,878 INFO L430 AbstractCegarLoop]: === Iteration 707 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:42,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:42,878 INFO L82 PathProgramCache]: Analyzing trace with hash 1953035931, now seen corresponding path program 695 times [2021-05-22 02:29:42,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:42,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467788093] [2021-05-22 02:29:42,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:42,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:42,955 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:42,956 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:42,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467788093] [2021-05-22 02:29:42,956 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467788093] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:42,956 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540624626] [2021-05-22 02:29:42,956 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 696 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 696 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:42,981 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:29:42,981 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:42,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:42,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:43,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:43,013 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,016 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:43,017 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,017 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:29:43,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:43,039 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:43,040 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,046 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:43,047 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:43,047 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:43,047 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:29:43,092 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:43,092 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540624626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:43,092 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:43,092 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:43,092 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214791149] [2021-05-22 02:29:43,092 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:43,093 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:43,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:43,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:43,093 INFO L87 Difference]: Start difference. First operand 478 states and 1499 transitions. Second operand has 16 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:43,276 INFO L93 Difference]: Finished difference Result 666 states and 2060 transitions. [2021-05-22 02:29:43,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:43,276 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:43,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:43,277 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:29:43,277 INFO L226 Difference]: Without dead ends: 639 [2021-05-22 02:29:43,277 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 139.7ms TimeCoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:43,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-22 02:29:43,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 476. [2021-05-22 02:29:43,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1452631578947368) internal successors, (1494), 475 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1494 transitions. [2021-05-22 02:29:43,282 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1494 transitions. Word has length 21 [2021-05-22 02:29:43,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:43,283 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1494 transitions. [2021-05-22 02:29:43,283 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0625) internal successors, (33), 16 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,283 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1494 transitions. [2021-05-22 02:29:43,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:43,283 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:43,283 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:43,483 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3789,696 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:43,484 INFO L430 AbstractCegarLoop]: === Iteration 708 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:43,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:43,484 INFO L82 PathProgramCache]: Analyzing trace with hash -159392699, now seen corresponding path program 696 times [2021-05-22 02:29:43,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:43,484 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464552722] [2021-05-22 02:29:43,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:43,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:43,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:43,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:43,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464552722] [2021-05-22 02:29:43,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464552722] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:43,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163009949] [2021-05-22 02:29:43,564 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 697 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 697 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:43,589 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:43,589 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:43,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:43,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:43,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:43,630 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,632 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:43,633 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,633 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:15 [2021-05-22 02:29:43,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:43,665 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:43,667 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:43,673 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:43,673 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:43,673 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:43,673 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:29:43,719 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:43,719 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163009949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:43,719 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:43,719 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:43,719 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496329928] [2021-05-22 02:29:43,719 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:43,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:43,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:43,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:43,719 INFO L87 Difference]: Start difference. First operand 476 states and 1494 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:43,966 INFO L93 Difference]: Finished difference Result 771 states and 2376 transitions. [2021-05-22 02:29:43,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:43,966 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:43,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:43,967 INFO L225 Difference]: With dead ends: 771 [2021-05-22 02:29:43,967 INFO L226 Difference]: Without dead ends: 740 [2021-05-22 02:29:43,967 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 173.1ms TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:43,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 740 states. [2021-05-22 02:29:43,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 740 to 474. [2021-05-22 02:29:43,972 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,973 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:29:43,973 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:29:43,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:43,973 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:29:43,973 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:43,973 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:29:43,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:43,974 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:43,974 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:44,174 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 697 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3792 [2021-05-22 02:29:44,174 INFO L430 AbstractCegarLoop]: === Iteration 709 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:44,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:44,174 INFO L82 PathProgramCache]: Analyzing trace with hash -1670259461, now seen corresponding path program 697 times [2021-05-22 02:29:44,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:44,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573281559] [2021-05-22 02:29:44,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:44,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:44,255 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:44,255 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:44,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573281559] [2021-05-22 02:29:44,255 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573281559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:44,255 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835926492] [2021-05-22 02:29:44,255 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 698 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 698 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:44,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:44,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:44,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:44,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:44,331 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,334 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:44,335 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,335 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:29:44,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:44,365 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:44,368 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:44,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,368 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:29:44,376 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:44,376 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835926492] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:44,376 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:44,376 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:44,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415271027] [2021-05-22 02:29:44,376 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:44,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:44,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:44,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:44,377 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:44,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:44,518 INFO L93 Difference]: Finished difference Result 647 states and 2002 transitions. [2021-05-22 02:29:44,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:44,519 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:44,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:44,520 INFO L225 Difference]: With dead ends: 647 [2021-05-22 02:29:44,520 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:29:44,520 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 127.9ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:44,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:29:44,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 480. [2021-05-22 02:29:44,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.152400835073069) internal successors, (1510), 479 states have internal predecessors, (1510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:44,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1510 transitions. [2021-05-22 02:29:44,525 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1510 transitions. Word has length 21 [2021-05-22 02:29:44,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:44,525 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1510 transitions. [2021-05-22 02:29:44,525 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:44,525 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1510 transitions. [2021-05-22 02:29:44,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:44,525 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:44,525 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:44,726 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3798,698 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:44,726 INFO L430 AbstractCegarLoop]: === Iteration 710 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:44,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:44,726 INFO L82 PathProgramCache]: Analyzing trace with hash 2122916499, now seen corresponding path program 698 times [2021-05-22 02:29:44,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:44,726 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1200406784] [2021-05-22 02:29:44,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:44,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:44,819 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:44,819 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:44,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1200406784] [2021-05-22 02:29:44,819 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1200406784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:44,819 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1879966076] [2021-05-22 02:29:44,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 699 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 699 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:44,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:44,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:44,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:44,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:44,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:44,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:44,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,955 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:44,956 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:44,957 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:29:44,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:44,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:44,983 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:44,992 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:44,994 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:44,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:44,994 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,002 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:45,003 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,003 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:29:45,022 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:45,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1879966076] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:45,023 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:45,023 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:45,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878055873] [2021-05-22 02:29:45,023 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:45,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:45,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:45,023 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:45,023 INFO L87 Difference]: Start difference. First operand 480 states and 1510 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:45,231 INFO L93 Difference]: Finished difference Result 638 states and 1978 transitions. [2021-05-22 02:29:45,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:45,232 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:45,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:45,232 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:29:45,233 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:29:45,233 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 179.3ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:45,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:29:45,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 477. [2021-05-22 02:29:45,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1470588235294117) internal successors, (1498), 476 states have internal predecessors, (1498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1498 transitions. [2021-05-22 02:29:45,238 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1498 transitions. Word has length 21 [2021-05-22 02:29:45,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:45,238 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1498 transitions. [2021-05-22 02:29:45,238 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,238 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1498 transitions. [2021-05-22 02:29:45,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:45,238 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:45,238 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:45,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 699 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3800 [2021-05-22 02:29:45,439 INFO L430 AbstractCegarLoop]: === Iteration 711 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:45,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:45,439 INFO L82 PathProgramCache]: Analyzing trace with hash 16132379, now seen corresponding path program 699 times [2021-05-22 02:29:45,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:45,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [418856056] [2021-05-22 02:29:45,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:45,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:45,522 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:45,522 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:45,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [418856056] [2021-05-22 02:29:45,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [418856056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:45,522 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [577552454] [2021-05-22 02:29:45,522 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 700 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 700 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:45,547 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:29:45,547 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:45,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:45,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:45,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:45,609 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:45,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:45,615 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:29:45,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:45,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:45,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,644 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:45,646 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:45,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:45,646 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,652 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:45,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:45,652 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:29:45,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:45,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [577552454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:45,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:45,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:45,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796479706] [2021-05-22 02:29:45,665 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:45,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:45,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:45,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:45,666 INFO L87 Difference]: Start difference. First operand 477 states and 1498 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:45,800 INFO L93 Difference]: Finished difference Result 641 states and 1984 transitions. [2021-05-22 02:29:45,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:45,800 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:45,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:45,801 INFO L225 Difference]: With dead ends: 641 [2021-05-22 02:29:45,801 INFO L226 Difference]: Without dead ends: 619 [2021-05-22 02:29:45,801 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 127.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:45,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 619 states. [2021-05-22 02:29:45,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 619 to 474. [2021-05-22 02:29:45,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:29:45,806 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:29:45,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:45,806 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:29:45,806 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:45,806 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:29:45,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:45,807 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:45,807 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:46,007 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 700 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3803 [2021-05-22 02:29:46,007 INFO L430 AbstractCegarLoop]: === Iteration 712 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:46,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:46,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1748885421, now seen corresponding path program 700 times [2021-05-22 02:29:46,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:46,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [769913298] [2021-05-22 02:29:46,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:46,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:46,087 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:46,087 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:46,087 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [769913298] [2021-05-22 02:29:46,087 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [769913298] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:46,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400440073] [2021-05-22 02:29:46,088 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 701 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 701 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:46,111 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:46,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:46,112 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:46,112 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:46,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:46,145 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:46,147 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,156 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:46,156 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:29:46,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:46,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,210 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:46,211 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,211 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:29:46,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:46,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [400440073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:46,219 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:46,219 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:46,219 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670032894] [2021-05-22 02:29:46,219 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:46,219 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:46,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:46,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:46,219 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:46,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:46,428 INFO L93 Difference]: Finished difference Result 655 states and 2025 transitions. [2021-05-22 02:29:46,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:46,428 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:46,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:46,429 INFO L225 Difference]: With dead ends: 655 [2021-05-22 02:29:46,429 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:29:46,429 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 162.7ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:46,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:29:46,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 480. [2021-05-22 02:29:46,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.150313152400835) internal successors, (1509), 479 states have internal predecessors, (1509), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:46,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1509 transitions. [2021-05-22 02:29:46,437 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1509 transitions. Word has length 21 [2021-05-22 02:29:46,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:46,437 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1509 transitions. [2021-05-22 02:29:46,437 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:46,437 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1509 transitions. [2021-05-22 02:29:46,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:46,438 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:46,438 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:46,656 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 701 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3805 [2021-05-22 02:29:46,657 INFO L430 AbstractCegarLoop]: === Iteration 713 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:46,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:46,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1247094085, now seen corresponding path program 701 times [2021-05-22 02:29:46,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:46,657 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896230879] [2021-05-22 02:29:46,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:46,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:46,737 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:46,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:46,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896230879] [2021-05-22 02:29:46,738 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896230879] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:46,738 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578425697] [2021-05-22 02:29:46,738 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 702 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 702 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:46,763 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:46,763 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:46,764 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:46,764 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:46,846 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_195], 1=[o_0]} [2021-05-22 02:29:46,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:46,850 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:46,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:46,868 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,880 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,882 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:46,882 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:29:46,944 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:46,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:46,945 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,953 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,955 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:46,956 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:46,956 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,964 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:46,965 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:46,965 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:29:46,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:46,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578425697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:46,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:46,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:46,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415340708] [2021-05-22 02:29:46,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:46,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:46,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:46,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:46,985 INFO L87 Difference]: Start difference. First operand 480 states and 1509 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:47,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:47,263 INFO L93 Difference]: Finished difference Result 646 states and 2001 transitions. [2021-05-22 02:29:47,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:47,263 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:47,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:47,264 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:29:47,264 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:29:47,265 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 237.3ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:29:47,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:29:47,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 477. [2021-05-22 02:29:47,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1449579831932772) internal successors, (1497), 476 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:47,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1497 transitions. [2021-05-22 02:29:47,271 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1497 transitions. Word has length 21 [2021-05-22 02:29:47,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:47,271 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1497 transitions. [2021-05-22 02:29:47,271 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:47,271 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1497 transitions. [2021-05-22 02:29:47,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:47,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:47,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:47,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3808,702 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:47,472 INFO L430 AbstractCegarLoop]: === Iteration 714 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:47,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:47,473 INFO L82 PathProgramCache]: Analyzing trace with hash 2062472997, now seen corresponding path program 702 times [2021-05-22 02:29:47,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:47,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992526300] [2021-05-22 02:29:47,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:47,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:47,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:47,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:47,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992526300] [2021-05-22 02:29:47,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1992526300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:47,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1694782431] [2021-05-22 02:29:47,571 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 703 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 703 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:47,595 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:47,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:47,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:47,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:47,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:47,658 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:47,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:47,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:47,660 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:47,678 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:47,680 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:47,680 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:29:47,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:47,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:47,756 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:47,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:47,767 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:47,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:47,767 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:47,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:47,776 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:47,776 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:13 [2021-05-22 02:29:47,820 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:47,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1694782431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:47,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:47,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:47,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440976827] [2021-05-22 02:29:47,821 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:47,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:47,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:47,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:47,821 INFO L87 Difference]: Start difference. First operand 477 states and 1497 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:48,092 INFO L93 Difference]: Finished difference Result 656 states and 2022 transitions. [2021-05-22 02:29:48,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:48,092 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:48,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:48,093 INFO L225 Difference]: With dead ends: 656 [2021-05-22 02:29:48,093 INFO L226 Difference]: Without dead ends: 637 [2021-05-22 02:29:48,093 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 238.2ms TimeCoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:48,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 637 states. [2021-05-22 02:29:48,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 637 to 473. [2021-05-22 02:29:48,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.13771186440678) internal successors, (1481), 472 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1481 transitions. [2021-05-22 02:29:48,098 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1481 transitions. Word has length 21 [2021-05-22 02:29:48,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:48,098 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1481 transitions. [2021-05-22 02:29:48,098 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,098 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1481 transitions. [2021-05-22 02:29:48,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:48,099 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:48,099 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:48,299 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 703 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3813 [2021-05-22 02:29:48,299 INFO L430 AbstractCegarLoop]: === Iteration 715 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:48,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:48,299 INFO L82 PathProgramCache]: Analyzing trace with hash 333511109, now seen corresponding path program 703 times [2021-05-22 02:29:48,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:48,300 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655763360] [2021-05-22 02:29:48,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:48,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:48,385 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:48,385 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:48,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655763360] [2021-05-22 02:29:48,385 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [655763360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:48,385 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1685582224] [2021-05-22 02:29:48,385 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 704 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 704 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:48,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:48,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:48,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:48,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:48,446 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:48,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:48,448 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:48,457 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:48,458 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:48,458 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:29:48,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:48,508 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:48,516 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:48,516 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:48,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:48,518 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:48,524 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:48,525 INFO L518 ElimStorePlain]: Eliminatee v_prenex_197 vanished before elimination [2021-05-22 02:29:48,525 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:48,525 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:29:48,542 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:48,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1685582224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:48,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:48,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:29:48,543 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969592] [2021-05-22 02:29:48,543 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:29:48,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:48,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:29:48,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:48,543 INFO L87 Difference]: Start difference. First operand 473 states and 1481 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:48,724 INFO L93 Difference]: Finished difference Result 662 states and 2044 transitions. [2021-05-22 02:29:48,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:48,724 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:48,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:48,730 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:29:48,730 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:29:48,730 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 155.9ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:48,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:29:48,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 470. [2021-05-22 02:29:48,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.140724946695096) internal successors, (1473), 469 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1473 transitions. [2021-05-22 02:29:48,735 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1473 transitions. Word has length 21 [2021-05-22 02:29:48,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:48,735 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1473 transitions. [2021-05-22 02:29:48,735 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:48,735 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1473 transitions. [2021-05-22 02:29:48,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:48,736 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:48,736 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:48,936 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3817,704 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:48,936 INFO L430 AbstractCegarLoop]: === Iteration 716 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:48,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:48,937 INFO L82 PathProgramCache]: Analyzing trace with hash -1385473573, now seen corresponding path program 704 times [2021-05-22 02:29:48,937 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:48,937 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511722834] [2021-05-22 02:29:48,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:48,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:49,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:49,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:49,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511722834] [2021-05-22 02:29:49,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511722834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:49,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525174121] [2021-05-22 02:29:49,027 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 705 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 705 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:49,052 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:49,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:49,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:49,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:49,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:49,087 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:49,089 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:49,098 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:29:49,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:49,124 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,135 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:29:49,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:49,137 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,145 INFO L518 ElimStorePlain]: Eliminatee v_prenex_199 vanished before elimination [2021-05-22 02:29:49,146 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:49,146 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:29:49,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:49,168 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525174121] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:49,168 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:49,168 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:29:49,168 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114753139] [2021-05-22 02:29:49,168 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:29:49,168 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:49,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:29:49,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:49,169 INFO L87 Difference]: Start difference. First operand 470 states and 1473 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:49,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:49,344 INFO L93 Difference]: Finished difference Result 665 states and 2052 transitions. [2021-05-22 02:29:49,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:49,344 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:49,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:49,345 INFO L225 Difference]: With dead ends: 665 [2021-05-22 02:29:49,345 INFO L226 Difference]: Without dead ends: 636 [2021-05-22 02:29:49,345 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 145.9ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:49,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 636 states. [2021-05-22 02:29:49,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 636 to 471. [2021-05-22 02:29:49,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.146808510638298) internal successors, (1479), 470 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:49,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1479 transitions. [2021-05-22 02:29:49,350 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1479 transitions. Word has length 21 [2021-05-22 02:29:49,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:49,350 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1479 transitions. [2021-05-22 02:29:49,350 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:49,350 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1479 transitions. [2021-05-22 02:29:49,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:49,351 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:49,351 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:49,551 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 705 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3825 [2021-05-22 02:29:49,551 INFO L430 AbstractCegarLoop]: === Iteration 717 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:49,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:49,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1088207163, now seen corresponding path program 705 times [2021-05-22 02:29:49,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:49,552 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56014629] [2021-05-22 02:29:49,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:49,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:49,648 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:49,648 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:49,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56014629] [2021-05-22 02:29:49,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [56014629] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:49,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1527245877] [2021-05-22 02:29:49,648 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 706 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 706 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:49,673 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:29:49,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:49,673 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:49,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:49,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:49,718 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:49,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:49,718 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:49,721 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,733 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:49,733 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:29:49,763 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:29:49,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:49,766 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:49,768 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,783 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,785 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:49,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:49,786 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:49,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:49,801 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:49,801 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:19 [2021-05-22 02:29:49,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:49,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1527245877] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:49,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:49,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:49,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592006102] [2021-05-22 02:29:49,872 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:49,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:49,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:49,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:49,872 INFO L87 Difference]: Start difference. First operand 471 states and 1479 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:50,085 INFO L93 Difference]: Finished difference Result 704 states and 2167 transitions. [2021-05-22 02:29:50,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:50,085 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:50,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:50,086 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:29:50,086 INFO L226 Difference]: Without dead ends: 681 [2021-05-22 02:29:50,086 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 235.1ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:50,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-05-22 02:29:50,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 469. [2021-05-22 02:29:50,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1367521367521367) internal successors, (1468), 468 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1468 transitions. [2021-05-22 02:29:50,091 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1468 transitions. Word has length 21 [2021-05-22 02:29:50,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:50,091 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1468 transitions. [2021-05-22 02:29:50,091 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,091 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1468 transitions. [2021-05-22 02:29:50,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:50,092 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:50,092 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:50,292 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3830,706 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:50,292 INFO L430 AbstractCegarLoop]: === Iteration 718 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:50,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:50,292 INFO L82 PathProgramCache]: Analyzing trace with hash 10913605, now seen corresponding path program 706 times [2021-05-22 02:29:50,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:50,292 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1867330237] [2021-05-22 02:29:50,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:50,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:50,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:50,381 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:50,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1867330237] [2021-05-22 02:29:50,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1867330237] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:50,381 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991179692] [2021-05-22 02:29:50,381 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 707 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 707 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:50,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:50,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:50,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:50,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:50,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:50,454 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:50,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:50,457 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:50,471 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:50,473 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:50,473 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:29:50,526 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:50,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:50,527 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:50,533 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:50,534 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:50,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:50,535 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:50,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:50,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:50,541 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:29:50,553 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:50,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991179692] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:50,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:50,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:50,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1596624144] [2021-05-22 02:29:50,554 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:50,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:50,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:50,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:50,554 INFO L87 Difference]: Start difference. First operand 469 states and 1468 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:50,699 INFO L93 Difference]: Finished difference Result 643 states and 1988 transitions. [2021-05-22 02:29:50,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:50,699 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:50,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:50,700 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:29:50,700 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:29:50,700 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 140.3ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:50,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:29:50,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 472. [2021-05-22 02:29:50,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.142250530785563) internal successors, (1480), 471 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1480 transitions. [2021-05-22 02:29:50,705 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1480 transitions. Word has length 21 [2021-05-22 02:29:50,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:50,705 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1480 transitions. [2021-05-22 02:29:50,705 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:50,705 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1480 transitions. [2021-05-22 02:29:50,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:50,706 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:50,706 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:50,906 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 707 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3838 [2021-05-22 02:29:50,906 INFO L430 AbstractCegarLoop]: === Iteration 719 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:50,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:50,906 INFO L82 PathProgramCache]: Analyzing trace with hash 636237723, now seen corresponding path program 707 times [2021-05-22 02:29:50,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:50,906 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191707585] [2021-05-22 02:29:50,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:50,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:51,002 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:51,002 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:51,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191707585] [2021-05-22 02:29:51,002 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191707585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:51,002 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235675243] [2021-05-22 02:29:51,002 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 708 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 708 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:51,027 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:51,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:51,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:51,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:51,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:51,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,078 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,079 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:51,079 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:29:51,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:51,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:51,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:51,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:51,145 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,159 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:51,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:51,160 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,171 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,172 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:51,172 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:29:51,219 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:51,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235675243] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:51,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:51,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:51,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124400769] [2021-05-22 02:29:51,220 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:51,220 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:51,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:51,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:51,220 INFO L87 Difference]: Start difference. First operand 472 states and 1480 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:51,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:51,427 INFO L93 Difference]: Finished difference Result 670 states and 2061 transitions. [2021-05-22 02:29:51,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:51,427 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:51,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:51,428 INFO L225 Difference]: With dead ends: 670 [2021-05-22 02:29:51,428 INFO L226 Difference]: Without dead ends: 643 [2021-05-22 02:29:51,428 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 184.5ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:51,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-22 02:29:51,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 472. [2021-05-22 02:29:51,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1380042462845013) internal successors, (1478), 471 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:51,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1478 transitions. [2021-05-22 02:29:51,434 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1478 transitions. Word has length 21 [2021-05-22 02:29:51,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:51,434 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1478 transitions. [2021-05-22 02:29:51,434 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:51,434 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1478 transitions. [2021-05-22 02:29:51,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:51,434 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:51,434 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:51,634 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3842,708 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:51,635 INFO L430 AbstractCegarLoop]: === Iteration 720 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:51,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:51,635 INFO L82 PathProgramCache]: Analyzing trace with hash 2060871251, now seen corresponding path program 708 times [2021-05-22 02:29:51,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:51,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775835522] [2021-05-22 02:29:51,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:51,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:51,716 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:51,716 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:51,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775835522] [2021-05-22 02:29:51,716 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775835522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:51,716 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758221767] [2021-05-22 02:29:51,716 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 709 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 709 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:51,741 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:29:51,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:51,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:51,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:51,780 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:51,781 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:51,783 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,792 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,792 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:51,792 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:29:51,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:51,818 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,828 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:51,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:51,831 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:51,839 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:51,839 INFO L518 ElimStorePlain]: Eliminatee v_prenex_201 vanished before elimination [2021-05-22 02:29:51,839 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:51,839 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:29:51,861 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:51,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [758221767] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:51,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:51,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:29:51,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617435762] [2021-05-22 02:29:51,861 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:29:51,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:51,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:29:51,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:51,861 INFO L87 Difference]: Start difference. First operand 472 states and 1478 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:52,009 INFO L93 Difference]: Finished difference Result 658 states and 2032 transitions. [2021-05-22 02:29:52,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:52,010 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:52,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:52,010 INFO L225 Difference]: With dead ends: 658 [2021-05-22 02:29:52,011 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:29:52,011 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 109.0ms TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:52,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:29:52,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 473. [2021-05-22 02:29:52,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1440677966101696) internal successors, (1484), 472 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1484 transitions. [2021-05-22 02:29:52,015 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1484 transitions. Word has length 21 [2021-05-22 02:29:52,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:52,015 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1484 transitions. [2021-05-22 02:29:52,016 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,016 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1484 transitions. [2021-05-22 02:29:52,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:52,016 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:52,016 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:52,216 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3850,709 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:52,217 INFO L430 AbstractCegarLoop]: === Iteration 721 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:52,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:52,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1936829635, now seen corresponding path program 709 times [2021-05-22 02:29:52,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:52,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [507261089] [2021-05-22 02:29:52,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:52,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:52,295 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:52,295 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:52,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [507261089] [2021-05-22 02:29:52,295 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [507261089] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:52,295 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1841579204] [2021-05-22 02:29:52,295 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 710 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 710 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:52,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:52,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:52,320 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:52,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:52,350 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,355 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:52,355 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,355 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:29:52,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:52,377 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:52,380 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,388 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:52,388 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:52,389 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:52,389 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:29:52,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:52,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1841579204] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:52,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:52,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:29:52,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126893631] [2021-05-22 02:29:52,438 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:29:52,438 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:52,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:29:52,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:52,438 INFO L87 Difference]: Start difference. First operand 473 states and 1484 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:52,620 INFO L93 Difference]: Finished difference Result 602 states and 1853 transitions. [2021-05-22 02:29:52,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:52,620 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:52,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:52,621 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:29:52,621 INFO L226 Difference]: Without dead ends: 579 [2021-05-22 02:29:52,621 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 133.5ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:52,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-05-22 02:29:52,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 468. [2021-05-22 02:29:52,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1349036402569594) internal successors, (1464), 467 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1464 transitions. [2021-05-22 02:29:52,626 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1464 transitions. Word has length 21 [2021-05-22 02:29:52,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:52,626 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1464 transitions. [2021-05-22 02:29:52,626 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:52,626 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1464 transitions. [2021-05-22 02:29:52,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:52,626 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:52,626 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:52,827 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3855,710 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:52,827 INFO L430 AbstractCegarLoop]: === Iteration 722 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:52,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:52,827 INFO L82 PathProgramCache]: Analyzing trace with hash -641220965, now seen corresponding path program 710 times [2021-05-22 02:29:52,827 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:52,827 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1437937063] [2021-05-22 02:29:52,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:52,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:52,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:52,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:52,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1437937063] [2021-05-22 02:29:52,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1437937063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:52,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720941479] [2021-05-22 02:29:52,899 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 711 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 711 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:52,923 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:52,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:52,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:52,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:52,958 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:52,958 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:52,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:52,959 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,961 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:52,962 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:52,974 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:52,975 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:52,975 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:29:52,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:52,997 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,000 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:53,000 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:53,001 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,001 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:29:53,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:53,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720941479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:53,014 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:53,014 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:29:53,014 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713662906] [2021-05-22 02:29:53,014 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:29:53,014 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:53,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:29:53,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:29:53,015 INFO L87 Difference]: Start difference. First operand 468 states and 1464 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:53,145 INFO L93 Difference]: Finished difference Result 839 states and 2583 transitions. [2021-05-22 02:29:53,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:53,146 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:53,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:53,147 INFO L225 Difference]: With dead ends: 839 [2021-05-22 02:29:53,147 INFO L226 Difference]: Without dead ends: 817 [2021-05-22 02:29:53,147 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 91.3ms TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:53,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 817 states. [2021-05-22 02:29:53,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 817 to 471. [2021-05-22 02:29:53,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1404255319148935) internal successors, (1476), 470 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1476 transitions. [2021-05-22 02:29:53,153 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1476 transitions. Word has length 21 [2021-05-22 02:29:53,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:53,153 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1476 transitions. [2021-05-22 02:29:53,153 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,153 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1476 transitions. [2021-05-22 02:29:53,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:53,153 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:53,153 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:53,354 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3861,711 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:53,354 INFO L430 AbstractCegarLoop]: === Iteration 723 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:53,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:53,354 INFO L82 PathProgramCache]: Analyzing trace with hash -362076569, now seen corresponding path program 711 times [2021-05-22 02:29:53,354 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:53,354 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427310611] [2021-05-22 02:29:53,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:53,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:53,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:53,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:53,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427310611] [2021-05-22 02:29:53,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427310611] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:53,442 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049068182] [2021-05-22 02:29:53,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 712 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 712 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:53,466 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:29:53,466 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:53,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:53,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:53,492 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:53,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:53,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,499 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:53,500 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:53,500 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:29:53,570 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:29:53,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:53,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:53,576 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:53,589 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:53,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:53,590 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:53,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:53,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:53,602 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:29:53,649 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:53,649 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049068182] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:53,649 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:53,650 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:53,650 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1434681617] [2021-05-22 02:29:53,650 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:53,650 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:53,650 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:53,650 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:53,650 INFO L87 Difference]: Start difference. First operand 471 states and 1476 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:53,932 INFO L93 Difference]: Finished difference Result 769 states and 2349 transitions. [2021-05-22 02:29:53,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:53,932 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:53,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:53,933 INFO L225 Difference]: With dead ends: 769 [2021-05-22 02:29:53,933 INFO L226 Difference]: Without dead ends: 738 [2021-05-22 02:29:53,933 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 14 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 207.2ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:29:53,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 738 states. [2021-05-22 02:29:53,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 738 to 473. [2021-05-22 02:29:53,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1461864406779663) internal successors, (1485), 472 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1485 transitions. [2021-05-22 02:29:53,939 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1485 transitions. Word has length 21 [2021-05-22 02:29:53,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:53,939 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1485 transitions. [2021-05-22 02:29:53,939 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:53,939 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1485 transitions. [2021-05-22 02:29:53,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:53,939 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:53,939 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:54,140 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 712 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3865 [2021-05-22 02:29:54,140 INFO L430 AbstractCegarLoop]: === Iteration 724 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:54,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:54,140 INFO L82 PathProgramCache]: Analyzing trace with hash 1486531183, now seen corresponding path program 712 times [2021-05-22 02:29:54,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:54,140 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612939494] [2021-05-22 02:29:54,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:54,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:54,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:54,216 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:54,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612939494] [2021-05-22 02:29:54,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612939494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:54,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1066011954] [2021-05-22 02:29:54,216 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 713 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 713 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:54,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:54,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:54,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:54,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:54,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:54,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:54,263 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,269 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:54,270 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:54,270 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:29:54,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:54,306 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,309 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:54,309 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:54,310 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,310 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:29:54,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:54,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1066011954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:54,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:54,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:29:54,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847533758] [2021-05-22 02:29:54,323 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:29:54,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:54,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:29:54,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:29:54,323 INFO L87 Difference]: Start difference. First operand 473 states and 1485 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:54,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:54,489 INFO L93 Difference]: Finished difference Result 758 states and 2340 transitions. [2021-05-22 02:29:54,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:54,489 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:54,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:54,490 INFO L225 Difference]: With dead ends: 758 [2021-05-22 02:29:54,490 INFO L226 Difference]: Without dead ends: 736 [2021-05-22 02:29:54,490 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 104.2ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:54,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 736 states. [2021-05-22 02:29:54,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 736 to 475. [2021-05-22 02:29:54,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1434599156118144) internal successors, (1490), 474 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:54,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1490 transitions. [2021-05-22 02:29:54,495 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1490 transitions. Word has length 21 [2021-05-22 02:29:54,495 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:54,495 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1490 transitions. [2021-05-22 02:29:54,495 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:54,495 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1490 transitions. [2021-05-22 02:29:54,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:54,496 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:54,496 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:54,696 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3869,713 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:54,696 INFO L430 AbstractCegarLoop]: === Iteration 725 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:54,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:54,697 INFO L82 PathProgramCache]: Analyzing trace with hash -758478467, now seen corresponding path program 713 times [2021-05-22 02:29:54,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:54,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1632572476] [2021-05-22 02:29:54,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:54,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:54,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:54,773 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:54,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1632572476] [2021-05-22 02:29:54,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1632572476] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:54,773 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [742487357] [2021-05-22 02:29:54,773 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 714 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 714 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:54,798 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:54,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:54,799 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:54,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:54,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:54,825 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:54,827 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,833 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:54,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:54,834 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:29:54,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:54,873 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:54,876 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:54,886 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:54,887 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:29:54,887 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:54,887 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:29:54,909 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:54,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [742487357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:54,909 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:54,909 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:29:54,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236562118] [2021-05-22 02:29:54,909 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:29:54,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:54,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:29:54,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:29:54,909 INFO L87 Difference]: Start difference. First operand 475 states and 1490 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:55,079 INFO L93 Difference]: Finished difference Result 769 states and 2367 transitions. [2021-05-22 02:29:55,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:55,079 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:55,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:55,080 INFO L225 Difference]: With dead ends: 769 [2021-05-22 02:29:55,080 INFO L226 Difference]: Without dead ends: 740 [2021-05-22 02:29:55,080 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 112.2ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:29:55,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 740 states. [2021-05-22 02:29:55,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 740 to 467. [2021-05-22 02:29:55,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.133047210300429) internal successors, (1460), 466 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1460 transitions. [2021-05-22 02:29:55,086 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1460 transitions. Word has length 21 [2021-05-22 02:29:55,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:55,086 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1460 transitions. [2021-05-22 02:29:55,086 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,086 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1460 transitions. [2021-05-22 02:29:55,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:55,086 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:55,086 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:55,287 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3872,714 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:55,287 INFO L430 AbstractCegarLoop]: === Iteration 726 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:55,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:55,287 INFO L82 PathProgramCache]: Analyzing trace with hash -687354771, now seen corresponding path program 714 times [2021-05-22 02:29:55,287 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:55,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019605763] [2021-05-22 02:29:55,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:55,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:55,386 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:55,387 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:55,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019605763] [2021-05-22 02:29:55,387 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019605763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:55,387 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [287663097] [2021-05-22 02:29:55,387 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 715 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 715 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:55,411 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:29:55,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:55,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:55,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:55,470 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:55,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:55,471 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:55,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:55,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:55,476 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:29:55,511 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:29:55,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:55,513 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:55,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:55,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:55,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:55,520 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:55,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:55,525 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:55,525 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:9 [2021-05-22 02:29:55,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:55,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [287663097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:55,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:55,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:29:55,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [534535622] [2021-05-22 02:29:55,534 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:29:55,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:55,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:29:55,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:55,534 INFO L87 Difference]: Start difference. First operand 467 states and 1460 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:55,679 INFO L93 Difference]: Finished difference Result 548 states and 1693 transitions. [2021-05-22 02:29:55,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:55,679 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:55,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:55,680 INFO L225 Difference]: With dead ends: 548 [2021-05-22 02:29:55,680 INFO L226 Difference]: Without dead ends: 526 [2021-05-22 02:29:55,680 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:29:55,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 526 states. [2021-05-22 02:29:55,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 526 to 473. [2021-05-22 02:29:55,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.13771186440678) internal successors, (1481), 472 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1481 transitions. [2021-05-22 02:29:55,684 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1481 transitions. Word has length 21 [2021-05-22 02:29:55,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:55,684 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1481 transitions. [2021-05-22 02:29:55,684 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:55,684 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1481 transitions. [2021-05-22 02:29:55,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:55,685 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:55,685 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:55,885 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3876,715 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:55,885 INFO L430 AbstractCegarLoop]: === Iteration 727 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:55,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:55,886 INFO L82 PathProgramCache]: Analyzing trace with hash -1189146107, now seen corresponding path program 715 times [2021-05-22 02:29:55,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:55,886 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [577745326] [2021-05-22 02:29:55,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:55,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:55,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:55,979 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:55,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [577745326] [2021-05-22 02:29:55,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [577745326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:55,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1624347268] [2021-05-22 02:29:55,979 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 716 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 716 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:56,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:56,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:56,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:56,096 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:56,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:56,097 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,105 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:56,105 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:29:56,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:56,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:56,132 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:56,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:56,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,151 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,151 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,151 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:29:56,170 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:56,170 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1624347268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:56,170 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:56,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:56,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916537708] [2021-05-22 02:29:56,170 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:56,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:56,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:56,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:56,171 INFO L87 Difference]: Start difference. First operand 473 states and 1481 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:56,337 INFO L93 Difference]: Finished difference Result 557 states and 1717 transitions. [2021-05-22 02:29:56,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:56,337 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:56,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:56,338 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:29:56,338 INFO L226 Difference]: Without dead ends: 535 [2021-05-22 02:29:56,338 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 159.8ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:56,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-22 02:29:56,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 470. [2021-05-22 02:29:56,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1321961620469083) internal successors, (1469), 469 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1469 transitions. [2021-05-22 02:29:56,343 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1469 transitions. Word has length 21 [2021-05-22 02:29:56,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:56,343 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1469 transitions. [2021-05-22 02:29:56,343 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,343 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1469 transitions. [2021-05-22 02:29:56,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:56,343 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:56,343 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:56,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 716 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3878 [2021-05-22 02:29:56,544 INFO L430 AbstractCegarLoop]: === Iteration 728 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:56,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:56,544 INFO L82 PathProgramCache]: Analyzing trace with hash 999037069, now seen corresponding path program 716 times [2021-05-22 02:29:56,544 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:56,544 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205319316] [2021-05-22 02:29:56,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:56,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:56,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:56,635 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:56,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205319316] [2021-05-22 02:29:56,635 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205319316] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:56,635 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1325185911] [2021-05-22 02:29:56,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 717 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 717 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:56,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:56,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:56,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:56,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:56,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:56,719 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,725 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,726 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:56,726 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:29:56,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:56,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:56,749 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,755 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:56,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:29:56,757 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:56,763 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:56,763 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:29:56,776 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:56,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1325185911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:56,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:56,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:29:56,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707940122] [2021-05-22 02:29:56,777 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:29:56,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:56,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:29:56,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:56,777 INFO L87 Difference]: Start difference. First operand 470 states and 1469 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:56,924 INFO L93 Difference]: Finished difference Result 545 states and 1684 transitions. [2021-05-22 02:29:56,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:29:56,924 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:56,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:56,925 INFO L225 Difference]: With dead ends: 545 [2021-05-22 02:29:56,925 INFO L226 Difference]: Without dead ends: 523 [2021-05-22 02:29:56,925 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 134.2ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:29:56,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-22 02:29:56,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 467. [2021-05-22 02:29:56,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.133047210300429) internal successors, (1460), 466 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1460 transitions. [2021-05-22 02:29:56,930 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1460 transitions. Word has length 21 [2021-05-22 02:29:56,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:56,930 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1460 transitions. [2021-05-22 02:29:56,930 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:56,930 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1460 transitions. [2021-05-22 02:29:56,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:56,930 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:56,930 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:57,131 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 717 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3881 [2021-05-22 02:29:57,131 INFO L430 AbstractCegarLoop]: === Iteration 729 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:57,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:57,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1517823703, now seen corresponding path program 717 times [2021-05-22 02:29:57,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:57,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1884890404] [2021-05-22 02:29:57,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:57,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:57,231 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:57,231 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:57,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1884890404] [2021-05-22 02:29:57,231 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1884890404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:57,231 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2016856583] [2021-05-22 02:29:57,231 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 718 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 718 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:57,257 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:29:57,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:57,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:57,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:57,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:57,344 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:57,345 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:57,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:57,346 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:57,361 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:57,362 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:57,363 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:29:57,426 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:57,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:57,427 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:57,434 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:57,436 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:57,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:57,437 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:57,444 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:57,445 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:29:57,445 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:7 [2021-05-22 02:29:57,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:57,473 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2016856583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:57,473 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:57,473 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:57,473 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575973250] [2021-05-22 02:29:57,473 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:57,473 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:57,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:57,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:57,473 INFO L87 Difference]: Start difference. First operand 467 states and 1460 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:57,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:57,664 INFO L93 Difference]: Finished difference Result 612 states and 1891 transitions. [2021-05-22 02:29:57,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:57,664 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:57,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:57,665 INFO L225 Difference]: With dead ends: 612 [2021-05-22 02:29:57,665 INFO L226 Difference]: Without dead ends: 593 [2021-05-22 02:29:57,665 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 194.2ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:57,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-05-22 02:29:57,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 469. [2021-05-22 02:29:57,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1346153846153846) internal successors, (1467), 468 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:57,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1467 transitions. [2021-05-22 02:29:57,670 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1467 transitions. Word has length 21 [2021-05-22 02:29:57,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:57,670 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1467 transitions. [2021-05-22 02:29:57,670 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:57,670 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1467 transitions. [2021-05-22 02:29:57,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:57,671 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:57,671 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:57,871 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3883,718 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:57,871 INFO L430 AbstractCegarLoop]: === Iteration 730 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:57,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:57,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1295615091, now seen corresponding path program 718 times [2021-05-22 02:29:57,871 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:57,871 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [691428805] [2021-05-22 02:29:57,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:57,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:57,968 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:57,968 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:57,968 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [691428805] [2021-05-22 02:29:57,968 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [691428805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:57,969 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [109169601] [2021-05-22 02:29:57,969 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 719 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 719 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:57,993 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:29:57,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:57,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:57,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:58,068 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,069 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:58,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,076 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:58,078 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:29:58,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:58,154 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,156 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:58,157 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,170 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,172 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,172 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:58,173 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,184 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,185 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:58,185 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:53, output treesize:5 [2021-05-22 02:29:58,218 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:58,218 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [109169601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:58,218 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:58,218 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:58,218 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570688280] [2021-05-22 02:29:58,218 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:58,218 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:58,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:58,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:58,219 INFO L87 Difference]: Start difference. First operand 469 states and 1467 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:58,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:58,489 INFO L93 Difference]: Finished difference Result 768 states and 2340 transitions. [2021-05-22 02:29:58,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:29:58,490 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:58,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:58,491 INFO L225 Difference]: With dead ends: 768 [2021-05-22 02:29:58,491 INFO L226 Difference]: Without dead ends: 708 [2021-05-22 02:29:58,491 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 206.9ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:29:58,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2021-05-22 02:29:58,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 469. [2021-05-22 02:29:58,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1303418803418803) internal successors, (1465), 468 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:58,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1465 transitions. [2021-05-22 02:29:58,496 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1465 transitions. Word has length 21 [2021-05-22 02:29:58,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:58,496 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1465 transitions. [2021-05-22 02:29:58,496 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:58,496 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1465 transitions. [2021-05-22 02:29:58,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:58,497 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:58,497 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:58,697 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 719 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3891 [2021-05-22 02:29:58,697 INFO L430 AbstractCegarLoop]: === Iteration 731 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:58,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:58,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1090751753, now seen corresponding path program 719 times [2021-05-22 02:29:58,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:58,697 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [232851805] [2021-05-22 02:29:58,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:58,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:58,797 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:58,797 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:58,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [232851805] [2021-05-22 02:29:58,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [232851805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:58,797 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706716360] [2021-05-22 02:29:58,797 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 720 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 720 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:58,822 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:29:58,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:58,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:58,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:58,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,906 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:29:58,907 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:58,910 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,924 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,926 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:29:58,926 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:29:58,965 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,966 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:58,967 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:29:58,970 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:58,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:58,985 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:58,998 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:58,999 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:58,999 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:29:59,046 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:59,046 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706716360] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:59,046 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:59,046 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:59,046 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805579969] [2021-05-22 02:29:59,046 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:59,046 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:59,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:59,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:59,047 INFO L87 Difference]: Start difference. First operand 469 states and 1465 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:59,279 INFO L93 Difference]: Finished difference Result 654 states and 2026 transitions. [2021-05-22 02:29:59,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:59,279 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:59,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:59,280 INFO L225 Difference]: With dead ends: 654 [2021-05-22 02:29:59,280 INFO L226 Difference]: Without dead ends: 631 [2021-05-22 02:29:59,280 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 196.3ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:59,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-05-22 02:29:59,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 467. [2021-05-22 02:29:59,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.133047210300429) internal successors, (1460), 466 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1460 transitions. [2021-05-22 02:29:59,285 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1460 transitions. Word has length 21 [2021-05-22 02:29:59,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:59,285 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1460 transitions. [2021-05-22 02:29:59,285 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,286 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1460 transitions. [2021-05-22 02:29:59,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:59,286 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:59,286 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:29:59,486 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3901,720 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:59,487 INFO L430 AbstractCegarLoop]: === Iteration 732 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:29:59,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:29:59,487 INFO L82 PathProgramCache]: Analyzing trace with hash -1976550033, now seen corresponding path program 720 times [2021-05-22 02:29:59,487 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:29:59,487 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1548879624] [2021-05-22 02:29:59,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:29:59,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:29:59,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:59,587 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:29:59,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1548879624] [2021-05-22 02:29:59,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1548879624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:59,587 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211862381] [2021-05-22 02:29:59,587 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 721 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 721 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:29:59,613 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:29:59,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:29:59,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:29:59,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:29:59,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:59,676 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:59,682 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:59,683 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:29:59,683 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:29:59,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:29:59,718 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:59,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:59,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:29:59,720 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:59,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:59,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:29:59,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:29:59,735 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:29:59,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:29:59,747 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:29:59,747 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:29:59,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:29:59,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211862381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:29:59,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:29:59,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:29:59,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295883789] [2021-05-22 02:29:59,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:29:59,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:29:59,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:29:59,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:29:59,794 INFO L87 Difference]: Start difference. First operand 467 states and 1460 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:29:59,943 INFO L93 Difference]: Finished difference Result 621 states and 1915 transitions. [2021-05-22 02:29:59,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:29:59,944 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:29:59,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:29:59,944 INFO L225 Difference]: With dead ends: 621 [2021-05-22 02:29:59,944 INFO L226 Difference]: Without dead ends: 594 [2021-05-22 02:29:59,945 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 184.5ms TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:29:59,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-05-22 02:29:59,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 469. [2021-05-22 02:29:59,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1303418803418803) internal successors, (1465), 468 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1465 transitions. [2021-05-22 02:29:59,949 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1465 transitions. Word has length 21 [2021-05-22 02:29:59,949 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:29:59,950 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1465 transitions. [2021-05-22 02:29:59,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:29:59,950 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1465 transitions. [2021-05-22 02:29:59,950 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:29:59,950 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:29:59,950 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:00,150 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 721 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3911 [2021-05-22 02:30:00,151 INFO L430 AbstractCegarLoop]: === Iteration 733 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:00,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:00,151 INFO L82 PathProgramCache]: Analyzing trace with hash 2034154579, now seen corresponding path program 721 times [2021-05-22 02:30:00,151 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:00,151 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834305632] [2021-05-22 02:30:00,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:00,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:00,249 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:00,249 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:00,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834305632] [2021-05-22 02:30:00,249 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834305632] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:00,249 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410345981] [2021-05-22 02:30:00,249 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 722 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 722 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:00,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:00,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:00,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:00,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:00,343 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:00,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:00,346 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:00,357 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:00,358 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:00,358 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:25 [2021-05-22 02:30:00,391 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_202, v_prenex_203], 1=[o_0, o_2]} [2021-05-22 02:30:00,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:00,394 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:00,404 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:00,404 INFO L518 ElimStorePlain]: Eliminatee v_prenex_203 vanished before elimination [2021-05-22 02:30:00,405 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:00,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:00,406 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:00,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:00,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:00,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:00,417 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:00,425 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:00,426 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:00,426 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:30:00,475 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:00,475 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410345981] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:00,476 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:00,476 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:00,476 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456119621] [2021-05-22 02:30:00,476 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:00,476 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:00,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:00,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:00,476 INFO L87 Difference]: Start difference. First operand 469 states and 1465 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:00,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:00,702 INFO L93 Difference]: Finished difference Result 675 states and 2082 transitions. [2021-05-22 02:30:00,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:00,702 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:00,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:00,703 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:30:00,703 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 02:30:00,703 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 214.3ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:00,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 02:30:00,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 465. [2021-05-22 02:30:00,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1357758620689653) internal successors, (1455), 464 states have internal predecessors, (1455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:00,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1455 transitions. [2021-05-22 02:30:00,708 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1455 transitions. Word has length 21 [2021-05-22 02:30:00,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:00,708 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1455 transitions. [2021-05-22 02:30:00,708 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:00,708 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1455 transitions. [2021-05-22 02:30:00,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:00,709 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:00,709 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:00,909 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 722 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3918 [2021-05-22 02:30:00,909 INFO L430 AbstractCegarLoop]: === Iteration 734 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:00,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:00,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1563177185, now seen corresponding path program 722 times [2021-05-22 02:30:00,909 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:00,909 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038630452] [2021-05-22 02:30:00,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:00,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:01,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:01,007 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:01,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038630452] [2021-05-22 02:30:01,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038630452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:01,007 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [932696020] [2021-05-22 02:30:01,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 723 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 723 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:01,030 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:01,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:01,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:01,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:01,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:01,074 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,076 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:01,076 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:01,076 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,088 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,088 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:01,088 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:01,147 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:30:01,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:01,149 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,155 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:01,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:01,156 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,161 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,161 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,161 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:9 [2021-05-22 02:30:01,169 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:01,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [932696020] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:01,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:01,170 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:01,170 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291652449] [2021-05-22 02:30:01,170 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:01,170 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:01,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:01,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:01,170 INFO L87 Difference]: Start difference. First operand 465 states and 1455 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:01,297 INFO L93 Difference]: Finished difference Result 596 states and 1840 transitions. [2021-05-22 02:30:01,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:01,297 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:01,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:01,298 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:30:01,298 INFO L226 Difference]: Without dead ends: 574 [2021-05-22 02:30:01,298 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 157.7ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:01,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2021-05-22 02:30:01,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 472. [2021-05-22 02:30:01,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.148619957537155) internal successors, (1483), 471 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1483 transitions. [2021-05-22 02:30:01,303 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1483 transitions. Word has length 21 [2021-05-22 02:30:01,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:01,303 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1483 transitions. [2021-05-22 02:30:01,303 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,303 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1483 transitions. [2021-05-22 02:30:01,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:01,304 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:01,304 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:01,504 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3931,723 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:01,504 INFO L430 AbstractCegarLoop]: === Iteration 735 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:01,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:01,505 INFO L82 PathProgramCache]: Analyzing trace with hash -2064968521, now seen corresponding path program 723 times [2021-05-22 02:30:01,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:01,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428606996] [2021-05-22 02:30:01,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:01,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:01,607 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:01,608 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:01,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428606996] [2021-05-22 02:30:01,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428606996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:01,608 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [879880991] [2021-05-22 02:30:01,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 724 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 724 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:01,633 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:30:01,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:01,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:01,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:01,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:01,678 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:01,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:01,681 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,692 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,693 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:01,693 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:01,736 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:30:01,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:01,738 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,744 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,746 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:01,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:01,747 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,753 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:01,753 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:01,753 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:30:01,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:01,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [879880991] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:01,767 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:01,767 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:01,767 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285533593] [2021-05-22 02:30:01,767 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:01,767 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:01,767 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:01,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:01,768 INFO L87 Difference]: Start difference. First operand 472 states and 1483 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:01,915 INFO L93 Difference]: Finished difference Result 587 states and 1816 transitions. [2021-05-22 02:30:01,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:01,915 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:01,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:01,916 INFO L225 Difference]: With dead ends: 587 [2021-05-22 02:30:01,916 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:30:01,916 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:01,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:30:01,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 469. [2021-05-22 02:30:01,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.143162393162393) internal successors, (1471), 468 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1471 transitions. [2021-05-22 02:30:01,921 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1471 transitions. Word has length 21 [2021-05-22 02:30:01,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:01,921 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1471 transitions. [2021-05-22 02:30:01,921 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:01,921 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1471 transitions. [2021-05-22 02:30:01,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:01,922 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:01,922 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:02,122 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 724 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3934 [2021-05-22 02:30:02,122 INFO L430 AbstractCegarLoop]: === Iteration 736 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:02,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:02,122 INFO L82 PathProgramCache]: Analyzing trace with hash -937853067, now seen corresponding path program 724 times [2021-05-22 02:30:02,123 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:02,123 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501851612] [2021-05-22 02:30:02,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:02,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:02,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:02,216 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:02,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501851612] [2021-05-22 02:30:02,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501851612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:02,216 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [849692677] [2021-05-22 02:30:02,216 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 725 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 725 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:02,240 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:02,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:02,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:02,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:02,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:02,298 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:02,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:02,299 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:02,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:02,301 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:02,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:02,321 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:02,321 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:30:02,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:02,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:02,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:02,446 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:02,447 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:02,448 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:02,448 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:02,455 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:02,455 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:02,455 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:7 [2021-05-22 02:30:02,469 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:02,469 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [849692677] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:02,469 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:02,469 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:02,469 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776998528] [2021-05-22 02:30:02,469 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:02,469 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:02,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:02,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:02,470 INFO L87 Difference]: Start difference. First operand 469 states and 1471 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:02,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:02,652 INFO L93 Difference]: Finished difference Result 575 states and 1765 transitions. [2021-05-22 02:30:02,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:02,652 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:02,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:02,653 INFO L225 Difference]: With dead ends: 575 [2021-05-22 02:30:02,653 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:30:02,653 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 189.2ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:02,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:30:02,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 475. [2021-05-22 02:30:02,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.151898734177215) internal successors, (1494), 474 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:02,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1494 transitions. [2021-05-22 02:30:02,658 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1494 transitions. Word has length 21 [2021-05-22 02:30:02,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:02,658 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1494 transitions. [2021-05-22 02:30:02,658 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:02,658 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1494 transitions. [2021-05-22 02:30:02,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:02,659 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:02,659 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:02,859 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 725 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3937 [2021-05-22 02:30:02,859 INFO L430 AbstractCegarLoop]: === Iteration 737 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:02,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:02,859 INFO L82 PathProgramCache]: Analyzing trace with hash -1160061679, now seen corresponding path program 725 times [2021-05-22 02:30:02,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:02,860 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279476729] [2021-05-22 02:30:02,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:02,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:02,938 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:02,938 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:02,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279476729] [2021-05-22 02:30:02,938 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279476729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:02,938 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1023269391] [2021-05-22 02:30:02,938 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 726 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 726 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:02,963 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:02,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:02,964 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:02,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:03,011 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:03,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,020 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,021 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:03,021 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:30:03,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:03,125 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:03,128 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,140 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:03,142 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,153 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,154 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:03,155 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:53, output treesize:5 [2021-05-22 02:30:03,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:03,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1023269391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:03,162 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:03,162 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:03,162 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233954736] [2021-05-22 02:30:03,162 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:03,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:03,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:03,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:03,163 INFO L87 Difference]: Start difference. First operand 475 states and 1494 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:03,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:03,366 INFO L93 Difference]: Finished difference Result 584 states and 1799 transitions. [2021-05-22 02:30:03,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:03,366 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:03,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:03,367 INFO L225 Difference]: With dead ends: 584 [2021-05-22 02:30:03,367 INFO L226 Difference]: Without dead ends: 551 [2021-05-22 02:30:03,367 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 142.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:03,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2021-05-22 02:30:03,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 475. [2021-05-22 02:30:03,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1413502109704643) internal successors, (1489), 474 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:03,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1489 transitions. [2021-05-22 02:30:03,377 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1489 transitions. Word has length 21 [2021-05-22 02:30:03,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:03,377 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1489 transitions. [2021-05-22 02:30:03,377 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:03,377 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1489 transitions. [2021-05-22 02:30:03,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:03,378 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:03,378 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:03,578 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 726 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3950 [2021-05-22 02:30:03,578 INFO L430 AbstractCegarLoop]: === Iteration 738 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:03,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:03,579 INFO L82 PathProgramCache]: Analyzing trace with hash 748538773, now seen corresponding path program 726 times [2021-05-22 02:30:03,579 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:03,579 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131519673] [2021-05-22 02:30:03,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:03,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:03,671 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:03,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:03,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131519673] [2021-05-22 02:30:03,671 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131519673] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:03,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848801586] [2021-05-22 02:30:03,672 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 727 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 727 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:03,696 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:03,696 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:03,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:03,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:03,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,753 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:03,754 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:03,757 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,775 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,776 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:03,777 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:30:03,867 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,868 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:03,869 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:03,872 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:03,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:03,888 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:03,901 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:03,902 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:03,902 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:30:03,936 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:03,936 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [848801586] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:03,936 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:03,936 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:03,936 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336941431] [2021-05-22 02:30:03,937 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:03,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:03,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:03,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:03,937 INFO L87 Difference]: Start difference. First operand 475 states and 1489 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:04,150 INFO L93 Difference]: Finished difference Result 603 states and 1864 transitions. [2021-05-22 02:30:04,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:04,150 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:04,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:04,151 INFO L225 Difference]: With dead ends: 603 [2021-05-22 02:30:04,151 INFO L226 Difference]: Without dead ends: 580 [2021-05-22 02:30:04,151 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 180.3ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:04,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-22 02:30:04,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 475. [2021-05-22 02:30:04,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1413502109704643) internal successors, (1489), 474 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1489 transitions. [2021-05-22 02:30:04,156 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1489 transitions. Word has length 21 [2021-05-22 02:30:04,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:04,156 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1489 transitions. [2021-05-22 02:30:04,156 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,156 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1489 transitions. [2021-05-22 02:30:04,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:04,157 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:04,157 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:04,357 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3960,727 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:04,357 INFO L430 AbstractCegarLoop]: === Iteration 739 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:04,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:04,357 INFO L82 PathProgramCache]: Analyzing trace with hash 464276089, now seen corresponding path program 727 times [2021-05-22 02:30:04,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:04,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492547020] [2021-05-22 02:30:04,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:04,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:04,441 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:04,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492547020] [2021-05-22 02:30:04,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492547020] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:04,441 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249766955] [2021-05-22 02:30:04,441 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 728 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 728 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:04,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:04,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:04,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:04,514 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:04,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:04,515 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:04,523 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:04,524 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:04,524 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:30:04,601 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:04,601 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:04,602 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:04,602 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:04,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:04,605 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:04,619 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:04,621 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:04,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:04,622 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:04,635 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:04,637 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:04,637 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:30:04,656 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:04,656 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249766955] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:04,656 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:04,656 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:04,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429116433] [2021-05-22 02:30:04,656 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:04,656 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:04,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:04,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:04,657 INFO L87 Difference]: Start difference. First operand 475 states and 1489 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:04,864 INFO L93 Difference]: Finished difference Result 574 states and 1771 transitions. [2021-05-22 02:30:04,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:04,864 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:04,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:04,865 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:30:04,865 INFO L226 Difference]: Without dead ends: 547 [2021-05-22 02:30:04,865 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 147.4ms TimeCoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:04,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-05-22 02:30:04,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 473. [2021-05-22 02:30:04,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1440677966101696) internal successors, (1484), 472 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1484 transitions. [2021-05-22 02:30:04,870 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1484 transitions. Word has length 21 [2021-05-22 02:30:04,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:04,870 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1484 transitions. [2021-05-22 02:30:04,870 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:04,870 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1484 transitions. [2021-05-22 02:30:04,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:04,871 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:04,871 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:05,071 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3970,728 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:05,071 INFO L430 AbstractCegarLoop]: === Iteration 740 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:05,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:05,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1249589609, now seen corresponding path program 728 times [2021-05-22 02:30:05,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:05,071 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871083406] [2021-05-22 02:30:05,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:05,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:05,180 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:05,180 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:05,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871083406] [2021-05-22 02:30:05,180 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871083406] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:05,180 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16884323] [2021-05-22 02:30:05,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 729 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 729 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:05,205 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:05,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:05,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:05,206 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:05,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:05,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:05,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:05,252 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:05,255 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:05,267 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:05,267 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:30:05,313 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:30:05,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:05,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,321 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:05,323 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:05,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:05,324 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,329 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:05,330 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,330 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:10 [2021-05-22 02:30:05,373 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:05,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16884323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:05,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:05,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:05,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148659200] [2021-05-22 02:30:05,374 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:05,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:05,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:05,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:05,374 INFO L87 Difference]: Start difference. First operand 473 states and 1484 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:05,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:05,604 INFO L93 Difference]: Finished difference Result 614 states and 1893 transitions. [2021-05-22 02:30:05,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:05,605 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:05,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:05,606 INFO L225 Difference]: With dead ends: 614 [2021-05-22 02:30:05,606 INFO L226 Difference]: Without dead ends: 595 [2021-05-22 02:30:05,606 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 199.9ms TimeCoverageRelationStatistics Valid=59, Invalid=283, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:05,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2021-05-22 02:30:05,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 469. [2021-05-22 02:30:05,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1367521367521367) internal successors, (1468), 468 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:05,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1468 transitions. [2021-05-22 02:30:05,611 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1468 transitions. Word has length 21 [2021-05-22 02:30:05,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:05,611 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1468 transitions. [2021-05-22 02:30:05,611 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:05,611 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1468 transitions. [2021-05-22 02:30:05,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:05,612 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:05,612 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:05,812 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3981,729 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:05,812 INFO L430 AbstractCegarLoop]: === Iteration 741 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:05,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:05,812 INFO L82 PathProgramCache]: Analyzing trace with hash 1316415799, now seen corresponding path program 729 times [2021-05-22 02:30:05,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:05,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676739127] [2021-05-22 02:30:05,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:05,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:05,914 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:05,914 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:05,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676739127] [2021-05-22 02:30:05,914 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676739127] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:05,914 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976939942] [2021-05-22 02:30:05,914 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 730 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 730 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:05,939 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:05,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:05,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:05,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:05,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:05,983 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,985 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:05,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:05,986 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:05,997 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:05,997 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:05,997 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:06,053 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:30:06,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:06,057 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:06,059 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,071 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:06,073 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:06,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:06,074 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,085 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:06,086 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:06,086 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:30:06,111 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:06,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1976939942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:06,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:06,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:06,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495655196] [2021-05-22 02:30:06,112 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:06,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:06,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:06,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:06,112 INFO L87 Difference]: Start difference. First operand 469 states and 1468 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:06,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:06,299 INFO L93 Difference]: Finished difference Result 605 states and 1868 transitions. [2021-05-22 02:30:06,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:06,299 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:06,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:06,300 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:30:06,300 INFO L226 Difference]: Without dead ends: 576 [2021-05-22 02:30:06,300 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 166.6ms TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:06,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-22 02:30:06,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 469. [2021-05-22 02:30:06,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1367521367521367) internal successors, (1468), 468 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:06,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1468 transitions. [2021-05-22 02:30:06,305 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1468 transitions. Word has length 21 [2021-05-22 02:30:06,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:06,305 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1468 transitions. [2021-05-22 02:30:06,305 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:06,305 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1468 transitions. [2021-05-22 02:30:06,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:06,305 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:06,305 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:06,506 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3984,730 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:06,506 INFO L430 AbstractCegarLoop]: === Iteration 742 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:06,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:06,506 INFO L82 PathProgramCache]: Analyzing trace with hash 221716881, now seen corresponding path program 730 times [2021-05-22 02:30:06,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:06,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1707383167] [2021-05-22 02:30:06,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:06,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:06,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:06,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:06,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1707383167] [2021-05-22 02:30:06,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1707383167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:06,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830310329] [2021-05-22 02:30:06,604 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 731 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 731 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:06,629 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:06,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:06,629 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:06,630 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:06,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:06,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:06,678 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,686 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:06,687 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:06,688 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:30:06,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:06,763 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:06,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:06,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,780 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:06,782 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:06,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:06,783 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:06,797 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:06,798 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:06,798 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:63, output treesize:16 [2021-05-22 02:30:06,847 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:06,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830310329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:06,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:06,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:06,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876565198] [2021-05-22 02:30:06,848 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:06,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:06,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:06,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:06,848 INFO L87 Difference]: Start difference. First operand 469 states and 1468 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:07,180 INFO L93 Difference]: Finished difference Result 813 states and 2477 transitions. [2021-05-22 02:30:07,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:30:07,180 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:07,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:07,181 INFO L225 Difference]: With dead ends: 813 [2021-05-22 02:30:07,181 INFO L226 Difference]: Without dead ends: 759 [2021-05-22 02:30:07,181 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 266.4ms TimeCoverageRelationStatistics Valid=88, Invalid=418, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:30:07,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 759 states. [2021-05-22 02:30:07,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 759 to 470. [2021-05-22 02:30:07,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1577825159914714) internal successors, (1481), 469 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1481 transitions. [2021-05-22 02:30:07,187 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1481 transitions. Word has length 21 [2021-05-22 02:30:07,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:07,187 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1481 transitions. [2021-05-22 02:30:07,187 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,187 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1481 transitions. [2021-05-22 02:30:07,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:07,188 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:07,188 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:07,392 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3992,731 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:07,392 INFO L430 AbstractCegarLoop]: === Iteration 743 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:07,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:07,392 INFO L82 PathProgramCache]: Analyzing trace with hash -402568883, now seen corresponding path program 731 times [2021-05-22 02:30:07,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:07,393 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184727560] [2021-05-22 02:30:07,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:07,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:07,492 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:07,493 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:07,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184727560] [2021-05-22 02:30:07,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184727560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:07,493 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230517385] [2021-05-22 02:30:07,493 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 732 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 732 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:07,518 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:07,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:07,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:07,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:07,588 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_204], 1=[o_0]} [2021-05-22 02:30:07,591 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:07,592 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:07,606 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:07,608 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:07,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:07,609 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:07,622 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:07,623 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:07,623 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:30:07,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:07,672 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:07,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:07,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:07,675 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:07,690 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:07,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:07,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:07,694 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:07,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:07,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:07,710 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:30:07,750 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:07,750 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230517385] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:07,750 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:07,750 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:07,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886532215] [2021-05-22 02:30:07,750 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:07,750 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:07,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:07,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:07,750 INFO L87 Difference]: Start difference. First operand 470 states and 1481 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:07,950 INFO L93 Difference]: Finished difference Result 613 states and 1898 transitions. [2021-05-22 02:30:07,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:07,950 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:07,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:07,951 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:30:07,951 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:30:07,951 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 173.4ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:07,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:30:07,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 470. [2021-05-22 02:30:07,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1577825159914714) internal successors, (1481), 469 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1481 transitions. [2021-05-22 02:30:07,956 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1481 transitions. Word has length 21 [2021-05-22 02:30:07,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:07,956 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1481 transitions. [2021-05-22 02:30:07,956 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:07,956 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1481 transitions. [2021-05-22 02:30:07,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:07,957 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:07,957 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:08,157 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 732 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4001 [2021-05-22 02:30:08,157 INFO L430 AbstractCegarLoop]: === Iteration 744 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:08,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:08,157 INFO L82 PathProgramCache]: Analyzing trace with hash -105302473, now seen corresponding path program 732 times [2021-05-22 02:30:08,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:08,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938591252] [2021-05-22 02:30:08,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:08,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:08,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:08,269 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:08,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938591252] [2021-05-22 02:30:08,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938591252] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:08,269 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086142585] [2021-05-22 02:30:08,269 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 733 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 733 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:08,294 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:30:08,294 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:08,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:08,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:08,338 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:08,339 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:08,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:08,340 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:08,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:08,343 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:08,354 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:08,355 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:08,355 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:30:08,386 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:30:08,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:08,389 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:08,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:08,392 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:08,407 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:08,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:08,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:08,410 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:08,425 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:08,426 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:08,426 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:19 [2021-05-22 02:30:08,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:08,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1086142585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:08,499 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:08,499 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:08,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089039851] [2021-05-22 02:30:08,499 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:08,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:08,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:08,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:08,499 INFO L87 Difference]: Start difference. First operand 470 states and 1481 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:08,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:08,754 INFO L93 Difference]: Finished difference Result 668 states and 2064 transitions. [2021-05-22 02:30:08,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:08,754 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:08,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:08,755 INFO L225 Difference]: With dead ends: 668 [2021-05-22 02:30:08,755 INFO L226 Difference]: Without dead ends: 645 [2021-05-22 02:30:08,755 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 221.5ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:08,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 645 states. [2021-05-22 02:30:08,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 645 to 470. [2021-05-22 02:30:08,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1577825159914714) internal successors, (1481), 469 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:08,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1481 transitions. [2021-05-22 02:30:08,760 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1481 transitions. Word has length 21 [2021-05-22 02:30:08,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:08,760 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1481 transitions. [2021-05-22 02:30:08,760 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:08,760 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1481 transitions. [2021-05-22 02:30:08,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:08,761 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:08,761 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:08,961 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 733 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4008 [2021-05-22 02:30:08,961 INFO L430 AbstractCegarLoop]: === Iteration 745 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:08,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:08,961 INFO L82 PathProgramCache]: Analyzing trace with hash -1393897095, now seen corresponding path program 733 times [2021-05-22 02:30:08,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:08,961 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [483224903] [2021-05-22 02:30:08,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:08,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:09,074 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:09,074 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:09,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [483224903] [2021-05-22 02:30:09,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [483224903] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:09,075 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791651207] [2021-05-22 02:30:09,075 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 734 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 734 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:09,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:09,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:09,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:09,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:09,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:09,154 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:09,163 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:09,164 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:09,164 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:30:09,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:09,212 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:09,214 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:09,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:09,215 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:09,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:09,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:09,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:09,235 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:09,252 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:09,253 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:09,253 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:30:09,328 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:09,329 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791651207] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:09,329 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:09,329 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:09,329 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579203752] [2021-05-22 02:30:09,329 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:09,329 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:09,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:09,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:09,329 INFO L87 Difference]: Start difference. First operand 470 states and 1481 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:09,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:09,641 INFO L93 Difference]: Finished difference Result 712 states and 2177 transitions. [2021-05-22 02:30:09,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:09,641 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:09,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:09,642 INFO L225 Difference]: With dead ends: 712 [2021-05-22 02:30:09,642 INFO L226 Difference]: Without dead ends: 685 [2021-05-22 02:30:09,642 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 259.7ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:30:09,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2021-05-22 02:30:09,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 465. [2021-05-22 02:30:09,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1357758620689653) internal successors, (1455), 464 states have internal predecessors, (1455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:09,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1455 transitions. [2021-05-22 02:30:09,648 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1455 transitions. Word has length 21 [2021-05-22 02:30:09,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:09,648 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1455 transitions. [2021-05-22 02:30:09,648 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:09,648 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1455 transitions. [2021-05-22 02:30:09,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:09,648 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:09,648 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:09,849 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4016,734 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:09,849 INFO L430 AbstractCegarLoop]: === Iteration 746 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:09,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:09,849 INFO L82 PathProgramCache]: Analyzing trace with hash 993818295, now seen corresponding path program 734 times [2021-05-22 02:30:09,849 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:09,849 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137669913] [2021-05-22 02:30:09,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:09,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:09,949 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:09,949 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:09,949 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137669913] [2021-05-22 02:30:09,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137669913] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:09,950 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [795398656] [2021-05-22 02:30:09,950 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 735 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 735 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:09,976 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:09,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:09,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:09,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:10,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:10,033 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:10,036 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,052 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:10,052 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:10,107 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:10,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:10,108 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,114 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:10,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:10,117 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,122 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,123 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:30:10,136 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:10,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [795398656] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:10,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:10,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:10,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56185536] [2021-05-22 02:30:10,137 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:10,137 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:10,137 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:10,137 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:10,137 INFO L87 Difference]: Start difference. First operand 465 states and 1455 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:10,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:10,329 INFO L93 Difference]: Finished difference Result 585 states and 1804 transitions. [2021-05-22 02:30:10,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:10,329 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:10,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:10,330 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:30:10,330 INFO L226 Difference]: Without dead ends: 563 [2021-05-22 02:30:10,330 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 157.5ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:10,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-05-22 02:30:10,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 467. [2021-05-22 02:30:10,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1373390557939915) internal successors, (1462), 466 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:10,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1462 transitions. [2021-05-22 02:30:10,334 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1462 transitions. Word has length 21 [2021-05-22 02:30:10,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:10,335 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1462 transitions. [2021-05-22 02:30:10,335 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:10,335 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1462 transitions. [2021-05-22 02:30:10,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:10,335 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:10,335 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:10,535 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4028,735 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:10,536 INFO L430 AbstractCegarLoop]: === Iteration 747 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:10,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:10,536 INFO L82 PathProgramCache]: Analyzing trace with hash 1619142413, now seen corresponding path program 735 times [2021-05-22 02:30:10,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:10,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491499225] [2021-05-22 02:30:10,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:10,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:10,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:10,632 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:10,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491499225] [2021-05-22 02:30:10,632 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491499225] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:10,632 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466723569] [2021-05-22 02:30:10,632 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 736 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 736 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:10,657 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:30:10,657 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:10,658 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:10,658 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:10,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:10,699 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,706 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,707 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:10,707 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:30:10,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:10,769 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:10,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:10,770 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:10,773 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,784 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:10,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:10,787 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:10,798 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:10,799 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:10,799 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:30:10,816 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:10,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466723569] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:10,816 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:10,816 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:10,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291364853] [2021-05-22 02:30:10,817 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:10,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:10,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:10,817 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:10,817 INFO L87 Difference]: Start difference. First operand 467 states and 1462 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:11,008 INFO L93 Difference]: Finished difference Result 576 states and 1767 transitions. [2021-05-22 02:30:11,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:11,008 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:11,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:11,009 INFO L225 Difference]: With dead ends: 576 [2021-05-22 02:30:11,009 INFO L226 Difference]: Without dead ends: 549 [2021-05-22 02:30:11,009 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 146.8ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:11,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 549 states. [2021-05-22 02:30:11,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 549 to 467. [2021-05-22 02:30:11,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.128755364806867) internal successors, (1458), 466 states have internal predecessors, (1458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1458 transitions. [2021-05-22 02:30:11,014 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1458 transitions. Word has length 21 [2021-05-22 02:30:11,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:11,014 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1458 transitions. [2021-05-22 02:30:11,014 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,014 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1458 transitions. [2021-05-22 02:30:11,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:11,014 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:11,014 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:11,215 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 736 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4032 [2021-05-22 02:30:11,215 INFO L430 AbstractCegarLoop]: === Iteration 748 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:11,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:11,215 INFO L82 PathProgramCache]: Analyzing trace with hash 1334879729, now seen corresponding path program 736 times [2021-05-22 02:30:11,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:11,215 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820193028] [2021-05-22 02:30:11,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:11,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:11,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:11,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:11,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820193028] [2021-05-22 02:30:11,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820193028] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:11,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796596842] [2021-05-22 02:30:11,304 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 737 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 737 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:11,342 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:11,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:11,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:11,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:11,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:11,393 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:11,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:11,395 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:11,409 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:11,411 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:11,411 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:11,483 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_206, v_prenex_205], 1=[o_0, o_2]} [2021-05-22 02:30:11,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:11,487 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:11,496 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:11,496 INFO L518 ElimStorePlain]: Eliminatee v_prenex_205 vanished before elimination [2021-05-22 02:30:11,498 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:11,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:11,499 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:11,507 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:11,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:11,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:11,510 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:11,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:11,519 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:11,519 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:30:11,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:11,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796596842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:11,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:11,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:11,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681469803] [2021-05-22 02:30:11,549 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:11,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:11,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:11,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:11,549 INFO L87 Difference]: Start difference. First operand 467 states and 1458 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:11,752 INFO L93 Difference]: Finished difference Result 598 states and 1840 transitions. [2021-05-22 02:30:11,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:11,752 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:11,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:11,753 INFO L225 Difference]: With dead ends: 598 [2021-05-22 02:30:11,753 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:30:11,753 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 172.9ms TimeCoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:11,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:30:11,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 465. [2021-05-22 02:30:11,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1314655172413794) internal successors, (1453), 464 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1453 transitions. [2021-05-22 02:30:11,758 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1453 transitions. Word has length 21 [2021-05-22 02:30:11,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:11,758 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1453 transitions. [2021-05-22 02:30:11,758 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:11,758 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1453 transitions. [2021-05-22 02:30:11,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:11,759 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:11,759 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:11,959 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4040,737 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:11,959 INFO L430 AbstractCegarLoop]: === Iteration 749 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:11,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:11,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1251191355, now seen corresponding path program 737 times [2021-05-22 02:30:11,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:11,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822838854] [2021-05-22 02:30:11,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:11,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:12,065 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:12,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:12,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822838854] [2021-05-22 02:30:12,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822838854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:12,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26695106] [2021-05-22 02:30:12,065 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 738 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 738 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:12,091 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:12,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:12,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:12,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:12,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:12,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:12,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,157 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,159 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:12,159 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:12,192 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_207, v_prenex_208]} [2021-05-22 02:30:12,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:12,196 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,208 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,208 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:12,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:12,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:12,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,221 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,223 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:12,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:12,224 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,234 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,235 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:12,235 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:21 [2021-05-22 02:30:12,269 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:12,269 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26695106] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:12,269 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:12,269 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:12,270 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236038166] [2021-05-22 02:30:12,270 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:12,270 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:12,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:12,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:12,270 INFO L87 Difference]: Start difference. First operand 465 states and 1453 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:12,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:12,414 INFO L93 Difference]: Finished difference Result 598 states and 1844 transitions. [2021-05-22 02:30:12,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:12,414 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:12,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:12,415 INFO L225 Difference]: With dead ends: 598 [2021-05-22 02:30:12,415 INFO L226 Difference]: Without dead ends: 569 [2021-05-22 02:30:12,415 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 157.7ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:12,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-22 02:30:12,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 465. [2021-05-22 02:30:12,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1314655172413794) internal successors, (1453), 464 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:12,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1453 transitions. [2021-05-22 02:30:12,419 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1453 transitions. Word has length 21 [2021-05-22 02:30:12,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:12,420 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1453 transitions. [2021-05-22 02:30:12,420 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:12,420 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1453 transitions. [2021-05-22 02:30:12,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:12,420 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:12,420 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:12,620 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 738 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4053 [2021-05-22 02:30:12,621 INFO L430 AbstractCegarLoop]: === Iteration 750 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:12,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:12,621 INFO L82 PathProgramCache]: Analyzing trace with hash -953924945, now seen corresponding path program 738 times [2021-05-22 02:30:12,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:12,621 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968993444] [2021-05-22 02:30:12,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:12,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:12,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:12,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:12,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968993444] [2021-05-22 02:30:12,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968993444] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:12,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489219101] [2021-05-22 02:30:12,710 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 739 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 739 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:12,736 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:30:12,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:12,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:12,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:12,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:12,778 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,787 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:12,787 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:30:12,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:12,821 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:12,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:12,822 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:12,825 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,841 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:12,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:12,843 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:12,858 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:12,859 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:12,859 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:65, output treesize:19 [2021-05-22 02:30:12,902 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:12,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489219101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:12,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:12,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:12,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832318678] [2021-05-22 02:30:12,903 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:12,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:12,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:12,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:12,903 INFO L87 Difference]: Start difference. First operand 465 states and 1453 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:13,119 INFO L93 Difference]: Finished difference Result 563 states and 1730 transitions. [2021-05-22 02:30:13,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:13,119 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:13,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:13,120 INFO L225 Difference]: With dead ends: 563 [2021-05-22 02:30:13,120 INFO L226 Difference]: Without dead ends: 540 [2021-05-22 02:30:13,120 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 157.7ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:13,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-22 02:30:13,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 464. [2021-05-22 02:30:13,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.140388768898488) internal successors, (1454), 463 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1454 transitions. [2021-05-22 02:30:13,125 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1454 transitions. Word has length 21 [2021-05-22 02:30:13,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:13,125 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1454 transitions. [2021-05-22 02:30:13,125 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,125 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1454 transitions. [2021-05-22 02:30:13,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:13,126 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:13,126 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:13,326 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4059,739 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:13,326 INFO L430 AbstractCegarLoop]: === Iteration 751 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:13,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:13,326 INFO L82 PathProgramCache]: Analyzing trace with hash -1238187629, now seen corresponding path program 739 times [2021-05-22 02:30:13,326 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:13,326 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114269356] [2021-05-22 02:30:13,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:13,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:13,435 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:13,435 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:13,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114269356] [2021-05-22 02:30:13,435 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1114269356] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:13,435 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027924201] [2021-05-22 02:30:13,435 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 740 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 740 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:13,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:13,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:13,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:13,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:13,518 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:13,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:13,520 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:13,535 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:13,536 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:13,536 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:13,572 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_209, v_prenex_210], 1=[o_0, o_2]} [2021-05-22 02:30:13,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:13,576 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:13,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:13,588 INFO L518 ElimStorePlain]: Eliminatee v_prenex_210 vanished before elimination [2021-05-22 02:30:13,590 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:13,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:13,591 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:13,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:13,603 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:13,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:13,604 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:13,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:13,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:13,615 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:30:13,691 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:13,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027924201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:13,692 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:13,692 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:13,692 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838604185] [2021-05-22 02:30:13,692 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:13,692 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:13,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:13,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:13,692 INFO L87 Difference]: Start difference. First operand 464 states and 1454 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:13,918 INFO L93 Difference]: Finished difference Result 679 states and 2087 transitions. [2021-05-22 02:30:13,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:13,919 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:13,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:13,920 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:30:13,920 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:30:13,920 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 236.0ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:13,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:30:13,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 461. [2021-05-22 02:30:13,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.128260869565217) internal successors, (1439), 460 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1439 transitions. [2021-05-22 02:30:13,925 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1439 transitions. Word has length 21 [2021-05-22 02:30:13,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:13,925 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1439 transitions. [2021-05-22 02:30:13,925 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:13,925 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1439 transitions. [2021-05-22 02:30:13,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:13,926 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:13,926 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:14,126 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 740 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4066 [2021-05-22 02:30:14,126 INFO L430 AbstractCegarLoop]: === Iteration 752 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:14,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:14,126 INFO L82 PathProgramCache]: Analyzing trace with hash -488191473, now seen corresponding path program 740 times [2021-05-22 02:30:14,127 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:14,127 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [880757459] [2021-05-22 02:30:14,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:14,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:14,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:14,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:14,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [880757459] [2021-05-22 02:30:14,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [880757459] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:14,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770959647] [2021-05-22 02:30:14,221 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 741 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 741 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:14,248 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:14,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:14,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:14,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:14,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,311 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:14,312 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:14,314 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:14,315 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:14,328 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:14,329 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:14,330 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:14,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:14,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:14,428 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:14,430 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:14,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:14,437 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:14,439 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:14,439 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:30:14,447 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:14,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770959647] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:14,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:14,447 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:14,447 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [145658962] [2021-05-22 02:30:14,447 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:14,447 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:14,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:14,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:14,448 INFO L87 Difference]: Start difference. First operand 461 states and 1439 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:14,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:14,612 INFO L93 Difference]: Finished difference Result 554 states and 1707 transitions. [2021-05-22 02:30:14,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:14,612 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:14,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:14,613 INFO L225 Difference]: With dead ends: 554 [2021-05-22 02:30:14,613 INFO L226 Difference]: Without dead ends: 532 [2021-05-22 02:30:14,613 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 159.5ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:14,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-22 02:30:14,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 471. [2021-05-22 02:30:14,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1382978723404253) internal successors, (1475), 470 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:14,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1475 transitions. [2021-05-22 02:30:14,618 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1475 transitions. Word has length 21 [2021-05-22 02:30:14,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:14,618 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1475 transitions. [2021-05-22 02:30:14,618 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:14,618 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1475 transitions. [2021-05-22 02:30:14,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:14,619 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:14,619 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:14,819 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 741 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4079 [2021-05-22 02:30:14,819 INFO L430 AbstractCegarLoop]: === Iteration 753 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:14,819 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:14,820 INFO L82 PathProgramCache]: Analyzing trace with hash -989982809, now seen corresponding path program 741 times [2021-05-22 02:30:14,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:14,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [204885999] [2021-05-22 02:30:14,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:14,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:14,903 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:14,903 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:14,903 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [204885999] [2021-05-22 02:30:14,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [204885999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:14,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1733839887] [2021-05-22 02:30:14,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 742 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 742 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:14,935 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:14,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:14,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:14,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:14,998 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,999 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:14,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:15,002 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:15,005 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,020 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:15,020 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:15,082 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:15,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:15,083 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,091 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,093 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:15,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:15,094 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,102 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,103 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,103 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:12 [2021-05-22 02:30:15,116 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:15,116 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1733839887] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:15,116 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:15,116 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:15,116 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688361004] [2021-05-22 02:30:15,116 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:15,116 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:15,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:15,116 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:15,117 INFO L87 Difference]: Start difference. First operand 471 states and 1475 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:15,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:15,265 INFO L93 Difference]: Finished difference Result 563 states and 1731 transitions. [2021-05-22 02:30:15,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:15,266 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:15,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:15,266 INFO L225 Difference]: With dead ends: 563 [2021-05-22 02:30:15,267 INFO L226 Difference]: Without dead ends: 541 [2021-05-22 02:30:15,267 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 144.4ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:15,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-22 02:30:15,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 468. [2021-05-22 02:30:15,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.132762312633833) internal successors, (1463), 467 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:15,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1463 transitions. [2021-05-22 02:30:15,271 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1463 transitions. Word has length 21 [2021-05-22 02:30:15,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:15,271 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1463 transitions. [2021-05-22 02:30:15,271 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:15,272 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1463 transitions. [2021-05-22 02:30:15,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:15,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:15,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:15,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 742 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4086 [2021-05-22 02:30:15,473 INFO L430 AbstractCegarLoop]: === Iteration 754 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:15,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:15,473 INFO L82 PathProgramCache]: Analyzing trace with hash 137132645, now seen corresponding path program 742 times [2021-05-22 02:30:15,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:15,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99907499] [2021-05-22 02:30:15,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:15,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:15,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:15,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:15,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99907499] [2021-05-22 02:30:15,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99907499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:15,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [593718396] [2021-05-22 02:30:15,573 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 743 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 743 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:15,598 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:15,599 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:15,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:15,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:15,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:15,652 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,654 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:15,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:15,655 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,672 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,674 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:15,674 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:30:15,783 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:15,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:15,784 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,793 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:15,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:15,794 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:15,802 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:15,802 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:30:15,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:15,829 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [593718396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:15,829 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:15,829 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:15,829 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1987938665] [2021-05-22 02:30:15,829 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:15,829 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:15,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:15,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:15,829 INFO L87 Difference]: Start difference. First operand 468 states and 1463 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:16,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:16,012 INFO L93 Difference]: Finished difference Result 648 states and 1999 transitions. [2021-05-22 02:30:16,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:16,012 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:16,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:16,013 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:30:16,013 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:30:16,013 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 236.6ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:16,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:30:16,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 474. [2021-05-22 02:30:16,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.141649048625793) internal successors, (1486), 473 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:16,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1486 transitions. [2021-05-22 02:30:16,018 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1486 transitions. Word has length 21 [2021-05-22 02:30:16,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:16,018 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1486 transitions. [2021-05-22 02:30:16,018 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:16,018 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1486 transitions. [2021-05-22 02:30:16,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:16,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:16,019 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:16,219 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4093,743 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:16,219 INFO L430 AbstractCegarLoop]: === Iteration 755 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:16,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:16,220 INFO L82 PathProgramCache]: Analyzing trace with hash -85075967, now seen corresponding path program 743 times [2021-05-22 02:30:16,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:16,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897069137] [2021-05-22 02:30:16,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:16,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:16,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:16,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:16,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897069137] [2021-05-22 02:30:16,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897069137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:16,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569799832] [2021-05-22 02:30:16,310 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 744 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 744 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:16,341 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:16,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:16,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:30:16,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:16,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:16,388 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:16,391 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,419 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:16,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:16,421 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:89, output treesize:75 [2021-05-22 02:30:16,628 INFO L446 ElimStorePlain]: Different costs {1=[o_2], 3=[o_4]} [2021-05-22 02:30:16,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:16,632 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,634 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,635 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:30:16,636 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,639 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:16,640 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:30:16,643 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:16,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,674 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:30:16,675 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:16,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:16,678 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:16,705 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:16,707 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:30:16,707 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:125, output treesize:21 [2021-05-22 02:30:16,748 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:16,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569799832] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:16,748 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:16,748 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:16,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [373502636] [2021-05-22 02:30:16,748 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:16,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:16,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:16,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:16,749 INFO L87 Difference]: Start difference. First operand 474 states and 1486 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:17,071 INFO L93 Difference]: Finished difference Result 759 states and 2318 transitions. [2021-05-22 02:30:17,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:30:17,071 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:17,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:17,072 INFO L225 Difference]: With dead ends: 759 [2021-05-22 02:30:17,072 INFO L226 Difference]: Without dead ends: 699 [2021-05-22 02:30:17,072 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 351.0ms TimeCoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:30:17,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2021-05-22 02:30:17,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 474. [2021-05-22 02:30:17,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.13107822410148) internal successors, (1481), 473 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1481 transitions. [2021-05-22 02:30:17,077 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1481 transitions. Word has length 21 [2021-05-22 02:30:17,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:17,078 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1481 transitions. [2021-05-22 02:30:17,078 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,078 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1481 transitions. [2021-05-22 02:30:17,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:17,078 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:17,078 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:17,278 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 744 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4100 [2021-05-22 02:30:17,279 INFO L430 AbstractCegarLoop]: === Iteration 756 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:17,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:17,279 INFO L82 PathProgramCache]: Analyzing trace with hash 1823524485, now seen corresponding path program 744 times [2021-05-22 02:30:17,279 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:17,279 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988682462] [2021-05-22 02:30:17,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:17,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:17,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:17,379 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:17,379 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988682462] [2021-05-22 02:30:17,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988682462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:17,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [472802445] [2021-05-22 02:30:17,380 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 745 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 745 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:17,405 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:17,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:17,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:17,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:17,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:17,460 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:17,462 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:17,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:17,463 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:17,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:17,482 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:17,482 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:30:17,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:17,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:17,580 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:17,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:17,581 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:17,595 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:17,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:17,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:17,598 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:17,612 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:17,613 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:17,613 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:30:17,660 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:17,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [472802445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:17,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:17,660 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:17,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087014375] [2021-05-22 02:30:17,661 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:17,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:17,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:17,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:17,661 INFO L87 Difference]: Start difference. First operand 474 states and 1481 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:17,907 INFO L93 Difference]: Finished difference Result 671 states and 2081 transitions. [2021-05-22 02:30:17,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:17,907 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:17,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:17,908 INFO L225 Difference]: With dead ends: 671 [2021-05-22 02:30:17,908 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 02:30:17,908 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 214.5ms TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:17,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 02:30:17,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 472. [2021-05-22 02:30:17,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1337579617834397) internal successors, (1476), 471 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1476 transitions. [2021-05-22 02:30:17,913 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1476 transitions. Word has length 21 [2021-05-22 02:30:17,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:17,913 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1476 transitions. [2021-05-22 02:30:17,913 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:17,913 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1476 transitions. [2021-05-22 02:30:17,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:17,914 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:17,914 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:18,114 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 745 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4116 [2021-05-22 02:30:18,114 INFO L430 AbstractCegarLoop]: === Iteration 757 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:18,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:18,115 INFO L82 PathProgramCache]: Analyzing trace with hash -174603897, now seen corresponding path program 745 times [2021-05-22 02:30:18,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:18,115 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713322511] [2021-05-22 02:30:18,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:18,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:18,215 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:18,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713322511] [2021-05-22 02:30:18,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713322511] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:18,215 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1747249455] [2021-05-22 02:30:18,215 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 746 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 746 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:18,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:18,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:18,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:18,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:18,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:18,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:18,295 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:18,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:18,298 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:18,315 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:18,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:18,317 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:30:18,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:18,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:18,389 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:18,397 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:18,399 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:18,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:18,400 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:18,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:18,408 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:18,409 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:30:18,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:18,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1747249455] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:18,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:18,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:18,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460637669] [2021-05-22 02:30:18,452 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:18,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:18,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:18,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:18,452 INFO L87 Difference]: Start difference. First operand 472 states and 1476 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:18,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:18,630 INFO L93 Difference]: Finished difference Result 640 states and 1974 transitions. [2021-05-22 02:30:18,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:18,630 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:18,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:18,631 INFO L225 Difference]: With dead ends: 640 [2021-05-22 02:30:18,631 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:30:18,631 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 201.0ms TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:18,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:30:18,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 468. [2021-05-22 02:30:18,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.126338329764454) internal successors, (1460), 467 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:18,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1460 transitions. [2021-05-22 02:30:18,636 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1460 transitions. Word has length 21 [2021-05-22 02:30:18,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:18,636 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1460 transitions. [2021-05-22 02:30:18,636 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:18,636 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1460 transitions. [2021-05-22 02:30:18,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:18,637 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:18,637 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:18,837 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 746 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4130 [2021-05-22 02:30:18,837 INFO L430 AbstractCegarLoop]: === Iteration 758 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:18,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:18,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1903565785, now seen corresponding path program 746 times [2021-05-22 02:30:18,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:18,838 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [601017956] [2021-05-22 02:30:18,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:18,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:18,925 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:18,926 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:18,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [601017956] [2021-05-22 02:30:18,926 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [601017956] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:18,926 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946517748] [2021-05-22 02:30:18,926 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 747 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 747 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:18,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:18,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:18,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:18,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:19,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:19,019 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:19,022 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:19,036 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:19,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:19,121 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,123 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:19,124 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,138 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:19,141 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:19,156 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:30:19,181 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:19,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946517748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:19,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:19,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:19,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860421495] [2021-05-22 02:30:19,182 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:19,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:19,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:19,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:19,182 INFO L87 Difference]: Start difference. First operand 468 states and 1460 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:19,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:19,335 INFO L93 Difference]: Finished difference Result 599 states and 1846 transitions. [2021-05-22 02:30:19,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:19,336 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:19,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:19,337 INFO L225 Difference]: With dead ends: 599 [2021-05-22 02:30:19,337 INFO L226 Difference]: Without dead ends: 570 [2021-05-22 02:30:19,337 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 162.9ms TimeCoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:19,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-05-22 02:30:19,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 468. [2021-05-22 02:30:19,341 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.126338329764454) internal successors, (1460), 467 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:19,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1460 transitions. [2021-05-22 02:30:19,341 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1460 transitions. Word has length 21 [2021-05-22 02:30:19,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:19,342 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1460 transitions. [2021-05-22 02:30:19,342 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:19,342 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1460 transitions. [2021-05-22 02:30:19,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:19,342 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:19,342 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:19,542 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 747 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4134 [2021-05-22 02:30:19,543 INFO L430 AbstractCegarLoop]: === Iteration 759 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:19,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:19,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1296702593, now seen corresponding path program 747 times [2021-05-22 02:30:19,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:19,543 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012317821] [2021-05-22 02:30:19,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:19,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:19,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:19,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:19,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012317821] [2021-05-22 02:30:19,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012317821] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:19,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659799702] [2021-05-22 02:30:19,626 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 748 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 748 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:19,653 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:30:19,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:19,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:19,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:19,699 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:19,700 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,708 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:19,710 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:30:19,787 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:19,789 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,791 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:19,792 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,806 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:19,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:19,809 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:19,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:19,824 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:19,824 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:30:19,842 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:19,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [659799702] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:19,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:19,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:19,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [39558479] [2021-05-22 02:30:19,842 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:19,842 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:19,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:19,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:19,842 INFO L87 Difference]: Start difference. First operand 468 states and 1460 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:20,025 INFO L93 Difference]: Finished difference Result 562 states and 1729 transitions. [2021-05-22 02:30:20,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:20,025 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:20,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:20,026 INFO L225 Difference]: With dead ends: 562 [2021-05-22 02:30:20,026 INFO L226 Difference]: Without dead ends: 535 [2021-05-22 02:30:20,026 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 149.2ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:20,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-22 02:30:20,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 465. [2021-05-22 02:30:20,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1293103448275863) internal successors, (1452), 464 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1452 transitions. [2021-05-22 02:30:20,031 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1452 transitions. Word has length 21 [2021-05-22 02:30:20,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:20,031 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1452 transitions. [2021-05-22 02:30:20,031 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,031 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1452 transitions. [2021-05-22 02:30:20,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:20,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:20,032 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:20,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4148,748 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:20,232 INFO L430 AbstractCegarLoop]: === Iteration 760 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:20,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:20,232 INFO L82 PathProgramCache]: Analyzing trace with hash 672416829, now seen corresponding path program 748 times [2021-05-22 02:30:20,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:20,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1392688629] [2021-05-22 02:30:20,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:20,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:20,319 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:20,319 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:20,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1392688629] [2021-05-22 02:30:20,319 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1392688629] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:20,319 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [114841173] [2021-05-22 02:30:20,319 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 749 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 749 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:20,350 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:20,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:20,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:20,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:20,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:20,413 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:20,415 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:20,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:20,416 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:20,430 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:20,431 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:20,431 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:20,473 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:20,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:20,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:20,475 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:20,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:20,478 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:20,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:20,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:20,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:20,498 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:20,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:20,515 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:20,515 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:30:20,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:20,550 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [114841173] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:20,550 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:20,550 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:20,550 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2008215361] [2021-05-22 02:30:20,550 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:20,550 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:20,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:20,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:20,550 INFO L87 Difference]: Start difference. First operand 465 states and 1452 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:20,705 INFO L93 Difference]: Finished difference Result 602 states and 1854 transitions. [2021-05-22 02:30:20,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:20,705 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:20,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:20,706 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:30:20,706 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:30:20,706 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 145.1ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:20,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:30:20,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 465. [2021-05-22 02:30:20,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1293103448275863) internal successors, (1452), 464 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1452 transitions. [2021-05-22 02:30:20,711 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1452 transitions. Word has length 21 [2021-05-22 02:30:20,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:20,711 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1452 transitions. [2021-05-22 02:30:20,711 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:20,711 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1452 transitions. [2021-05-22 02:30:20,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:20,712 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:20,712 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:20,912 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 749 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4155 [2021-05-22 02:30:20,912 INFO L430 AbstractCegarLoop]: === Iteration 761 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:20,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:20,912 INFO L82 PathProgramCache]: Analyzing trace with hash 969683239, now seen corresponding path program 749 times [2021-05-22 02:30:20,913 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:20,913 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538779773] [2021-05-22 02:30:20,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:20,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:21,016 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:21,016 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:21,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538779773] [2021-05-22 02:30:21,016 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1538779773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:21,016 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370381974] [2021-05-22 02:30:21,017 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 750 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 750 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:21,043 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:21,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:21,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:30:21,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:21,096 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,097 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:21,098 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:21,101 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:21,104 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,107 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:21,108 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:21,152 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 4 xjuncts. [2021-05-22 02:30:21,152 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:145, output treesize:97 [2021-05-22 02:30:21,235 INFO L446 ElimStorePlain]: Different costs {1=[o_2], 3=[o_4]} [2021-05-22 02:30:21,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,239 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:21,240 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,243 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:21,243 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,246 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,247 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:21,248 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:21,251 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,295 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:21,298 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,298 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:21,299 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,301 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:21,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:21,302 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:21,345 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:21,346 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:30:21,346 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:153, output treesize:57 [2021-05-22 02:30:21,462 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:21,462 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370381974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:21,463 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:21,463 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:21,463 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246788723] [2021-05-22 02:30:21,463 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:21,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:21,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:21,463 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:21,463 INFO L87 Difference]: Start difference. First operand 465 states and 1452 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:21,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:21,984 INFO L93 Difference]: Finished difference Result 745 states and 2288 transitions. [2021-05-22 02:30:21,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:30:21,984 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:21,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:21,985 INFO L225 Difference]: With dead ends: 745 [2021-05-22 02:30:21,985 INFO L226 Difference]: Without dead ends: 703 [2021-05-22 02:30:21,985 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 485.9ms TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:30:21,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-22 02:30:21,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 466. [2021-05-22 02:30:21,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1354838709677417) internal successors, (1458), 465 states have internal predecessors, (1458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:21,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1458 transitions. [2021-05-22 02:30:21,991 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1458 transitions. Word has length 21 [2021-05-22 02:30:21,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:21,991 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1458 transitions. [2021-05-22 02:30:21,991 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:21,991 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1458 transitions. [2021-05-22 02:30:21,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:21,991 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:21,991 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:22,192 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 750 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4164 [2021-05-22 02:30:22,192 INFO L430 AbstractCegarLoop]: === Iteration 762 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:22,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:22,192 INFO L82 PathProgramCache]: Analyzing trace with hash 685420555, now seen corresponding path program 750 times [2021-05-22 02:30:22,192 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:22,192 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893428084] [2021-05-22 02:30:22,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:22,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:22,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:22,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:22,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893428084] [2021-05-22 02:30:22,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893428084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:22,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [699878736] [2021-05-22 02:30:22,288 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 751 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 751 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:22,314 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:22,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:22,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:22,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:22,358 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:22,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:22,359 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:22,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:22,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:22,368 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:30:22,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:22,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:22,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:22,418 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:22,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:22,421 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:22,438 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:22,440 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:22,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:22,441 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:22,457 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:22,458 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:22,458 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:30:22,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:22,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [699878736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:22,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:22,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:22,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313553671] [2021-05-22 02:30:22,534 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:22,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:22,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:22,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:22,534 INFO L87 Difference]: Start difference. First operand 466 states and 1458 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:22,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:22,718 INFO L93 Difference]: Finished difference Result 652 states and 1999 transitions. [2021-05-22 02:30:22,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:22,719 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:22,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:22,720 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:30:22,720 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:30:22,720 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 213.9ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:22,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:30:22,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 464. [2021-05-22 02:30:22,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.125269978401728) internal successors, (1447), 463 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:22,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1447 transitions. [2021-05-22 02:30:22,725 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1447 transitions. Word has length 21 [2021-05-22 02:30:22,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:22,725 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1447 transitions. [2021-05-22 02:30:22,725 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:22,725 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1447 transitions. [2021-05-22 02:30:22,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:22,725 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:22,725 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:22,926 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 751 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4173 [2021-05-22 02:30:22,926 INFO L430 AbstractCegarLoop]: === Iteration 763 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:22,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:22,926 INFO L82 PathProgramCache]: Analyzing trace with hash 2140903215, now seen corresponding path program 751 times [2021-05-22 02:30:22,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:22,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553115270] [2021-05-22 02:30:22,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:22,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:23,025 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:23,026 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:23,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553115270] [2021-05-22 02:30:23,026 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553115270] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:23,026 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052521102] [2021-05-22 02:30:23,026 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 752 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 752 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:23,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:23,052 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:23,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:23,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,118 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:23,119 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:23,127 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:30:23,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:23,155 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,164 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,166 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:23,167 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,176 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,176 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:30:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:23,188 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052521102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:23,188 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:23,188 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:23,188 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765994101] [2021-05-22 02:30:23,188 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:23,188 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:23,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:23,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:23,188 INFO L87 Difference]: Start difference. First operand 464 states and 1447 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:23,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:23,306 INFO L93 Difference]: Finished difference Result 543 states and 1673 transitions. [2021-05-22 02:30:23,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:23,306 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:23,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:23,307 INFO L225 Difference]: With dead ends: 543 [2021-05-22 02:30:23,307 INFO L226 Difference]: Without dead ends: 524 [2021-05-22 02:30:23,307 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 148.7ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:23,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 524 states. [2021-05-22 02:30:23,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 524 to 460. [2021-05-22 02:30:23,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1263616557734206) internal successors, (1435), 459 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:23,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1435 transitions. [2021-05-22 02:30:23,312 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1435 transitions. Word has length 21 [2021-05-22 02:30:23,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:23,312 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1435 transitions. [2021-05-22 02:30:23,312 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:23,312 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1435 transitions. [2021-05-22 02:30:23,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:23,312 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:23,312 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:23,512 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 752 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4185 [2021-05-22 02:30:23,513 INFO L430 AbstractCegarLoop]: === Iteration 764 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:23,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:23,513 INFO L82 PathProgramCache]: Analyzing trace with hash 82692239, now seen corresponding path program 752 times [2021-05-22 02:30:23,513 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:23,513 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1143749192] [2021-05-22 02:30:23,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:23,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:23,617 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:23,617 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:23,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1143749192] [2021-05-22 02:30:23,617 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1143749192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:23,617 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941334130] [2021-05-22 02:30:23,617 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 753 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 753 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:23,655 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:23,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:23,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:23,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:23,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:23,734 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,742 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:23,743 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:30:23,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:30:23,790 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:30:23,794 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:23,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:23,817 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:23,833 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:23,835 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:23,835 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:30:23,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:23,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1941334130] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:23,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:23,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:23,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366484644] [2021-05-22 02:30:23,857 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:23,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:23,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:23,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:23,858 INFO L87 Difference]: Start difference. First operand 460 states and 1435 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:24,010 INFO L93 Difference]: Finished difference Result 564 states and 1735 transitions. [2021-05-22 02:30:24,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:24,010 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:24,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:24,011 INFO L225 Difference]: With dead ends: 564 [2021-05-22 02:30:24,011 INFO L226 Difference]: Without dead ends: 528 [2021-05-22 02:30:24,011 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 153.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:24,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-05-22 02:30:24,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 460. [2021-05-22 02:30:24,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1263616557734206) internal successors, (1435), 459 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1435 transitions. [2021-05-22 02:30:24,016 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1435 transitions. Word has length 21 [2021-05-22 02:30:24,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:24,016 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1435 transitions. [2021-05-22 02:30:24,016 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,016 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1435 transitions. [2021-05-22 02:30:24,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:24,016 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:24,016 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:24,217 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4187,753 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:24,217 INFO L430 AbstractCegarLoop]: === Iteration 765 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:24,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:24,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1012006679, now seen corresponding path program 753 times [2021-05-22 02:30:24,217 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:24,217 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960312242] [2021-05-22 02:30:24,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:24,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:24,301 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:24,301 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:24,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960312242] [2021-05-22 02:30:24,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960312242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:24,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369166895] [2021-05-22 02:30:24,301 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 754 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 754 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:24,328 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:24,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:24,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:24,329 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:24,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:24,407 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:24,408 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:24,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:24,409 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:24,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:24,421 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:24,421 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:24,466 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:24,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:24,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:24,467 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:24,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:24,470 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:24,485 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:24,486 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:24,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:24,487 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:24,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:24,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:24,502 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:30:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:24,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369166895] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:24,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:24,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:24,531 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468116493] [2021-05-22 02:30:24,531 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:24,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:24,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:24,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:24,531 INFO L87 Difference]: Start difference. First operand 460 states and 1435 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:24,768 INFO L93 Difference]: Finished difference Result 605 states and 1854 transitions. [2021-05-22 02:30:24,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:24,768 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:24,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:24,769 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:30:24,769 INFO L226 Difference]: Without dead ends: 578 [2021-05-22 02:30:24,769 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 175.8ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:24,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-05-22 02:30:24,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 475. [2021-05-22 02:30:24,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1244725738396624) internal successors, (1481), 474 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1481 transitions. [2021-05-22 02:30:24,774 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1481 transitions. Word has length 21 [2021-05-22 02:30:24,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:24,774 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1481 transitions. [2021-05-22 02:30:24,774 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:24,774 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1481 transitions. [2021-05-22 02:30:24,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:24,775 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:24,775 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:24,975 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 754 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4193 [2021-05-22 02:30:24,975 INFO L430 AbstractCegarLoop]: === Iteration 766 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:24,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:24,975 INFO L82 PathProgramCache]: Analyzing trace with hash 868746259, now seen corresponding path program 754 times [2021-05-22 02:30:24,975 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:24,976 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927060439] [2021-05-22 02:30:24,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:24,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:25,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:25,062 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:25,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927060439] [2021-05-22 02:30:25,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927060439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:25,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830685695] [2021-05-22 02:30:25,062 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 755 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 755 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:25,088 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:25,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:25,088 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:25,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:25,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:25,167 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,169 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:25,170 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,181 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,182 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:25,182 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:25,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:25,235 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,242 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,244 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:25,245 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,252 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,252 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:30:25,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:25,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830685695] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:25,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:25,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:25,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947205452] [2021-05-22 02:30:25,263 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:25,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:25,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:25,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:25,263 INFO L87 Difference]: Start difference. First operand 475 states and 1481 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:25,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:25,398 INFO L93 Difference]: Finished difference Result 555 states and 1701 transitions. [2021-05-22 02:30:25,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:25,399 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:25,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:25,400 INFO L225 Difference]: With dead ends: 555 [2021-05-22 02:30:25,400 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:30:25,400 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 155.5ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:25,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:30:25,403 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 457. [2021-05-22 02:30:25,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.129385964912281) internal successors, (1427), 456 states have internal predecessors, (1427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:25,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1427 transitions. [2021-05-22 02:30:25,404 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1427 transitions. Word has length 21 [2021-05-22 02:30:25,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:25,404 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1427 transitions. [2021-05-22 02:30:25,404 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:25,404 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1427 transitions. [2021-05-22 02:30:25,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:25,405 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:25,405 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:25,605 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4204,755 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:25,605 INFO L430 AbstractCegarLoop]: === Iteration 767 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:25,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:25,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1521039301, now seen corresponding path program 755 times [2021-05-22 02:30:25,606 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:25,606 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1697373657] [2021-05-22 02:30:25,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:25,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:25,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:25,686 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:25,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1697373657] [2021-05-22 02:30:25,686 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1697373657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:25,686 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543293812] [2021-05-22 02:30:25,686 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 756 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 756 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:25,711 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:25,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:25,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:25,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:25,756 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:25,757 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,767 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:25,767 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:30:25,813 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,814 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:30:25,815 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:30:25,818 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,836 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:25,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:25,840 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:25,857 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:25,858 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:25,858 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:30:25,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:25,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543293812] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:25,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:25,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:25,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [309827283] [2021-05-22 02:30:25,898 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:25,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:25,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:25,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:25,898 INFO L87 Difference]: Start difference. First operand 457 states and 1427 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:26,062 INFO L93 Difference]: Finished difference Result 579 states and 1775 transitions. [2021-05-22 02:30:26,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:26,062 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:26,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:26,063 INFO L225 Difference]: With dead ends: 579 [2021-05-22 02:30:26,063 INFO L226 Difference]: Without dead ends: 543 [2021-05-22 02:30:26,063 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 137.2ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:26,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-22 02:30:26,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 458. [2021-05-22 02:30:26,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1334792122538295) internal successors, (1432), 457 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1432 transitions. [2021-05-22 02:30:26,068 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1432 transitions. Word has length 21 [2021-05-22 02:30:26,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:26,068 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1432 transitions. [2021-05-22 02:30:26,068 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,068 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1432 transitions. [2021-05-22 02:30:26,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:26,068 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:26,068 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:26,269 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 756 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4210 [2021-05-22 02:30:26,269 INFO L430 AbstractCegarLoop]: === Iteration 768 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:26,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:26,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1818305711, now seen corresponding path program 756 times [2021-05-22 02:30:26,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:26,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089826319] [2021-05-22 02:30:26,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:26,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:26,357 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:26,357 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:26,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089826319] [2021-05-22 02:30:26,357 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089826319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:26,357 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1482399894] [2021-05-22 02:30:26,357 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 757 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 757 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:26,384 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:26,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:26,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:26,385 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:26,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:26,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:26,439 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:26,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:26,440 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:26,458 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:26,459 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:26,459 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:30:26,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:26,503 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:26,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:26,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:26,506 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:26,522 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:26,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:26,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:26,525 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:26,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:26,542 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:26,542 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:30:26,565 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:26,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1482399894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:26,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:26,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:30:26,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707439942] [2021-05-22 02:30:26,565 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:30:26,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:26,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:30:26,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:26,566 INFO L87 Difference]: Start difference. First operand 458 states and 1432 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:26,764 INFO L93 Difference]: Finished difference Result 664 states and 2027 transitions. [2021-05-22 02:30:26,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:26,764 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:26,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:26,765 INFO L225 Difference]: With dead ends: 664 [2021-05-22 02:30:26,765 INFO L226 Difference]: Without dead ends: 641 [2021-05-22 02:30:26,765 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 143.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:26,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-22 02:30:26,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 473. [2021-05-22 02:30:26,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1504237288135593) internal successors, (1487), 472 states have internal predecessors, (1487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1487 transitions. [2021-05-22 02:30:26,770 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1487 transitions. Word has length 21 [2021-05-22 02:30:26,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:26,770 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1487 transitions. [2021-05-22 02:30:26,770 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:26,770 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1487 transitions. [2021-05-22 02:30:26,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:26,770 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:26,770 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:26,971 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 757 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4216 [2021-05-22 02:30:26,971 INFO L430 AbstractCegarLoop]: === Iteration 769 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:26,971 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:26,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1534043027, now seen corresponding path program 757 times [2021-05-22 02:30:26,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:26,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [745274453] [2021-05-22 02:30:26,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:26,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:27,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:27,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:27,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [745274453] [2021-05-22 02:30:27,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [745274453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:27,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1830028326] [2021-05-22 02:30:27,066 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 758 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 758 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:27,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:27,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:27,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:27,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:27,152 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:27,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:27,155 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:27,169 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:27,169 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:27,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:27,212 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,214 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:27,214 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:27,215 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:27,235 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:27,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:27,235 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,252 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:27,253 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:27,253 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:30:27,336 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:27,336 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1830028326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:27,336 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:27,336 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:27,336 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939685865] [2021-05-22 02:30:27,337 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:27,337 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:27,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:27,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:27,337 INFO L87 Difference]: Start difference. First operand 473 states and 1487 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:27,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:27,585 INFO L93 Difference]: Finished difference Result 730 states and 2226 transitions. [2021-05-22 02:30:27,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:27,585 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:27,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:27,586 INFO L225 Difference]: With dead ends: 730 [2021-05-22 02:30:27,586 INFO L226 Difference]: Without dead ends: 703 [2021-05-22 02:30:27,586 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 249.7ms TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:30:27,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-22 02:30:27,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 491. [2021-05-22 02:30:27,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.157142857142857) internal successors, (1547), 490 states have internal predecessors, (1547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:27,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1547 transitions. [2021-05-22 02:30:27,592 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1547 transitions. Word has length 21 [2021-05-22 02:30:27,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:27,592 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1547 transitions. [2021-05-22 02:30:27,592 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:27,592 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1547 transitions. [2021-05-22 02:30:27,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:27,593 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:27,593 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:27,793 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4223,758 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:27,793 INFO L430 AbstractCegarLoop]: === Iteration 770 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:27,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:27,793 INFO L82 PathProgramCache]: Analyzing trace with hash -426703939, now seen corresponding path program 758 times [2021-05-22 02:30:27,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:27,793 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21486149] [2021-05-22 02:30:27,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:27,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:27,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:27,892 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:27,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21486149] [2021-05-22 02:30:27,892 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21486149] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:27,892 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [910040498] [2021-05-22 02:30:27,892 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 759 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 759 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:27,918 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:27,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:27,919 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:27,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:27,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:27,971 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:27,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:27,974 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:27,991 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:27,992 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:27,992 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:30:28,047 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:28,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,056 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:28,058 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:28,059 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,067 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:28,067 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,068 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:30:28,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:28,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [910040498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:28,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:28,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:28,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244712500] [2021-05-22 02:30:28,113 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:28,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:28,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:28,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:28,113 INFO L87 Difference]: Start difference. First operand 491 states and 1547 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:28,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:28,303 INFO L93 Difference]: Finished difference Result 670 states and 2062 transitions. [2021-05-22 02:30:28,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:28,303 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:28,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:28,304 INFO L225 Difference]: With dead ends: 670 [2021-05-22 02:30:28,304 INFO L226 Difference]: Without dead ends: 651 [2021-05-22 02:30:28,304 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 202.2ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:28,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-05-22 02:30:28,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 477. [2021-05-22 02:30:28,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1470588235294117) internal successors, (1498), 476 states have internal predecessors, (1498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:28,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1498 transitions. [2021-05-22 02:30:28,309 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1498 transitions. Word has length 21 [2021-05-22 02:30:28,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:28,309 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1498 transitions. [2021-05-22 02:30:28,309 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:28,310 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1498 transitions. [2021-05-22 02:30:28,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:28,310 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:28,310 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:28,510 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 759 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4237 [2021-05-22 02:30:28,511 INFO L430 AbstractCegarLoop]: === Iteration 771 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:28,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:28,511 INFO L82 PathProgramCache]: Analyzing trace with hash 118668715, now seen corresponding path program 759 times [2021-05-22 02:30:28,511 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:28,511 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733082422] [2021-05-22 02:30:28,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:28,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:28,596 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:28,596 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:28,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733082422] [2021-05-22 02:30:28,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733082422] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:28,596 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [972863445] [2021-05-22 02:30:28,596 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 760 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 760 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:28,622 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:28,622 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:28,622 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:28,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:28,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,683 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:28,684 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:28,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,700 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:28,702 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:28,702 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:28,812 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,813 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:28,814 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,821 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:28,823 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:28,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:28,823 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,830 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:28,831 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:28,831 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:30:28,841 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:28,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [972863445] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:28,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:28,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:28,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144960423] [2021-05-22 02:30:28,841 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:28,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:28,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:28,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:28,842 INFO L87 Difference]: Start difference. First operand 477 states and 1498 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:28,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:28,998 INFO L93 Difference]: Finished difference Result 586 states and 1790 transitions. [2021-05-22 02:30:28,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:28,998 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:28,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:28,999 INFO L225 Difference]: With dead ends: 586 [2021-05-22 02:30:28,999 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:30:28,999 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 199.4ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:28,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:30:29,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 473. [2021-05-22 02:30:29,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1483050847457625) internal successors, (1486), 472 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:29,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1486 transitions. [2021-05-22 02:30:29,004 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1486 transitions. Word has length 21 [2021-05-22 02:30:29,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:29,004 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1486 transitions. [2021-05-22 02:30:29,004 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:29,004 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1486 transitions. [2021-05-22 02:30:29,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:29,005 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:29,005 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:29,205 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 760 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4241 [2021-05-22 02:30:29,205 INFO L430 AbstractCegarLoop]: === Iteration 772 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:29,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:29,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1600315967, now seen corresponding path program 760 times [2021-05-22 02:30:29,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:29,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791737764] [2021-05-22 02:30:29,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:29,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:29,298 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:29,298 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:29,298 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791737764] [2021-05-22 02:30:29,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791737764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:29,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [182669433] [2021-05-22 02:30:29,299 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 761 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 761 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:29,323 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:29,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:29,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:29,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:29,383 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:29,383 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:29,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:29,384 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:29,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:29,387 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:29,401 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:29,402 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:29,402 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:30:29,456 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:29,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:29,457 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:29,465 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:29,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:29,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:29,468 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:29,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:29,477 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:29,477 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:10 [2021-05-22 02:30:29,521 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:29,521 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [182669433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:29,521 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:29,521 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:29,522 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555407238] [2021-05-22 02:30:29,522 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:29,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:29,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:29,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:29,522 INFO L87 Difference]: Start difference. First operand 473 states and 1486 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:29,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:29,772 INFO L93 Difference]: Finished difference Result 645 states and 1979 transitions. [2021-05-22 02:30:29,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:29,773 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:29,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:29,773 INFO L225 Difference]: With dead ends: 645 [2021-05-22 02:30:29,773 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:30:29,774 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 218.9ms TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:29,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:30:29,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 456. [2021-05-22 02:30:29,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1274725274725275) internal successors, (1423), 455 states have internal predecessors, (1423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:29,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1423 transitions. [2021-05-22 02:30:29,778 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1423 transitions. Word has length 21 [2021-05-22 02:30:29,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:29,778 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1423 transitions. [2021-05-22 02:30:29,778 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:29,778 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1423 transitions. [2021-05-22 02:30:29,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:29,779 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:29,779 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:29,979 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4252,761 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:29,979 INFO L430 AbstractCegarLoop]: === Iteration 773 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:29,980 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:29,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1531311151, now seen corresponding path program 761 times [2021-05-22 02:30:29,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:29,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618802813] [2021-05-22 02:30:29,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:29,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:30,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:30,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:30,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618802813] [2021-05-22 02:30:30,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618802813] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:30,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769417665] [2021-05-22 02:30:30,067 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 762 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 762 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:30,092 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:30,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:30,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:30,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:30,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:30,152 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:30,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,169 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,170 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:30,170 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:30,224 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:30,224 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:30,225 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,231 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:30,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:30,233 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,239 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,239 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,239 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:30:30,252 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:30,252 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769417665] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:30,252 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:30,252 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:30,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50625255] [2021-05-22 02:30:30,252 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:30,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:30,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:30,253 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:30,253 INFO L87 Difference]: Start difference. First operand 456 states and 1423 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:30,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:30,455 INFO L93 Difference]: Finished difference Result 543 states and 1674 transitions. [2021-05-22 02:30:30,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:30,455 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:30,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:30,456 INFO L225 Difference]: With dead ends: 543 [2021-05-22 02:30:30,456 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:30:30,456 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 136.8ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:30,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:30:30,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 462. [2021-05-22 02:30:30,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1323210412147504) internal successors, (1444), 461 states have internal predecessors, (1444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:30,460 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1444 transitions. [2021-05-22 02:30:30,460 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1444 transitions. Word has length 21 [2021-05-22 02:30:30,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:30,460 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1444 transitions. [2021-05-22 02:30:30,460 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:30,460 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1444 transitions. [2021-05-22 02:30:30,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:30,461 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:30,461 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:30,661 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4258,762 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:30,661 INFO L430 AbstractCegarLoop]: === Iteration 774 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:30,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:30,662 INFO L82 PathProgramCache]: Analyzing trace with hash -2138332027, now seen corresponding path program 762 times [2021-05-22 02:30:30,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:30,662 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599407685] [2021-05-22 02:30:30,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:30,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:30,759 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:30,759 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:30,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1599407685] [2021-05-22 02:30:30,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1599407685] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:30,759 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2129066801] [2021-05-22 02:30:30,759 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 763 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 763 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:30,785 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:30,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:30,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:30,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:30,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:30,828 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,836 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:30,836 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:30:30,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:30,900 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,902 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:30,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:30,903 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,917 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:30,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:30,918 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:30,929 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:30,930 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:30,930 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:30:30,976 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:30,976 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2129066801] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:30,976 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:30,976 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:30,976 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734594884] [2021-05-22 02:30:30,977 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:30,977 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:30,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:30,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:30,977 INFO L87 Difference]: Start difference. First operand 462 states and 1444 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:31,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:31,146 INFO L93 Difference]: Finished difference Result 614 states and 1892 transitions. [2021-05-22 02:30:31,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:31,146 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:31,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:31,147 INFO L225 Difference]: With dead ends: 614 [2021-05-22 02:30:31,147 INFO L226 Difference]: Without dead ends: 587 [2021-05-22 02:30:31,147 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 184.5ms TimeCoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:31,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-05-22 02:30:31,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 462. [2021-05-22 02:30:31,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1279826464208242) internal successors, (1442), 461 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:31,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1442 transitions. [2021-05-22 02:30:31,152 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1442 transitions. Word has length 21 [2021-05-22 02:30:31,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:31,152 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1442 transitions. [2021-05-22 02:30:31,152 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:31,152 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1442 transitions. [2021-05-22 02:30:31,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:31,152 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:31,152 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:31,353 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 763 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4263 [2021-05-22 02:30:31,353 INFO L430 AbstractCegarLoop]: === Iteration 775 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:31,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:31,353 INFO L82 PathProgramCache]: Analyzing trace with hash 1872372585, now seen corresponding path program 763 times [2021-05-22 02:30:31,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:31,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [689406999] [2021-05-22 02:30:31,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:31,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:31,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:31,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:31,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [689406999] [2021-05-22 02:30:31,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [689406999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:31,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476620746] [2021-05-22 02:30:31,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 764 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 764 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:31,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:31,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:31,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:31,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:31,531 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:31,533 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:31,534 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:31,548 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:31,549 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:31,549 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:31,633 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_215, v_prenex_216]} [2021-05-22 02:30:31,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:31,636 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:31,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:31,647 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:31,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:31,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:31,655 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:31,664 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:31,665 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:31,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:31,666 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:31,674 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:31,675 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:31,675 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:30:31,724 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:31,724 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [476620746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:31,724 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:31,724 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:31,724 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1420677971] [2021-05-22 02:30:31,724 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:31,724 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:31,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:31,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:31,725 INFO L87 Difference]: Start difference. First operand 462 states and 1442 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:31,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:31,996 INFO L93 Difference]: Finished difference Result 686 states and 2102 transitions. [2021-05-22 02:30:31,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:31,997 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:31,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:31,998 INFO L225 Difference]: With dead ends: 686 [2021-05-22 02:30:31,998 INFO L226 Difference]: Without dead ends: 659 [2021-05-22 02:30:31,998 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 223.4ms TimeCoverageRelationStatistics Valid=73, Invalid=347, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:31,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-05-22 02:30:32,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 476. [2021-05-22 02:30:32,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.126315789473684) internal successors, (1485), 475 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:32,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1485 transitions. [2021-05-22 02:30:32,003 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1485 transitions. Word has length 21 [2021-05-22 02:30:32,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:32,003 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1485 transitions. [2021-05-22 02:30:32,003 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:32,003 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1485 transitions. [2021-05-22 02:30:32,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:32,003 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:32,004 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:32,204 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 764 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4271 [2021-05-22 02:30:32,204 INFO L430 AbstractCegarLoop]: === Iteration 776 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:32,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:32,204 INFO L82 PathProgramCache]: Analyzing trace with hash -736202871, now seen corresponding path program 764 times [2021-05-22 02:30:32,204 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:32,204 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266331541] [2021-05-22 02:30:32,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:32,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:32,303 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:32,303 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:32,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266331541] [2021-05-22 02:30:32,303 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266331541] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:32,303 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1295064789] [2021-05-22 02:30:32,303 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 765 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 765 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:32,329 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:32,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:32,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:32,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:32,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:32,379 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:32,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:32,388 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:32,406 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:32,407 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:32,408 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:32,503 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:32,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:32,504 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:32,509 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:32,511 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:32,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:32,512 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:32,516 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:32,517 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:32,517 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:30:32,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:32,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1295064789] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:32,547 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:32,547 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:32,547 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900464210] [2021-05-22 02:30:32,547 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:32,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:32,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:32,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:32,548 INFO L87 Difference]: Start difference. First operand 476 states and 1485 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:32,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:32,752 INFO L93 Difference]: Finished difference Result 646 states and 1979 transitions. [2021-05-22 02:30:32,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:32,752 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:32,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:32,753 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:30:32,753 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:30:32,753 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 232.3ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:32,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:30:32,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 477. [2021-05-22 02:30:32,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.134453781512605) internal successors, (1492), 476 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:32,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1492 transitions. [2021-05-22 02:30:32,758 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1492 transitions. Word has length 21 [2021-05-22 02:30:32,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:32,758 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1492 transitions. [2021-05-22 02:30:32,758 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:32,758 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1492 transitions. [2021-05-22 02:30:32,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:32,759 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:32,759 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:32,959 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 765 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4286 [2021-05-22 02:30:32,959 INFO L430 AbstractCegarLoop]: === Iteration 777 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:32,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:32,960 INFO L82 PathProgramCache]: Analyzing trace with hash -713698499, now seen corresponding path program 765 times [2021-05-22 02:30:32,960 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:32,960 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630326453] [2021-05-22 02:30:32,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:32,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:33,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:33,049 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:33,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630326453] [2021-05-22 02:30:33,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630326453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:33,050 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1006444999] [2021-05-22 02:30:33,050 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 766 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 766 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:33,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:33,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:33,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:33,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:33,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:33,138 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:33,140 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:33,156 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:33,189 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_217, v_prenex_218]} [2021-05-22 02:30:33,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:33,193 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,205 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:33,207 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:33,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:33,208 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,221 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:33,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:33,222 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,233 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:33,233 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:21 [2021-05-22 02:30:33,267 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:33,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1006444999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:33,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:33,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:33,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658625514] [2021-05-22 02:30:33,268 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:33,268 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:33,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:33,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:33,268 INFO L87 Difference]: Start difference. First operand 477 states and 1492 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:33,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:33,457 INFO L93 Difference]: Finished difference Result 605 states and 1869 transitions. [2021-05-22 02:30:33,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:33,458 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:33,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:33,459 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:30:33,459 INFO L226 Difference]: Without dead ends: 576 [2021-05-22 02:30:33,459 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 143.1ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:33,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-22 02:30:33,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 477. [2021-05-22 02:30:33,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.134453781512605) internal successors, (1492), 476 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:33,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1492 transitions. [2021-05-22 02:30:33,464 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1492 transitions. Word has length 21 [2021-05-22 02:30:33,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:33,464 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1492 transitions. [2021-05-22 02:30:33,464 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:33,464 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1492 transitions. [2021-05-22 02:30:33,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:33,465 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:33,465 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:33,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 766 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4296 [2021-05-22 02:30:33,665 INFO L430 AbstractCegarLoop]: === Iteration 778 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:33,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:33,665 INFO L82 PathProgramCache]: Analyzing trace with hash -416432089, now seen corresponding path program 766 times [2021-05-22 02:30:33,666 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:33,666 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336990921] [2021-05-22 02:30:33,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:33,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:33,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:33,767 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:33,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336990921] [2021-05-22 02:30:33,767 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336990921] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:33,767 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717751686] [2021-05-22 02:30:33,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 767 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 767 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:33,792 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:33,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:33,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:33,793 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:33,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:33,835 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,843 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:33,843 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:30:33,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:33,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:33,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:33,879 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:33,882 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,897 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,899 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:33,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:33,900 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:33,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:33,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:33,916 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:65, output treesize:19 [2021-05-22 02:30:33,988 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:33,988 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717751686] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:33,988 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:33,988 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:33,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460267181] [2021-05-22 02:30:33,988 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:33,988 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:33,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:33,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:33,988 INFO L87 Difference]: Start difference. First operand 477 states and 1492 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:34,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:34,232 INFO L93 Difference]: Finished difference Result 628 states and 1935 transitions. [2021-05-22 02:30:34,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:34,232 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:34,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:34,233 INFO L225 Difference]: With dead ends: 628 [2021-05-22 02:30:34,233 INFO L226 Difference]: Without dead ends: 605 [2021-05-22 02:30:34,233 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 205.9ms TimeCoverageRelationStatistics Valid=67, Invalid=313, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:34,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2021-05-22 02:30:34,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 476. [2021-05-22 02:30:34,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.143157894736842) internal successors, (1493), 475 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:34,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1493 transitions. [2021-05-22 02:30:34,238 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1493 transitions. Word has length 21 [2021-05-22 02:30:34,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:34,238 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1493 transitions. [2021-05-22 02:30:34,238 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:34,238 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1493 transitions. [2021-05-22 02:30:34,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:34,238 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:34,238 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:34,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4303,767 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:34,439 INFO L430 AbstractCegarLoop]: === Iteration 779 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:34,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:34,439 INFO L82 PathProgramCache]: Analyzing trace with hash -700694773, now seen corresponding path program 767 times [2021-05-22 02:30:34,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:34,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019007780] [2021-05-22 02:30:34,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:34,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:34,550 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:34,551 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:34,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019007780] [2021-05-22 02:30:34,551 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019007780] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:34,551 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860925021] [2021-05-22 02:30:34,551 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 768 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 768 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:34,576 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:34,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:34,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:34,577 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:34,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:34,625 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:34,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:34,628 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:34,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:34,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:34,643 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:34,680 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_219, v_prenex_220]} [2021-05-22 02:30:34,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:34,683 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:34,695 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:34,696 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:34,697 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:34,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:34,698 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:34,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:34,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:34,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:34,712 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:34,721 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:34,722 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:34,722 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:30:34,797 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:34,797 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860925021] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:34,797 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:34,797 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:34,797 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967428941] [2021-05-22 02:30:34,797 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:34,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:34,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:34,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:34,798 INFO L87 Difference]: Start difference. First operand 476 states and 1493 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:35,028 INFO L93 Difference]: Finished difference Result 710 states and 2164 transitions. [2021-05-22 02:30:35,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:35,028 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:35,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:35,029 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:30:35,029 INFO L226 Difference]: Without dead ends: 683 [2021-05-22 02:30:35,030 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 230.9ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:35,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2021-05-22 02:30:35,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 479. [2021-05-22 02:30:35,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1527196652719667) internal successors, (1507), 478 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1507 transitions. [2021-05-22 02:30:35,035 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1507 transitions. Word has length 21 [2021-05-22 02:30:35,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:35,035 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1507 transitions. [2021-05-22 02:30:35,035 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,035 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1507 transitions. [2021-05-22 02:30:35,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:35,036 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:35,036 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:35,236 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 768 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4310 [2021-05-22 02:30:35,236 INFO L430 AbstractCegarLoop]: === Iteration 780 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:35,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:35,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1374995017, now seen corresponding path program 768 times [2021-05-22 02:30:35,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:35,236 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111997952] [2021-05-22 02:30:35,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:35,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:35,330 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:35,330 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:35,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111997952] [2021-05-22 02:30:35,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111997952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:35,330 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203577371] [2021-05-22 02:30:35,330 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 769 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 769 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:35,357 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:35,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:35,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:35,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:35,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:35,407 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:35,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:35,409 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:35,424 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:35,425 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:35,425 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:35,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:35,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:35,480 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:35,486 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:35,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:35,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:35,489 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:35,494 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:35,495 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:35,495 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:30:35,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:35,510 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203577371] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:35,510 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:35,510 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:35,510 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906825810] [2021-05-22 02:30:35,510 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:35,510 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:35,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:35,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:35,511 INFO L87 Difference]: Start difference. First operand 479 states and 1507 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:35,731 INFO L93 Difference]: Finished difference Result 582 states and 1790 transitions. [2021-05-22 02:30:35,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:35,731 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:35,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:35,732 INFO L225 Difference]: With dead ends: 582 [2021-05-22 02:30:35,732 INFO L226 Difference]: Without dead ends: 561 [2021-05-22 02:30:35,732 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 151.0ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:35,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-05-22 02:30:35,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 475. [2021-05-22 02:30:35,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1434599156118144) internal successors, (1490), 474 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1490 transitions. [2021-05-22 02:30:35,737 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1490 transitions. Word has length 21 [2021-05-22 02:30:35,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:35,737 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1490 transitions. [2021-05-22 02:30:35,737 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:35,738 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1490 transitions. [2021-05-22 02:30:35,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:35,738 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:35,738 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:35,938 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4322,769 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:35,939 INFO L430 AbstractCegarLoop]: === Iteration 781 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:35,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:35,939 INFO L82 PathProgramCache]: Analyzing trace with hash 983546445, now seen corresponding path program 769 times [2021-05-22 02:30:35,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:35,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972201193] [2021-05-22 02:30:35,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:35,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:36,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:36,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:36,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972201193] [2021-05-22 02:30:36,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972201193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:36,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036652047] [2021-05-22 02:30:36,027 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 770 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 770 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:36,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:36,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:36,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:36,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:36,102 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,111 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,112 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:36,112 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:33 [2021-05-22 02:30:36,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:30:36,160 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:30:36,163 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,180 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,182 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:30:36,183 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,200 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,201 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:36,201 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:24 [2021-05-22 02:30:36,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:36,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036652047] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:36,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:36,235 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:36,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649314493] [2021-05-22 02:30:36,235 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:36,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:36,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:36,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:36,235 INFO L87 Difference]: Start difference. First operand 475 states and 1490 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:36,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:36,419 INFO L93 Difference]: Finished difference Result 579 states and 1790 transitions. [2021-05-22 02:30:36,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:36,419 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:36,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:36,420 INFO L225 Difference]: With dead ends: 579 [2021-05-22 02:30:36,420 INFO L226 Difference]: Without dead ends: 543 [2021-05-22 02:30:36,420 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 141.3ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:36,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-22 02:30:36,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 476. [2021-05-22 02:30:36,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1473684210526316) internal successors, (1495), 475 states have internal predecessors, (1495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:36,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1495 transitions. [2021-05-22 02:30:36,425 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1495 transitions. Word has length 21 [2021-05-22 02:30:36,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:36,425 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1495 transitions. [2021-05-22 02:30:36,425 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:36,425 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1495 transitions. [2021-05-22 02:30:36,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:36,426 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:36,426 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:36,626 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4326,770 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:36,626 INFO L430 AbstractCegarLoop]: === Iteration 782 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:36,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:36,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1280812855, now seen corresponding path program 770 times [2021-05-22 02:30:36,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:36,627 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1894797575] [2021-05-22 02:30:36,627 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:36,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:36,724 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:36,725 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:36,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1894797575] [2021-05-22 02:30:36,725 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1894797575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:36,725 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1257637162] [2021-05-22 02:30:36,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 771 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 771 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:36,749 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:36,750 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:36,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:36,750 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:36,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,806 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:36,807 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:36,810 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,825 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,826 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:36,826 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:30:36,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:36,873 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,875 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:36,876 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,892 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:36,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:36,895 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:36,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:36,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:36,910 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:70, output treesize:19 [2021-05-22 02:30:36,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:36,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1257637162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:36,984 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:36,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:36,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744354218] [2021-05-22 02:30:36,984 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:36,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:36,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:36,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:36,984 INFO L87 Difference]: Start difference. First operand 476 states and 1495 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:37,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:37,228 INFO L93 Difference]: Finished difference Result 675 states and 2076 transitions. [2021-05-22 02:30:37,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:37,228 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:37,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:37,229 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:30:37,229 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:30:37,229 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 247.5ms TimeCoverageRelationStatistics Valid=75, Invalid=345, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:37,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:30:37,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 491. [2021-05-22 02:30:37,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.163265306122449) internal successors, (1550), 490 states have internal predecessors, (1550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:37,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1550 transitions. [2021-05-22 02:30:37,240 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1550 transitions. Word has length 21 [2021-05-22 02:30:37,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:37,240 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1550 transitions. [2021-05-22 02:30:37,241 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:37,241 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1550 transitions. [2021-05-22 02:30:37,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:37,241 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:37,241 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:37,441 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 771 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4332 [2021-05-22 02:30:37,442 INFO L430 AbstractCegarLoop]: === Iteration 783 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:37,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:37,442 INFO L82 PathProgramCache]: Analyzing trace with hash 996550171, now seen corresponding path program 771 times [2021-05-22 02:30:37,442 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:37,442 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [286080306] [2021-05-22 02:30:37,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:37,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:37,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:37,576 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:37,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [286080306] [2021-05-22 02:30:37,576 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [286080306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:37,576 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531624674] [2021-05-22 02:30:37,576 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 772 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 772 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:37,609 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:30:37,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:37,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:37,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:37,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:37,667 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:37,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:37,668 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:37,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:37,672 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:37,687 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:37,687 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:37,688 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:37,728 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:30:37,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:37,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:37,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:37,735 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:37,755 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:37,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:37,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:37,759 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:37,778 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:37,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:37,779 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:19 [2021-05-22 02:30:37,859 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:37,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [531624674] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:37,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:37,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:37,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [314140329] [2021-05-22 02:30:37,860 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:37,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:37,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:37,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:37,860 INFO L87 Difference]: Start difference. First operand 491 states and 1550 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:38,062 INFO L93 Difference]: Finished difference Result 711 states and 2192 transitions. [2021-05-22 02:30:38,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:38,062 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:38,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:38,063 INFO L225 Difference]: With dead ends: 711 [2021-05-22 02:30:38,063 INFO L226 Difference]: Without dead ends: 684 [2021-05-22 02:30:38,063 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 269.5ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:38,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 684 states. [2021-05-22 02:30:38,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 684 to 497. [2021-05-22 02:30:38,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.161290322580645) internal successors, (1568), 496 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1568 transitions. [2021-05-22 02:30:38,069 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1568 transitions. Word has length 21 [2021-05-22 02:30:38,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:38,069 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1568 transitions. [2021-05-22 02:30:38,069 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,069 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1568 transitions. [2021-05-22 02:30:38,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:38,069 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:38,069 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:38,270 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 772 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4341 [2021-05-22 02:30:38,270 INFO L430 AbstractCegarLoop]: === Iteration 784 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:38,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:38,270 INFO L82 PathProgramCache]: Analyzing trace with hash -964196795, now seen corresponding path program 772 times [2021-05-22 02:30:38,270 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:38,270 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761198641] [2021-05-22 02:30:38,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:38,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:38,355 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:38,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:38,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761198641] [2021-05-22 02:30:38,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761198641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:38,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291258110] [2021-05-22 02:30:38,356 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 773 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 773 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:38,382 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:38,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:38,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:38,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:38,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:38,451 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:38,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:38,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:38,454 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:38,469 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:38,470 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:38,471 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:30:38,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:38,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:38,533 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:38,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:38,542 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:38,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:38,543 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:38,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:38,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:38,551 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:10 [2021-05-22 02:30:38,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:38,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291258110] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:38,572 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:38,572 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:38,572 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708408151] [2021-05-22 02:30:38,573 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:38,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:38,573 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:38,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:38,573 INFO L87 Difference]: Start difference. First operand 497 states and 1568 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:38,767 INFO L93 Difference]: Finished difference Result 585 states and 1808 transitions. [2021-05-22 02:30:38,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:38,767 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:38,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:38,768 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:30:38,768 INFO L226 Difference]: Without dead ends: 566 [2021-05-22 02:30:38,768 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 155.4ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:38,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2021-05-22 02:30:38,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 481. [2021-05-22 02:30:38,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.154166666666667) internal successors, (1514), 480 states have internal predecessors, (1514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1514 transitions. [2021-05-22 02:30:38,787 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1514 transitions. Word has length 21 [2021-05-22 02:30:38,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:38,787 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1514 transitions. [2021-05-22 02:30:38,787 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:38,787 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1514 transitions. [2021-05-22 02:30:38,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:38,788 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:38,788 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:38,988 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 773 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4352 [2021-05-22 02:30:38,988 INFO L430 AbstractCegarLoop]: === Iteration 785 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:38,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:38,989 INFO L82 PathProgramCache]: Analyzing trace with hash -418824141, now seen corresponding path program 773 times [2021-05-22 02:30:38,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:38,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933722959] [2021-05-22 02:30:38,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:38,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:39,088 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:39,088 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:39,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933722959] [2021-05-22 02:30:39,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933722959] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:39,088 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977381942] [2021-05-22 02:30:39,088 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 774 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 774 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:39,115 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:39,115 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:39,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:39,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:39,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,158 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:39,159 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:39,162 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,174 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:39,174 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:30:39,241 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:30:39,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:39,243 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:39,250 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,255 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,255 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:30:39,265 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:39,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977381942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:39,265 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:39,266 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:39,266 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146869424] [2021-05-22 02:30:39,266 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:39,266 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:39,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:39,266 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:39,266 INFO L87 Difference]: Start difference. First operand 481 states and 1514 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:39,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:39,418 INFO L93 Difference]: Finished difference Result 594 states and 1827 transitions. [2021-05-22 02:30:39,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:39,418 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:39,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:39,419 INFO L225 Difference]: With dead ends: 594 [2021-05-22 02:30:39,419 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:30:39,419 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 184.4ms TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:39,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:30:39,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 481. [2021-05-22 02:30:39,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.1625) internal successors, (1518), 480 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:39,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1518 transitions. [2021-05-22 02:30:39,424 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1518 transitions. Word has length 21 [2021-05-22 02:30:39,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:39,424 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1518 transitions. [2021-05-22 02:30:39,424 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:39,424 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1518 transitions. [2021-05-22 02:30:39,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:39,425 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:39,425 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:39,625 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4356,774 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:39,626 INFO L430 AbstractCegarLoop]: === Iteration 786 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:39,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:39,626 INFO L82 PathProgramCache]: Analyzing trace with hash -2137808823, now seen corresponding path program 774 times [2021-05-22 02:30:39,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:39,626 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934837166] [2021-05-22 02:30:39,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:39,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:39,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:39,715 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:39,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934837166] [2021-05-22 02:30:39,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934837166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:39,715 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446664657] [2021-05-22 02:30:39,715 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 775 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 775 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:39,742 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:30:39,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:39,743 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:39,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:39,812 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_221]} [2021-05-22 02:30:39,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:39,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,829 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,831 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:39,832 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,845 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,846 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:39,846 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:30:39,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:39,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,911 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:39,912 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:39,912 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:39,920 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:39,920 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:30:39,934 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:39,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446664657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:39,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:39,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:39,934 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041554922] [2021-05-22 02:30:39,934 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:39,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:39,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:39,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:39,935 INFO L87 Difference]: Start difference. First operand 481 states and 1518 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:40,123 INFO L93 Difference]: Finished difference Result 594 states and 1827 transitions. [2021-05-22 02:30:40,123 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:40,124 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:40,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:40,124 INFO L225 Difference]: With dead ends: 594 [2021-05-22 02:30:40,124 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:30:40,124 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 159.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:40,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:30:40,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 477. [2021-05-22 02:30:40,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.153361344537815) internal successors, (1501), 476 states have internal predecessors, (1501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1501 transitions. [2021-05-22 02:30:40,129 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1501 transitions. Word has length 21 [2021-05-22 02:30:40,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:40,129 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1501 transitions. [2021-05-22 02:30:40,129 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,129 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1501 transitions. [2021-05-22 02:30:40,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:40,130 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:40,130 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:40,330 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 775 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4362 [2021-05-22 02:30:40,330 INFO L430 AbstractCegarLoop]: === Iteration 787 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:40,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:40,331 INFO L82 PathProgramCache]: Analyzing trace with hash -741421645, now seen corresponding path program 775 times [2021-05-22 02:30:40,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:40,331 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153108033] [2021-05-22 02:30:40,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:40,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:40,438 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:40,438 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:40,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153108033] [2021-05-22 02:30:40,438 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153108033] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:40,438 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2684963] [2021-05-22 02:30:40,438 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 776 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 776 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:40,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:40,464 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:40,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:40,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:40,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:40,526 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:40,527 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:40,528 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:30:40,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:40,578 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:40,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:40,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:40,584 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:40,585 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:40,585 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:40,589 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:40,590 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:40,590 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:30:40,619 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:40,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2684963] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:40,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:40,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:40,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661733856] [2021-05-22 02:30:40,619 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:40,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:40,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:40,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:40,620 INFO L87 Difference]: Start difference. First operand 477 states and 1501 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:40,789 INFO L93 Difference]: Finished difference Result 662 states and 2041 transitions. [2021-05-22 02:30:40,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:40,789 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:40,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:40,790 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:30:40,790 INFO L226 Difference]: Without dead ends: 641 [2021-05-22 02:30:40,790 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 199.6ms TimeCoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:40,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-22 02:30:40,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 479. [2021-05-22 02:30:40,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1506276150627617) internal successors, (1506), 478 states have internal predecessors, (1506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1506 transitions. [2021-05-22 02:30:40,796 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1506 transitions. Word has length 21 [2021-05-22 02:30:40,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:40,796 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1506 transitions. [2021-05-22 02:30:40,796 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:40,796 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1506 transitions. [2021-05-22 02:30:40,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:40,796 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:40,796 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:40,996 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4367,776 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:40,997 INFO L430 AbstractCegarLoop]: === Iteration 788 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:40,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:40,997 INFO L82 PathProgramCache]: Analyzing trace with hash -2071349807, now seen corresponding path program 776 times [2021-05-22 02:30:40,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:40,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491981260] [2021-05-22 02:30:40,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:40,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:41,090 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:41,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:41,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491981260] [2021-05-22 02:30:41,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1491981260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:41,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2070211234] [2021-05-22 02:30:41,091 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 777 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 777 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:41,116 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:41,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:41,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:41,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:41,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:41,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:41,184 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:30:41,207 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:41,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:41,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,216 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:41,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:41,217 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,222 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,223 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,223 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:30:41,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:41,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2070211234] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:41,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:41,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:41,238 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305037040] [2021-05-22 02:30:41,238 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:41,238 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:41,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:41,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:41,238 INFO L87 Difference]: Start difference. First operand 479 states and 1506 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:41,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:41,389 INFO L93 Difference]: Finished difference Result 575 states and 1776 transitions. [2021-05-22 02:30:41,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:41,389 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:41,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:41,390 INFO L225 Difference]: With dead ends: 575 [2021-05-22 02:30:41,390 INFO L226 Difference]: Without dead ends: 554 [2021-05-22 02:30:41,390 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 139.4ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:41,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2021-05-22 02:30:41,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 476. [2021-05-22 02:30:41,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1452631578947368) internal successors, (1494), 475 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:41,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1494 transitions. [2021-05-22 02:30:41,395 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1494 transitions. Word has length 21 [2021-05-22 02:30:41,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:41,395 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1494 transitions. [2021-05-22 02:30:41,395 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:41,396 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1494 transitions. [2021-05-22 02:30:41,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:41,396 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:41,396 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:41,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 777 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4373 [2021-05-22 02:30:41,597 INFO L430 AbstractCegarLoop]: === Iteration 789 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:41,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:41,597 INFO L82 PathProgramCache]: Analyzing trace with hash 1308536001, now seen corresponding path program 777 times [2021-05-22 02:30:41,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:41,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589833349] [2021-05-22 02:30:41,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:41,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:41,691 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:41,691 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:41,691 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589833349] [2021-05-22 02:30:41,692 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589833349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:41,692 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344641514] [2021-05-22 02:30:41,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 778 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 778 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:41,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:30:41,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:41,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:41,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:41,802 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:41,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:41,803 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,809 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,810 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:41,810 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:30:41,836 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:41,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:41,837 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:41,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:41,847 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,854 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:41,854 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:41,854 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:30:41,905 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:41,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344641514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:41,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:41,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:41,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198911366] [2021-05-22 02:30:41,906 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:41,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:41,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:41,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:41,906 INFO L87 Difference]: Start difference. First operand 476 states and 1494 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:42,088 INFO L93 Difference]: Finished difference Result 654 states and 2005 transitions. [2021-05-22 02:30:42,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:42,088 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:42,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:42,089 INFO L225 Difference]: With dead ends: 654 [2021-05-22 02:30:42,089 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:30:42,089 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 209.5ms TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:42,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:30:42,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 455. [2021-05-22 02:30:42,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 3.1277533039647576) internal successors, (1420), 454 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 1420 transitions. [2021-05-22 02:30:42,094 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 1420 transitions. Word has length 21 [2021-05-22 02:30:42,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:42,094 INFO L482 AbstractCegarLoop]: Abstraction has 455 states and 1420 transitions. [2021-05-22 02:30:42,094 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,094 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 1420 transitions. [2021-05-22 02:30:42,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:42,095 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:42,095 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:42,295 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4375,778 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:42,295 INFO L430 AbstractCegarLoop]: === Iteration 790 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:42,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:42,295 INFO L82 PathProgramCache]: Analyzing trace with hash -1158811613, now seen corresponding path program 778 times [2021-05-22 02:30:42,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:42,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1769873367] [2021-05-22 02:30:42,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:42,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:42,356 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:42,356 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:42,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1769873367] [2021-05-22 02:30:42,356 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1769873367] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:42,356 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392630886] [2021-05-22 02:30:42,356 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 779 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 779 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:42,381 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:42,381 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:42,382 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:42,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:42,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:42,403 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:42,405 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,411 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:42,411 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:42,412 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:30:42,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:42,429 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,432 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:42,432 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:42,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,432 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:30:42,445 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:42,445 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392630886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:42,445 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:42,445 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:30:42,445 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256331336] [2021-05-22 02:30:42,445 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:30:42,445 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:42,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:30:42,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:30:42,446 INFO L87 Difference]: Start difference. First operand 455 states and 1420 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:42,591 INFO L93 Difference]: Finished difference Result 758 states and 2309 transitions. [2021-05-22 02:30:42,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:42,591 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:42,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:42,592 INFO L225 Difference]: With dead ends: 758 [2021-05-22 02:30:42,592 INFO L226 Difference]: Without dead ends: 736 [2021-05-22 02:30:42,592 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 71.4ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:30:42,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 736 states. [2021-05-22 02:30:42,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 736 to 461. [2021-05-22 02:30:42,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.132608695652174) internal successors, (1441), 460 states have internal predecessors, (1441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1441 transitions. [2021-05-22 02:30:42,598 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1441 transitions. Word has length 21 [2021-05-22 02:30:42,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:42,598 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1441 transitions. [2021-05-22 02:30:42,598 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:42,598 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1441 transitions. [2021-05-22 02:30:42,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:42,598 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:42,598 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:42,799 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4378,779 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:42,799 INFO L430 AbstractCegarLoop]: === Iteration 791 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:42,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:42,799 INFO L82 PathProgramCache]: Analyzing trace with hash -879667217, now seen corresponding path program 779 times [2021-05-22 02:30:42,799 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:42,799 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384240689] [2021-05-22 02:30:42,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:42,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:42,871 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:42,872 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:42,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384240689] [2021-05-22 02:30:42,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1384240689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:42,872 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1891572726] [2021-05-22 02:30:42,872 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 780 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 780 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:42,898 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:42,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:42,898 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:30:42,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:42,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:42,917 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:42,919 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:42,934 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:42,935 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:42,935 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:61, output treesize:47 [2021-05-22 02:30:43,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:30:43,014 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:43,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:43,017 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:43,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:30:43,020 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:43,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:43,022 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:43,045 INFO L628 ElimStorePlain]: treesize reduction 8, result has 76.5 percent of original size [2021-05-22 02:30:43,045 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:43,046 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:30:43,046 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:101, output treesize:26 [2021-05-22 02:30:43,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:43,118 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1891572726] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:43,118 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:43,118 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:43,118 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665649304] [2021-05-22 02:30:43,118 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:43,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:43,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:43,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:43,118 INFO L87 Difference]: Start difference. First operand 461 states and 1441 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:43,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:43,778 INFO L93 Difference]: Finished difference Result 822 states and 2513 transitions. [2021-05-22 02:30:43,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:30:43,779 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:43,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:43,780 INFO L225 Difference]: With dead ends: 822 [2021-05-22 02:30:43,780 INFO L226 Difference]: Without dead ends: 768 [2021-05-22 02:30:43,780 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 615.1ms TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:30:43,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 768 states. [2021-05-22 02:30:43,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 768 to 462. [2021-05-22 02:30:43,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1323210412147504) internal successors, (1444), 461 states have internal predecessors, (1444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:43,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1444 transitions. [2021-05-22 02:30:43,786 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1444 transitions. Word has length 21 [2021-05-22 02:30:43,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:43,786 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1444 transitions. [2021-05-22 02:30:43,786 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:43,786 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1444 transitions. [2021-05-22 02:30:43,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:43,787 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:43,787 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:43,987 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 780 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4381 [2021-05-22 02:30:43,987 INFO L430 AbstractCegarLoop]: === Iteration 792 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:43,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:43,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1163929901, now seen corresponding path program 780 times [2021-05-22 02:30:43,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:43,988 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262717118] [2021-05-22 02:30:43,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:43,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:44,065 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:44,065 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:44,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262717118] [2021-05-22 02:30:44,065 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [262717118] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:44,065 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698708111] [2021-05-22 02:30:44,065 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 781 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 781 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:44,091 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:44,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:44,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:44,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:44,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:44,129 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:44,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:44,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:44,131 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:44,143 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:44,144 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:44,144 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:29 [2021-05-22 02:30:44,229 INFO L446 ElimStorePlain]: Different costs {0=[o_2, v_prenex_222, v_prenex_223], 1=[o_0]} [2021-05-22 02:30:44,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:44,232 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:44,242 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:44,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:44,245 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:44,253 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:44,253 INFO L518 ElimStorePlain]: Eliminatee v_prenex_223 vanished before elimination [2021-05-22 02:30:44,255 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:44,255 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:44,256 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:44,264 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:44,264 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:44,265 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:30:44,313 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:44,313 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1698708111] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:44,313 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:44,313 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:44,313 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282018192] [2021-05-22 02:30:44,314 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:44,314 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:44,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:44,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:44,314 INFO L87 Difference]: Start difference. First operand 462 states and 1444 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:44,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:44,822 INFO L93 Difference]: Finished difference Result 954 states and 2915 transitions. [2021-05-22 02:30:44,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:30:44,823 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:44,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:44,824 INFO L225 Difference]: With dead ends: 954 [2021-05-22 02:30:44,824 INFO L226 Difference]: Without dead ends: 927 [2021-05-22 02:30:44,824 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 380.1ms TimeCoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:30:44,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 927 states. [2021-05-22 02:30:44,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 927 to 486. [2021-05-22 02:30:44,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.154639175257732) internal successors, (1530), 485 states have internal predecessors, (1530), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:44,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1530 transitions. [2021-05-22 02:30:44,830 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1530 transitions. Word has length 21 [2021-05-22 02:30:44,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:44,830 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1530 transitions. [2021-05-22 02:30:44,830 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:44,830 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1530 transitions. [2021-05-22 02:30:44,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:44,831 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:44,831 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:45,031 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 781 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4392 [2021-05-22 02:30:45,031 INFO L430 AbstractCegarLoop]: === Iteration 793 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:45,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:45,031 INFO L82 PathProgramCache]: Analyzing trace with hash 522461939, now seen corresponding path program 781 times [2021-05-22 02:30:45,032 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:45,032 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066250514] [2021-05-22 02:30:45,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:45,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:45,106 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:45,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:45,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066250514] [2021-05-22 02:30:45,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1066250514] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:45,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631987138] [2021-05-22 02:30:45,106 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 782 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 782 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:45,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:45,131 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:45,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:45,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:45,168 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,170 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:45,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:45,171 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,183 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:45,184 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:45,184 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:29 [2021-05-22 02:30:45,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:45,253 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,256 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:45,256 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:45,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,256 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:30:45,285 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:45,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [631987138] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:45,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:45,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:45,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326015464] [2021-05-22 02:30:45,286 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:45,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:45,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:45,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:45,286 INFO L87 Difference]: Start difference. First operand 486 states and 1530 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:45,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:45,560 INFO L93 Difference]: Finished difference Result 872 states and 2685 transitions. [2021-05-22 02:30:45,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:45,561 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:45,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:45,562 INFO L225 Difference]: With dead ends: 872 [2021-05-22 02:30:45,562 INFO L226 Difference]: Without dead ends: 851 [2021-05-22 02:30:45,562 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 230.3ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:30:45,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 851 states. [2021-05-22 02:30:45,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 851 to 484. [2021-05-22 02:30:45,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1573498964803313) internal successors, (1525), 483 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:45,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1525 transitions. [2021-05-22 02:30:45,568 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1525 transitions. Word has length 21 [2021-05-22 02:30:45,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:45,568 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1525 transitions. [2021-05-22 02:30:45,568 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:45,568 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1525 transitions. [2021-05-22 02:30:45,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:45,569 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:45,569 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:45,769 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4404,782 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:45,769 INFO L430 AbstractCegarLoop]: === Iteration 794 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:45,769 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:45,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1562697737, now seen corresponding path program 782 times [2021-05-22 02:30:45,769 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:45,769 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9928946] [2021-05-22 02:30:45,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:45,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:45,841 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:45,841 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:45,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9928946] [2021-05-22 02:30:45,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9928946] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:45,841 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273069341] [2021-05-22 02:30:45,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 783 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 783 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:45,865 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:45,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:45,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:45,866 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:45,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:45,887 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:45,889 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:45,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:45,896 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:30:45,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:45,950 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:45,952 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:45,953 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:45,953 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:30:45,980 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:45,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [273069341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:45,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:45,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:45,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661063909] [2021-05-22 02:30:45,980 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:45,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:45,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:45,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:45,980 INFO L87 Difference]: Start difference. First operand 484 states and 1525 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:46,482 INFO L93 Difference]: Finished difference Result 1026 states and 3143 transitions. [2021-05-22 02:30:46,482 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:30:46,482 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:46,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:46,484 INFO L225 Difference]: With dead ends: 1026 [2021-05-22 02:30:46,484 INFO L226 Difference]: Without dead ends: 1005 [2021-05-22 02:30:46,484 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 367.1ms TimeCoverageRelationStatistics Valid=182, Invalid=810, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:30:46,485 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1005 states. [2021-05-22 02:30:46,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1005 to 482. [2021-05-22 02:30:46,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1600831600831603) internal successors, (1520), 481 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1520 transitions. [2021-05-22 02:30:46,491 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1520 transitions. Word has length 21 [2021-05-22 02:30:46,491 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:46,491 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1520 transitions. [2021-05-22 02:30:46,491 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,491 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1520 transitions. [2021-05-22 02:30:46,491 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:46,491 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:46,491 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:46,692 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 783 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4411 [2021-05-22 02:30:46,692 INFO L430 AbstractCegarLoop]: === Iteration 795 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:46,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:46,692 INFO L82 PathProgramCache]: Analyzing trace with hash 968940535, now seen corresponding path program 783 times [2021-05-22 02:30:46,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:46,692 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [789909066] [2021-05-22 02:30:46,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:46,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:46,766 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:46,766 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:46,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [789909066] [2021-05-22 02:30:46,766 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [789909066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:46,766 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1850114437] [2021-05-22 02:30:46,766 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 784 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 784 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:46,790 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:46,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:46,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:46,791 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:46,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:46,812 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:46,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:46,814 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:46,820 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:46,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:46,821 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:30:46,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:46,856 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:46,859 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:46,859 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:46,860 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:46,860 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:30:46,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:46,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1850114437] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:46,873 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:46,873 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:30:46,873 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515609431] [2021-05-22 02:30:46,873 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:30:46,873 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:46,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:30:46,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:30:46,873 INFO L87 Difference]: Start difference. First operand 482 states and 1520 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:46,985 INFO L93 Difference]: Finished difference Result 758 states and 2345 transitions. [2021-05-22 02:30:46,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:46,985 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:46,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:46,986 INFO L225 Difference]: With dead ends: 758 [2021-05-22 02:30:46,986 INFO L226 Difference]: Without dead ends: 736 [2021-05-22 02:30:46,986 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 102.6ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:46,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 736 states. [2021-05-22 02:30:46,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 736 to 484. [2021-05-22 02:30:46,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1573498964803313) internal successors, (1525), 483 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1525 transitions. [2021-05-22 02:30:46,992 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1525 transitions. Word has length 21 [2021-05-22 02:30:46,992 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:46,992 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1525 transitions. [2021-05-22 02:30:46,992 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:46,992 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1525 transitions. [2021-05-22 02:30:46,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:46,992 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:46,992 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:47,192 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4417,784 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:47,193 INFO L430 AbstractCegarLoop]: === Iteration 796 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:47,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:47,193 INFO L82 PathProgramCache]: Analyzing trace with hash -1276069115, now seen corresponding path program 784 times [2021-05-22 02:30:47,193 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:47,193 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676847094] [2021-05-22 02:30:47,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:47,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:47,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:47,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:47,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676847094] [2021-05-22 02:30:47,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676847094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:47,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022771881] [2021-05-22 02:30:47,268 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 785 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 785 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:47,292 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:47,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:47,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:47,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:47,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:47,314 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:47,316 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:47,323 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:47,323 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:30:47,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:47,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:47,348 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:47,356 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:47,357 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:47,357 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:30:47,378 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:47,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1022771881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:47,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:47,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:30:47,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558538103] [2021-05-22 02:30:47,379 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:30:47,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:47,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:30:47,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:30:47,379 INFO L87 Difference]: Start difference. First operand 484 states and 1525 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:47,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:47,545 INFO L93 Difference]: Finished difference Result 769 states and 2372 transitions. [2021-05-22 02:30:47,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:47,545 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:47,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:47,546 INFO L225 Difference]: With dead ends: 769 [2021-05-22 02:30:47,546 INFO L226 Difference]: Without dead ends: 740 [2021-05-22 02:30:47,546 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 110.1ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:47,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 740 states. [2021-05-22 02:30:47,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 740 to 477. [2021-05-22 02:30:47,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.149159663865546) internal successors, (1499), 476 states have internal predecessors, (1499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:47,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1499 transitions. [2021-05-22 02:30:47,551 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1499 transitions. Word has length 21 [2021-05-22 02:30:47,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:47,551 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1499 transitions. [2021-05-22 02:30:47,551 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:47,551 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1499 transitions. [2021-05-22 02:30:47,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:47,552 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:47,552 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:47,752 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 785 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4420 [2021-05-22 02:30:47,752 INFO L430 AbstractCegarLoop]: === Iteration 797 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:47,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:47,753 INFO L82 PathProgramCache]: Analyzing trace with hash 30815813, now seen corresponding path program 785 times [2021-05-22 02:30:47,753 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:47,753 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214643846] [2021-05-22 02:30:47,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:47,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:47,833 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:47,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:47,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214643846] [2021-05-22 02:30:47,833 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214643846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:47,833 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914798651] [2021-05-22 02:30:47,833 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 786 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 786 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:47,858 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:47,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:47,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:47,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:47,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:47,893 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:47,895 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:47,905 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:47,905 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:47,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:47,941 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,944 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:47,945 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:47,945 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:47,945 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:30:47,958 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:47,958 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914798651] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:47,958 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:47,958 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:30:47,958 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726598299] [2021-05-22 02:30:47,958 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:30:47,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:47,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:30:47,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:47,958 INFO L87 Difference]: Start difference. First operand 477 states and 1499 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:48,072 INFO L93 Difference]: Finished difference Result 602 states and 1865 transitions. [2021-05-22 02:30:48,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:48,072 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:48,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:48,073 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:30:48,073 INFO L226 Difference]: Without dead ends: 580 [2021-05-22 02:30:48,073 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 114.8ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:48,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-22 02:30:48,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 483. [2021-05-22 02:30:48,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1535269709543567) internal successors, (1520), 482 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1520 transitions. [2021-05-22 02:30:48,078 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1520 transitions. Word has length 21 [2021-05-22 02:30:48,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:48,078 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1520 transitions. [2021-05-22 02:30:48,078 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,078 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1520 transitions. [2021-05-22 02:30:48,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:48,079 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:48,079 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:48,279 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4424,786 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:48,280 INFO L430 AbstractCegarLoop]: === Iteration 798 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:48,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:48,280 INFO L82 PathProgramCache]: Analyzing trace with hash 656139931, now seen corresponding path program 786 times [2021-05-22 02:30:48,280 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:48,280 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833066583] [2021-05-22 02:30:48,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:48,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:48,379 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:48,379 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:48,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833066583] [2021-05-22 02:30:48,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833066583] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:48,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11049357] [2021-05-22 02:30:48,380 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 787 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 787 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:48,407 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:48,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:48,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:48,408 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:48,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:48,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:48,443 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:48,443 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:48,444 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:30:48,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:48,480 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:48,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:48,482 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:48,488 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:48,488 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:48,488 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:48,488 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:30:48,532 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:48,532 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11049357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:48,532 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:48,532 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:48,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164435588] [2021-05-22 02:30:48,532 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:48,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:48,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:48,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:48,533 INFO L87 Difference]: Start difference. First operand 483 states and 1520 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:48,676 INFO L93 Difference]: Finished difference Result 673 states and 2083 transitions. [2021-05-22 02:30:48,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:48,676 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:48,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:48,677 INFO L225 Difference]: With dead ends: 673 [2021-05-22 02:30:48,677 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:30:48,677 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 165.4ms TimeCoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:48,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:30:48,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 483. [2021-05-22 02:30:48,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.1493775933609958) internal successors, (1518), 482 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1518 transitions. [2021-05-22 02:30:48,682 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1518 transitions. Word has length 21 [2021-05-22 02:30:48,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:48,683 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1518 transitions. [2021-05-22 02:30:48,683 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:48,683 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1518 transitions. [2021-05-22 02:30:48,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:48,683 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:48,683 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:48,883 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 787 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4427 [2021-05-22 02:30:48,884 INFO L430 AbstractCegarLoop]: === Iteration 799 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:48,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:48,884 INFO L82 PathProgramCache]: Analyzing trace with hash 371877247, now seen corresponding path program 787 times [2021-05-22 02:30:48,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:48,884 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103069841] [2021-05-22 02:30:48,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:48,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:48,973 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:48,973 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:48,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103069841] [2021-05-22 02:30:48,973 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103069841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:48,973 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658722735] [2021-05-22 02:30:48,973 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 788 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 788 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:48,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:48,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:48,999 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:49,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:49,036 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:49,038 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,046 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,047 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:49,047 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:49,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:49,094 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,101 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,101 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:49,103 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:49,104 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,109 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,109 INFO L518 ElimStorePlain]: Eliminatee v_prenex_225 vanished before elimination [2021-05-22 02:30:49,110 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:49,110 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:30:49,157 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:49,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658722735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:49,157 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:49,157 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:49,157 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784457474] [2021-05-22 02:30:49,157 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:49,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:49,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:49,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:49,158 INFO L87 Difference]: Start difference. First operand 483 states and 1518 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:49,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:49,368 INFO L93 Difference]: Finished difference Result 794 states and 2445 transitions. [2021-05-22 02:30:49,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:49,368 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:49,369 INFO L225 Difference]: With dead ends: 794 [2021-05-22 02:30:49,370 INFO L226 Difference]: Without dead ends: 767 [2021-05-22 02:30:49,370 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 195.2ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:49,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 767 states. [2021-05-22 02:30:49,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 767 to 489. [2021-05-22 02:30:49,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.153688524590164) internal successors, (1539), 488 states have internal predecessors, (1539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:49,375 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1539 transitions. [2021-05-22 02:30:49,376 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1539 transitions. Word has length 21 [2021-05-22 02:30:49,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:49,376 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1539 transitions. [2021-05-22 02:30:49,376 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:49,376 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1539 transitions. [2021-05-22 02:30:49,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:49,376 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:49,376 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:49,577 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 788 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4430 [2021-05-22 02:30:49,577 INFO L430 AbstractCegarLoop]: === Iteration 800 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:49,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:49,577 INFO L82 PathProgramCache]: Analyzing trace with hash 2058269087, now seen corresponding path program 788 times [2021-05-22 02:30:49,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:49,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [906205151] [2021-05-22 02:30:49,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:49,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:49,671 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:49,671 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:49,671 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [906205151] [2021-05-22 02:30:49,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [906205151] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:49,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1166111820] [2021-05-22 02:30:49,672 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 789 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 789 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:49,697 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:49,697 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:49,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:49,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:49,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:49,748 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:49,751 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,766 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:49,766 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:49,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:49,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:49,852 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,857 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,858 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:49,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:49,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,864 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:49,864 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:49,864 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:30:49,894 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:49,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1166111820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:49,894 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:49,894 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:49,894 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396794332] [2021-05-22 02:30:49,894 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:49,894 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:49,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:49,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:49,895 INFO L87 Difference]: Start difference. First operand 489 states and 1539 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:50,222 INFO L93 Difference]: Finished difference Result 746 states and 2300 transitions. [2021-05-22 02:30:50,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:50,223 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:50,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:50,224 INFO L225 Difference]: With dead ends: 746 [2021-05-22 02:30:50,224 INFO L226 Difference]: Without dead ends: 725 [2021-05-22 02:30:50,224 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 240.5ms TimeCoverageRelationStatistics Valid=79, Invalid=383, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:30:50,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 725 states. [2021-05-22 02:30:50,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 725 to 488. [2021-05-22 02:30:50,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.1601642710472277) internal successors, (1539), 487 states have internal predecessors, (1539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1539 transitions. [2021-05-22 02:30:50,230 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1539 transitions. Word has length 21 [2021-05-22 02:30:50,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:50,230 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1539 transitions. [2021-05-22 02:30:50,230 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,230 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1539 transitions. [2021-05-22 02:30:50,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:50,230 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:50,230 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:50,431 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 789 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4441 [2021-05-22 02:30:50,431 INFO L430 AbstractCegarLoop]: === Iteration 801 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:50,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:50,431 INFO L82 PathProgramCache]: Analyzing trace with hash 2080773459, now seen corresponding path program 789 times [2021-05-22 02:30:50,431 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:50,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115048441] [2021-05-22 02:30:50,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:50,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:50,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:50,509 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:50,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115048441] [2021-05-22 02:30:50,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115048441] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:50,509 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [102823820] [2021-05-22 02:30:50,509 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 790 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 790 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:50,536 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:30:50,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:50,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:50,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:50,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:50,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:50,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:50,574 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:50,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:50,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:50,583 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:50,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:50,610 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:50,620 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:50,620 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:50,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:50,623 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:50,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:50,631 INFO L518 ElimStorePlain]: Eliminatee v_prenex_227 vanished before elimination [2021-05-22 02:30:50,632 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:50,632 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:30:50,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:50,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [102823820] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:50,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:50,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:30:50,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758760249] [2021-05-22 02:30:50,665 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:30:50,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:50,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:30:50,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:50,666 INFO L87 Difference]: Start difference. First operand 488 states and 1539 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:50,868 INFO L93 Difference]: Finished difference Result 654 states and 2031 transitions. [2021-05-22 02:30:50,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:50,868 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:50,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:50,869 INFO L225 Difference]: With dead ends: 654 [2021-05-22 02:30:50,869 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:30:50,869 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 117.2ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:50,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:30:50,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 488. [2021-05-22 02:30:50,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.1601642710472277) internal successors, (1539), 487 states have internal predecessors, (1539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1539 transitions. [2021-05-22 02:30:50,875 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1539 transitions. Word has length 21 [2021-05-22 02:30:50,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:50,875 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1539 transitions. [2021-05-22 02:30:50,875 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:50,875 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1539 transitions. [2021-05-22 02:30:50,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:50,875 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:50,875 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:51,076 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 790 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4448 [2021-05-22 02:30:51,076 INFO L430 AbstractCegarLoop]: === Iteration 802 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:51,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:51,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1916927427, now seen corresponding path program 790 times [2021-05-22 02:30:51,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:51,076 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930229073] [2021-05-22 02:30:51,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:51,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:51,162 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:51,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:51,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930229073] [2021-05-22 02:30:51,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1930229073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:51,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1771058641] [2021-05-22 02:30:51,162 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 791 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 791 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:51,187 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:51,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:51,188 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:51,188 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:51,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:51,218 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,223 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:51,223 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,223 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:30:51,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:51,245 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:30:51,247 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:51,256 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:51,256 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:51,256 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:30:51,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:51,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1771058641] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:51,324 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:51,324 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:51,324 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [790755490] [2021-05-22 02:30:51,325 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:51,325 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:51,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:51,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:51,325 INFO L87 Difference]: Start difference. First operand 488 states and 1539 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:51,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:51,521 INFO L93 Difference]: Finished difference Result 677 states and 2097 transitions. [2021-05-22 02:30:51,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:30:51,521 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:51,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:51,522 INFO L225 Difference]: With dead ends: 677 [2021-05-22 02:30:51,522 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:30:51,522 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 173.0ms TimeCoverageRelationStatistics Valid=64, Invalid=278, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:30:51,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:30:51,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 487. [2021-05-22 02:30:51,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.168724279835391) internal successors, (1540), 486 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:51,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1540 transitions. [2021-05-22 02:30:51,527 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1540 transitions. Word has length 21 [2021-05-22 02:30:51,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:51,528 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1540 transitions. [2021-05-22 02:30:51,528 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:51,528 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1540 transitions. [2021-05-22 02:30:51,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:51,528 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:51,528 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:51,728 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 791 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4453 [2021-05-22 02:30:51,729 INFO L430 AbstractCegarLoop]: === Iteration 803 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:51,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:51,729 INFO L82 PathProgramCache]: Analyzing trace with hash 2093777185, now seen corresponding path program 791 times [2021-05-22 02:30:51,729 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:51,729 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628373936] [2021-05-22 02:30:51,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:51,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:51,823 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:51,824 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:51,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628373936] [2021-05-22 02:30:51,824 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1628373936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:51,824 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [228301477] [2021-05-22 02:30:51,824 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 792 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 792 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:51,849 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:51,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:51,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:30:51,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:51,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:51,885 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:51,887 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:51,890 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:51,893 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,919 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:51,920 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:30:51,920 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:101, output treesize:69 [2021-05-22 02:30:51,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:51,967 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:51,997 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:51,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:52,000 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:52,029 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:52,029 INFO L518 ElimStorePlain]: Eliminatee v_prenex_229 vanished before elimination [2021-05-22 02:30:52,029 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:52,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:52,032 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:52,059 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:52,059 INFO L518 ElimStorePlain]: Eliminatee v_prenex_231 vanished before elimination [2021-05-22 02:30:52,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:52,062 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:52,086 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:52,087 INFO L518 ElimStorePlain]: Eliminatee v_prenex_233 vanished before elimination [2021-05-22 02:30:52,087 INFO L550 ElimStorePlain]: Start of recursive call 1: 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:30:52,087 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:105, output treesize:57 [2021-05-22 02:30:52,206 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:52,206 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [228301477] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:52,206 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:52,206 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:52,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304878436] [2021-05-22 02:30:52,206 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:52,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:52,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:52,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:52,207 INFO L87 Difference]: Start difference. First operand 487 states and 1540 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:52,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:52,708 INFO L93 Difference]: Finished difference Result 896 states and 2734 transitions. [2021-05-22 02:30:52,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:30:52,709 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:52,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:52,710 INFO L225 Difference]: With dead ends: 896 [2021-05-22 02:30:52,710 INFO L226 Difference]: Without dead ends: 848 [2021-05-22 02:30:52,710 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 474.7ms TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:30:52,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 848 states. [2021-05-22 02:30:52,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 848 to 486. [2021-05-22 02:30:52,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.162886597938144) internal successors, (1534), 485 states have internal predecessors, (1534), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:52,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1534 transitions. [2021-05-22 02:30:52,717 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1534 transitions. Word has length 21 [2021-05-22 02:30:52,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:52,717 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1534 transitions. [2021-05-22 02:30:52,717 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:52,717 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1534 transitions. [2021-05-22 02:30:52,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:52,718 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:52,718 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:52,918 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4459,792 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:52,918 INFO L430 AbstractCegarLoop]: === Iteration 804 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:52,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:52,918 INFO L82 PathProgramCache]: Analyzing trace with hash -125500321, now seen corresponding path program 792 times [2021-05-22 02:30:52,918 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:52,918 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693294314] [2021-05-22 02:30:52,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:52,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:53,003 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:53,003 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:53,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693294314] [2021-05-22 02:30:53,003 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693294314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:53,003 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078305277] [2021-05-22 02:30:53,003 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 793 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 793 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:53,029 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:30:53,030 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:53,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:53,030 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:53,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:53,080 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:53,082 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:53,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:53,098 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:30:53,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:53,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:53,151 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,159 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:53,160 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:53,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:53,161 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,167 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:53,167 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,167 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:30:53,182 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:53,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078305277] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:53,182 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:53,182 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:53,182 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [379331472] [2021-05-22 02:30:53,182 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:53,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:53,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:53,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:53,182 INFO L87 Difference]: Start difference. First operand 486 states and 1534 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:53,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:53,378 INFO L93 Difference]: Finished difference Result 638 states and 1969 transitions. [2021-05-22 02:30:53,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:53,379 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:53,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:53,379 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:30:53,380 INFO L226 Difference]: Without dead ends: 617 [2021-05-22 02:30:53,380 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 141.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:53,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 617 states. [2021-05-22 02:30:53,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 617 to 481. [2021-05-22 02:30:53,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.15) internal successors, (1512), 480 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:53,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1512 transitions. [2021-05-22 02:30:53,385 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1512 transitions. Word has length 21 [2021-05-22 02:30:53,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:53,385 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1512 transitions. [2021-05-22 02:30:53,385 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:53,385 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1512 transitions. [2021-05-22 02:30:53,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:53,385 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:53,385 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:53,585 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4469,793 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:53,586 INFO L430 AbstractCegarLoop]: === Iteration 805 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:53,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:53,586 INFO L82 PathProgramCache]: Analyzing trace with hash -516948893, now seen corresponding path program 793 times [2021-05-22 02:30:53,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:53,586 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137834372] [2021-05-22 02:30:53,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:53,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:53,653 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:53,653 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:53,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137834372] [2021-05-22 02:30:53,653 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137834372] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:53,653 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [173813544] [2021-05-22 02:30:53,653 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 794 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 794 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:53,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:53,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:53,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:53,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:53,719 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:53,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,724 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:30:53,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:30:53,746 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:30:53,748 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:53,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:53,757 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:30:53,757 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:53,757 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:30:53,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:53,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [173813544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:53,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:53,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:30:53,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636670232] [2021-05-22 02:30:53,790 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:30:53,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:53,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:30:53,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:53,790 INFO L87 Difference]: Start difference. First operand 481 states and 1512 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:53,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:53,997 INFO L93 Difference]: Finished difference Result 620 states and 1915 transitions. [2021-05-22 02:30:53,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:53,997 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:53,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:53,998 INFO L225 Difference]: With dead ends: 620 [2021-05-22 02:30:53,998 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:30:53,998 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 114.4ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:53,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:30:54,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 482. [2021-05-22 02:30:54,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1538461538461537) internal successors, (1517), 481 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:54,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1517 transitions. [2021-05-22 02:30:54,004 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1517 transitions. Word has length 21 [2021-05-22 02:30:54,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:54,004 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1517 transitions. [2021-05-22 02:30:54,004 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:54,004 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1517 transitions. [2021-05-22 02:30:54,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:54,004 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:54,005 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:54,205 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4473,794 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:54,205 INFO L430 AbstractCegarLoop]: === Iteration 806 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:54,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:54,205 INFO L82 PathProgramCache]: Analyzing trace with hash -219682483, now seen corresponding path program 794 times [2021-05-22 02:30:54,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:54,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902297407] [2021-05-22 02:30:54,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:54,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:54,289 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:54,290 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:54,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902297407] [2021-05-22 02:30:54,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902297407] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:54,290 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2061748382] [2021-05-22 02:30:54,290 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 795 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 795 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:54,316 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:54,316 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:54,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:54,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:54,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:54,356 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:54,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:54,358 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:54,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:54,368 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:54,368 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:54,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:54,395 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:54,404 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:54,405 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:30:54,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:54,407 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:54,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:54,416 INFO L518 ElimStorePlain]: Eliminatee v_prenex_235 vanished before elimination [2021-05-22 02:30:54,416 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:54,416 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:30:54,484 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:54,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2061748382] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:54,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:54,485 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:54,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635576347] [2021-05-22 02:30:54,485 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:54,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:54,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:54,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:54,485 INFO L87 Difference]: Start difference. First operand 482 states and 1517 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:54,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:54,703 INFO L93 Difference]: Finished difference Result 703 states and 2163 transitions. [2021-05-22 02:30:54,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:30:54,703 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:54,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:54,704 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:30:54,704 INFO L226 Difference]: Without dead ends: 680 [2021-05-22 02:30:54,705 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 229.9ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:30:54,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 680 states. [2021-05-22 02:30:54,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 680 to 497. [2021-05-22 02:30:54,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1693548387096775) internal successors, (1572), 496 states have internal predecessors, (1572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:54,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1572 transitions. [2021-05-22 02:30:54,710 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1572 transitions. Word has length 21 [2021-05-22 02:30:54,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:54,710 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1572 transitions. [2021-05-22 02:30:54,710 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:54,710 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1572 transitions. [2021-05-22 02:30:54,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:54,711 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:54,711 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:54,911 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4476,795 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:54,911 INFO L430 AbstractCegarLoop]: === Iteration 807 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:54,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:54,912 INFO L82 PathProgramCache]: Analyzing trace with hash -503945167, now seen corresponding path program 795 times [2021-05-22 02:30:54,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:54,912 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [653118365] [2021-05-22 02:30:54,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:54,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:55,004 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:55,004 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:55,004 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [653118365] [2021-05-22 02:30:55,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [653118365] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:55,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [755859381] [2021-05-22 02:30:55,005 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 796 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 796 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:55,030 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:30:55,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:55,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:55,031 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:55,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:55,066 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:55,068 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:55,078 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:55,078 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:55,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:55,115 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,125 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:55,125 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:30:55,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:55,128 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,136 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:55,136 INFO L518 ElimStorePlain]: Eliminatee v_prenex_237 vanished before elimination [2021-05-22 02:30:55,137 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:55,137 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:30:55,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:55,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [755859381] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:55,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:55,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:55,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204923812] [2021-05-22 02:30:55,211 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:55,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:55,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:55,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:55,211 INFO L87 Difference]: Start difference. First operand 497 states and 1572 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:55,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:55,501 INFO L93 Difference]: Finished difference Result 803 states and 2476 transitions. [2021-05-22 02:30:55,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:30:55,501 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:55,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:55,502 INFO L225 Difference]: With dead ends: 803 [2021-05-22 02:30:55,502 INFO L226 Difference]: Without dead ends: 776 [2021-05-22 02:30:55,502 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 265.8ms TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:30:55,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 776 states. [2021-05-22 02:30:55,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 776 to 503. [2021-05-22 02:30:55,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.1673306772908365) internal successors, (1590), 502 states have internal predecessors, (1590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:55,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1590 transitions. [2021-05-22 02:30:55,508 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1590 transitions. Word has length 21 [2021-05-22 02:30:55,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:55,508 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1590 transitions. [2021-05-22 02:30:55,508 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:55,508 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1590 transitions. [2021-05-22 02:30:55,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:55,508 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:55,509 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:55,709 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 796 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4484 [2021-05-22 02:30:55,709 INFO L430 AbstractCegarLoop]: === Iteration 808 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:55,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:55,709 INFO L82 PathProgramCache]: Analyzing trace with hash 1830275163, now seen corresponding path program 796 times [2021-05-22 02:30:55,709 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:55,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [957248824] [2021-05-22 02:30:55,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:55,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:55,781 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:55,781 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:55,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [957248824] [2021-05-22 02:30:55,781 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [957248824] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:55,781 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661943733] [2021-05-22 02:30:55,781 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 797 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 797 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:55,805 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:55,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:55,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:55,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:55,845 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:55,846 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,847 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:55,848 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,856 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:55,857 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:55,857 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:55,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:55,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,896 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:55,896 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:30:55,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:55,896 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:30:55,911 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:55,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661943733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:55,911 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:55,911 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:30:55,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [777886893] [2021-05-22 02:30:55,912 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:30:55,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:55,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:30:55,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:30:55,912 INFO L87 Difference]: Start difference. First operand 503 states and 1590 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:56,074 INFO L93 Difference]: Finished difference Result 613 states and 1895 transitions. [2021-05-22 02:30:56,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:56,074 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:56,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:56,075 INFO L225 Difference]: With dead ends: 613 [2021-05-22 02:30:56,075 INFO L226 Difference]: Without dead ends: 594 [2021-05-22 02:30:56,075 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 139.0ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:56,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-05-22 02:30:56,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 487. [2021-05-22 02:30:56,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1604938271604937) internal successors, (1536), 486 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1536 transitions. [2021-05-22 02:30:56,081 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1536 transitions. Word has length 21 [2021-05-22 02:30:56,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:56,081 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1536 transitions. [2021-05-22 02:30:56,081 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,081 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1536 transitions. [2021-05-22 02:30:56,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:56,081 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:56,081 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:56,282 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 797 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4495 [2021-05-22 02:30:56,282 INFO L430 AbstractCegarLoop]: === Iteration 809 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:56,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:56,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1919319479, now seen corresponding path program 797 times [2021-05-22 02:30:56,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:56,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1836240222] [2021-05-22 02:30:56,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:56,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:56,364 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:56,364 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:56,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1836240222] [2021-05-22 02:30:56,365 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1836240222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:56,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [145649061] [2021-05-22 02:30:56,365 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 798 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 798 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:56,390 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:30:56,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:56,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:56,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:56,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:56,425 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:56,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:56,427 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:56,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:56,437 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:30:56,437 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:30:56,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:56,496 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:56,498 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:56,499 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:30:56,499 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:56,499 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:30:56,509 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:56,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [145649061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:56,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:56,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:56,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418920611] [2021-05-22 02:30:56,509 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:56,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:56,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:56,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:56,509 INFO L87 Difference]: Start difference. First operand 487 states and 1536 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:56,700 INFO L93 Difference]: Finished difference Result 646 states and 1989 transitions. [2021-05-22 02:30:56,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:56,701 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:56,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:56,702 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:30:56,702 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:30:56,702 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 182.2ms TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:56,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:30:56,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 487. [2021-05-22 02:30:56,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.168724279835391) internal successors, (1540), 486 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1540 transitions. [2021-05-22 02:30:56,707 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1540 transitions. Word has length 21 [2021-05-22 02:30:56,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:56,707 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1540 transitions. [2021-05-22 02:30:56,707 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:56,707 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1540 transitions. [2021-05-22 02:30:56,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:56,707 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:56,707 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:56,908 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4498,798 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:56,908 INFO L430 AbstractCegarLoop]: === Iteration 810 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:56,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:56,908 INFO L82 PathProgramCache]: Analyzing trace with hash 656663135, now seen corresponding path program 798 times [2021-05-22 02:30:56,908 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:56,908 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239196363] [2021-05-22 02:30:56,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:56,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:56,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:56,992 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:56,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239196363] [2021-05-22 02:30:56,992 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239196363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:56,992 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990636625] [2021-05-22 02:30:56,992 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 799 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 799 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:57,017 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:30:57,017 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:57,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:57,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:57,100 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_238], 1=[o_2]} [2021-05-22 02:30:57,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:30:57,103 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,119 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:57,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:57,120 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,133 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:30:57,133 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:30:57,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:57,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:57,188 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,197 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:57,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:57,198 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,205 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,205 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:30:57,220 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:57,220 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990636625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:57,220 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:57,220 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:57,220 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576553037] [2021-05-22 02:30:57,220 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:57,221 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:57,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:57,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:57,221 INFO L87 Difference]: Start difference. First operand 487 states and 1540 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:57,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:57,494 INFO L93 Difference]: Finished difference Result 646 states and 1989 transitions. [2021-05-22 02:30:57,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:57,495 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:57,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:57,496 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:30:57,496 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:30:57,496 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 250.6ms TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:57,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:30:57,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 483. [2021-05-22 02:30:57,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 483 states, 482 states have (on average 3.159751037344398) internal successors, (1523), 482 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:57,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 483 states to 483 states and 1523 transitions. [2021-05-22 02:30:57,501 INFO L78 Accepts]: Start accepts. Automaton has 483 states and 1523 transitions. Word has length 21 [2021-05-22 02:30:57,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:57,501 INFO L482 AbstractCegarLoop]: Abstraction has 483 states and 1523 transitions. [2021-05-22 02:30:57,501 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:57,501 INFO L276 IsEmpty]: Start isEmpty. Operand 483 states and 1523 transitions. [2021-05-22 02:30:57,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:57,502 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:57,502 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:57,702 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 799 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4504 [2021-05-22 02:30:57,702 INFO L430 AbstractCegarLoop]: === Iteration 811 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:57,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:57,702 INFO L82 PathProgramCache]: Analyzing trace with hash 2053050313, now seen corresponding path program 799 times [2021-05-22 02:30:57,702 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:57,702 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279278275] [2021-05-22 02:30:57,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:57,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:57,790 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:57,790 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:57,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279278275] [2021-05-22 02:30:57,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279278275] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:57,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097520482] [2021-05-22 02:30:57,790 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 800 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 800 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:57,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:57,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:57,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:57,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:57,859 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,863 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,863 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,863 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:30:57,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:57,891 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:57,894 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:57,894 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:57,894 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:30:57,921 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:57,921 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097520482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:57,921 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:57,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:30:57,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982711183] [2021-05-22 02:30:57,922 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:30:57,922 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:57,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:30:57,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:30:57,922 INFO L87 Difference]: Start difference. First operand 483 states and 1523 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:58,082 INFO L93 Difference]: Finished difference Result 760 states and 2346 transitions. [2021-05-22 02:30:58,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:58,082 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:58,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:58,083 INFO L225 Difference]: With dead ends: 760 [2021-05-22 02:30:58,083 INFO L226 Difference]: Without dead ends: 739 [2021-05-22 02:30:58,083 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 170.5ms TimeCoverageRelationStatistics Valid=68, Invalid=312, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:30:58,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2021-05-22 02:30:58,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 489. [2021-05-22 02:30:58,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1639344262295084) internal successors, (1544), 488 states have internal predecessors, (1544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1544 transitions. [2021-05-22 02:30:58,089 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1544 transitions. Word has length 21 [2021-05-22 02:30:58,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:58,089 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1544 transitions. [2021-05-22 02:30:58,089 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,089 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1544 transitions. [2021-05-22 02:30:58,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:58,090 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:58,090 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:58,290 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4509,800 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:58,290 INFO L430 AbstractCegarLoop]: === Iteration 812 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:58,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:58,291 INFO L82 PathProgramCache]: Analyzing trace with hash 723122151, now seen corresponding path program 800 times [2021-05-22 02:30:58,291 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:58,291 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [473558318] [2021-05-22 02:30:58,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:58,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:58,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:58,374 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:58,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [473558318] [2021-05-22 02:30:58,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [473558318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:58,374 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213416505] [2021-05-22 02:30:58,374 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 801 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 801 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:58,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:30:58,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:58,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:58,400 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:58,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:58,461 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:58,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:58,468 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:58,468 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:30:58,491 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:58,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:58,492 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:58,499 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:58,500 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:58,501 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:58,501 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:58,507 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:58,507 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:58,508 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:30:58,522 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:58,522 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213416505] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:58,522 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:58,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:30:58,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217851592] [2021-05-22 02:30:58,523 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:30:58,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:58,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:30:58,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:58,523 INFO L87 Difference]: Start difference. First operand 489 states and 1544 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:58,688 INFO L93 Difference]: Finished difference Result 633 states and 1959 transitions. [2021-05-22 02:30:58,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:30:58,689 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:58,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:58,690 INFO L225 Difference]: With dead ends: 633 [2021-05-22 02:30:58,690 INFO L226 Difference]: Without dead ends: 612 [2021-05-22 02:30:58,690 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 131.9ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:30:58,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2021-05-22 02:30:58,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 486. [2021-05-22 02:30:58,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.158762886597938) internal successors, (1532), 485 states have internal predecessors, (1532), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1532 transitions. [2021-05-22 02:30:58,695 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1532 transitions. Word has length 21 [2021-05-22 02:30:58,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:58,695 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1532 transitions. [2021-05-22 02:30:58,695 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:58,695 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1532 transitions. [2021-05-22 02:30:58,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:58,696 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:58,696 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:58,896 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4511,801 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:58,896 INFO L430 AbstractCegarLoop]: === Iteration 813 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:58,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:58,897 INFO L82 PathProgramCache]: Analyzing trace with hash -191959337, now seen corresponding path program 801 times [2021-05-22 02:30:58,897 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:58,897 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859659002] [2021-05-22 02:30:58,897 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:58,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:58,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:58,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:58,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859659002] [2021-05-22 02:30:58,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859659002] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:58,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1592923245] [2021-05-22 02:30:58,984 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 802 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 802 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:59,009 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:30:59,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:59,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:59,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:59,108 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:59,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:59,109 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:59,116 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:30:59,116 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:30:59,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:59,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:59,142 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:59,152 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:30:59,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:30:59,152 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,159 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:59,160 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,160 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:30:59,205 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:59,205 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1592923245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:59,205 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:59,205 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:30:59,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22286300] [2021-05-22 02:30:59,205 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:30:59,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:59,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:30:59,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:30:59,206 INFO L87 Difference]: Start difference. First operand 486 states and 1532 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:59,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:30:59,465 INFO L93 Difference]: Finished difference Result 768 states and 2368 transitions. [2021-05-22 02:30:59,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:30:59,465 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:30:59,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:30:59,466 INFO L225 Difference]: With dead ends: 768 [2021-05-22 02:30:59,466 INFO L226 Difference]: Without dead ends: 747 [2021-05-22 02:30:59,466 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 262.1ms TimeCoverageRelationStatistics Valid=85, Invalid=377, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:30:59,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 747 states. [2021-05-22 02:30:59,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 747 to 482. [2021-05-22 02:30:59,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.158004158004158) internal successors, (1519), 481 states have internal predecessors, (1519), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:59,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1519 transitions. [2021-05-22 02:30:59,472 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1519 transitions. Word has length 21 [2021-05-22 02:30:59,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:30:59,472 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1519 transitions. [2021-05-22 02:30:59,472 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:30:59,472 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1519 transitions. [2021-05-22 02:30:59,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:30:59,473 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:30:59,473 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:30:59,673 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4513,802 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:59,673 INFO L430 AbstractCegarLoop]: === Iteration 814 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:30:59,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:30:59,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1400915743, now seen corresponding path program 802 times [2021-05-22 02:30:59,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:30:59,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205800900] [2021-05-22 02:30:59,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:30:59,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:30:59,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:59,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:30:59,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205800900] [2021-05-22 02:30:59,744 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205800900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:59,744 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [993853697] [2021-05-22 02:30:59,744 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 803 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 803 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:30:59,773 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:30:59,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:30:59,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:30:59,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:30:59,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:30:59,794 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,796 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:59,797 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,797 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:30:59,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:30:59,831 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,834 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:30:59,834 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:30:59,834 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:30:59,834 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:30:59,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:30:59,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [993853697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:30:59,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:30:59,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:30:59,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631695915] [2021-05-22 02:30:59,860 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:30:59,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:30:59,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:30:59,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:30:59,860 INFO L87 Difference]: Start difference. First operand 482 states and 1519 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:00,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:00,410 INFO L93 Difference]: Finished difference Result 916 states and 2778 transitions. [2021-05-22 02:31:00,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:31:00,410 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:00,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:00,411 INFO L225 Difference]: With dead ends: 916 [2021-05-22 02:31:00,411 INFO L226 Difference]: Without dead ends: 895 [2021-05-22 02:31:00,412 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 431.4ms TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2021-05-22 02:31:00,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 895 states. [2021-05-22 02:31:00,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 895 to 480. [2021-05-22 02:31:00,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.1419624217119) internal successors, (1505), 479 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:00,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1505 transitions. [2021-05-22 02:31:00,418 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1505 transitions. Word has length 21 [2021-05-22 02:31:00,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:00,418 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1505 transitions. [2021-05-22 02:31:00,418 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:00,418 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1505 transitions. [2021-05-22 02:31:00,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:00,418 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:00,419 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:00,619 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 803 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4516 [2021-05-22 02:31:00,619 INFO L430 AbstractCegarLoop]: === Iteration 815 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:00,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:00,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1283658241, now seen corresponding path program 803 times [2021-05-22 02:31:00,619 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:00,619 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665375389] [2021-05-22 02:31:00,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:00,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:00,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:00,700 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:00,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665375389] [2021-05-22 02:31:00,700 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665375389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:00,700 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42674585] [2021-05-22 02:31:00,700 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 804 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 804 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:00,726 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:31:00,726 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:00,727 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:31:00,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:00,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:00,795 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:00,798 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:00,799 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:00,799 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:31:00,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:00,816 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:00,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:00,818 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:00,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:00,833 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:00,833 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:00,833 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:31:00,906 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:00,906 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [42674585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:00,906 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:00,906 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:31:00,906 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622102668] [2021-05-22 02:31:00,907 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:31:00,907 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:00,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:31:00,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:31:00,907 INFO L87 Difference]: Start difference. First operand 480 states and 1505 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:01,175 INFO L93 Difference]: Finished difference Result 770 states and 2358 transitions. [2021-05-22 02:31:01,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:31:01,176 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:01,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:01,177 INFO L225 Difference]: With dead ends: 770 [2021-05-22 02:31:01,177 INFO L226 Difference]: Without dead ends: 749 [2021-05-22 02:31:01,177 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 272.4ms TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:31:01,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 749 states. [2021-05-22 02:31:01,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 749 to 459. [2021-05-22 02:31:01,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.12882096069869) internal successors, (1433), 458 states have internal predecessors, (1433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1433 transitions. [2021-05-22 02:31:01,182 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1433 transitions. Word has length 21 [2021-05-22 02:31:01,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:01,182 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1433 transitions. [2021-05-22 02:31:01,182 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,182 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1433 transitions. [2021-05-22 02:31:01,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:01,183 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:01,183 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:01,383 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4518,804 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:01,383 INFO L430 AbstractCegarLoop]: === Iteration 816 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:01,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:01,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1900494295, now seen corresponding path program 804 times [2021-05-22 02:31:01,383 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:01,384 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [531668842] [2021-05-22 02:31:01,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:01,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:01,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:01,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:01,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [531668842] [2021-05-22 02:31:01,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [531668842] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:01,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1948173565] [2021-05-22 02:31:01,454 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 805 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 805 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:01,480 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:01,480 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:01,481 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:01,481 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:01,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:01,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:01,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:01,525 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:01,525 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:31:01,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:01,554 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:01,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:01,557 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:01,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:01,557 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:31:01,565 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:01,565 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1948173565] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:01,565 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:01,565 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:01,565 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753069333] [2021-05-22 02:31:01,565 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:01,565 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:01,565 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:01,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:01,566 INFO L87 Difference]: Start difference. First operand 459 states and 1433 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:01,667 INFO L93 Difference]: Finished difference Result 605 states and 1861 transitions. [2021-05-22 02:31:01,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:01,667 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:01,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:01,668 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:31:01,668 INFO L226 Difference]: Without dead ends: 583 [2021-05-22 02:31:01,668 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 110.2ms TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:01,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-05-22 02:31:01,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 465. [2021-05-22 02:31:01,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1336206896551726) internal successors, (1454), 464 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1454 transitions. [2021-05-22 02:31:01,673 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1454 transitions. Word has length 21 [2021-05-22 02:31:01,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:01,673 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1454 transitions. [2021-05-22 02:31:01,673 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:01,673 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1454 transitions. [2021-05-22 02:31:01,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:01,673 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:01,673 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:01,873 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 805 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4524 [2021-05-22 02:31:01,874 INFO L430 AbstractCegarLoop]: === Iteration 817 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:01,874 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:01,874 INFO L82 PathProgramCache]: Analyzing trace with hash 1398702959, now seen corresponding path program 805 times [2021-05-22 02:31:01,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:01,874 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1182203841] [2021-05-22 02:31:01,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:01,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:01,946 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:01,946 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:01,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1182203841] [2021-05-22 02:31:01,946 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1182203841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:01,946 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536824272] [2021-05-22 02:31:01,946 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 806 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 806 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:01,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:01,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:01,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:02,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:02,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,016 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,016 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,016 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:31:02,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:02,032 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,035 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:02,035 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,035 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:02,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:02,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536824272] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:02,049 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:02,049 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:31:02,049 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1722503684] [2021-05-22 02:31:02,049 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:31:02,049 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:02,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:31:02,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:31:02,049 INFO L87 Difference]: Start difference. First operand 465 states and 1454 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:02,172 INFO L93 Difference]: Finished difference Result 614 states and 1885 transitions. [2021-05-22 02:31:02,172 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:02,172 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:02,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:02,173 INFO L225 Difference]: With dead ends: 614 [2021-05-22 02:31:02,173 INFO L226 Difference]: Without dead ends: 592 [2021-05-22 02:31:02,173 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 104.0ms TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:02,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2021-05-22 02:31:02,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 462. [2021-05-22 02:31:02,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1279826464208242) internal successors, (1442), 461 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1442 transitions. [2021-05-22 02:31:02,178 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1442 transitions. Word has length 21 [2021-05-22 02:31:02,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:02,178 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1442 transitions. [2021-05-22 02:31:02,178 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,178 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1442 transitions. [2021-05-22 02:31:02,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:02,178 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:02,178 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:02,379 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4526,806 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:02,379 INFO L430 AbstractCegarLoop]: === Iteration 818 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:02,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:02,379 INFO L82 PathProgramCache]: Analyzing trace with hash -708081161, now seen corresponding path program 806 times [2021-05-22 02:31:02,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:02,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495633248] [2021-05-22 02:31:02,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:02,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:02,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:02,451 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:02,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495633248] [2021-05-22 02:31:02,451 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495633248] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:02,451 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [441471831] [2021-05-22 02:31:02,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 807 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 807 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:02,476 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:02,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:02,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:02,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:02,516 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:02,517 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,521 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,521 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,521 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:31:02,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:02,531 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,534 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,534 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:02,534 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,535 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:02,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:02,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [441471831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:02,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:02,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:31:02,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1678699007] [2021-05-22 02:31:02,548 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:31:02,548 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:02,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:31:02,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:31:02,548 INFO L87 Difference]: Start difference. First operand 462 states and 1442 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:02,638 INFO L93 Difference]: Finished difference Result 602 states and 1852 transitions. [2021-05-22 02:31:02,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:02,638 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:02,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:02,639 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:31:02,639 INFO L226 Difference]: Without dead ends: 580 [2021-05-22 02:31:02,639 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 89.2ms TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:31:02,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2021-05-22 02:31:02,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 459. [2021-05-22 02:31:02,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.12882096069869) internal successors, (1433), 458 states have internal predecessors, (1433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1433 transitions. [2021-05-22 02:31:02,644 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1433 transitions. Word has length 21 [2021-05-22 02:31:02,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:02,644 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1433 transitions. [2021-05-22 02:31:02,644 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:02,644 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1433 transitions. [2021-05-22 02:31:02,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:02,644 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:02,644 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:02,845 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 807 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4528 [2021-05-22 02:31:02,845 INFO L430 AbstractCegarLoop]: === Iteration 819 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:02,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:02,845 INFO L82 PathProgramCache]: Analyzing trace with hash 332154637, now seen corresponding path program 807 times [2021-05-22 02:31:02,845 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:02,845 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1808339915] [2021-05-22 02:31:02,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:02,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:02,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:02,919 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:02,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1808339915] [2021-05-22 02:31:02,920 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1808339915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:02,920 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279598551] [2021-05-22 02:31:02,920 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 808 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 808 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:02,945 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:31:02,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:02,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:02,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:02,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:02,981 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,984 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,984 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,984 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:31:02,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:02,995 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,999 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:02,999 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:02,999 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:02,999 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:03,012 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:03,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279598551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:03,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:03,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:31:03,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194583468] [2021-05-22 02:31:03,012 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:31:03,012 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:03,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:31:03,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:31:03,013 INFO L87 Difference]: Start difference. First operand 459 states and 1433 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:03,128 INFO L93 Difference]: Finished difference Result 680 states and 2080 transitions. [2021-05-22 02:31:03,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:03,129 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:03,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:03,129 INFO L225 Difference]: With dead ends: 680 [2021-05-22 02:31:03,129 INFO L226 Difference]: Without dead ends: 658 [2021-05-22 02:31:03,129 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 89.4ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:31:03,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 658 states. [2021-05-22 02:31:03,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 658 to 456. [2021-05-22 02:31:03,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1296703296703297) internal successors, (1424), 455 states have internal predecessors, (1424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1424 transitions. [2021-05-22 02:31:03,134 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1424 transitions. Word has length 21 [2021-05-22 02:31:03,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:03,134 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1424 transitions. [2021-05-22 02:31:03,134 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,135 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1424 transitions. [2021-05-22 02:31:03,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:03,135 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:03,135 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:03,335 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 808 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4530 [2021-05-22 02:31:03,336 INFO L430 AbstractCegarLoop]: === Iteration 820 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:03,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:03,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1964035979, now seen corresponding path program 808 times [2021-05-22 02:31:03,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:03,336 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [3607101] [2021-05-22 02:31:03,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:03,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:03,428 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:03,428 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:03,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [3607101] [2021-05-22 02:31:03,428 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [3607101] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:03,428 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1228031910] [2021-05-22 02:31:03,428 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 809 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 809 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:03,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:03,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:03,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:03,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:03,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:03,516 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:03,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:03,518 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:03,527 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:03,528 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:03,528 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:45, output treesize:29 [2021-05-22 02:31:03,572 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:03,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:03,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:03,578 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:03,580 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:03,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:03,580 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:03,585 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:03,585 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:03,585 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:32, output treesize:7 [2021-05-22 02:31:03,612 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:03,612 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1228031910] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:03,612 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:03,612 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:03,612 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280915374] [2021-05-22 02:31:03,613 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:03,613 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:03,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:03,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:03,613 INFO L87 Difference]: Start difference. First operand 456 states and 1424 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:03,927 INFO L93 Difference]: Finished difference Result 696 states and 2138 transitions. [2021-05-22 02:31:03,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:03,927 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:03,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:03,928 INFO L225 Difference]: With dead ends: 696 [2021-05-22 02:31:03,928 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:31:03,929 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 286.4ms TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:31:03,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:31:03,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 468. [2021-05-22 02:31:03,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.139186295503212) internal successors, (1466), 467 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1466 transitions. [2021-05-22 02:31:03,934 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1466 transitions. Word has length 21 [2021-05-22 02:31:03,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:03,934 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1466 transitions. [2021-05-22 02:31:03,934 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:03,934 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1466 transitions. [2021-05-22 02:31:03,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:03,934 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:03,934 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:04,135 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4532,809 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:04,135 INFO L430 AbstractCegarLoop]: === Iteration 821 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:04,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:04,135 INFO L82 PathProgramCache]: Analyzing trace with hash 1741827367, now seen corresponding path program 809 times [2021-05-22 02:31:04,135 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:04,135 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [804211724] [2021-05-22 02:31:04,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:04,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:04,208 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:04,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [804211724] [2021-05-22 02:31:04,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [804211724] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:04,208 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760836604] [2021-05-22 02:31:04,208 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 810 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 810 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:04,234 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:04,234 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:04,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:04,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:04,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:04,289 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:04,294 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:04,294 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:04,294 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:30, output treesize:23 [2021-05-22 02:31:04,350 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:04,350 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:04,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:04,351 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:04,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:04,354 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:04,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:04,360 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:04,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:04,361 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:04,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:04,367 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:04,367 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:41, output treesize:5 [2021-05-22 02:31:04,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:04,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760836604] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:04,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:04,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:04,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949429015] [2021-05-22 02:31:04,392 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:04,392 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:04,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:04,393 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:04,393 INFO L87 Difference]: Start difference. First operand 468 states and 1466 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:05,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:05,168 INFO L93 Difference]: Finished difference Result 992 states and 2992 transitions. [2021-05-22 02:31:05,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-05-22 02:31:05,168 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:05,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:05,169 INFO L225 Difference]: With dead ends: 992 [2021-05-22 02:31:05,170 INFO L226 Difference]: Without dead ends: 932 [2021-05-22 02:31:05,170 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 332 ImplicationChecksByTransitivity, 566.6ms TimeCoverageRelationStatistics Valid=239, Invalid=1093, Unknown=0, NotChecked=0, Total=1332 [2021-05-22 02:31:05,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 932 states. [2021-05-22 02:31:05,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 932 to 476. [2021-05-22 02:31:05,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.134736842105263) internal successors, (1489), 475 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:05,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1489 transitions. [2021-05-22 02:31:05,176 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1489 transitions. Word has length 21 [2021-05-22 02:31:05,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:05,176 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1489 transitions. [2021-05-22 02:31:05,176 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:05,176 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1489 transitions. [2021-05-22 02:31:05,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:05,177 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:05,177 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:05,377 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4535,810 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:05,377 INFO L430 AbstractCegarLoop]: === Iteration 822 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:05,377 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:05,377 INFO L82 PathProgramCache]: Analyzing trace with hash -644539477, now seen corresponding path program 810 times [2021-05-22 02:31:05,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:05,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [155770454] [2021-05-22 02:31:05,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:05,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:05,465 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:05,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [155770454] [2021-05-22 02:31:05,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [155770454] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:05,465 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025861939] [2021-05-22 02:31:05,465 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 811 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 811 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:05,492 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:05,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:05,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:05,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:05,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:05,552 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:05,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:05,554 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:05,562 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:05,563 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:05,563 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:45, output treesize:29 [2021-05-22 02:31:05,593 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:05,593 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:05,593 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:05,594 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:05,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:05,597 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:05,609 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:05,611 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:05,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:05,612 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:05,623 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:05,624 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:05,624 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:57, output treesize:13 [2021-05-22 02:31:05,669 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:05,670 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025861939] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:05,670 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:05,670 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:05,670 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [267783345] [2021-05-22 02:31:05,670 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:05,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:05,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:05,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:05,670 INFO L87 Difference]: Start difference. First operand 476 states and 1489 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:06,057 INFO L93 Difference]: Finished difference Result 785 states and 2415 transitions. [2021-05-22 02:31:06,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:06,058 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:06,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:06,059 INFO L225 Difference]: With dead ends: 785 [2021-05-22 02:31:06,059 INFO L226 Difference]: Without dead ends: 762 [2021-05-22 02:31:06,059 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 318.0ms TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:31:06,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-05-22 02:31:06,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 474. [2021-05-22 02:31:06,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1374207188160677) internal successors, (1484), 473 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1484 transitions. [2021-05-22 02:31:06,064 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1484 transitions. Word has length 21 [2021-05-22 02:31:06,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:06,064 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1484 transitions. [2021-05-22 02:31:06,064 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,064 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1484 transitions. [2021-05-22 02:31:06,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:06,065 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:06,065 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:06,265 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 811 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4541 [2021-05-22 02:31:06,265 INFO L430 AbstractCegarLoop]: === Iteration 823 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:06,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:06,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1530337757, now seen corresponding path program 811 times [2021-05-22 02:31:06,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:06,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889492368] [2021-05-22 02:31:06,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:06,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:06,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:06,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:06,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889492368] [2021-05-22 02:31:06,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889492368] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:06,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2096996162] [2021-05-22 02:31:06,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 812 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 812 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:06,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:06,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:06,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:06,432 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:06,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:06,433 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:06,439 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:06,440 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:06,440 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:35, output treesize:28 [2021-05-22 02:31:06,469 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:31:06,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:06,472 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:06,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:06,475 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:06,487 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:06,489 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:06,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:06,489 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:06,501 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:06,502 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:06,502 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:13 [2021-05-22 02:31:06,548 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:06,548 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2096996162] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:06,548 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:06,548 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:06,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743150982] [2021-05-22 02:31:06,548 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:06,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:06,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:06,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:06,549 INFO L87 Difference]: Start difference. First operand 474 states and 1484 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:06,849 INFO L93 Difference]: Finished difference Result 784 states and 2409 transitions. [2021-05-22 02:31:06,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:06,849 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:06,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:06,850 INFO L225 Difference]: With dead ends: 784 [2021-05-22 02:31:06,850 INFO L226 Difference]: Without dead ends: 757 [2021-05-22 02:31:06,851 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 233.7ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:06,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 757 states. [2021-05-22 02:31:06,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 757 to 474. [2021-05-22 02:31:06,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1374207188160677) internal successors, (1484), 473 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1484 transitions. [2021-05-22 02:31:06,856 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1484 transitions. Word has length 21 [2021-05-22 02:31:06,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:06,856 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1484 transitions. [2021-05-22 02:31:06,856 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:06,856 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1484 transitions. [2021-05-22 02:31:06,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:06,857 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:06,857 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:07,057 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 812 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4546 [2021-05-22 02:31:07,057 INFO L430 AbstractCegarLoop]: === Iteration 824 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:07,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:07,057 INFO L82 PathProgramCache]: Analyzing trace with hash -1814600441, now seen corresponding path program 812 times [2021-05-22 02:31:07,057 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:07,057 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834251664] [2021-05-22 02:31:07,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:07,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:07,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:07,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:07,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834251664] [2021-05-22 02:31:07,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834251664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:07,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [991439027] [2021-05-22 02:31:07,134 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 813 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 813 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:07,160 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:07,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:07,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:07,161 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:07,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:07,240 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:07,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:07,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:07,243 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:07,251 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:07,252 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:07,252 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:31:07,284 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_239, o_0, v_prenex_240], 1=[o_2]} [2021-05-22 02:31:07,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:07,287 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:07,296 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:07,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:07,299 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:07,308 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:07,308 INFO L518 ElimStorePlain]: Eliminatee v_prenex_240 vanished before elimination [2021-05-22 02:31:07,309 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:07,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:07,310 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:07,318 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:07,319 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:07,319 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:31:07,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:07,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [991439027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:07,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:07,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:07,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664899932] [2021-05-22 02:31:07,375 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:07,375 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:07,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:07,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:07,375 INFO L87 Difference]: Start difference. First operand 474 states and 1484 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:08,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:08,000 INFO L93 Difference]: Finished difference Result 963 states and 2928 transitions. [2021-05-22 02:31:08,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-22 02:31:08,000 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:08,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:08,002 INFO L225 Difference]: With dead ends: 963 [2021-05-22 02:31:08,002 INFO L226 Difference]: Without dead ends: 936 [2021-05-22 02:31:08,002 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 448.8ms TimeCoverageRelationStatistics Valid=172, Invalid=820, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:31:08,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2021-05-22 02:31:08,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 488. [2021-05-22 02:31:08,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.131416837782341) internal successors, (1525), 487 states have internal predecessors, (1525), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:08,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1525 transitions. [2021-05-22 02:31:08,008 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1525 transitions. Word has length 21 [2021-05-22 02:31:08,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:08,008 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1525 transitions. [2021-05-22 02:31:08,008 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:08,008 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1525 transitions. [2021-05-22 02:31:08,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:08,009 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:08,009 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:08,209 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 813 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4550 [2021-05-22 02:31:08,209 INFO L430 AbstractCegarLoop]: === Iteration 825 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:08,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:08,210 INFO L82 PathProgramCache]: Analyzing trace with hash -128208601, now seen corresponding path program 813 times [2021-05-22 02:31:08,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:08,210 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983981698] [2021-05-22 02:31:08,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:08,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:08,308 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:08,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:08,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983981698] [2021-05-22 02:31:08,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [983981698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:08,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1773746294] [2021-05-22 02:31:08,308 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 814 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 814 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:08,340 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:31:08,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:08,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:08,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:08,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:08,435 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:08,436 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:08,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:08,437 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:08,445 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:08,446 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:08,446 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:27 [2021-05-22 02:31:08,490 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:31:08,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:08,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:08,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:08,499 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:08,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:08,500 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:08,504 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:08,505 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:08,505 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:31:08,533 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:08,534 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1773746294] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:08,534 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:08,534 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:08,534 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924942412] [2021-05-22 02:31:08,534 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:08,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:08,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:08,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:08,534 INFO L87 Difference]: Start difference. First operand 488 states and 1525 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:09,004 INFO L93 Difference]: Finished difference Result 829 states and 2543 transitions. [2021-05-22 02:31:09,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:31:09,004 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:09,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:09,005 INFO L225 Difference]: With dead ends: 829 [2021-05-22 02:31:09,005 INFO L226 Difference]: Without dead ends: 808 [2021-05-22 02:31:09,005 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 412.8ms TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:31:09,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2021-05-22 02:31:09,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 470. [2021-05-22 02:31:09,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.142857142857143) internal successors, (1474), 469 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1474 transitions. [2021-05-22 02:31:09,011 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1474 transitions. Word has length 21 [2021-05-22 02:31:09,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:09,011 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1474 transitions. [2021-05-22 02:31:09,011 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,011 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1474 transitions. [2021-05-22 02:31:09,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:09,011 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:09,011 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:09,211 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 814 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4562 [2021-05-22 02:31:09,212 INFO L430 AbstractCegarLoop]: === Iteration 826 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:09,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:09,212 INFO L82 PathProgramCache]: Analyzing trace with hash 652200909, now seen corresponding path program 814 times [2021-05-22 02:31:09,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:09,212 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626532796] [2021-05-22 02:31:09,212 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:09,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:09,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:09,296 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:09,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626532796] [2021-05-22 02:31:09,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626532796] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:09,296 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [632800557] [2021-05-22 02:31:09,296 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 815 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 815 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:09,323 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:09,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:09,323 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:09,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:09,368 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:09,368 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:09,369 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:09,374 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:09,375 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:09,375 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:32, output treesize:25 [2021-05-22 02:31:09,423 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:31:09,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:09,427 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:09,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:09,429 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:09,442 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:09,444 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:09,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:09,445 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:09,456 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:09,457 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:09,457 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:13 [2021-05-22 02:31:09,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:09,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [632800557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:09,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:09,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:09,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44488816] [2021-05-22 02:31:09,504 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:09,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:09,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:09,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:09,505 INFO L87 Difference]: Start difference. First operand 470 states and 1474 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:09,903 INFO L93 Difference]: Finished difference Result 855 states and 2616 transitions. [2021-05-22 02:31:09,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:31:09,903 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:09,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:09,904 INFO L225 Difference]: With dead ends: 855 [2021-05-22 02:31:09,904 INFO L226 Difference]: Without dead ends: 824 [2021-05-22 02:31:09,905 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 113 ImplicationChecksByTransitivity, 307.1ms TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:31:09,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 824 states. [2021-05-22 02:31:09,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 824 to 472. [2021-05-22 02:31:09,910 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.140127388535032) internal successors, (1479), 471 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1479 transitions. [2021-05-22 02:31:09,911 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1479 transitions. Word has length 21 [2021-05-22 02:31:09,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:09,911 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1479 transitions. [2021-05-22 02:31:09,911 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:09,911 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1479 transitions. [2021-05-22 02:31:09,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:09,916 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:09,916 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:10,117 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4569,815 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:10,117 INFO L430 AbstractCegarLoop]: === Iteration 827 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:10,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:10,117 INFO L82 PathProgramCache]: Analyzing trace with hash 367938225, now seen corresponding path program 815 times [2021-05-22 02:31:10,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:10,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [203902198] [2021-05-22 02:31:10,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:10,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:10,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:10,201 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:10,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [203902198] [2021-05-22 02:31:10,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [203902198] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:10,202 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558727333] [2021-05-22 02:31:10,202 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 816 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 816 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:10,228 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:31:10,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:10,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:10,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:10,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:10,285 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:10,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:10,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:10,287 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:10,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:10,293 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:10,293 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:20 [2021-05-22 02:31:10,343 INFO L446 ElimStorePlain]: Different costs {0=[o_0, v_prenex_241, v_prenex_242], 1=[o_2]} [2021-05-22 02:31:10,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:10,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:10,356 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:10,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:10,359 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:10,367 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:10,367 INFO L518 ElimStorePlain]: Eliminatee v_prenex_242 vanished before elimination [2021-05-22 02:31:10,369 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:10,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:10,369 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:10,377 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:10,378 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:10,378 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:45, output treesize:13 [2021-05-22 02:31:10,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:10,426 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558727333] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:10,426 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:10,426 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:10,426 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400080353] [2021-05-22 02:31:10,427 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:10,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:10,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:10,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:10,427 INFO L87 Difference]: Start difference. First operand 472 states and 1479 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:11,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:11,290 INFO L93 Difference]: Finished difference Result 1099 states and 3357 transitions. [2021-05-22 02:31:11,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:31:11,290 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:11,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:11,292 INFO L225 Difference]: With dead ends: 1099 [2021-05-22 02:31:11,292 INFO L226 Difference]: Without dead ends: 1072 [2021-05-22 02:31:11,292 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 609.9ms TimeCoverageRelationStatistics Valid=225, Invalid=1035, Unknown=0, NotChecked=0, Total=1260 [2021-05-22 02:31:11,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1072 states. [2021-05-22 02:31:11,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1072 to 486. [2021-05-22 02:31:11,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.134020618556701) internal successors, (1520), 485 states have internal predecessors, (1520), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:11,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1520 transitions. [2021-05-22 02:31:11,306 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1520 transitions. Word has length 21 [2021-05-22 02:31:11,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:11,306 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1520 transitions. [2021-05-22 02:31:11,306 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:11,306 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1520 transitions. [2021-05-22 02:31:11,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:11,306 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:11,306 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:11,507 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 816 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4573 [2021-05-22 02:31:11,507 INFO L430 AbstractCegarLoop]: === Iteration 828 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:11,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:11,507 INFO L82 PathProgramCache]: Analyzing trace with hash 2054330065, now seen corresponding path program 816 times [2021-05-22 02:31:11,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:11,507 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1318138452] [2021-05-22 02:31:11,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:11,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:11,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:11,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:11,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1318138452] [2021-05-22 02:31:11,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1318138452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:11,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122111696] [2021-05-22 02:31:11,583 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 817 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 817 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:11,609 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:11,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:11,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:11,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:11,667 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:11,668 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:11,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:11,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:11,671 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:11,676 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:11,677 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:11,677 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:20 [2021-05-22 02:31:11,740 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:31:11,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:11,742 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:11,746 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:11,748 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:11,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:11,749 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:11,753 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:11,754 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:11,754 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:31:11,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:11,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122111696] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:11,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:11,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:11,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590444313] [2021-05-22 02:31:11,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:11,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:11,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:11,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:11,783 INFO L87 Difference]: Start difference. First operand 486 states and 1520 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:12,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:12,314 INFO L93 Difference]: Finished difference Result 970 states and 2980 transitions. [2021-05-22 02:31:12,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:31:12,315 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:12,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:12,316 INFO L225 Difference]: With dead ends: 970 [2021-05-22 02:31:12,316 INFO L226 Difference]: Without dead ends: 949 [2021-05-22 02:31:12,316 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 380.6ms TimeCoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:31:12,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 949 states. [2021-05-22 02:31:12,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 949 to 484. [2021-05-22 02:31:12,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1366459627329193) internal successors, (1515), 483 states have internal predecessors, (1515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:12,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1515 transitions. [2021-05-22 02:31:12,322 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1515 transitions. Word has length 21 [2021-05-22 02:31:12,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:12,322 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1515 transitions. [2021-05-22 02:31:12,322 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:12,322 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1515 transitions. [2021-05-22 02:31:12,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:12,323 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:12,323 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:12,523 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 817 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4585 [2021-05-22 02:31:12,523 INFO L430 AbstractCegarLoop]: === Iteration 829 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:12,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:12,523 INFO L82 PathProgramCache]: Analyzing trace with hash -1200401433, now seen corresponding path program 817 times [2021-05-22 02:31:12,523 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:12,523 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904973609] [2021-05-22 02:31:12,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:12,594 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:12,594 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:12,594 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [904973609] [2021-05-22 02:31:12,595 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [904973609] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:12,595 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2117403584] [2021-05-22 02:31:12,595 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 818 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 818 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:12,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:12,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:12,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:12,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:12,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:12,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:12,679 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:12,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:12,682 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:12,687 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:12,688 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:12,688 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:20 [2021-05-22 02:31:12,745 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[o_2]} [2021-05-22 02:31:12,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:12,747 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:12,752 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:12,754 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:12,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:12,755 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:12,759 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:12,760 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:12,760 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:31:12,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:12,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2117403584] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:12,789 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:12,789 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:12,789 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806463314] [2021-05-22 02:31:12,789 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:12,789 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:12,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:12,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:12,790 INFO L87 Difference]: Start difference. First operand 484 states and 1515 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:13,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:13,544 INFO L93 Difference]: Finished difference Result 1050 states and 3197 transitions. [2021-05-22 02:31:13,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-22 02:31:13,544 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:13,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:13,545 INFO L225 Difference]: With dead ends: 1050 [2021-05-22 02:31:13,545 INFO L226 Difference]: Without dead ends: 1029 [2021-05-22 02:31:13,546 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 229 ImplicationChecksByTransitivity, 492.3ms TimeCoverageRelationStatistics Valid=223, Invalid=833, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:31:13,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1029 states. [2021-05-22 02:31:13,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1029 to 468. [2021-05-22 02:31:13,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.145610278372591) internal successors, (1469), 467 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:13,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1469 transitions. [2021-05-22 02:31:13,552 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1469 transitions. Word has length 21 [2021-05-22 02:31:13,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:13,552 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1469 transitions. [2021-05-22 02:31:13,552 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:13,553 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1469 transitions. [2021-05-22 02:31:13,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:13,553 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:13,553 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:13,753 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 818 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4592 [2021-05-22 02:31:13,753 INFO L430 AbstractCegarLoop]: === Iteration 830 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:13,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:13,754 INFO L82 PathProgramCache]: Analyzing trace with hash -858665853, now seen corresponding path program 818 times [2021-05-22 02:31:13,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:13,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027230201] [2021-05-22 02:31:13,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:13,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:13,833 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:13,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027230201] [2021-05-22 02:31:13,834 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027230201] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:13,834 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287406749] [2021-05-22 02:31:13,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 819 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 819 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:13,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:13,859 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:13,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:13,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:13,905 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:13,906 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:13,909 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:13,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:13,910 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:31:13,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:13,941 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:13,943 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:13,943 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:13,944 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:13,944 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:31:13,952 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:13,952 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287406749] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:13,952 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:13,952 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:13,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295331522] [2021-05-22 02:31:13,952 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:13,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:13,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:13,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:13,952 INFO L87 Difference]: Start difference. First operand 468 states and 1469 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:14,086 INFO L93 Difference]: Finished difference Result 635 states and 1963 transitions. [2021-05-22 02:31:14,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:14,086 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:14,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:14,087 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:31:14,087 INFO L226 Difference]: Without dead ends: 613 [2021-05-22 02:31:14,087 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 129.2ms TimeCoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:14,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 613 states. [2021-05-22 02:31:14,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 613 to 474. [2021-05-22 02:31:14,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1501057082452433) internal successors, (1490), 473 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1490 transitions. [2021-05-22 02:31:14,092 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1490 transitions. Word has length 21 [2021-05-22 02:31:14,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:14,092 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1490 transitions. [2021-05-22 02:31:14,092 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,092 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1490 transitions. [2021-05-22 02:31:14,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:14,093 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:14,093 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:14,293 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 819 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4599 [2021-05-22 02:31:14,293 INFO L430 AbstractCegarLoop]: === Iteration 831 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:14,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:14,294 INFO L82 PathProgramCache]: Analyzing trace with hash -1360457189, now seen corresponding path program 819 times [2021-05-22 02:31:14,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:14,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293794446] [2021-05-22 02:31:14,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:14,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:14,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:14,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:14,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293794446] [2021-05-22 02:31:14,398 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293794446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:14,398 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488870744] [2021-05-22 02:31:14,398 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 820 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 820 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:14,444 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:14,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:14,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:14,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:14,575 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:14,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:14,577 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:14,585 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:14,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:14,587 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:31:14,619 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:14,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:14,620 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:14,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:14,633 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:14,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:14,634 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:14,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:14,644 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:14,644 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:31:14,660 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:14,660 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488870744] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:14,660 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:14,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:14,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295523370] [2021-05-22 02:31:14,661 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:14,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:14,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:14,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:14,661 INFO L87 Difference]: Start difference. First operand 474 states and 1490 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:14,905 INFO L93 Difference]: Finished difference Result 626 states and 1939 transitions. [2021-05-22 02:31:14,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:14,905 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:14,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:14,906 INFO L225 Difference]: With dead ends: 626 [2021-05-22 02:31:14,906 INFO L226 Difference]: Without dead ends: 604 [2021-05-22 02:31:14,906 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 225.0ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:14,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2021-05-22 02:31:14,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 471. [2021-05-22 02:31:14,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1446808510638298) internal successors, (1478), 470 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1478 transitions. [2021-05-22 02:31:14,913 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1478 transitions. Word has length 21 [2021-05-22 02:31:14,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:14,913 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1478 transitions. [2021-05-22 02:31:14,913 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:14,913 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1478 transitions. [2021-05-22 02:31:14,914 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:14,914 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:14,914 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:15,129 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4601,820 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:15,129 INFO L430 AbstractCegarLoop]: === Iteration 832 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:15,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:15,130 INFO L82 PathProgramCache]: Analyzing trace with hash 827725987, now seen corresponding path program 820 times [2021-05-22 02:31:15,130 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:15,130 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090651698] [2021-05-22 02:31:15,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:15,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:15,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:15,242 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:15,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090651698] [2021-05-22 02:31:15,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090651698] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:15,242 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [504498765] [2021-05-22 02:31:15,242 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 821 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 821 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:15,273 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:15,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:15,274 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:15,275 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:15,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:15,357 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:15,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:15,367 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:15,367 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:31:15,397 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:15,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:15,399 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:15,407 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:15,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:15,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:15,411 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:15,418 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:15,419 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:15,419 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:31:15,437 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:15,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [504498765] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:15,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:15,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:15,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868435661] [2021-05-22 02:31:15,437 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:15,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:15,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:15,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:15,438 INFO L87 Difference]: Start difference. First operand 471 states and 1478 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:15,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:15,598 INFO L93 Difference]: Finished difference Result 629 states and 1945 transitions. [2021-05-22 02:31:15,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:15,598 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:15,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:15,599 INFO L225 Difference]: With dead ends: 629 [2021-05-22 02:31:15,599 INFO L226 Difference]: Without dead ends: 607 [2021-05-22 02:31:15,599 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 173.5ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:15,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 607 states. [2021-05-22 02:31:15,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 607 to 468. [2021-05-22 02:31:15,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.145610278372591) internal successors, (1469), 467 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:15,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1469 transitions. [2021-05-22 02:31:15,606 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1469 transitions. Word has length 21 [2021-05-22 02:31:15,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:15,606 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1469 transitions. [2021-05-22 02:31:15,606 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:15,606 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1469 transitions. [2021-05-22 02:31:15,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:15,607 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:15,607 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:15,828 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 821 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4604 [2021-05-22 02:31:15,829 INFO L430 AbstractCegarLoop]: === Iteration 833 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:15,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:15,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1734488267, now seen corresponding path program 821 times [2021-05-22 02:31:15,829 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:15,829 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [597660528] [2021-05-22 02:31:15,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:15,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:15,932 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:15,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:15,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [597660528] [2021-05-22 02:31:15,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [597660528] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:15,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938404872] [2021-05-22 02:31:15,933 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 822 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 822 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:15,965 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:15,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:15,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:15,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:16,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:16,008 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:16,010 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:16,022 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:16,022 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:16,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:16,094 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,097 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:16,097 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:16,098 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,098 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:31:16,108 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:16,108 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938404872] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:16,108 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:16,108 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:16,108 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470040261] [2021-05-22 02:31:16,108 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:16,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:16,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:16,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:16,109 INFO L87 Difference]: Start difference. First operand 468 states and 1469 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:16,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:16,313 INFO L93 Difference]: Finished difference Result 646 states and 1994 transitions. [2021-05-22 02:31:16,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:16,314 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:16,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:16,315 INFO L225 Difference]: With dead ends: 646 [2021-05-22 02:31:16,315 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:31:16,315 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 223.4ms TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:31:16,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:31:16,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 474. [2021-05-22 02:31:16,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:16,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:31:16,322 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:31:16,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:16,322 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:31:16,322 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:16,322 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:31:16,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:16,323 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:16,323 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:16,536 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 822 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4606 [2021-05-22 02:31:16,536 INFO L430 AbstractCegarLoop]: === Iteration 834 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:16,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:16,536 INFO L82 PathProgramCache]: Analyzing trace with hash 2058687693, now seen corresponding path program 822 times [2021-05-22 02:31:16,536 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:16,536 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [780397733] [2021-05-22 02:31:16,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:16,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:16,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:16,642 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:16,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [780397733] [2021-05-22 02:31:16,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [780397733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:16,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [801730030] [2021-05-22 02:31:16,642 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 823 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 823 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:16,675 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:16,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:16,676 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:16,676 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:16,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:16,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:16,722 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,734 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:16,734 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:16,735 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:16,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:16,786 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,791 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:16,791 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:16,792 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:16,792 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:16,809 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:16,809 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [801730030] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:16,809 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:16,809 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:16,809 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1798809245] [2021-05-22 02:31:16,809 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:16,809 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:16,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:16,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:16,810 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:17,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:17,058 INFO L93 Difference]: Finished difference Result 637 states and 1970 transitions. [2021-05-22 02:31:17,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:17,059 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:17,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:17,060 INFO L225 Difference]: With dead ends: 637 [2021-05-22 02:31:17,060 INFO L226 Difference]: Without dead ends: 615 [2021-05-22 02:31:17,060 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 205.9ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:17,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 615 states. [2021-05-22 02:31:17,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 615 to 471. [2021-05-22 02:31:17,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1425531914893616) internal successors, (1477), 470 states have internal predecessors, (1477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:17,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1477 transitions. [2021-05-22 02:31:17,067 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1477 transitions. Word has length 21 [2021-05-22 02:31:17,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:17,067 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1477 transitions. [2021-05-22 02:31:17,067 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:17,067 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1477 transitions. [2021-05-22 02:31:17,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:17,067 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:17,068 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:17,281 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4609,823 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:17,282 INFO L430 AbstractCegarLoop]: === Iteration 835 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:17,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:17,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1420900691, now seen corresponding path program 823 times [2021-05-22 02:31:17,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:17,282 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [975359214] [2021-05-22 02:31:17,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:17,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:17,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:17,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:17,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [975359214] [2021-05-22 02:31:17,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [975359214] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:17,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [856417446] [2021-05-22 02:31:17,454 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 824 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 824 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:17,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:17,485 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:17,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:17,544 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:17,545 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:17,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:17,546 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:17,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:17,549 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:17,565 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:17,566 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:17,566 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:31:17,625 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:17,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:17,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:17,636 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:17,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:17,639 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:17,640 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:17,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:17,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:17,648 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:10 [2021-05-22 02:31:17,699 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:17,699 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [856417446] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:17,699 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:17,699 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:17,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835222995] [2021-05-22 02:31:17,700 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:17,700 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:17,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:17,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:17,700 INFO L87 Difference]: Start difference. First operand 471 states and 1477 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:18,116 INFO L93 Difference]: Finished difference Result 707 states and 2166 transitions. [2021-05-22 02:31:18,116 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:18,116 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:18,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:18,117 INFO L225 Difference]: With dead ends: 707 [2021-05-22 02:31:18,117 INFO L226 Difference]: Without dead ends: 688 [2021-05-22 02:31:18,118 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 401.3ms TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:18,118 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2021-05-22 02:31:18,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 471. [2021-05-22 02:31:18,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.129787234042553) internal successors, (1471), 470 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1471 transitions. [2021-05-22 02:31:18,125 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1471 transitions. Word has length 21 [2021-05-22 02:31:18,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:18,125 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1471 transitions. [2021-05-22 02:31:18,125 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,125 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1471 transitions. [2021-05-22 02:31:18,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:18,126 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:18,126 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:18,348 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4612,824 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:18,348 INFO L430 AbstractCegarLoop]: === Iteration 836 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:18,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:18,349 INFO L82 PathProgramCache]: Analyzing trace with hash 1145104717, now seen corresponding path program 824 times [2021-05-22 02:31:18,349 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:18,349 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918126189] [2021-05-22 02:31:18,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:18,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:18,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:18,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:18,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918126189] [2021-05-22 02:31:18,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918126189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:18,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2097490864] [2021-05-22 02:31:18,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 825 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 825 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:18,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:18,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:18,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:18,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:18,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:18,530 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:18,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:18,533 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:18,544 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:18,544 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:18,544 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:18,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:18,611 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:18,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:18,621 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:31:18,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:18,623 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:18,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:18,631 INFO L518 ElimStorePlain]: Eliminatee v_prenex_244 vanished before elimination [2021-05-22 02:31:18,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:18,632 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:31:18,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:18,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2097490864] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:18,653 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:18,653 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:18,653 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310712594] [2021-05-22 02:31:18,653 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:18,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:18,653 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:18,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:18,653 INFO L87 Difference]: Start difference. First operand 471 states and 1471 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:18,896 INFO L93 Difference]: Finished difference Result 653 states and 2014 transitions. [2021-05-22 02:31:18,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:18,896 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:18,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:18,897 INFO L225 Difference]: With dead ends: 653 [2021-05-22 02:31:18,897 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:31:18,897 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 199.1ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:18,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:31:18,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 471. [2021-05-22 02:31:18,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.129787234042553) internal successors, (1471), 470 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1471 transitions. [2021-05-22 02:31:18,904 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1471 transitions. Word has length 21 [2021-05-22 02:31:18,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:18,904 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1471 transitions. [2021-05-22 02:31:18,904 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:18,904 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1471 transitions. [2021-05-22 02:31:18,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:18,905 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:18,905 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:19,120 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4615,825 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:19,121 INFO L430 AbstractCegarLoop]: === Iteration 837 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:19,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:19,121 INFO L82 PathProgramCache]: Analyzing trace with hash 50405799, now seen corresponding path program 825 times [2021-05-22 02:31:19,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:19,121 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1381044245] [2021-05-22 02:31:19,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:19,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:19,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:19,237 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:19,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1381044245] [2021-05-22 02:31:19,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1381044245] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:19,237 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [607807847] [2021-05-22 02:31:19,237 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 826 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 826 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:19,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:31:19,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:19,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:19,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:19,335 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:19,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:19,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:19,348 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:19,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:19,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:31:19,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:19,447 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:19,449 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:19,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:19,450 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:19,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:19,469 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:19,469 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:19,470 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:19,488 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:19,489 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:19,489 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:63, output treesize:13 [2021-05-22 02:31:19,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:19,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [607807847] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:19,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:19,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:19,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337828261] [2021-05-22 02:31:19,557 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:19,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:19,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:19,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:19,558 INFO L87 Difference]: Start difference. First operand 471 states and 1471 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:20,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:20,888 INFO L93 Difference]: Finished difference Result 1063 states and 3157 transitions. [2021-05-22 02:31:20,889 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:31:20,889 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:20,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:20,890 INFO L225 Difference]: With dead ends: 1063 [2021-05-22 02:31:20,890 INFO L226 Difference]: Without dead ends: 1009 [2021-05-22 02:31:20,891 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 407 ImplicationChecksByTransitivity, 1011.6ms TimeCoverageRelationStatistics Valid=250, Invalid=1310, Unknown=0, NotChecked=0, Total=1560 [2021-05-22 02:31:20,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1009 states. [2021-05-22 02:31:20,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1009 to 472. [2021-05-22 02:31:20,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.150743099787686) internal successors, (1484), 471 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:20,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1484 transitions. [2021-05-22 02:31:20,899 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1484 transitions. Word has length 21 [2021-05-22 02:31:20,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:20,899 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1484 transitions. [2021-05-22 02:31:20,899 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:20,900 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1484 transitions. [2021-05-22 02:31:20,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:20,900 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:20,900 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:21,121 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4623,826 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:21,122 INFO L430 AbstractCegarLoop]: === Iteration 838 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:21,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:21,122 INFO L82 PathProgramCache]: Analyzing trace with hash -573879965, now seen corresponding path program 826 times [2021-05-22 02:31:21,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:21,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107934694] [2021-05-22 02:31:21,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:21,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:21,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:21,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:21,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107934694] [2021-05-22 02:31:21,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107934694] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:21,227 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748076843] [2021-05-22 02:31:21,227 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 827 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 827 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:21,257 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:21,257 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:21,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:21,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:21,361 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[v_prenex_245]} [2021-05-22 02:31:21,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:21,365 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:21,383 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:21,385 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:21,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:21,386 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:21,402 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:21,404 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:21,404 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:31:21,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:21,459 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:21,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:21,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:21,463 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:21,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:21,486 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:21,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:21,487 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:21,506 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:21,507 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:21,507 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:31:21,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:21,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748076843] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:21,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:21,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:21,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96693728] [2021-05-22 02:31:21,550 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:21,550 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:21,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:21,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:21,550 INFO L87 Difference]: Start difference. First operand 472 states and 1484 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:21,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:21,837 INFO L93 Difference]: Finished difference Result 661 states and 2044 transitions. [2021-05-22 02:31:21,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:21,837 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:21,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:21,838 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:31:21,838 INFO L226 Difference]: Without dead ends: 632 [2021-05-22 02:31:21,838 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 249.1ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:21,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-22 02:31:21,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 472. [2021-05-22 02:31:21,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.150743099787686) internal successors, (1484), 471 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:21,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1484 transitions. [2021-05-22 02:31:21,845 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1484 transitions. Word has length 21 [2021-05-22 02:31:21,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:21,846 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1484 transitions. [2021-05-22 02:31:21,846 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:21,846 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1484 transitions. [2021-05-22 02:31:21,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:21,846 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:21,846 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:22,064 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4632,827 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:22,064 INFO L430 AbstractCegarLoop]: === Iteration 839 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:22,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:22,064 INFO L82 PathProgramCache]: Analyzing trace with hash -276613555, now seen corresponding path program 827 times [2021-05-22 02:31:22,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:22,064 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965218335] [2021-05-22 02:31:22,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:22,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:22,190 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:22,190 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:22,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965218335] [2021-05-22 02:31:22,190 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965218335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:22,190 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1751380022] [2021-05-22 02:31:22,190 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 828 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 828 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:22,222 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:22,223 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:22,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:22,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:22,283 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:22,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:22,284 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:22,285 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:22,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:22,289 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:22,305 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:22,306 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:22,306 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:31:22,347 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:22,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:22,352 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:22,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:22,355 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:22,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:22,378 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:22,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:22,379 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:22,399 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:22,401 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:22,401 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:19 [2021-05-22 02:31:22,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:22,498 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1751380022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:22,498 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:22,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:22,499 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53101402] [2021-05-22 02:31:22,499 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:22,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:22,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:22,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:22,499 INFO L87 Difference]: Start difference. First operand 472 states and 1484 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:23,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:23,000 INFO L93 Difference]: Finished difference Result 799 states and 2464 transitions. [2021-05-22 02:31:23,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:23,001 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:23,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:23,002 INFO L225 Difference]: With dead ends: 799 [2021-05-22 02:31:23,002 INFO L226 Difference]: Without dead ends: 776 [2021-05-22 02:31:23,002 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 479.9ms TimeCoverageRelationStatistics Valid=110, Invalid=442, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:31:23,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 776 states. [2021-05-22 02:31:23,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 776 to 470. [2021-05-22 02:31:23,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1535181236673773) internal successors, (1479), 469 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:23,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1479 transitions. [2021-05-22 02:31:23,011 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1479 transitions. Word has length 21 [2021-05-22 02:31:23,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:23,011 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1479 transitions. [2021-05-22 02:31:23,012 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:23,012 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1479 transitions. [2021-05-22 02:31:23,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:23,012 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:23,012 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:23,234 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 828 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4639 [2021-05-22 02:31:23,234 INFO L430 AbstractCegarLoop]: === Iteration 840 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:23,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:23,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1565208177, now seen corresponding path program 828 times [2021-05-22 02:31:23,234 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:23,234 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [218472253] [2021-05-22 02:31:23,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:23,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:23,389 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:23,389 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:23,389 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [218472253] [2021-05-22 02:31:23,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [218472253] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:23,390 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846888192] [2021-05-22 02:31:23,390 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 829 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 829 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:23,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:23,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:23,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:23,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:23,497 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:23,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:23,498 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:23,509 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:23,511 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:23,511 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:31:23,570 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:23,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:23,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:23,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:23,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:23,575 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:23,596 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:23,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:23,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:23,600 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:23,623 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:23,624 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:23,624 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:19 [2021-05-22 02:31:23,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:23,729 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846888192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:23,729 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:23,729 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:23,729 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804724701] [2021-05-22 02:31:23,729 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:23,729 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:23,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:23,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:23,730 INFO L87 Difference]: Start difference. First operand 470 states and 1479 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:24,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:24,957 INFO L93 Difference]: Finished difference Result 1025 states and 3077 transitions. [2021-05-22 02:31:24,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-05-22 02:31:24,957 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:24,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:24,958 INFO L225 Difference]: With dead ends: 1025 [2021-05-22 02:31:24,958 INFO L226 Difference]: Without dead ends: 998 [2021-05-22 02:31:24,959 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 913.4ms TimeCoverageRelationStatistics Valid=232, Invalid=1250, Unknown=0, NotChecked=0, Total=1482 [2021-05-22 02:31:24,959 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 998 states. [2021-05-22 02:31:24,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 998 to 465. [2021-05-22 02:31:24,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1314655172413794) internal successors, (1453), 464 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:24,965 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1453 transitions. [2021-05-22 02:31:24,965 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1453 transitions. Word has length 21 [2021-05-22 02:31:24,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:24,965 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1453 transitions. [2021-05-22 02:31:24,965 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:24,965 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1453 transitions. [2021-05-22 02:31:24,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:24,965 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:24,965 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:25,166 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4647,829 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:25,166 INFO L430 AbstractCegarLoop]: === Iteration 841 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:25,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:25,166 INFO L82 PathProgramCache]: Analyzing trace with hash 822507213, now seen corresponding path program 829 times [2021-05-22 02:31:25,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:25,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [452434399] [2021-05-22 02:31:25,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:25,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:25,243 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:25,243 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:25,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [452434399] [2021-05-22 02:31:25,243 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [452434399] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:25,243 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994680193] [2021-05-22 02:31:25,243 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 830 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 830 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:25,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:25,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:25,269 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:25,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:25,302 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:25,304 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,313 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:25,313 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:25,314 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:25,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:25,350 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:25,353 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:25,353 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,354 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:25,366 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:25,366 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994680193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:25,366 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:25,366 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:25,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258413962] [2021-05-22 02:31:25,366 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:25,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:25,367 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:25,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:25,367 INFO L87 Difference]: Start difference. First operand 465 states and 1453 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:25,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:25,517 INFO L93 Difference]: Finished difference Result 632 states and 1950 transitions. [2021-05-22 02:31:25,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:25,517 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:25,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:25,518 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:31:25,518 INFO L226 Difference]: Without dead ends: 610 [2021-05-22 02:31:25,518 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 112.0ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:25,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2021-05-22 02:31:25,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 468. [2021-05-22 02:31:25,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.137044967880086) internal successors, (1465), 467 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:25,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1465 transitions. [2021-05-22 02:31:25,523 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1465 transitions. Word has length 21 [2021-05-22 02:31:25,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:25,523 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1465 transitions. [2021-05-22 02:31:25,523 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:25,523 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1465 transitions. [2021-05-22 02:31:25,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:25,523 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:25,523 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:25,724 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4659,830 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:25,724 INFO L430 AbstractCegarLoop]: === Iteration 842 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:25,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:25,724 INFO L82 PathProgramCache]: Analyzing trace with hash 1447831331, now seen corresponding path program 830 times [2021-05-22 02:31:25,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:25,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694071397] [2021-05-22 02:31:25,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:25,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:25,817 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:25,817 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:25,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694071397] [2021-05-22 02:31:25,817 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694071397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:25,817 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1405652434] [2021-05-22 02:31:25,817 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 831 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 831 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:25,850 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:25,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:25,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:25,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:25,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:25,891 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,897 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:25,898 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,898 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:31:25,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:25,946 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:25,949 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:25,956 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:25,956 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:25,957 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:25,957 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:31:25,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:25,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1405652434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:25,980 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:25,980 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:25,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059909626] [2021-05-22 02:31:25,980 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:25,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:25,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:25,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:25,980 INFO L87 Difference]: Start difference. First operand 468 states and 1465 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:26,114 INFO L93 Difference]: Finished difference Result 617 states and 1891 transitions. [2021-05-22 02:31:26,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:26,114 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:26,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:26,115 INFO L225 Difference]: With dead ends: 617 [2021-05-22 02:31:26,115 INFO L226 Difference]: Without dead ends: 590 [2021-05-22 02:31:26,115 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 138.6ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:26,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-22 02:31:26,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 468. [2021-05-22 02:31:26,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.132762312633833) internal successors, (1463), 467 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1463 transitions. [2021-05-22 02:31:26,120 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1463 transitions. Word has length 21 [2021-05-22 02:31:26,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:26,120 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1463 transitions. [2021-05-22 02:31:26,120 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 14 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,120 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1463 transitions. [2021-05-22 02:31:26,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:26,121 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:26,121 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:26,321 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 831 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4662 [2021-05-22 02:31:26,321 INFO L430 AbstractCegarLoop]: === Iteration 843 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:26,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:26,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1163568647, now seen corresponding path program 831 times [2021-05-22 02:31:26,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:26,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [954344464] [2021-05-22 02:31:26,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:26,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:26,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:26,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:26,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [954344464] [2021-05-22 02:31:26,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [954344464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:26,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626730693] [2021-05-22 02:31:26,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 832 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 832 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:26,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:26,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:26,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:26,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:26,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:26,457 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:26,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:26,459 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:26,467 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:26,468 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:26,468 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:26,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:26,515 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:26,522 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:26,522 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:26,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:26,525 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:26,530 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:26,531 INFO L518 ElimStorePlain]: Eliminatee v_prenex_247 vanished before elimination [2021-05-22 02:31:26,531 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:26,531 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:31:26,566 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:26,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626730693] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:26,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:26,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:26,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543458696] [2021-05-22 02:31:26,566 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:26,566 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:26,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:26,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:26,566 INFO L87 Difference]: Start difference. First operand 468 states and 1463 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:26,723 INFO L93 Difference]: Finished difference Result 670 states and 2038 transitions. [2021-05-22 02:31:26,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:31:26,723 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:26,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:26,724 INFO L225 Difference]: With dead ends: 670 [2021-05-22 02:31:26,724 INFO L226 Difference]: Without dead ends: 643 [2021-05-22 02:31:26,724 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 150.1ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:31:26,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-22 02:31:26,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 481. [2021-05-22 02:31:26,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.129166666666667) internal successors, (1502), 480 states have internal predecessors, (1502), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1502 transitions. [2021-05-22 02:31:26,730 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1502 transitions. Word has length 21 [2021-05-22 02:31:26,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:26,730 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1502 transitions. [2021-05-22 02:31:26,730 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:26,730 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1502 transitions. [2021-05-22 02:31:26,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:26,730 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:26,730 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:26,931 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4665,832 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:26,931 INFO L430 AbstractCegarLoop]: === Iteration 844 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:26,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:26,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1445006809, now seen corresponding path program 832 times [2021-05-22 02:31:26,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:26,931 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914989657] [2021-05-22 02:31:26,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:26,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:27,005 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:27,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:27,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914989657] [2021-05-22 02:31:27,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914989657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:27,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538475549] [2021-05-22 02:31:27,006 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 833 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 833 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:27,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:27,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:27,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:27,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:27,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:27,066 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:27,068 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,077 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:27,077 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:31:27,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:27,132 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,134 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:27,135 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,135 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:31:27,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:27,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538475549] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:27,145 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:27,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:27,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1791449549] [2021-05-22 02:31:27,146 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:27,146 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:27,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:27,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:27,146 INFO L87 Difference]: Start difference. First operand 481 states and 1502 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:27,349 INFO L93 Difference]: Finished difference Result 599 states and 1831 transitions. [2021-05-22 02:31:27,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:27,349 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:27,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:27,350 INFO L225 Difference]: With dead ends: 599 [2021-05-22 02:31:27,350 INFO L226 Difference]: Without dead ends: 578 [2021-05-22 02:31:27,350 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 135.7ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:27,351 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-05-22 02:31:27,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 471. [2021-05-22 02:31:27,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1382978723404253) internal successors, (1475), 470 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1475 transitions. [2021-05-22 02:31:27,355 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1475 transitions. Word has length 21 [2021-05-22 02:31:27,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:27,355 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1475 transitions. [2021-05-22 02:31:27,355 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,355 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1475 transitions. [2021-05-22 02:31:27,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:27,356 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:27,356 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:27,556 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4676,833 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:27,556 INFO L430 AbstractCegarLoop]: === Iteration 845 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:27,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:27,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1422502437, now seen corresponding path program 833 times [2021-05-22 02:31:27,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:27,557 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107710748] [2021-05-22 02:31:27,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:27,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:27,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:27,641 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:27,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107710748] [2021-05-22 02:31:27,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107710748] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:27,642 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375555806] [2021-05-22 02:31:27,642 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 834 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 834 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:27,668 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:27,668 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:27,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:27,669 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:27,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:27,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:27,722 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,738 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:27,738 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:27,771 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_248, v_prenex_249]} [2021-05-22 02:31:27,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:27,774 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,786 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,786 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:27,788 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:27,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:27,789 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,802 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:27,802 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:27,803 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:27,812 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:27,813 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:27,813 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:21 [2021-05-22 02:31:27,836 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:27,836 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375555806] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:27,836 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:27,836 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:27,836 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [251777358] [2021-05-22 02:31:27,836 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:27,836 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:27,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:27,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:27,837 INFO L87 Difference]: Start difference. First operand 471 states and 1475 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:27,974 INFO L93 Difference]: Finished difference Result 650 states and 2009 transitions. [2021-05-22 02:31:27,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:27,975 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:27,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:27,976 INFO L225 Difference]: With dead ends: 650 [2021-05-22 02:31:27,976 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:31:27,976 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 127.7ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:27,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:31:27,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 471. [2021-05-22 02:31:27,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1382978723404253) internal successors, (1475), 470 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1475 transitions. [2021-05-22 02:31:27,981 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1475 transitions. Word has length 21 [2021-05-22 02:31:27,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:27,981 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1475 transitions. [2021-05-22 02:31:27,981 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:27,981 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1475 transitions. [2021-05-22 02:31:27,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:27,981 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:27,981 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:28,182 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 834 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4682 [2021-05-22 02:31:28,182 INFO L430 AbstractCegarLoop]: === Iteration 846 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:28,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:28,182 INFO L82 PathProgramCache]: Analyzing trace with hash -1125236027, now seen corresponding path program 834 times [2021-05-22 02:31:28,182 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:28,182 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704274518] [2021-05-22 02:31:28,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:28,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:28,264 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:28,264 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:28,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704274518] [2021-05-22 02:31:28,265 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704274518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:28,265 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2054172840] [2021-05-22 02:31:28,265 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 835 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 835 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:28,290 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:28,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:28,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:28,291 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:28,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:28,321 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,326 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:28,326 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,326 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:31:28,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:28,347 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:28,350 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,358 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:28,358 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:28,358 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:28,359 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:31:28,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:28,400 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2054172840] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:28,400 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:28,400 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:28,400 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672973382] [2021-05-22 02:31:28,400 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:28,400 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:28,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:28,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:28,400 INFO L87 Difference]: Start difference. First operand 471 states and 1475 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:28,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:28,566 INFO L93 Difference]: Finished difference Result 607 states and 1866 transitions. [2021-05-22 02:31:28,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:28,566 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:28,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:28,567 INFO L225 Difference]: With dead ends: 607 [2021-05-22 02:31:28,567 INFO L226 Difference]: Without dead ends: 584 [2021-05-22 02:31:28,567 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 129.0ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:28,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-05-22 02:31:28,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 470. [2021-05-22 02:31:28,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1471215351812365) internal successors, (1476), 469 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:28,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1476 transitions. [2021-05-22 02:31:28,571 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1476 transitions. Word has length 21 [2021-05-22 02:31:28,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:28,571 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1476 transitions. [2021-05-22 02:31:28,572 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:28,572 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1476 transitions. [2021-05-22 02:31:28,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:28,572 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:28,572 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:28,772 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4688,835 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:28,773 INFO L430 AbstractCegarLoop]: === Iteration 847 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:28,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:28,773 INFO L82 PathProgramCache]: Analyzing trace with hash -1409498711, now seen corresponding path program 835 times [2021-05-22 02:31:28,773 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:28,773 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [882277225] [2021-05-22 02:31:28,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:28,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:28,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:28,866 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:28,866 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [882277225] [2021-05-22 02:31:28,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [882277225] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:28,867 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1995364432] [2021-05-22 02:31:28,867 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 836 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 836 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:28,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:28,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:28,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:28,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:28,944 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:28,946 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:28,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:28,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:28,962 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:28,997 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_250, v_prenex_251]} [2021-05-22 02:31:28,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:29,000 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:29,012 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:29,012 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:29,014 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:29,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:29,015 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:29,025 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:29,027 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:29,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:29,028 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:29,037 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:29,038 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:29,038 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:31:29,112 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:29,113 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1995364432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:29,113 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:29,113 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:29,113 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409126756] [2021-05-22 02:31:29,113 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:29,113 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:29,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:29,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:29,113 INFO L87 Difference]: Start difference. First operand 470 states and 1476 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:29,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:29,781 INFO L93 Difference]: Finished difference Result 951 states and 2881 transitions. [2021-05-22 02:31:29,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-05-22 02:31:29,782 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:29,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:29,783 INFO L225 Difference]: With dead ends: 951 [2021-05-22 02:31:29,783 INFO L226 Difference]: Without dead ends: 924 [2021-05-22 02:31:29,783 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 543.2ms TimeCoverageRelationStatistics Valid=167, Invalid=825, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:31:29,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 924 states. [2021-05-22 02:31:29,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 924 to 481. [2021-05-22 02:31:29,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.15) internal successors, (1512), 480 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:29,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1512 transitions. [2021-05-22 02:31:29,789 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1512 transitions. Word has length 21 [2021-05-22 02:31:29,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:29,789 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1512 transitions. [2021-05-22 02:31:29,790 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:29,790 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1512 transitions. [2021-05-22 02:31:29,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:29,790 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:29,790 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:29,990 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 836 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4694 [2021-05-22 02:31:29,991 INFO L430 AbstractCegarLoop]: === Iteration 848 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:29,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:29,991 INFO L82 PathProgramCache]: Analyzing trace with hash 666191079, now seen corresponding path program 836 times [2021-05-22 02:31:29,991 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:29,991 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1663901885] [2021-05-22 02:31:29,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:29,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:30,085 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:30,085 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:30,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1663901885] [2021-05-22 02:31:30,085 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1663901885] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:30,085 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509850090] [2021-05-22 02:31:30,085 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 837 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 837 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:30,110 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:30,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:30,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:30,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:30,161 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:30,162 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:30,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:30,165 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:30,178 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:30,180 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:30,180 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:30,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:30,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:30,231 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:30,237 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:30,239 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:30,239 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:30,239 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:30,245 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:30,245 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:30,245 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:31:30,290 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:30,290 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509850090] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:30,290 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:30,290 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:30,290 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849712266] [2021-05-22 02:31:30,290 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:30,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:30,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:30,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:30,290 INFO L87 Difference]: Start difference. First operand 481 states and 1512 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:30,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:30,888 INFO L93 Difference]: Finished difference Result 829 states and 2541 transitions. [2021-05-22 02:31:30,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:31:30,888 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:30,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:30,889 INFO L225 Difference]: With dead ends: 829 [2021-05-22 02:31:30,889 INFO L226 Difference]: Without dead ends: 808 [2021-05-22 02:31:30,889 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 412.9ms TimeCoverageRelationStatistics Valid=119, Invalid=583, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:31:30,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 808 states. [2021-05-22 02:31:30,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 808 to 464. [2021-05-22 02:31:30,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1295896328293735) internal successors, (1449), 463 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:30,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1449 transitions. [2021-05-22 02:31:30,895 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1449 transitions. Word has length 21 [2021-05-22 02:31:30,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:30,895 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1449 transitions. [2021-05-22 02:31:30,895 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:30,895 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1449 transitions. [2021-05-22 02:31:30,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:30,896 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:30,896 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:31,096 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 837 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4707 [2021-05-22 02:31:31,096 INFO L430 AbstractCegarLoop]: === Iteration 849 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:31,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:31,096 INFO L82 PathProgramCache]: Analyzing trace with hash 170372643, now seen corresponding path program 837 times [2021-05-22 02:31:31,097 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:31,097 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1732520666] [2021-05-22 02:31:31,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:31,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:31,164 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:31,165 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:31,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1732520666] [2021-05-22 02:31:31,165 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1732520666] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:31,165 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [746427861] [2021-05-22 02:31:31,165 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 838 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 838 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:31,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:31,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:31,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:31,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:31,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:31,227 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,229 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:31,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:31,229 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,241 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:31,242 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:31,242 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:29 [2021-05-22 02:31:31,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:31,263 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,266 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:31,266 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:31,266 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,266 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:31,279 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:31,279 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [746427861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:31,279 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:31,279 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:31:31,279 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944809401] [2021-05-22 02:31:31,279 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:31:31,279 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:31,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:31:31,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:31:31,279 INFO L87 Difference]: Start difference. First operand 464 states and 1449 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:31,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:31,408 INFO L93 Difference]: Finished difference Result 824 states and 2528 transitions. [2021-05-22 02:31:31,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:31,408 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:31,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:31,409 INFO L225 Difference]: With dead ends: 824 [2021-05-22 02:31:31,409 INFO L226 Difference]: Without dead ends: 802 [2021-05-22 02:31:31,409 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 89.1ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:31:31,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 802 states. [2021-05-22 02:31:31,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 802 to 467. [2021-05-22 02:31:31,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1351931330472103) internal successors, (1461), 466 states have internal predecessors, (1461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:31,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1461 transitions. [2021-05-22 02:31:31,415 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1461 transitions. Word has length 21 [2021-05-22 02:31:31,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:31,415 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1461 transitions. [2021-05-22 02:31:31,415 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:31,415 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1461 transitions. [2021-05-22 02:31:31,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:31,416 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:31,416 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:31,616 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 838 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4712 [2021-05-22 02:31:31,616 INFO L430 AbstractCegarLoop]: === Iteration 850 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:31,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:31,616 INFO L82 PathProgramCache]: Analyzing trace with hash 449517039, now seen corresponding path program 838 times [2021-05-22 02:31:31,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:31,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865361433] [2021-05-22 02:31:31,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:31,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:31,695 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:31,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:31,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865361433] [2021-05-22 02:31:31,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865361433] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:31,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271989414] [2021-05-22 02:31:31,696 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 839 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 839 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:31,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:31,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:31,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:31,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:31,745 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:31,746 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,749 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:31,750 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,750 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:31:31,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:31,795 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:31,797 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:31,803 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:31,803 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:31,804 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:31,804 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:31:31,847 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:31,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271989414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:31,848 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:31,848 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:31,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877279256] [2021-05-22 02:31:31,848 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:31,848 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:31,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:31,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:31,848 INFO L87 Difference]: Start difference. First operand 467 states and 1461 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:32,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:32,191 INFO L93 Difference]: Finished difference Result 861 states and 2621 transitions. [2021-05-22 02:31:32,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:31:32,191 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:32,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:32,192 INFO L225 Difference]: With dead ends: 861 [2021-05-22 02:31:32,192 INFO L226 Difference]: Without dead ends: 830 [2021-05-22 02:31:32,192 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 281.9ms TimeCoverageRelationStatistics Valid=132, Invalid=518, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:31:32,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 830 states. [2021-05-22 02:31:32,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 830 to 470. [2021-05-22 02:31:32,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1321961620469083) internal successors, (1469), 469 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:32,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1469 transitions. [2021-05-22 02:31:32,198 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1469 transitions. Word has length 21 [2021-05-22 02:31:32,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:32,198 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1469 transitions. [2021-05-22 02:31:32,198 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:32,198 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1469 transitions. [2021-05-22 02:31:32,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:32,199 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:32,199 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:32,399 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4716,839 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:32,399 INFO L430 AbstractCegarLoop]: === Iteration 851 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:32,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:32,400 INFO L82 PathProgramCache]: Analyzing trace with hash 165254355, now seen corresponding path program 839 times [2021-05-22 02:31:32,400 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:32,400 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [247236926] [2021-05-22 02:31:32,400 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:32,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:32,483 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:32,483 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:32,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [247236926] [2021-05-22 02:31:32,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [247236926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:32,483 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1050461976] [2021-05-22 02:31:32,483 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 840 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 840 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:32,509 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:32,509 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:32,509 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:32,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:32,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:32,549 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:32,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:32,552 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:32,560 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:32,561 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:32,561 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:31:32,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:32,628 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:32,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:32,631 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:32,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:32,639 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:32,639 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:32,639 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:31:32,702 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:32,702 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1050461976] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:32,702 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:32,702 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:32,702 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1038465551] [2021-05-22 02:31:32,702 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:32,703 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:32,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:32,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:32,703 INFO L87 Difference]: Start difference. First operand 470 states and 1469 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:33,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:33,321 INFO L93 Difference]: Finished difference Result 1023 states and 3104 transitions. [2021-05-22 02:31:33,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-22 02:31:33,322 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:33,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:33,323 INFO L225 Difference]: With dead ends: 1023 [2021-05-22 02:31:33,323 INFO L226 Difference]: Without dead ends: 996 [2021-05-22 02:31:33,323 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 512.9ms TimeCoverageRelationStatistics Valid=176, Invalid=754, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:31:33,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 996 states. [2021-05-22 02:31:33,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 996 to 491. [2021-05-22 02:31:33,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.1551020408163266) internal successors, (1546), 490 states have internal predecessors, (1546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:33,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1546 transitions. [2021-05-22 02:31:33,330 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1546 transitions. Word has length 21 [2021-05-22 02:31:33,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:33,330 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1546 transitions. [2021-05-22 02:31:33,330 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:33,330 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1546 transitions. [2021-05-22 02:31:33,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:33,330 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:33,330 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:33,531 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 840 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4719 [2021-05-22 02:31:33,531 INFO L430 AbstractCegarLoop]: === Iteration 852 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:33,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:33,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1851646195, now seen corresponding path program 840 times [2021-05-22 02:31:33,531 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:33,531 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910743452] [2021-05-22 02:31:33,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:33,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:33,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:33,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910743452] [2021-05-22 02:31:33,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910743452] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:33,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996097873] [2021-05-22 02:31:33,609 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 841 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 841 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:33,633 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:33,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:33,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:33,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:33,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:33,661 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:33,663 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:33,664 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:33,670 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:33,670 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:33,670 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:31:33,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:33,730 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:33,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:33,732 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:33,733 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:33,733 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:31:33,760 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:33,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [996097873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:33,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:33,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:33,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374379326] [2021-05-22 02:31:33,760 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:33,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:33,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:33,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:33,760 INFO L87 Difference]: Start difference. First operand 491 states and 1546 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:34,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:34,211 INFO L93 Difference]: Finished difference Result 965 states and 2948 transitions. [2021-05-22 02:31:34,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:31:34,212 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:34,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:34,213 INFO L225 Difference]: With dead ends: 965 [2021-05-22 02:31:34,213 INFO L226 Difference]: Without dead ends: 944 [2021-05-22 02:31:34,213 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 362.8ms TimeCoverageRelationStatistics Valid=148, Invalid=664, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:31:34,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 944 states. [2021-05-22 02:31:34,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 944 to 489. [2021-05-22 02:31:34,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 489 states, 488 states have (on average 3.1577868852459017) internal successors, (1541), 488 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:34,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 489 states to 489 states and 1541 transitions. [2021-05-22 02:31:34,220 INFO L78 Accepts]: Start accepts. Automaton has 489 states and 1541 transitions. Word has length 21 [2021-05-22 02:31:34,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:34,220 INFO L482 AbstractCegarLoop]: Abstraction has 489 states and 1541 transitions. [2021-05-22 02:31:34,220 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:34,220 INFO L276 IsEmpty]: Start isEmpty. Operand 489 states and 1541 transitions. [2021-05-22 02:31:34,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:34,221 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:34,221 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:34,421 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4729,841 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:34,421 INFO L430 AbstractCegarLoop]: === Iteration 853 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:34,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:34,421 INFO L82 PathProgramCache]: Analyzing trace with hash -1403085303, now seen corresponding path program 841 times [2021-05-22 02:31:34,421 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:34,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39601853] [2021-05-22 02:31:34,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:34,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:34,513 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:34,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:34,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39601853] [2021-05-22 02:31:34,514 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39601853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:34,514 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152268965] [2021-05-22 02:31:34,514 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 842 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 842 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:34,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:34,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:34,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:34,579 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:34,580 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:34,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:34,582 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:34,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:34,589 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:34,589 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:31:34,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:34,645 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:34,647 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:34,647 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:34,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:34,648 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:31:34,675 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:34,675 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152268965] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:34,675 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:34,675 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:34,675 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1389966661] [2021-05-22 02:31:34,676 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:34,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:34,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:34,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:34,676 INFO L87 Difference]: Start difference. First operand 489 states and 1541 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:35,280 INFO L93 Difference]: Finished difference Result 1040 states and 3157 transitions. [2021-05-22 02:31:35,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-22 02:31:35,280 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:35,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:35,282 INFO L225 Difference]: With dead ends: 1040 [2021-05-22 02:31:35,282 INFO L226 Difference]: Without dead ends: 1019 [2021-05-22 02:31:35,282 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 484.4ms TimeCoverageRelationStatistics Valid=231, Invalid=959, Unknown=0, NotChecked=0, Total=1190 [2021-05-22 02:31:35,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2021-05-22 02:31:35,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 469. [2021-05-22 02:31:35,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.141025641025641) internal successors, (1470), 468 states have internal predecessors, (1470), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1470 transitions. [2021-05-22 02:31:35,288 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1470 transitions. Word has length 21 [2021-05-22 02:31:35,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:35,288 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1470 transitions. [2021-05-22 02:31:35,289 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,289 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1470 transitions. [2021-05-22 02:31:35,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:35,289 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:35,289 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:35,489 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4735,842 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:35,490 INFO L430 AbstractCegarLoop]: === Iteration 854 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:35,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:35,490 INFO L82 PathProgramCache]: Analyzing trace with hash -1996842505, now seen corresponding path program 842 times [2021-05-22 02:31:35,490 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:35,490 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455803434] [2021-05-22 02:31:35,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:35,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:35,561 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:35,562 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:35,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455803434] [2021-05-22 02:31:35,562 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455803434] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:35,562 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50381366] [2021-05-22 02:31:35,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 843 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 843 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:35,586 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:35,586 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:35,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:35,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:35,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:35,608 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:35,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:35,610 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:35,616 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:35,617 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:35,617 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:31:35,651 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:35,652 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:35,655 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:35,655 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:35,655 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:35,655 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:31:35,668 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:35,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50381366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:35,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:35,669 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:31:35,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292627214] [2021-05-22 02:31:35,669 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:31:35,669 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:35,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:31:35,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:31:35,669 INFO L87 Difference]: Start difference. First operand 469 states and 1470 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:35,809 INFO L93 Difference]: Finished difference Result 752 states and 2321 transitions. [2021-05-22 02:31:35,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:35,810 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:35,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:35,811 INFO L225 Difference]: With dead ends: 752 [2021-05-22 02:31:35,811 INFO L226 Difference]: Without dead ends: 730 [2021-05-22 02:31:35,811 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 100.4ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:35,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 730 states. [2021-05-22 02:31:35,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 730 to 471. [2021-05-22 02:31:35,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1382978723404253) internal successors, (1475), 470 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1475 transitions. [2021-05-22 02:31:35,816 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1475 transitions. Word has length 21 [2021-05-22 02:31:35,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:35,816 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1475 transitions. [2021-05-22 02:31:35,816 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:35,816 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1475 transitions. [2021-05-22 02:31:35,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:35,817 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:35,817 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:36,017 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4741,843 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:36,017 INFO L430 AbstractCegarLoop]: === Iteration 855 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:36,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:36,017 INFO L82 PathProgramCache]: Analyzing trace with hash 53115141, now seen corresponding path program 843 times [2021-05-22 02:31:36,018 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:36,018 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869929857] [2021-05-22 02:31:36,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:36,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:36,098 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:36,099 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:36,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869929857] [2021-05-22 02:31:36,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1869929857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:36,099 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025450841] [2021-05-22 02:31:36,099 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 844 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 844 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:36,125 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:36,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:36,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:36,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:36,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:36,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:36,163 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:36,176 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:36,176 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:31:36,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:36,203 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:36,205 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:36,214 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:36,214 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:36,215 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:31:36,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:36,237 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2025450841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:36,237 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:36,237 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:31:36,237 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1751216258] [2021-05-22 02:31:36,237 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:31:36,237 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:36,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:31:36,237 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:31:36,238 INFO L87 Difference]: Start difference. First operand 471 states and 1475 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:36,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:36,439 INFO L93 Difference]: Finished difference Result 763 states and 2348 transitions. [2021-05-22 02:31:36,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:36,440 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:36,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:36,441 INFO L225 Difference]: With dead ends: 763 [2021-05-22 02:31:36,441 INFO L226 Difference]: Without dead ends: 734 [2021-05-22 02:31:36,441 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 128.6ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:36,441 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 734 states. [2021-05-22 02:31:36,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 734 to 463. [2021-05-22 02:31:36,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1277056277056277) internal successors, (1445), 462 states have internal predecessors, (1445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:36,446 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1445 transitions. [2021-05-22 02:31:36,446 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1445 transitions. Word has length 21 [2021-05-22 02:31:36,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:36,446 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1445 transitions. [2021-05-22 02:31:36,447 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:36,447 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1445 transitions. [2021-05-22 02:31:36,447 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:36,447 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:36,447 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:36,647 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4744,844 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:36,648 INFO L430 AbstractCegarLoop]: === Iteration 856 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:36,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:36,648 INFO L82 PathProgramCache]: Analyzing trace with hash 124238837, now seen corresponding path program 844 times [2021-05-22 02:31:36,648 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:36,648 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1087628193] [2021-05-22 02:31:36,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:36,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:36,748 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:36,748 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:36,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1087628193] [2021-05-22 02:31:36,748 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1087628193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:36,748 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020335763] [2021-05-22 02:31:36,749 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 845 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 845 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:36,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:36,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:36,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:36,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:36,839 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:36,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:36,840 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,844 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:36,845 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,845 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:31:36,880 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:36,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:36,882 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,887 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:36,888 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:36,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:36,889 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,894 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:36,894 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:36,894 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:9 [2021-05-22 02:31:36,902 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:36,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1020335763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:36,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:36,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:36,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [925015310] [2021-05-22 02:31:36,903 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:36,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:36,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:36,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:36,903 INFO L87 Difference]: Start difference. First operand 463 states and 1445 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:37,032 INFO L93 Difference]: Finished difference Result 543 states and 1676 transitions. [2021-05-22 02:31:37,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:37,032 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:37,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:37,033 INFO L225 Difference]: With dead ends: 543 [2021-05-22 02:31:37,033 INFO L226 Difference]: Without dead ends: 521 [2021-05-22 02:31:37,033 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 160.5ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:37,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 521 states. [2021-05-22 02:31:37,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 521 to 469. [2021-05-22 02:31:37,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1324786324786325) internal successors, (1466), 468 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1466 transitions. [2021-05-22 02:31:37,037 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1466 transitions. Word has length 21 [2021-05-22 02:31:37,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:37,038 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1466 transitions. [2021-05-22 02:31:37,038 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,038 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1466 transitions. [2021-05-22 02:31:37,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:37,038 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:37,038 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:37,238 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 845 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4749 [2021-05-22 02:31:37,239 INFO L430 AbstractCegarLoop]: === Iteration 857 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:37,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:37,239 INFO L82 PathProgramCache]: Analyzing trace with hash -377552499, now seen corresponding path program 845 times [2021-05-22 02:31:37,239 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:37,239 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1211501734] [2021-05-22 02:31:37,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:37,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:37,336 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:37,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:37,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1211501734] [2021-05-22 02:31:37,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1211501734] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:37,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1629477488] [2021-05-22 02:31:37,337 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 846 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 846 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:37,363 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:37,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:37,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:37,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:37,460 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:37,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:37,461 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:37,468 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:37,469 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:37,469 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:31:37,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:37,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:37,498 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:37,507 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:37,509 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:37,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:37,509 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:37,517 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:37,518 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:37,518 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:31:37,531 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:37,531 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1629477488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:37,531 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:37,531 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:37,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401016614] [2021-05-22 02:31:37,532 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:37,532 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:37,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:37,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:37,532 INFO L87 Difference]: Start difference. First operand 469 states and 1466 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:37,686 INFO L93 Difference]: Finished difference Result 552 states and 1700 transitions. [2021-05-22 02:31:37,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:37,686 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:37,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:37,687 INFO L225 Difference]: With dead ends: 552 [2021-05-22 02:31:37,687 INFO L226 Difference]: Without dead ends: 530 [2021-05-22 02:31:37,687 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 159.6ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:37,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2021-05-22 02:31:37,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 466. [2021-05-22 02:31:37,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1268817204301076) internal successors, (1454), 465 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1454 transitions. [2021-05-22 02:31:37,691 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1454 transitions. Word has length 21 [2021-05-22 02:31:37,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:37,691 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1454 transitions. [2021-05-22 02:31:37,691 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:37,691 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1454 transitions. [2021-05-22 02:31:37,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:37,692 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:37,692 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:37,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4751,846 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:37,892 INFO L430 AbstractCegarLoop]: === Iteration 858 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:37,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:37,893 INFO L82 PathProgramCache]: Analyzing trace with hash 1810630677, now seen corresponding path program 846 times [2021-05-22 02:31:37,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:37,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [962485116] [2021-05-22 02:31:37,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:37,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:37,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:37,984 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:37,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [962485116] [2021-05-22 02:31:37,984 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [962485116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:37,984 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [836613322] [2021-05-22 02:31:37,984 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 847 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 847 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:38,008 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:38,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:38,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:38,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:38,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:38,069 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,075 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:38,075 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:31:38,097 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:38,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:38,098 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,104 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,106 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:38,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:38,106 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,112 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,112 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,112 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:31:38,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:38,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [836613322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:38,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:38,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:38,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378105799] [2021-05-22 02:31:38,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:38,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:38,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:38,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:38,126 INFO L87 Difference]: Start difference. First operand 466 states and 1454 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:38,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:38,236 INFO L93 Difference]: Finished difference Result 540 states and 1667 transitions. [2021-05-22 02:31:38,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:38,236 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:38,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:38,237 INFO L225 Difference]: With dead ends: 540 [2021-05-22 02:31:38,237 INFO L226 Difference]: Without dead ends: 518 [2021-05-22 02:31:38,237 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 135.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:38,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-22 02:31:38,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 463. [2021-05-22 02:31:38,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1277056277056277) internal successors, (1445), 462 states have internal predecessors, (1445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:38,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1445 transitions. [2021-05-22 02:31:38,247 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1445 transitions. Word has length 21 [2021-05-22 02:31:38,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:38,247 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1445 transitions. [2021-05-22 02:31:38,247 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:38,247 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1445 transitions. [2021-05-22 02:31:38,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:38,247 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:38,247 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:38,447 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4754,847 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:38,448 INFO L430 AbstractCegarLoop]: === Iteration 859 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:38,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:38,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1164956425, now seen corresponding path program 847 times [2021-05-22 02:31:38,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:38,448 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [763558859] [2021-05-22 02:31:38,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:38,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:38,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:38,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:38,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [763558859] [2021-05-22 02:31:38,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [763558859] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:38,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [58908588] [2021-05-22 02:31:38,549 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 848 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 848 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:38,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:38,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:38,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:38,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:38,637 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,644 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:38,644 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:26 [2021-05-22 02:31:38,677 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:38,678 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:38,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:38,679 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:38,682 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,694 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,696 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:38,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:38,696 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:38,708 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:38,709 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:38,709 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:31:38,755 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:38,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [58908588] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:38,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:38,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:38,756 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615582555] [2021-05-22 02:31:38,756 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:38,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:38,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:38,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:38,756 INFO L87 Difference]: Start difference. First operand 463 states and 1445 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:39,093 INFO L93 Difference]: Finished difference Result 728 states and 2239 transitions. [2021-05-22 02:31:39,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:39,093 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:39,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:39,094 INFO L225 Difference]: With dead ends: 728 [2021-05-22 02:31:39,094 INFO L226 Difference]: Without dead ends: 701 [2021-05-22 02:31:39,094 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 264.1ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:39,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2021-05-22 02:31:39,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 461. [2021-05-22 02:31:39,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.130434782608696) internal successors, (1440), 460 states have internal predecessors, (1440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1440 transitions. [2021-05-22 02:31:39,100 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1440 transitions. Word has length 21 [2021-05-22 02:31:39,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:39,100 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1440 transitions. [2021-05-22 02:31:39,100 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,100 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1440 transitions. [2021-05-22 02:31:39,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:39,101 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:39,101 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:39,301 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4756,848 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:39,301 INFO L430 AbstractCegarLoop]: === Iteration 860 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:39,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:39,301 INFO L82 PathProgramCache]: Analyzing trace with hash -751583577, now seen corresponding path program 848 times [2021-05-22 02:31:39,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:39,302 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450467264] [2021-05-22 02:31:39,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:39,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:39,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:39,401 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:39,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450467264] [2021-05-22 02:31:39,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450467264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:39,401 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [464899282] [2021-05-22 02:31:39,401 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 849 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 849 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:39,426 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:39,426 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:39,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:39,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:39,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:39,471 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:39,472 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:39,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:39,473 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:39,484 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:39,485 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:39,485 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:31:39,544 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:39,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:39,546 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:39,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:39,553 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:39,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:39,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:39,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:39,558 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:39,558 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:9 [2021-05-22 02:31:39,566 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:39,566 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [464899282] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:39,566 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:39,566 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:39,566 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390202830] [2021-05-22 02:31:39,567 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:39,567 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:39,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:39,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:39,567 INFO L87 Difference]: Start difference. First operand 461 states and 1440 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:39,750 INFO L93 Difference]: Finished difference Result 587 states and 1807 transitions. [2021-05-22 02:31:39,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:39,751 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:39,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:39,751 INFO L225 Difference]: With dead ends: 587 [2021-05-22 02:31:39,751 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:31:39,751 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 161.0ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:39,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:31:39,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 464. [2021-05-22 02:31:39,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.136069114470842) internal successors, (1452), 463 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1452 transitions. [2021-05-22 02:31:39,756 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1452 transitions. Word has length 21 [2021-05-22 02:31:39,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:39,756 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1452 transitions. [2021-05-22 02:31:39,756 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:39,756 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1452 transitions. [2021-05-22 02:31:39,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:39,757 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:39,757 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:39,957 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4763,849 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:39,958 INFO L430 AbstractCegarLoop]: === Iteration 861 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:39,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:39,958 INFO L82 PathProgramCache]: Analyzing trace with hash -1253374913, now seen corresponding path program 849 times [2021-05-22 02:31:39,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:39,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1702718193] [2021-05-22 02:31:39,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:39,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:40,060 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:40,060 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:40,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1702718193] [2021-05-22 02:31:40,060 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1702718193] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:40,060 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555602993] [2021-05-22 02:31:40,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 850 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 850 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:40,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:40,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:40,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:40,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:40,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:40,129 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:40,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:40,132 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,143 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,144 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:40,144 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:31:40,186 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:40,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:40,188 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,196 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:40,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:40,197 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,202 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,203 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,203 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:31:40,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:40,215 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555602993] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:40,215 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:40,215 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:40,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725827163] [2021-05-22 02:31:40,216 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:40,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:40,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:40,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:40,216 INFO L87 Difference]: Start difference. First operand 464 states and 1452 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:40,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:40,370 INFO L93 Difference]: Finished difference Result 578 states and 1783 transitions. [2021-05-22 02:31:40,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:40,370 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:40,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:40,371 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:31:40,371 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:31:40,371 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 150.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:40,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:31:40,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 461. [2021-05-22 02:31:40,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.130434782608696) internal successors, (1440), 460 states have internal predecessors, (1440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:40,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1440 transitions. [2021-05-22 02:31:40,376 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1440 transitions. Word has length 21 [2021-05-22 02:31:40,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:40,376 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1440 transitions. [2021-05-22 02:31:40,376 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:40,376 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1440 transitions. [2021-05-22 02:31:40,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:40,376 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:40,376 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:40,577 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4766,850 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:40,577 INFO L430 AbstractCegarLoop]: === Iteration 862 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:40,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:40,577 INFO L82 PathProgramCache]: Analyzing trace with hash 2128009407, now seen corresponding path program 850 times [2021-05-22 02:31:40,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:40,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778132795] [2021-05-22 02:31:40,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:40,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:40,678 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:40,678 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:40,678 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778132795] [2021-05-22 02:31:40,678 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778132795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:40,679 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453737987] [2021-05-22 02:31:40,679 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 851 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 851 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:40,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:40,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:40,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:40,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:40,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:40,748 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,749 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:40,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:40,750 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,762 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:40,762 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:31:40,819 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:40,822 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:40,823 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:40,825 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,837 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,838 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:40,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:40,839 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:40,851 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:40,851 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:40,852 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:31:40,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:40,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [453737987] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:40,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:40,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:40,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658349275] [2021-05-22 02:31:40,878 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:40,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:40,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:40,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:40,878 INFO L87 Difference]: Start difference. First operand 461 states and 1440 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:41,044 INFO L93 Difference]: Finished difference Result 598 states and 1843 transitions. [2021-05-22 02:31:41,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:41,044 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:41,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:41,045 INFO L225 Difference]: With dead ends: 598 [2021-05-22 02:31:41,045 INFO L226 Difference]: Without dead ends: 569 [2021-05-22 02:31:41,045 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 168.3ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:41,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-22 02:31:41,049 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 461. [2021-05-22 02:31:41,049 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.130434782608696) internal successors, (1440), 460 states have internal predecessors, (1440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1440 transitions. [2021-05-22 02:31:41,050 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1440 transitions. Word has length 21 [2021-05-22 02:31:41,050 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:41,050 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1440 transitions. [2021-05-22 02:31:41,050 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,050 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1440 transitions. [2021-05-22 02:31:41,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:41,051 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:41,051 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:41,251 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4769,851 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:41,251 INFO L430 AbstractCegarLoop]: === Iteration 863 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:41,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:41,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1033310489, now seen corresponding path program 851 times [2021-05-22 02:31:41,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:41,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302420192] [2021-05-22 02:31:41,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:41,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:41,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:41,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:41,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302420192] [2021-05-22 02:31:41,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302420192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:41,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440071998] [2021-05-22 02:31:41,358 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 852 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 852 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:41,383 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:31:41,383 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:41,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:41,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:41,432 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:41,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:41,433 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:41,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:41,442 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:41,442 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:31:41,518 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:41,519 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:41,519 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:41,520 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:41,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:41,523 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:41,537 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:41,539 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:41,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:41,540 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:41,553 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:41,554 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:41,554 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:63, output treesize:16 [2021-05-22 02:31:41,604 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:41,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440071998] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:41,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:41,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:41,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788611262] [2021-05-22 02:31:41,604 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:41,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:41,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:41,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:41,604 INFO L87 Difference]: Start difference. First operand 461 states and 1440 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:41,981 INFO L93 Difference]: Finished difference Result 795 states and 2419 transitions. [2021-05-22 02:31:41,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:31:41,981 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:41,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:41,982 INFO L225 Difference]: With dead ends: 795 [2021-05-22 02:31:41,982 INFO L226 Difference]: Without dead ends: 741 [2021-05-22 02:31:41,982 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 303.9ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:31:41,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2021-05-22 02:31:41,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 462. [2021-05-22 02:31:41,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1518438177874186) internal successors, (1453), 461 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1453 transitions. [2021-05-22 02:31:41,988 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1453 transitions. Word has length 21 [2021-05-22 02:31:41,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:41,988 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1453 transitions. [2021-05-22 02:31:41,988 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:41,988 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1453 transitions. [2021-05-22 02:31:41,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:41,988 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:41,988 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:42,189 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 852 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4777 [2021-05-22 02:31:42,189 INFO L430 AbstractCegarLoop]: === Iteration 864 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:42,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:42,189 INFO L82 PathProgramCache]: Analyzing trace with hash 409024725, now seen corresponding path program 852 times [2021-05-22 02:31:42,189 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:42,189 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283531258] [2021-05-22 02:31:42,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:42,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:42,292 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:42,292 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:42,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283531258] [2021-05-22 02:31:42,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283531258] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:42,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893271115] [2021-05-22 02:31:42,292 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 853 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 853 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:42,317 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:42,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:42,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:42,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:42,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:42,361 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:42,363 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:42,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:42,364 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:42,375 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:42,376 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:42,376 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:31:42,406 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_2]} [2021-05-22 02:31:42,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:42,409 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:42,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:42,411 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:42,427 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:42,429 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:42,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:42,429 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:42,443 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:42,444 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:42,444 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:21 [2021-05-22 02:31:42,477 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:42,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893271115] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:42,478 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:42,478 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:42,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610520798] [2021-05-22 02:31:42,478 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:42,478 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:42,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:42,478 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:42,478 INFO L87 Difference]: Start difference. First operand 462 states and 1453 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:42,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:42,631 INFO L93 Difference]: Finished difference Result 602 states and 1859 transitions. [2021-05-22 02:31:42,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:42,632 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:42,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:42,632 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:31:42,633 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:31:42,633 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 156.2ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:42,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:31:42,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 462. [2021-05-22 02:31:42,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1518438177874186) internal successors, (1453), 461 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:42,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1453 transitions. [2021-05-22 02:31:42,637 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1453 transitions. Word has length 21 [2021-05-22 02:31:42,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:42,637 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1453 transitions. [2021-05-22 02:31:42,637 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:42,637 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1453 transitions. [2021-05-22 02:31:42,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:42,638 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:42,638 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:42,838 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4786,853 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:42,838 INFO L430 AbstractCegarLoop]: === Iteration 865 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:42,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:42,839 INFO L82 PathProgramCache]: Analyzing trace with hash -582303487, now seen corresponding path program 853 times [2021-05-22 02:31:42,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:42,839 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771529259] [2021-05-22 02:31:42,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:42,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:42,940 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:42,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:42,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771529259] [2021-05-22 02:31:42,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771529259] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:42,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072481980] [2021-05-22 02:31:42,941 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 854 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 854 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:42,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:42,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:42,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:43,012 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:43,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:43,013 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,022 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,023 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:43,023 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:31:43,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:43,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,072 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:43,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:43,073 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,090 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,093 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:43,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:43,093 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,111 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:43,111 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:22 [2021-05-22 02:31:43,185 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:43,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2072481980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:43,186 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:43,186 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:43,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883780828] [2021-05-22 02:31:43,186 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:43,186 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:43,186 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:43,186 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:43,186 INFO L87 Difference]: Start difference. First operand 462 states and 1453 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:43,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:43,508 INFO L93 Difference]: Finished difference Result 698 states and 2131 transitions. [2021-05-22 02:31:43,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:43,508 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:43,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:43,509 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:31:43,509 INFO L226 Difference]: Without dead ends: 671 [2021-05-22 02:31:43,509 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 264.1ms TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:31:43,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-05-22 02:31:43,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 457. [2021-05-22 02:31:43,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.129385964912281) internal successors, (1427), 456 states have internal predecessors, (1427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:43,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1427 transitions. [2021-05-22 02:31:43,514 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1427 transitions. Word has length 21 [2021-05-22 02:31:43,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:43,515 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1427 transitions. [2021-05-22 02:31:43,515 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:43,515 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1427 transitions. [2021-05-22 02:31:43,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:43,515 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:43,515 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:43,715 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 854 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4791 [2021-05-22 02:31:43,716 INFO L430 AbstractCegarLoop]: === Iteration 866 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:43,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:43,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1805411903, now seen corresponding path program 854 times [2021-05-22 02:31:43,716 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:43,716 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [222376094] [2021-05-22 02:31:43,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:43,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:43,815 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:43,815 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:43,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [222376094] [2021-05-22 02:31:43,816 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [222376094] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:43,816 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [316824589] [2021-05-22 02:31:43,816 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 855 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 855 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:43,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:43,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:43,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:43,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:43,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:43,890 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:43,892 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,906 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,907 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:43,908 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:43,962 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:43,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:43,963 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,969 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,970 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:43,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:43,971 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:43,977 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:43,978 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:31:43,998 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:43,998 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [316824589] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:43,998 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:43,998 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:43,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988168957] [2021-05-22 02:31:43,998 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:43,998 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:43,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:43,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:43,998 INFO L87 Difference]: Start difference. First operand 457 states and 1427 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:44,181 INFO L93 Difference]: Finished difference Result 577 states and 1779 transitions. [2021-05-22 02:31:44,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:44,181 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:44,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:44,182 INFO L225 Difference]: With dead ends: 577 [2021-05-22 02:31:44,182 INFO L226 Difference]: Without dead ends: 555 [2021-05-22 02:31:44,182 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 149.9ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:44,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-22 02:31:44,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 460. [2021-05-22 02:31:44,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1350762527233114) internal successors, (1439), 459 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1439 transitions. [2021-05-22 02:31:44,187 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1439 transitions. Word has length 21 [2021-05-22 02:31:44,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:44,187 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1439 transitions. [2021-05-22 02:31:44,187 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,187 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1439 transitions. [2021-05-22 02:31:44,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:44,187 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:44,187 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:44,388 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 855 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4803 [2021-05-22 02:31:44,388 INFO L430 AbstractCegarLoop]: === Iteration 867 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:44,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:44,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1864231275, now seen corresponding path program 855 times [2021-05-22 02:31:44,388 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:44,388 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528212873] [2021-05-22 02:31:44,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:44,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:44,474 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:44,474 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:44,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528212873] [2021-05-22 02:31:44,474 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528212873] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:44,474 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326621598] [2021-05-22 02:31:44,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 856 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 856 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:44,499 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:44,499 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:44,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:44,500 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:44,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:44,542 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:44,549 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:44,550 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:44,550 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:31:44,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:44,613 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:44,615 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:44,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:44,616 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:44,628 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:44,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:44,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:44,630 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:44,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:44,642 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:44,643 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:31:44,661 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:44,661 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326621598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:44,661 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:44,661 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:44,661 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145667292] [2021-05-22 02:31:44,661 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:44,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:44,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:44,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:44,661 INFO L87 Difference]: Start difference. First operand 460 states and 1439 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:44,848 INFO L93 Difference]: Finished difference Result 570 states and 1749 transitions. [2021-05-22 02:31:44,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:44,849 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:44,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:44,849 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:31:44,849 INFO L226 Difference]: Without dead ends: 543 [2021-05-22 02:31:44,850 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 137.8ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:44,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-22 02:31:44,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 460. [2021-05-22 02:31:44,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.130718954248366) internal successors, (1437), 459 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1437 transitions. [2021-05-22 02:31:44,854 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1437 transitions. Word has length 21 [2021-05-22 02:31:44,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:44,854 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1437 transitions. [2021-05-22 02:31:44,854 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:44,854 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1437 transitions. [2021-05-22 02:31:44,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:44,855 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:44,855 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:45,077 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 856 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4807 [2021-05-22 02:31:45,078 INFO L430 AbstractCegarLoop]: === Iteration 868 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:45,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:45,078 INFO L82 PathProgramCache]: Analyzing trace with hash 2146473337, now seen corresponding path program 856 times [2021-05-22 02:31:45,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:45,078 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198226322] [2021-05-22 02:31:45,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:45,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:45,167 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:45,167 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:45,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198226322] [2021-05-22 02:31:45,167 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198226322] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:45,167 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043686994] [2021-05-22 02:31:45,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 857 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 857 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:45,193 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:45,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:45,194 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:45,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:45,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:45,244 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:45,247 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,261 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:45,262 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:45,263 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:45,336 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_252, v_prenex_253]} [2021-05-22 02:31:45,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:45,340 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:45,351 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:45,352 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:45,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:45,353 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,362 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:45,363 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:45,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:45,364 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,372 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:45,373 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:45,373 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:31:45,402 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:45,402 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1043686994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:45,402 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:45,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:45,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77582520] [2021-05-22 02:31:45,403 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:45,403 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:45,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:45,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:45,403 INFO L87 Difference]: Start difference. First operand 460 states and 1437 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:45,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:45,606 INFO L93 Difference]: Finished difference Result 623 states and 1896 transitions. [2021-05-22 02:31:45,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:31:45,606 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:45,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:45,607 INFO L225 Difference]: With dead ends: 623 [2021-05-22 02:31:45,607 INFO L226 Difference]: Without dead ends: 596 [2021-05-22 02:31:45,607 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 190.4ms TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:45,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2021-05-22 02:31:45,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 473. [2021-05-22 02:31:45,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1271186440677967) internal successors, (1476), 472 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:45,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1476 transitions. [2021-05-22 02:31:45,613 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1476 transitions. Word has length 21 [2021-05-22 02:31:45,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:45,613 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1476 transitions. [2021-05-22 02:31:45,613 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:45,613 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1476 transitions. [2021-05-22 02:31:45,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:45,613 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:45,613 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:45,813 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 857 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4815 [2021-05-22 02:31:45,814 INFO L430 AbstractCegarLoop]: === Iteration 869 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:45,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:45,814 INFO L82 PathProgramCache]: Analyzing trace with hash -462102119, now seen corresponding path program 857 times [2021-05-22 02:31:45,814 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:45,814 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072315255] [2021-05-22 02:31:45,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:45,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:45,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:45,919 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:45,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1072315255] [2021-05-22 02:31:45,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1072315255] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:45,919 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847693823] [2021-05-22 02:31:45,919 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 858 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 858 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:45,945 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:31:45,945 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:45,946 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:45,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:45,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:45,996 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:45,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:45,998 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,012 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,013 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:46,013 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:46,100 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:46,101 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:46,102 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,106 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,108 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:46,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:46,108 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,113 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,113 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,113 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:31:46,143 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:46,143 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847693823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:46,143 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:46,143 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:46,143 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205217926] [2021-05-22 02:31:46,143 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:46,143 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:46,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:46,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:46,144 INFO L87 Difference]: Start difference. First operand 473 states and 1476 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:46,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:46,417 INFO L93 Difference]: Finished difference Result 632 states and 1936 transitions. [2021-05-22 02:31:46,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:46,418 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:46,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:46,418 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:31:46,418 INFO L226 Difference]: Without dead ends: 611 [2021-05-22 02:31:46,419 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 234.5ms TimeCoverageRelationStatistics Valid=71, Invalid=349, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:46,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2021-05-22 02:31:46,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 463. [2021-05-22 02:31:46,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1363636363636362) internal successors, (1449), 462 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:46,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1449 transitions. [2021-05-22 02:31:46,423 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1449 transitions. Word has length 21 [2021-05-22 02:31:46,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:46,424 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1449 transitions. [2021-05-22 02:31:46,424 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:46,424 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1449 transitions. [2021-05-22 02:31:46,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:46,424 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:46,424 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:46,624 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 858 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4828 [2021-05-22 02:31:46,625 INFO L430 AbstractCegarLoop]: === Iteration 870 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:46,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:46,625 INFO L82 PathProgramCache]: Analyzing trace with hash -439597747, now seen corresponding path program 858 times [2021-05-22 02:31:46,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:46,625 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1266460271] [2021-05-22 02:31:46,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:46,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:46,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:46,727 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:46,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1266460271] [2021-05-22 02:31:46,727 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1266460271] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:46,727 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470898067] [2021-05-22 02:31:46,727 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 859 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 859 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:46,753 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:31:46,753 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:46,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:46,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:46,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:46,802 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:46,805 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,819 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,820 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:46,820 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:46,854 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_254, v_prenex_255]} [2021-05-22 02:31:46,857 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:46,857 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,870 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:46,871 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:46,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:46,872 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,883 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,885 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:46,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:46,886 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:46,896 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:46,896 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:46,896 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:21 [2021-05-22 02:31:46,937 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:46,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470898067] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:46,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:46,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:46,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255134532] [2021-05-22 02:31:46,937 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:46,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:46,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:46,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:46,937 INFO L87 Difference]: Start difference. First operand 463 states and 1449 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:47,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:47,102 INFO L93 Difference]: Finished difference Result 595 states and 1838 transitions. [2021-05-22 02:31:47,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:47,103 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:47,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:47,104 INFO L225 Difference]: With dead ends: 595 [2021-05-22 02:31:47,104 INFO L226 Difference]: Without dead ends: 566 [2021-05-22 02:31:47,104 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 161.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:47,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2021-05-22 02:31:47,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 463. [2021-05-22 02:31:47,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1363636363636362) internal successors, (1449), 462 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:47,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1449 transitions. [2021-05-22 02:31:47,109 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1449 transitions. Word has length 21 [2021-05-22 02:31:47,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:47,109 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1449 transitions. [2021-05-22 02:31:47,109 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:47,109 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1449 transitions. [2021-05-22 02:31:47,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:47,109 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:47,109 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:47,310 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 859 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4836 [2021-05-22 02:31:47,310 INFO L430 AbstractCegarLoop]: === Iteration 871 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:47,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:47,310 INFO L82 PathProgramCache]: Analyzing trace with hash -142331337, now seen corresponding path program 859 times [2021-05-22 02:31:47,310 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:47,310 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1363965037] [2021-05-22 02:31:47,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:47,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:47,420 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:47,420 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:47,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1363965037] [2021-05-22 02:31:47,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1363965037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:47,420 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707569164] [2021-05-22 02:31:47,420 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 860 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 860 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:47,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:47,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:47,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:47,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:47,490 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:47,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:47,498 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:47,498 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:31:47,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:47,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:47,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:47,533 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:47,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:47,536 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:47,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:47,553 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:47,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:47,554 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:47,568 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:47,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:47,569 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:65, output treesize:19 [2021-05-22 02:31:47,641 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:47,641 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [707569164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:47,641 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:47,641 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:47,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [110670766] [2021-05-22 02:31:47,641 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:47,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:47,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:47,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:47,641 INFO L87 Difference]: Start difference. First operand 463 states and 1449 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:48,013 INFO L93 Difference]: Finished difference Result 732 states and 2246 transitions. [2021-05-22 02:31:48,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:31:48,013 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:48,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:48,014 INFO L225 Difference]: With dead ends: 732 [2021-05-22 02:31:48,014 INFO L226 Difference]: Without dead ends: 709 [2021-05-22 02:31:48,015 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 331.0ms TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:31:48,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2021-05-22 02:31:48,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 462. [2021-05-22 02:31:48,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1453362255965294) internal successors, (1450), 461 states have internal predecessors, (1450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1450 transitions. [2021-05-22 02:31:48,020 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1450 transitions. Word has length 21 [2021-05-22 02:31:48,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:48,020 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1450 transitions. [2021-05-22 02:31:48,020 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,020 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1450 transitions. [2021-05-22 02:31:48,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:48,020 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:48,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:48,221 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4842,860 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:48,221 INFO L430 AbstractCegarLoop]: === Iteration 872 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:48,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:48,221 INFO L82 PathProgramCache]: Analyzing trace with hash -426594021, now seen corresponding path program 860 times [2021-05-22 02:31:48,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:48,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944710175] [2021-05-22 02:31:48,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:48,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:48,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:48,332 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:48,332 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944710175] [2021-05-22 02:31:48,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944710175] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:48,333 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1464609841] [2021-05-22 02:31:48,333 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 861 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 861 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:48,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:48,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:48,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:48,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:48,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:48,424 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:48,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:48,427 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:48,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:48,442 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:48,442 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:48,479 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_256, v_prenex_257]} [2021-05-22 02:31:48,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:48,482 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:48,494 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:48,494 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:31:48,496 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:48,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:48,497 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:48,508 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:48,510 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:48,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:48,510 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:48,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:48,521 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:48,521 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:31:48,596 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:48,596 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1464609841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:48,596 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:48,596 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:48,596 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094004538] [2021-05-22 02:31:48,596 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:48,596 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:48,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:48,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:48,597 INFO L87 Difference]: Start difference. First operand 462 states and 1450 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:48,910 INFO L93 Difference]: Finished difference Result 688 states and 2101 transitions. [2021-05-22 02:31:48,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:31:48,911 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:48,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:48,912 INFO L225 Difference]: With dead ends: 688 [2021-05-22 02:31:48,912 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:31:48,912 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 266.7ms TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:48,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:31:48,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 473. [2021-05-22 02:31:48,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1483050847457625) internal successors, (1486), 472 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1486 transitions. [2021-05-22 02:31:48,917 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1486 transitions. Word has length 21 [2021-05-22 02:31:48,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:48,917 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1486 transitions. [2021-05-22 02:31:48,917 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:48,917 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1486 transitions. [2021-05-22 02:31:48,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:48,918 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:48,918 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:49,118 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4849,861 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:49,118 INFO L430 AbstractCegarLoop]: === Iteration 873 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:49,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:49,118 INFO L82 PathProgramCache]: Analyzing trace with hash 1649095769, now seen corresponding path program 861 times [2021-05-22 02:31:49,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:49,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874394719] [2021-05-22 02:31:49,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:49,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:49,224 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:49,224 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:49,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874394719] [2021-05-22 02:31:49,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874394719] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:49,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [642497440] [2021-05-22 02:31:49,224 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 862 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 862 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:49,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:31:49,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:49,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:49,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:49,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:49,302 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:49,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:49,305 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:49,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:49,321 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:49,321 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:31:49,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:49,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:49,384 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:49,392 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:49,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:49,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:49,395 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:49,400 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:49,401 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:49,401 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:31:49,446 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:49,446 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [642497440] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:49,446 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:49,446 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:49,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424624877] [2021-05-22 02:31:49,446 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:49,446 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:49,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:49,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:49,447 INFO L87 Difference]: Start difference. First operand 473 states and 1486 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:49,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:49,709 INFO L93 Difference]: Finished difference Result 637 states and 1957 transitions. [2021-05-22 02:31:49,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:49,709 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:49,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:49,710 INFO L225 Difference]: With dead ends: 637 [2021-05-22 02:31:49,710 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:31:49,711 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 212.2ms TimeCoverageRelationStatistics Valid=66, Invalid=314, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:31:49,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:31:49,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 456. [2021-05-22 02:31:49,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1274725274725275) internal successors, (1423), 455 states have internal predecessors, (1423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:49,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1423 transitions. [2021-05-22 02:31:49,715 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1423 transitions. Word has length 21 [2021-05-22 02:31:49,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:49,716 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1423 transitions. [2021-05-22 02:31:49,716 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:49,716 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1423 transitions. [2021-05-22 02:31:49,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:49,716 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:49,716 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:49,916 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4862,862 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:49,917 INFO L430 AbstractCegarLoop]: === Iteration 874 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:49,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:49,917 INFO L82 PathProgramCache]: Analyzing trace with hash 323402135, now seen corresponding path program 862 times [2021-05-22 02:31:49,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:49,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727678736] [2021-05-22 02:31:49,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:49,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:50,005 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:50,005 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:50,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727678736] [2021-05-22 02:31:50,005 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727678736] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:50,005 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1623529061] [2021-05-22 02:31:50,005 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 863 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 863 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:50,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:50,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:50,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:50,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:50,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:50,094 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,096 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:50,096 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,110 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,111 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:50,111 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:31:50,200 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:50,202 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,208 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:50,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,217 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,218 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,218 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:31:50,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:50,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1623529061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:50,226 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:50,226 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:50,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739864880] [2021-05-22 02:31:50,226 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:50,226 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:50,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:50,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:50,227 INFO L87 Difference]: Start difference. First operand 456 states and 1423 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:50,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:50,381 INFO L93 Difference]: Finished difference Result 549 states and 1693 transitions. [2021-05-22 02:31:50,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:50,382 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:50,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:50,383 INFO L225 Difference]: With dead ends: 549 [2021-05-22 02:31:50,383 INFO L226 Difference]: Without dead ends: 527 [2021-05-22 02:31:50,383 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 161.7ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:50,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-05-22 02:31:50,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 467. [2021-05-22 02:31:50,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1394849785407724) internal successors, (1463), 466 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:50,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1463 transitions. [2021-05-22 02:31:50,387 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1463 transitions. Word has length 21 [2021-05-22 02:31:50,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:50,387 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1463 transitions. [2021-05-22 02:31:50,387 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:50,387 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1463 transitions. [2021-05-22 02:31:50,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:50,388 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:50,388 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:50,588 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4867,863 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:50,588 INFO L430 AbstractCegarLoop]: === Iteration 875 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:50,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:50,589 INFO L82 PathProgramCache]: Analyzing trace with hash -178389201, now seen corresponding path program 863 times [2021-05-22 02:31:50,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:50,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902924177] [2021-05-22 02:31:50,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:50,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:50,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:50,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:50,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902924177] [2021-05-22 02:31:50,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902924177] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:50,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109916591] [2021-05-22 02:31:50,672 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 864 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 864 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:50,698 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:31:50,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:50,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:50,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:50,758 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,759 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:50,760 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:50,763 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,777 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:50,777 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:31:50,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,867 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:50,868 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,878 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,880 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:50,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:50,881 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,890 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:50,892 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:50,892 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:12 [2021-05-22 02:31:50,908 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:50,908 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109916591] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:50,908 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:50,908 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:50,909 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441919980] [2021-05-22 02:31:50,909 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:50,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:50,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:50,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:50,909 INFO L87 Difference]: Start difference. First operand 467 states and 1463 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:51,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:51,090 INFO L93 Difference]: Finished difference Result 558 states and 1717 transitions. [2021-05-22 02:31:51,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:51,090 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:51,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:51,091 INFO L225 Difference]: With dead ends: 558 [2021-05-22 02:31:51,091 INFO L226 Difference]: Without dead ends: 536 [2021-05-22 02:31:51,091 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 141.3ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:51,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 536 states. [2021-05-22 02:31:51,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 536 to 464. [2021-05-22 02:31:51,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1339092872570196) internal successors, (1451), 463 states have internal predecessors, (1451), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:51,096 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1451 transitions. [2021-05-22 02:31:51,096 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1451 transitions. Word has length 21 [2021-05-22 02:31:51,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:51,096 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1451 transitions. [2021-05-22 02:31:51,096 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:51,096 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1451 transitions. [2021-05-22 02:31:51,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:51,097 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:51,097 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:51,297 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 864 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4874 [2021-05-22 02:31:51,297 INFO L430 AbstractCegarLoop]: === Iteration 876 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:51,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:51,297 INFO L82 PathProgramCache]: Analyzing trace with hash 948726253, now seen corresponding path program 864 times [2021-05-22 02:31:51,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:51,298 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [380444930] [2021-05-22 02:31:51,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:51,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:51,403 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:51,403 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:51,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [380444930] [2021-05-22 02:31:51,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [380444930] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:51,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493425823] [2021-05-22 02:31:51,403 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 865 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 865 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:51,429 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:51,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:51,430 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:51,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:51,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:51,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:51,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:51,483 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:51,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:51,486 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:51,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:51,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:51,505 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:31:51,620 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:51,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:51,621 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:51,628 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:51,630 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:51,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:51,630 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:51,637 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:51,638 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:51,638 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:31:51,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:51,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493425823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:51,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:51,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:51,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274456873] [2021-05-22 02:31:51,665 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:51,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:51,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:51,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:51,666 INFO L87 Difference]: Start difference. First operand 464 states and 1451 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:52,012 INFO L93 Difference]: Finished difference Result 661 states and 2032 transitions. [2021-05-22 02:31:52,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:31:52,013 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:52,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:52,013 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:31:52,014 INFO L226 Difference]: Without dead ends: 642 [2021-05-22 02:31:52,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 325.6ms TimeCoverageRelationStatistics Valid=95, Invalid=367, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:52,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 642 states. [2021-05-22 02:31:52,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 642 to 474. [2021-05-22 02:31:52,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1501057082452433) internal successors, (1490), 473 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1490 transitions. [2021-05-22 02:31:52,019 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1490 transitions. Word has length 21 [2021-05-22 02:31:52,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:52,019 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1490 transitions. [2021-05-22 02:31:52,019 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,019 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1490 transitions. [2021-05-22 02:31:52,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:52,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:52,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:52,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 865 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4881 [2021-05-22 02:31:52,220 INFO L430 AbstractCegarLoop]: === Iteration 877 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:52,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:52,220 INFO L82 PathProgramCache]: Analyzing trace with hash 726517641, now seen corresponding path program 865 times [2021-05-22 02:31:52,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:52,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888959585] [2021-05-22 02:31:52,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:52,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:52,309 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:52,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:52,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888959585] [2021-05-22 02:31:52,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888959585] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:52,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29501388] [2021-05-22 02:31:52,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 866 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 866 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:52,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:52,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:52,335 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:52,377 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:52,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:52,378 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:52,386 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:52,387 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:52,387 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:31:52,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:52,488 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:52,489 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:52,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:52,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:52,492 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:52,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:52,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:52,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:52,506 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:52,516 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:52,517 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:52,517 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:51, output treesize:5 [2021-05-22 02:31:52,543 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:52,543 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29501388] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:52,543 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:52,543 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:52,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822837592] [2021-05-22 02:31:52,544 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:52,544 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:52,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:52,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:52,544 INFO L87 Difference]: Start difference. First operand 474 states and 1490 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:52,836 INFO L93 Difference]: Finished difference Result 767 states and 2342 transitions. [2021-05-22 02:31:52,836 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:31:52,837 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:52,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:52,838 INFO L225 Difference]: With dead ends: 767 [2021-05-22 02:31:52,838 INFO L226 Difference]: Without dead ends: 707 [2021-05-22 02:31:52,838 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 223.6ms TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:52,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 707 states. [2021-05-22 02:31:52,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 707 to 474. [2021-05-22 02:31:52,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.13953488372093) internal successors, (1485), 473 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1485 transitions. [2021-05-22 02:31:52,843 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1485 transitions. Word has length 21 [2021-05-22 02:31:52,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:52,843 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1485 transitions. [2021-05-22 02:31:52,843 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:52,843 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1485 transitions. [2021-05-22 02:31:52,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:52,844 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:52,844 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:53,044 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4891,866 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:53,044 INFO L430 AbstractCegarLoop]: === Iteration 878 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:53,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:53,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1659849203, now seen corresponding path program 866 times [2021-05-22 02:31:53,044 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:53,044 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589734073] [2021-05-22 02:31:53,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:53,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:53,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:53,144 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:53,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589734073] [2021-05-22 02:31:53,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589734073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:53,144 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136433460] [2021-05-22 02:31:53,144 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 867 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 867 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:53,170 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:53,171 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:53,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:53,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:53,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:53,224 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:53,226 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:53,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:53,227 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:53,244 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:53,245 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:53,246 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:31:53,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:53,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:53,339 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:53,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:53,340 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:53,354 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:53,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:53,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:53,357 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:53,371 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:53,372 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:53,372 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:31:53,419 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:53,419 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [136433460] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:53,419 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:53,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:53,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451316362] [2021-05-22 02:31:53,420 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:53,420 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:53,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:53,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:53,420 INFO L87 Difference]: Start difference. First operand 474 states and 1485 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:53,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:53,693 INFO L93 Difference]: Finished difference Result 769 states and 2345 transitions. [2021-05-22 02:31:53,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:53,694 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:53,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:53,695 INFO L225 Difference]: With dead ends: 769 [2021-05-22 02:31:53,695 INFO L226 Difference]: Without dead ends: 746 [2021-05-22 02:31:53,695 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 271.0ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:53,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 746 states. [2021-05-22 02:31:53,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 746 to 478. [2021-05-22 02:31:53,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.138364779874214) internal successors, (1497), 477 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:53,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1497 transitions. [2021-05-22 02:31:53,700 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1497 transitions. Word has length 21 [2021-05-22 02:31:53,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:53,700 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1497 transitions. [2021-05-22 02:31:53,700 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:53,700 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1497 transitions. [2021-05-22 02:31:53,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:53,701 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:53,701 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:53,901 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4901,867 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:53,901 INFO L430 AbstractCegarLoop]: === Iteration 879 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:53,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:53,902 INFO L82 PathProgramCache]: Analyzing trace with hash 636989711, now seen corresponding path program 867 times [2021-05-22 02:31:53,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:53,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154878291] [2021-05-22 02:31:53,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:53,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:53,999 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:53,999 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:54,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154878291] [2021-05-22 02:31:54,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154878291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:54,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [184320601] [2021-05-22 02:31:54,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 868 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 868 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:54,025 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:31:54,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:54,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:54,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:54,087 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,088 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:54,089 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:54,091 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,108 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:54,110 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:54,110 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:31:54,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:54,182 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,190 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:54,192 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:54,193 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,200 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:54,201 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,201 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:31:54,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:54,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [184320601] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:54,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:54,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:54,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525192605] [2021-05-22 02:31:54,243 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:54,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:54,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:54,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:54,243 INFO L87 Difference]: Start difference. First operand 478 states and 1497 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:54,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:54,546 INFO L93 Difference]: Finished difference Result 669 states and 2051 transitions. [2021-05-22 02:31:54,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:31:54,547 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:54,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:54,547 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:31:54,547 INFO L226 Difference]: Without dead ends: 650 [2021-05-22 02:31:54,548 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 276.7ms TimeCoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:54,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2021-05-22 02:31:54,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 474. [2021-05-22 02:31:54,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.13107822410148) internal successors, (1481), 473 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:54,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1481 transitions. [2021-05-22 02:31:54,553 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1481 transitions. Word has length 21 [2021-05-22 02:31:54,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:54,553 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1481 transitions. [2021-05-22 02:31:54,553 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:54,553 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1481 transitions. [2021-05-22 02:31:54,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:54,553 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:54,553 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:54,754 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4913,868 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:54,754 INFO L430 AbstractCegarLoop]: === Iteration 880 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:54,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:54,754 INFO L82 PathProgramCache]: Analyzing trace with hash -1091972177, now seen corresponding path program 868 times [2021-05-22 02:31:54,754 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:54,754 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245933143] [2021-05-22 02:31:54,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:54,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:54,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:54,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:54,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245933143] [2021-05-22 02:31:54,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245933143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:54,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382858598] [2021-05-22 02:31:54,840 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 869 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 869 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:54,866 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:54,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:54,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:54,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:54,928 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,928 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:54,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:54,929 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:54,932 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:54,945 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:54,947 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:54,947 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:31:55,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:55,031 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,033 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:55,033 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:55,034 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:55,050 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:55,050 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:55,051 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:55,065 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:55,065 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:31:55,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:55,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382858598] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:55,091 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:55,091 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:31:55,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883645014] [2021-05-22 02:31:55,092 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:31:55,092 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:55,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:31:55,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:55,092 INFO L87 Difference]: Start difference. First operand 474 states and 1481 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:55,268 INFO L93 Difference]: Finished difference Result 604 states and 1865 transitions. [2021-05-22 02:31:55,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:55,268 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:55,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:55,269 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:31:55,269 INFO L226 Difference]: Without dead ends: 575 [2021-05-22 02:31:55,269 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 163.1ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:55,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-05-22 02:31:55,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 474. [2021-05-22 02:31:55,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.13107822410148) internal successors, (1481), 473 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1481 transitions. [2021-05-22 02:31:55,274 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1481 transitions. Word has length 21 [2021-05-22 02:31:55,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:55,274 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1481 transitions. [2021-05-22 02:31:55,274 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,274 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1481 transitions. [2021-05-22 02:31:55,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:55,275 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:55,275 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:55,475 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 869 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4917 [2021-05-22 02:31:55,475 INFO L430 AbstractCegarLoop]: === Iteration 881 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:55,475 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:55,476 INFO L82 PathProgramCache]: Analyzing trace with hash 2108296201, now seen corresponding path program 869 times [2021-05-22 02:31:55,476 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:55,476 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1764864555] [2021-05-22 02:31:55,476 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:55,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:55,563 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:55,563 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:55,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1764864555] [2021-05-22 02:31:55,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1764864555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:55,563 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [351983911] [2021-05-22 02:31:55,563 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 870 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 870 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:55,589 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:55,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:55,590 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:55,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:55,634 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:55,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:55,635 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:55,644 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:55,644 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:31:55,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:55,721 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,723 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:55,723 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:55,724 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,738 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:55,740 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:55,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:55,741 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:55,754 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:55,755 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:55,755 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:31:55,773 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:55,773 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [351983911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:55,773 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:55,773 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:55,773 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549135875] [2021-05-22 02:31:55,773 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:55,773 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:55,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:55,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:55,773 INFO L87 Difference]: Start difference. First operand 474 states and 1481 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:55,949 INFO L93 Difference]: Finished difference Result 567 states and 1748 transitions. [2021-05-22 02:31:55,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:55,950 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:55,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:55,950 INFO L225 Difference]: With dead ends: 567 [2021-05-22 02:31:55,950 INFO L226 Difference]: Without dead ends: 540 [2021-05-22 02:31:55,951 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 153.5ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:31:55,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-22 02:31:55,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 471. [2021-05-22 02:31:55,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1340425531914895) internal successors, (1473), 470 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1473 transitions. [2021-05-22 02:31:55,955 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1473 transitions. Word has length 21 [2021-05-22 02:31:55,955 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:55,955 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1473 transitions. [2021-05-22 02:31:55,955 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:55,955 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1473 transitions. [2021-05-22 02:31:55,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:55,956 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:55,956 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:56,156 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 870 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4929 [2021-05-22 02:31:56,156 INFO L430 AbstractCegarLoop]: === Iteration 882 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:56,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:56,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1484010437, now seen corresponding path program 870 times [2021-05-22 02:31:56,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:56,157 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901412314] [2021-05-22 02:31:56,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:56,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:56,239 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:56,239 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:56,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901412314] [2021-05-22 02:31:56,239 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901412314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:56,239 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1053622610] [2021-05-22 02:31:56,240 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 871 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 871 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:56,265 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:31:56,266 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:56,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:56,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:56,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:56,326 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:56,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:56,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:56,330 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,343 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:56,344 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:56,344 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:31:56,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:56,387 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:56,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:56,390 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,406 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:56,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:56,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:31:56,409 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,425 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:56,426 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:56,427 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:31:56,459 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:56,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1053622610] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:56,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:56,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:31:56,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655890862] [2021-05-22 02:31:56,460 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:31:56,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:56,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:31:56,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:56,460 INFO L87 Difference]: Start difference. First operand 471 states and 1473 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:56,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:56,610 INFO L93 Difference]: Finished difference Result 607 states and 1873 transitions. [2021-05-22 02:31:56,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:56,610 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:56,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:56,611 INFO L225 Difference]: With dead ends: 607 [2021-05-22 02:31:56,611 INFO L226 Difference]: Without dead ends: 578 [2021-05-22 02:31:56,611 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 140.7ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:56,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-05-22 02:31:56,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 471. [2021-05-22 02:31:56,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1340425531914895) internal successors, (1473), 470 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:56,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1473 transitions. [2021-05-22 02:31:56,615 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1473 transitions. Word has length 21 [2021-05-22 02:31:56,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:56,615 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1473 transitions. [2021-05-22 02:31:56,616 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:56,616 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1473 transitions. [2021-05-22 02:31:56,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:56,616 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:56,616 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:56,816 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 871 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4936 [2021-05-22 02:31:56,817 INFO L430 AbstractCegarLoop]: === Iteration 883 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:56,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:56,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1781276847, now seen corresponding path program 871 times [2021-05-22 02:31:56,817 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:56,817 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1767565335] [2021-05-22 02:31:56,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:56,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:56,909 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:56,909 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:56,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1767565335] [2021-05-22 02:31:56,909 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1767565335] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:56,909 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017440224] [2021-05-22 02:31:56,910 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 872 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 872 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:56,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:56,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:56,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:56,985 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:56,986 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:56,988 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:56,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:56,989 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,006 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,007 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:31:57,007 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:31:57,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:31:57,054 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,056 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,057 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:57,057 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,076 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:57,077 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,093 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,094 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:57,094 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:31:57,117 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:57,117 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017440224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:57,117 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:57,117 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:31:57,117 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916653198] [2021-05-22 02:31:57,118 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:31:57,118 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:57,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:31:57,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:31:57,118 INFO L87 Difference]: Start difference. First operand 471 states and 1473 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:57,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:57,297 INFO L93 Difference]: Finished difference Result 666 states and 2035 transitions. [2021-05-22 02:31:57,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:31:57,298 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:57,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:57,299 INFO L225 Difference]: With dead ends: 666 [2021-05-22 02:31:57,299 INFO L226 Difference]: Without dead ends: 643 [2021-05-22 02:31:57,299 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 153.2ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:31:57,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-22 02:31:57,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 475. [2021-05-22 02:31:57,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.151898734177215) internal successors, (1494), 474 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:57,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1494 transitions. [2021-05-22 02:31:57,304 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1494 transitions. Word has length 21 [2021-05-22 02:31:57,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:57,304 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1494 transitions. [2021-05-22 02:31:57,304 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:57,304 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1494 transitions. [2021-05-22 02:31:57,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:57,305 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:57,305 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:57,505 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4945,872 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:57,505 INFO L430 AbstractCegarLoop]: === Iteration 884 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:57,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:57,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1497014163, now seen corresponding path program 872 times [2021-05-22 02:31:57,505 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:57,505 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1323706645] [2021-05-22 02:31:57,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:57,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:57,601 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:57,601 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:57,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1323706645] [2021-05-22 02:31:57,601 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1323706645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:57,601 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2026260461] [2021-05-22 02:31:57,602 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 873 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 873 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:57,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:31:57,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:57,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:57,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:57,670 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,671 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:57,671 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,680 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:57,680 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:31:57,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,728 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:57,728 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:31:57,731 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,750 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:57,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:57,751 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:57,766 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:57,768 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:31:57,768 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:31:57,841 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:57,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2026260461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:57,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:57,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:57,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [456284152] [2021-05-22 02:31:57,841 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:57,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:57,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:57,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:57,842 INFO L87 Difference]: Start difference. First operand 475 states and 1494 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:58,083 INFO L93 Difference]: Finished difference Result 659 states and 2030 transitions. [2021-05-22 02:31:58,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:31:58,083 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:58,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:58,084 INFO L225 Difference]: With dead ends: 659 [2021-05-22 02:31:58,084 INFO L226 Difference]: Without dead ends: 632 [2021-05-22 02:31:58,084 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 211.7ms TimeCoverageRelationStatistics Valid=80, Invalid=340, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:31:58,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-22 02:31:58,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 473. [2021-05-22 02:31:58,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.141949152542373) internal successors, (1483), 472 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1483 transitions. [2021-05-22 02:31:58,089 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1483 transitions. Word has length 21 [2021-05-22 02:31:58,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:58,089 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1483 transitions. [2021-05-22 02:31:58,089 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,090 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1483 transitions. [2021-05-22 02:31:58,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:58,090 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:58,090 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:58,290 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4952,873 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:58,295 INFO L430 AbstractCegarLoop]: === Iteration 885 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:58,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:58,296 INFO L82 PathProgramCache]: Analyzing trace with hash 72903839, now seen corresponding path program 873 times [2021-05-22 02:31:58,296 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:58,296 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [836313361] [2021-05-22 02:31:58,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:58,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:58,395 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:58,395 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:58,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [836313361] [2021-05-22 02:31:58,395 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [836313361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:58,395 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [131314973] [2021-05-22 02:31:58,396 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 874 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 874 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:58,421 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:31:58,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:58,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:58,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:58,484 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:58,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:58,485 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:58,492 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:58,493 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:58,493 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:31:58,561 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:58,561 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:58,562 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:58,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:58,571 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:58,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:58,571 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:58,578 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:58,579 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:58,579 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:31:58,605 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:58,606 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [131314973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:58,606 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:58,606 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:58,606 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893484838] [2021-05-22 02:31:58,606 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:58,606 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:58,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:58,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:58,606 INFO L87 Difference]: Start difference. First operand 473 states and 1483 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:58,872 INFO L93 Difference]: Finished difference Result 676 states and 2071 transitions. [2021-05-22 02:31:58,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:31:58,873 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:58,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:58,873 INFO L225 Difference]: With dead ends: 676 [2021-05-22 02:31:58,873 INFO L226 Difference]: Without dead ends: 657 [2021-05-22 02:31:58,874 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 296.9ms TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:58,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-05-22 02:31:58,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 477. [2021-05-22 02:31:58,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1407563025210083) internal successors, (1495), 476 states have internal predecessors, (1495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1495 transitions. [2021-05-22 02:31:58,879 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1495 transitions. Word has length 21 [2021-05-22 02:31:58,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:58,879 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1495 transitions. [2021-05-22 02:31:58,879 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:58,879 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1495 transitions. [2021-05-22 02:31:58,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:58,879 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:58,880 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:59,080 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4964,874 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:59,080 INFO L430 AbstractCegarLoop]: === Iteration 886 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:59,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:59,080 INFO L82 PathProgramCache]: Analyzing trace with hash -1960732641, now seen corresponding path program 874 times [2021-05-22 02:31:59,080 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:59,080 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1911349811] [2021-05-22 02:31:59,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:59,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:59,189 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:59,189 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:59,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1911349811] [2021-05-22 02:31:59,189 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1911349811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:59,189 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1199949870] [2021-05-22 02:31:59,189 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 875 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 875 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:59,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:31:59,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:31:59,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:31:59,214 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:31:59,292 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:59,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:31:59,293 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:59,300 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:59,301 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:31:59,301 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:31:59,340 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:59,341 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:31:59,341 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:59,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:59,351 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:31:59,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:31:59,352 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:31:59,359 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:31:59,360 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:31:59,360 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:31:59,401 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:59,401 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1199949870] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:59,401 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:31:59,402 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:31:59,402 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1696722943] [2021-05-22 02:31:59,402 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:31:59,402 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:31:59,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:31:59,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:31:59,402 INFO L87 Difference]: Start difference. First operand 477 states and 1495 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:59,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:31:59,674 INFO L93 Difference]: Finished difference Result 662 states and 2034 transitions. [2021-05-22 02:31:59,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:31:59,675 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:31:59,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:31:59,675 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:31:59,675 INFO L226 Difference]: Without dead ends: 643 [2021-05-22 02:31:59,675 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 309.5ms TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:31:59,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-22 02:31:59,679 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 464. [2021-05-22 02:31:59,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.125269978401728) internal successors, (1447), 463 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:59,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1447 transitions. [2021-05-22 02:31:59,680 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1447 transitions. Word has length 21 [2021-05-22 02:31:59,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:31:59,680 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1447 transitions. [2021-05-22 02:31:59,680 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:31:59,681 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1447 transitions. [2021-05-22 02:31:59,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:31:59,681 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:31:59,681 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:31:59,881 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 875 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable4970 [2021-05-22 02:31:59,881 INFO L430 AbstractCegarLoop]: === Iteration 887 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:31:59,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:31:59,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1342470473, now seen corresponding path program 875 times [2021-05-22 02:31:59,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:31:59,882 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12588994] [2021-05-22 02:31:59,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:31:59,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:31:59,974 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:31:59,975 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:31:59,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12588994] [2021-05-22 02:31:59,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12588994] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:31:59,975 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019692878] [2021-05-22 02:31:59,975 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 876 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 876 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:31:59,999 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:00,000 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:00,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:32:00,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:00,065 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:00,067 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,073 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,075 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:00,075 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:32:00,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,101 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:00,102 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,105 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:00,106 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:00,138 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:00,141 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,168 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,169 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:00,170 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:93, output treesize:31 [2021-05-22 02:32:00,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:00,241 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019692878] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:00,241 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:00,241 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:00,241 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [161643024] [2021-05-22 02:32:00,241 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:00,241 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:00,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:00,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:00,241 INFO L87 Difference]: Start difference. First operand 464 states and 1447 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:00,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:00,445 INFO L93 Difference]: Finished difference Result 542 states and 1671 transitions. [2021-05-22 02:32:00,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:32:00,445 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:00,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:00,446 INFO L225 Difference]: With dead ends: 542 [2021-05-22 02:32:00,446 INFO L226 Difference]: Without dead ends: 523 [2021-05-22 02:32:00,446 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 230.8ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:32:00,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-22 02:32:00,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 460. [2021-05-22 02:32:00,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1263616557734206) internal successors, (1435), 459 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:00,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1435 transitions. [2021-05-22 02:32:00,451 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1435 transitions. Word has length 21 [2021-05-22 02:32:00,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:00,451 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1435 transitions. [2021-05-22 02:32:00,451 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:00,451 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1435 transitions. [2021-05-22 02:32:00,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:00,451 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:00,451 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:00,652 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4972,876 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:00,652 INFO L430 AbstractCegarLoop]: === Iteration 888 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:00,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:00,652 INFO L82 PathProgramCache]: Analyzing trace with hash 894285847, now seen corresponding path program 876 times [2021-05-22 02:32:00,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:00,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959581717] [2021-05-22 02:32:00,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:00,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:00,735 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:00,735 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:00,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959581717] [2021-05-22 02:32:00,735 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959581717] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:00,735 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2076633785] [2021-05-22 02:32:00,736 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 877 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 877 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:00,760 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:00,760 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:00,761 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:00,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:00,829 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:00,830 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,836 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,837 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:00,837 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:28 [2021-05-22 02:32:00,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,882 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:32:00,883 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:32:00,885 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,899 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:00,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:00,902 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:00,915 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:00,916 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:00,916 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:32:00,933 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:00,933 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2076633785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:00,933 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:00,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:00,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904086617] [2021-05-22 02:32:00,933 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:00,933 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:00,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:00,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:00,933 INFO L87 Difference]: Start difference. First operand 460 states and 1435 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:01,079 INFO L93 Difference]: Finished difference Result 563 states and 1733 transitions. [2021-05-22 02:32:01,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:01,079 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:01,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:01,080 INFO L225 Difference]: With dead ends: 563 [2021-05-22 02:32:01,080 INFO L226 Difference]: Without dead ends: 527 [2021-05-22 02:32:01,080 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 132.8ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:01,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2021-05-22 02:32:01,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 460. [2021-05-22 02:32:01,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1263616557734206) internal successors, (1435), 459 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1435 transitions. [2021-05-22 02:32:01,085 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1435 transitions. Word has length 21 [2021-05-22 02:32:01,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:01,085 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1435 transitions. [2021-05-22 02:32:01,085 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,085 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1435 transitions. [2021-05-22 02:32:01,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:01,085 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:01,085 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:01,286 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4977,877 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:01,286 INFO L430 AbstractCegarLoop]: === Iteration 889 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:01,286 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:01,286 INFO L82 PathProgramCache]: Analyzing trace with hash -200413071, now seen corresponding path program 877 times [2021-05-22 02:32:01,286 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:01,287 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [664117603] [2021-05-22 02:32:01,287 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:01,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:01,369 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:01,370 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:01,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [664117603] [2021-05-22 02:32:01,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [664117603] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:01,370 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042969142] [2021-05-22 02:32:01,370 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 878 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 878 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:01,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:01,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:01,396 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:01,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:01,471 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:01,473 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:01,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:01,474 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:01,484 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:01,485 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:01,485 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:01,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:01,524 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:01,526 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:01,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:01,527 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:01,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:01,542 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:01,543 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:01,543 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:01,557 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:01,558 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:01,558 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:32:01,586 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:01,587 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2042969142] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:01,587 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:01,587 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:01,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349623141] [2021-05-22 02:32:01,587 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:01,587 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:01,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:01,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:01,587 INFO L87 Difference]: Start difference. First operand 460 states and 1435 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:01,772 INFO L93 Difference]: Finished difference Result 604 states and 1852 transitions. [2021-05-22 02:32:01,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:32:01,772 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:01,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:01,773 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:32:01,773 INFO L226 Difference]: Without dead ends: 577 [2021-05-22 02:32:01,773 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 173.2ms TimeCoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:01,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 577 states. [2021-05-22 02:32:01,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 577 to 475. [2021-05-22 02:32:01,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1244725738396624) internal successors, (1481), 474 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1481 transitions. [2021-05-22 02:32:01,778 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1481 transitions. Word has length 21 [2021-05-22 02:32:01,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:01,778 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1481 transitions. [2021-05-22 02:32:01,778 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:01,778 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1481 transitions. [2021-05-22 02:32:01,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:01,779 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:01,779 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:01,979 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4983,878 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:01,979 INFO L430 AbstractCegarLoop]: === Iteration 890 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:01,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:01,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1680339867, now seen corresponding path program 878 times [2021-05-22 02:32:01,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:01,980 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964058019] [2021-05-22 02:32:01,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:01,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:02,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:02,063 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:02,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964058019] [2021-05-22 02:32:02,063 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964058019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:02,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1162904795] [2021-05-22 02:32:02,063 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 879 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 879 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:02,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:02,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:02,089 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:02,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:02,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:02,167 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,168 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:02,169 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,180 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,181 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:02,181 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:02,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:02,233 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:02,243 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,249 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,250 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,250 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:02,260 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:02,260 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1162904795] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:02,260 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:02,260 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:02,260 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1229566910] [2021-05-22 02:32:02,260 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:02,260 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:02,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:02,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:02,261 INFO L87 Difference]: Start difference. First operand 475 states and 1481 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:02,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:02,389 INFO L93 Difference]: Finished difference Result 554 states and 1699 transitions. [2021-05-22 02:32:02,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:02,389 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:02,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:02,390 INFO L225 Difference]: With dead ends: 554 [2021-05-22 02:32:02,390 INFO L226 Difference]: Without dead ends: 533 [2021-05-22 02:32:02,390 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 149.4ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:02,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2021-05-22 02:32:02,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 457. [2021-05-22 02:32:02,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.129385964912281) internal successors, (1427), 456 states have internal predecessors, (1427), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:02,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1427 transitions. [2021-05-22 02:32:02,395 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1427 transitions. Word has length 21 [2021-05-22 02:32:02,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:02,395 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1427 transitions. [2021-05-22 02:32:02,395 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:02,395 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1427 transitions. [2021-05-22 02:32:02,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:02,395 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:02,395 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:02,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4994,879 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:02,596 INFO L430 AbstractCegarLoop]: === Iteration 891 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:02,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:02,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1962334387, now seen corresponding path program 879 times [2021-05-22 02:32:02,596 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:02,596 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [941985040] [2021-05-22 02:32:02,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:02,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:02,681 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:02,681 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:02,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [941985040] [2021-05-22 02:32:02,681 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [941985040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:02,681 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515801159] [2021-05-22 02:32:02,681 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 880 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 880 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:02,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:02,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:02,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:02,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:02,751 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:02,752 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,760 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,761 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:02,761 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:31 [2021-05-22 02:32:02,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:32:02,808 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:32:02,811 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:02,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:02,831 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:02,847 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:02,848 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:02,848 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:21 [2021-05-22 02:32:02,882 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:02,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515801159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:02,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:02,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:02,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173976020] [2021-05-22 02:32:02,882 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:02,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:02,882 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:02,882 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:02,882 INFO L87 Difference]: Start difference. First operand 457 states and 1427 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:03,019 INFO L93 Difference]: Finished difference Result 578 states and 1773 transitions. [2021-05-22 02:32:03,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:03,019 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:03,019 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:03,020 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:32:03,020 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:32:03,020 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 135.8ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:03,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:32:03,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 458. [2021-05-22 02:32:03,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1334792122538295) internal successors, (1432), 457 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1432 transitions. [2021-05-22 02:32:03,025 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1432 transitions. Word has length 21 [2021-05-22 02:32:03,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:03,025 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1432 transitions. [2021-05-22 02:32:03,025 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,025 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1432 transitions. [2021-05-22 02:32:03,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:03,025 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:03,025 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:03,226 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 880 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5000 [2021-05-22 02:32:03,226 INFO L430 AbstractCegarLoop]: === Iteration 892 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:03,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:03,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1665067977, now seen corresponding path program 880 times [2021-05-22 02:32:03,226 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:03,226 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420176480] [2021-05-22 02:32:03,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:03,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:03,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:03,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:03,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420176480] [2021-05-22 02:32:03,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420176480] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:03,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1264774974] [2021-05-22 02:32:03,310 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 881 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 881 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:03,335 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:03,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:03,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:03,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:03,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:03,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:03,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:03,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:03,394 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:03,411 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:03,412 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:03,413 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:03,455 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:03,456 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:03,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:03,457 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:03,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:03,460 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:03,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:03,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:03,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:03,483 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:03,499 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:03,500 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:03,500 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:32:03,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:03,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1264774974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:03,523 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:03,523 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:32:03,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663195778] [2021-05-22 02:32:03,523 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:32:03,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:03,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:32:03,523 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:03,523 INFO L87 Difference]: Start difference. First operand 458 states and 1432 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:03,714 INFO L93 Difference]: Finished difference Result 663 states and 2025 transitions. [2021-05-22 02:32:03,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:03,715 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:03,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:03,716 INFO L225 Difference]: With dead ends: 663 [2021-05-22 02:32:03,716 INFO L226 Difference]: Without dead ends: 640 [2021-05-22 02:32:03,716 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 144.5ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:03,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-05-22 02:32:03,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 473. [2021-05-22 02:32:03,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1504237288135593) internal successors, (1487), 472 states have internal predecessors, (1487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1487 transitions. [2021-05-22 02:32:03,721 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1487 transitions. Word has length 21 [2021-05-22 02:32:03,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:03,721 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1487 transitions. [2021-05-22 02:32:03,721 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:03,721 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1487 transitions. [2021-05-22 02:32:03,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:03,722 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:03,722 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:03,922 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5006,881 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:03,922 INFO L430 AbstractCegarLoop]: === Iteration 893 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:03,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:03,923 INFO L82 PathProgramCache]: Analyzing trace with hash -1949330661, now seen corresponding path program 881 times [2021-05-22 02:32:03,923 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:03,923 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572583919] [2021-05-22 02:32:03,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:03,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:04,023 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:04,023 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:04,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572583919] [2021-05-22 02:32:04,023 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572583919] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:04,023 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343962636] [2021-05-22 02:32:04,023 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 882 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 882 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:04,049 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:04,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:04,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:32:04,050 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:04,110 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:04,112 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,114 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:04,114 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,128 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:04,129 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:04,129 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:04,172 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,172 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:04,173 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:04,177 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:04,181 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,183 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:04,184 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,228 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:04,231 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:04,233 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,235 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:04,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:04,236 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:04,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:04,280 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:32:04,280 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 4 variables, input treesize:149, output treesize:57 [2021-05-22 02:32:04,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:04,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343962636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:04,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:04,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:04,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979431877] [2021-05-22 02:32:04,397 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:04,397 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:04,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:04,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:04,398 INFO L87 Difference]: Start difference. First operand 473 states and 1487 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:04,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:04,996 INFO L93 Difference]: Finished difference Result 787 states and 2411 transitions. [2021-05-22 02:32:04,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:32:04,996 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:04,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:04,997 INFO L225 Difference]: With dead ends: 787 [2021-05-22 02:32:04,997 INFO L226 Difference]: Without dead ends: 739 [2021-05-22 02:32:04,997 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 540.3ms TimeCoverageRelationStatistics Valid=124, Invalid=526, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:32:04,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 739 states. [2021-05-22 02:32:05,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 739 to 491. [2021-05-22 02:32:05,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.157142857142857) internal successors, (1547), 490 states have internal predecessors, (1547), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:05,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1547 transitions. [2021-05-22 02:32:05,003 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1547 transitions. Word has length 21 [2021-05-22 02:32:05,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:05,003 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1547 transitions. [2021-05-22 02:32:05,003 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:05,003 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1547 transitions. [2021-05-22 02:32:05,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:05,004 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:05,004 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:05,204 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 882 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5013 [2021-05-22 02:32:05,204 INFO L430 AbstractCegarLoop]: === Iteration 894 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:05,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:05,205 INFO L82 PathProgramCache]: Analyzing trace with hash 384889669, now seen corresponding path program 882 times [2021-05-22 02:32:05,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:05,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1420264668] [2021-05-22 02:32:05,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:05,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:05,309 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:05,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:05,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1420264668] [2021-05-22 02:32:05,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1420264668] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:05,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [269225296] [2021-05-22 02:32:05,310 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 883 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 883 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:05,335 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:05,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:05,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:05,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:05,386 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:05,387 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:05,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:05,388 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:05,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:05,390 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:05,408 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:05,409 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:05,409 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:05,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:05,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:05,464 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:05,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:05,474 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:05,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:05,475 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:05,483 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:05,483 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:05,483 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:32:05,528 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:05,528 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [269225296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:05,528 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:05,528 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:05,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25025331] [2021-05-22 02:32:05,528 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:05,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:05,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:05,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:05,529 INFO L87 Difference]: Start difference. First operand 491 states and 1547 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:05,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:05,795 INFO L93 Difference]: Finished difference Result 669 states and 2060 transitions. [2021-05-22 02:32:05,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:32:05,795 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:05,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:05,796 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:32:05,796 INFO L226 Difference]: Without dead ends: 650 [2021-05-22 02:32:05,796 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 253.9ms TimeCoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:05,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 650 states. [2021-05-22 02:32:05,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 650 to 477. [2021-05-22 02:32:05,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1470588235294117) internal successors, (1498), 476 states have internal predecessors, (1498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:05,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1498 transitions. [2021-05-22 02:32:05,802 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1498 transitions. Word has length 21 [2021-05-22 02:32:05,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:05,802 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1498 transitions. [2021-05-22 02:32:05,802 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:05,802 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1498 transitions. [2021-05-22 02:32:05,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:05,802 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:05,802 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:06,003 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5027,883 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:06,003 INFO L430 AbstractCegarLoop]: === Iteration 895 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:06,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:06,003 INFO L82 PathProgramCache]: Analyzing trace with hash 930262323, now seen corresponding path program 883 times [2021-05-22 02:32:06,003 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:06,003 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [731718464] [2021-05-22 02:32:06,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:06,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:06,089 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:06,089 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:06,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [731718464] [2021-05-22 02:32:06,089 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [731718464] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:06,089 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [144429431] [2021-05-22 02:32:06,089 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 884 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 884 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:06,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:06,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:06,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:06,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:06,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:06,179 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,193 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,194 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:06,194 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:06,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:06,290 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,298 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,299 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:06,300 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,307 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,308 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,308 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:06,317 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:06,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [144429431] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:06,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:06,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:06,318 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50866302] [2021-05-22 02:32:06,318 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:06,318 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:06,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:06,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:06,318 INFO L87 Difference]: Start difference. First operand 477 states and 1498 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:06,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:06,498 INFO L93 Difference]: Finished difference Result 585 states and 1788 transitions. [2021-05-22 02:32:06,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:06,498 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:06,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:06,499 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:32:06,499 INFO L226 Difference]: Without dead ends: 564 [2021-05-22 02:32:06,499 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 186.4ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:06,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2021-05-22 02:32:06,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 473. [2021-05-22 02:32:06,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1483050847457625) internal successors, (1486), 472 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:06,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1486 transitions. [2021-05-22 02:32:06,504 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1486 transitions. Word has length 21 [2021-05-22 02:32:06,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:06,504 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1486 transitions. [2021-05-22 02:32:06,504 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:06,504 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1486 transitions. [2021-05-22 02:32:06,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:06,504 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:06,504 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:06,705 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5031,884 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:06,705 INFO L430 AbstractCegarLoop]: === Iteration 896 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:06,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:06,705 INFO L82 PathProgramCache]: Analyzing trace with hash -788722359, now seen corresponding path program 884 times [2021-05-22 02:32:06,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:06,705 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555661478] [2021-05-22 02:32:06,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:06,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:06,805 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:06,805 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:06,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555661478] [2021-05-22 02:32:06,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555661478] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:06,805 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773970268] [2021-05-22 02:32:06,805 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 885 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 885 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:06,831 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:06,831 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:06,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:06,832 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:06,891 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:06,892 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,894 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:06,895 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,910 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:06,910 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:06,963 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:06,965 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:06,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:06,976 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,983 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:06,984 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:06,984 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:10 [2021-05-22 02:32:07,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:07,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773970268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:07,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:07,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:07,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930004169] [2021-05-22 02:32:07,029 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:07,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:07,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:07,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:07,029 INFO L87 Difference]: Start difference. First operand 473 states and 1486 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:07,310 INFO L93 Difference]: Finished difference Result 643 states and 1974 transitions. [2021-05-22 02:32:07,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:07,310 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:07,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:07,311 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:32:07,311 INFO L226 Difference]: Without dead ends: 622 [2021-05-22 02:32:07,311 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 219.0ms TimeCoverageRelationStatistics Valid=71, Invalid=309, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:32:07,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-05-22 02:32:07,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 456. [2021-05-22 02:32:07,315 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1274725274725275) internal successors, (1423), 455 states have internal predecessors, (1423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1423 transitions. [2021-05-22 02:32:07,316 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1423 transitions. Word has length 21 [2021-05-22 02:32:07,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:07,317 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1423 transitions. [2021-05-22 02:32:07,317 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,317 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1423 transitions. [2021-05-22 02:32:07,317 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:07,317 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:07,317 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:07,520 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 885 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5040 [2021-05-22 02:32:07,520 INFO L430 AbstractCegarLoop]: === Iteration 897 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:07,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:07,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1952062537, now seen corresponding path program 885 times [2021-05-22 02:32:07,521 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:07,521 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546118304] [2021-05-22 02:32:07,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:07,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:07,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:07,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:07,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546118304] [2021-05-22 02:32:07,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546118304] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:07,610 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1737470163] [2021-05-22 02:32:07,610 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 886 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 886 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:07,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:07,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:07,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:07,635 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:07,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:07,685 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:07,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:07,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:07,702 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:07,703 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:07,703 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:07,757 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:07,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:07,758 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:07,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:07,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:07,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:07,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:07,771 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:07,772 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:07,772 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:12 [2021-05-22 02:32:07,785 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:07,785 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1737470163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:07,785 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:07,785 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:07,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1688233567] [2021-05-22 02:32:07,785 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:07,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:07,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:07,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:07,785 INFO L87 Difference]: Start difference. First operand 456 states and 1423 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:07,939 INFO L93 Difference]: Finished difference Result 542 states and 1672 transitions. [2021-05-22 02:32:07,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:07,939 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:07,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:07,940 INFO L225 Difference]: With dead ends: 542 [2021-05-22 02:32:07,940 INFO L226 Difference]: Without dead ends: 520 [2021-05-22 02:32:07,940 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 136.9ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:07,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2021-05-22 02:32:07,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 462. [2021-05-22 02:32:07,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1323210412147504) internal successors, (1444), 461 states have internal predecessors, (1444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1444 transitions. [2021-05-22 02:32:07,950 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1444 transitions. Word has length 21 [2021-05-22 02:32:07,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:07,950 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1444 transitions. [2021-05-22 02:32:07,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:07,950 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1444 transitions. [2021-05-22 02:32:07,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:07,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:07,951 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:08,151 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 886 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5046 [2021-05-22 02:32:08,151 INFO L430 AbstractCegarLoop]: === Iteration 898 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:08,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:08,152 INFO L82 PathProgramCache]: Analyzing trace with hash -1326738419, now seen corresponding path program 886 times [2021-05-22 02:32:08,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:08,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [327431705] [2021-05-22 02:32:08,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:08,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:08,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:08,251 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:08,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [327431705] [2021-05-22 02:32:08,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [327431705] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:08,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448190778] [2021-05-22 02:32:08,251 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 887 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 887 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:08,276 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:08,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:08,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:08,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:08,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:08,319 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:08,326 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:08,327 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:08,327 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:32:08,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:08,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:08,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:08,392 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:08,394 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:08,395 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:08,407 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:08,409 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:08,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:08,409 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:08,421 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:08,422 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:08,422 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:55, output treesize:13 [2021-05-22 02:32:08,468 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:08,468 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1448190778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:08,468 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:08,468 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:08,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415791863] [2021-05-22 02:32:08,468 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:08,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:08,468 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:08,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:08,469 INFO L87 Difference]: Start difference. First operand 462 states and 1444 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:08,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:08,739 INFO L93 Difference]: Finished difference Result 626 states and 1930 transitions. [2021-05-22 02:32:08,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:32:08,739 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:08,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:08,740 INFO L225 Difference]: With dead ends: 626 [2021-05-22 02:32:08,740 INFO L226 Difference]: Without dead ends: 599 [2021-05-22 02:32:08,740 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 233.9ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:08,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-22 02:32:08,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 462. [2021-05-22 02:32:08,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.1279826464208242) internal successors, (1442), 461 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:08,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1442 transitions. [2021-05-22 02:32:08,745 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1442 transitions. Word has length 21 [2021-05-22 02:32:08,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:08,745 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1442 transitions. [2021-05-22 02:32:08,745 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:08,745 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1442 transitions. [2021-05-22 02:32:08,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:08,745 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:08,745 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:08,946 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 887 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5051 [2021-05-22 02:32:08,946 INFO L430 AbstractCegarLoop]: === Iteration 899 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:08,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:08,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1611001103, now seen corresponding path program 887 times [2021-05-22 02:32:08,946 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:08,946 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2071655758] [2021-05-22 02:32:08,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:08,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:09,048 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:09,048 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:09,048 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2071655758] [2021-05-22 02:32:09,049 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2071655758] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:09,049 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [671713242] [2021-05-22 02:32:09,049 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 888 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 888 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:09,074 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:09,075 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:09,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:09,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:09,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:09,122 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,124 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:09,125 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:09,140 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:09,140 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:09,216 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_258, v_prenex_259], 1=[o_0, o_2]} [2021-05-22 02:32:09,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:09,219 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,229 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:09,229 INFO L518 ElimStorePlain]: Eliminatee v_prenex_259 vanished before elimination [2021-05-22 02:32:09,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:09,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:09,232 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,240 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:09,242 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:09,242 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:09,242 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,250 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:09,251 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:09,251 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:32:09,300 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:09,300 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [671713242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:09,300 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:09,300 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:09,300 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939194174] [2021-05-22 02:32:09,300 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:09,300 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:09,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:09,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:09,301 INFO L87 Difference]: Start difference. First operand 462 states and 1442 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:09,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:09,544 INFO L93 Difference]: Finished difference Result 684 states and 2097 transitions. [2021-05-22 02:32:09,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:09,545 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:09,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:09,546 INFO L225 Difference]: With dead ends: 684 [2021-05-22 02:32:09,546 INFO L226 Difference]: Without dead ends: 657 [2021-05-22 02:32:09,546 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 226.1ms TimeCoverageRelationStatistics Valid=72, Invalid=348, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:09,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-05-22 02:32:09,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 476. [2021-05-22 02:32:09,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.126315789473684) internal successors, (1485), 475 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:09,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1485 transitions. [2021-05-22 02:32:09,551 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1485 transitions. Word has length 21 [2021-05-22 02:32:09,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:09,551 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1485 transitions. [2021-05-22 02:32:09,551 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:09,551 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1485 transitions. [2021-05-22 02:32:09,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:09,552 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:09,552 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:09,752 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5059,888 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:09,752 INFO L430 AbstractCegarLoop]: === Iteration 900 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:09,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:09,752 INFO L82 PathProgramCache]: Analyzing trace with hash 75390737, now seen corresponding path program 888 times [2021-05-22 02:32:09,752 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:09,752 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2051646318] [2021-05-22 02:32:09,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:09,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:09,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:09,855 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:09,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2051646318] [2021-05-22 02:32:09,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2051646318] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:09,855 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735707851] [2021-05-22 02:32:09,856 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 889 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 889 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:09,881 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:09,881 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:09,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:09,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:09,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:09,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:09,952 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:09,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:09,967 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:09,968 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:10,058 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:10,058 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:10,059 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,065 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:10,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:10,066 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,070 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,071 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,071 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:32:10,100 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:10,100 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735707851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:10,100 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:10,100 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:10,100 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433093681] [2021-05-22 02:32:10,100 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:10,100 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:10,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:10,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:10,101 INFO L87 Difference]: Start difference. First operand 476 states and 1485 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:10,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:10,350 INFO L93 Difference]: Finished difference Result 644 states and 1974 transitions. [2021-05-22 02:32:10,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:10,350 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:10,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:10,351 INFO L225 Difference]: With dead ends: 644 [2021-05-22 02:32:10,351 INFO L226 Difference]: Without dead ends: 623 [2021-05-22 02:32:10,351 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 238.2ms TimeCoverageRelationStatistics Valid=70, Invalid=350, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:10,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2021-05-22 02:32:10,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 477. [2021-05-22 02:32:10,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.134453781512605) internal successors, (1492), 476 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:10,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1492 transitions. [2021-05-22 02:32:10,356 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1492 transitions. Word has length 21 [2021-05-22 02:32:10,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:10,356 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1492 transitions. [2021-05-22 02:32:10,356 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:10,357 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1492 transitions. [2021-05-22 02:32:10,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:10,357 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:10,357 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:10,557 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5074,889 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:10,558 INFO L430 AbstractCegarLoop]: === Iteration 901 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:10,558 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:10,558 INFO L82 PathProgramCache]: Analyzing trace with hash 97895109, now seen corresponding path program 889 times [2021-05-22 02:32:10,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:10,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1043628063] [2021-05-22 02:32:10,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:10,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:10,645 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:10,645 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:10,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1043628063] [2021-05-22 02:32:10,645 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1043628063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:10,645 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922745112] [2021-05-22 02:32:10,645 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 890 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 890 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:10,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:10,671 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:10,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:10,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:10,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:10,722 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,737 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:10,738 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:10,770 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_2], 1=[v_prenex_260, v_prenex_261]} [2021-05-22 02:32:10,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:10,773 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,786 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:10,787 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:10,788 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:10,788 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,799 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:10,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:10,802 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:10,820 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:10,820 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:10,821 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:21 [2021-05-22 02:32:10,853 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:10,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [922745112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:10,854 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:10,854 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:10,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1939689283] [2021-05-22 02:32:10,854 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:10,854 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:10,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:10,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:10,854 INFO L87 Difference]: Start difference. First operand 477 states and 1492 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:10,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:10,999 INFO L93 Difference]: Finished difference Result 604 states and 1867 transitions. [2021-05-22 02:32:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:10,999 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:10,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:11,000 INFO L225 Difference]: With dead ends: 604 [2021-05-22 02:32:11,000 INFO L226 Difference]: Without dead ends: 575 [2021-05-22 02:32:11,000 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 138.7ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:11,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-05-22 02:32:11,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 477. [2021-05-22 02:32:11,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.134453781512605) internal successors, (1492), 476 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:11,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1492 transitions. [2021-05-22 02:32:11,005 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1492 transitions. Word has length 21 [2021-05-22 02:32:11,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:11,006 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1492 transitions. [2021-05-22 02:32:11,006 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:11,006 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1492 transitions. [2021-05-22 02:32:11,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:11,006 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:11,006 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:11,206 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 890 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5084 [2021-05-22 02:32:11,207 INFO L430 AbstractCegarLoop]: === Iteration 902 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:11,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:11,207 INFO L82 PathProgramCache]: Analyzing trace with hash 395161519, now seen corresponding path program 890 times [2021-05-22 02:32:11,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:11,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564849254] [2021-05-22 02:32:11,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:11,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:11,308 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:11,308 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:11,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564849254] [2021-05-22 02:32:11,308 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564849254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:11,308 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933234773] [2021-05-22 02:32:11,308 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 891 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 891 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:11,333 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:11,334 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:11,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:11,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:11,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:11,375 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:11,382 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:11,383 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:11,383 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:31 [2021-05-22 02:32:11,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:11,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:11,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:11,418 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:11,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:11,421 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:11,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:11,438 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:11,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:11,439 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:11,453 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:11,454 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:11,454 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:65, output treesize:19 [2021-05-22 02:32:11,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:11,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [933234773] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:11,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:11,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:11,525 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510391164] [2021-05-22 02:32:11,525 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:11,525 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:11,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:11,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:11,525 INFO L87 Difference]: Start difference. First operand 477 states and 1492 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:11,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:11,789 INFO L93 Difference]: Finished difference Result 648 states and 1997 transitions. [2021-05-22 02:32:11,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:11,789 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:11,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:11,790 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:32:11,790 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:32:11,790 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 289.1ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:11,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:32:11,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 476. [2021-05-22 02:32:11,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.143157894736842) internal successors, (1493), 475 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:11,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1493 transitions. [2021-05-22 02:32:11,795 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1493 transitions. Word has length 21 [2021-05-22 02:32:11,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:11,795 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1493 transitions. [2021-05-22 02:32:11,795 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:11,795 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1493 transitions. [2021-05-22 02:32:11,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:11,796 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:11,796 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:11,996 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5091,891 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:11,996 INFO L430 AbstractCegarLoop]: === Iteration 903 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:11,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:11,997 INFO L82 PathProgramCache]: Analyzing trace with hash 110898835, now seen corresponding path program 891 times [2021-05-22 02:32:11,997 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:11,997 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684941134] [2021-05-22 02:32:11,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:11,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:12,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:12,102 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:12,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684941134] [2021-05-22 02:32:12,102 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684941134] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:12,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [170276730] [2021-05-22 02:32:12,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 892 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 892 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:12,126 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:12,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:12,127 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:12,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:12,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:12,174 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:12,177 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,191 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:12,192 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:12,192 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:12,234 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_262, v_prenex_263], 1=[o_0, o_2]} [2021-05-22 02:32:12,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:12,237 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,249 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:12,249 INFO L518 ElimStorePlain]: Eliminatee v_prenex_263 vanished before elimination [2021-05-22 02:32:12,251 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:12,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:12,252 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,263 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:12,264 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:12,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:12,265 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,275 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:12,276 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:12,276 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:32:12,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:12,350 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [170276730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:12,350 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:12,350 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:12,350 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867725391] [2021-05-22 02:32:12,350 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:12,350 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:12,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:12,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:12,350 INFO L87 Difference]: Start difference. First operand 476 states and 1493 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:12,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:12,562 INFO L93 Difference]: Finished difference Result 708 states and 2159 transitions. [2021-05-22 02:32:12,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:12,563 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:12,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:12,563 INFO L225 Difference]: With dead ends: 708 [2021-05-22 02:32:12,563 INFO L226 Difference]: Without dead ends: 681 [2021-05-22 02:32:12,564 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 222.0ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:12,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-05-22 02:32:12,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 479. [2021-05-22 02:32:12,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1527196652719667) internal successors, (1507), 478 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:12,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1507 transitions. [2021-05-22 02:32:12,569 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1507 transitions. Word has length 21 [2021-05-22 02:32:12,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:12,569 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1507 transitions. [2021-05-22 02:32:12,569 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:12,569 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1507 transitions. [2021-05-22 02:32:12,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:12,570 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:12,570 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:12,770 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5098,892 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:12,770 INFO L430 AbstractCegarLoop]: === Iteration 904 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:12,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:12,770 INFO L82 PathProgramCache]: Analyzing trace with hash -2108378671, now seen corresponding path program 892 times [2021-05-22 02:32:12,770 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:12,770 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428011119] [2021-05-22 02:32:12,770 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:12,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:12,877 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:12,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:12,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428011119] [2021-05-22 02:32:12,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1428011119] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:12,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205493260] [2021-05-22 02:32:12,877 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 893 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 893 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:12,901 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:12,902 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:12,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:12,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:12,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:12,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:12,952 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:12,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:12,968 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:12,968 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:32:13,019 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:13,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:13,020 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,026 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:13,027 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:13,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:13,028 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,033 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:13,034 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,034 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:32:13,078 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:13,078 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [205493260] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:13,078 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:13,078 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:13,078 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1955245452] [2021-05-22 02:32:13,078 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:13,078 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:13,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:13,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:13,079 INFO L87 Difference]: Start difference. First operand 479 states and 1507 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:13,281 INFO L93 Difference]: Finished difference Result 661 states and 2035 transitions. [2021-05-22 02:32:13,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:13,281 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:13,282 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:32:13,282 INFO L226 Difference]: Without dead ends: 640 [2021-05-22 02:32:13,282 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 207.9ms TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:32:13,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 640 states. [2021-05-22 02:32:13,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 640 to 475. [2021-05-22 02:32:13,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1434599156118144) internal successors, (1490), 474 states have internal predecessors, (1490), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1490 transitions. [2021-05-22 02:32:13,287 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1490 transitions. Word has length 21 [2021-05-22 02:32:13,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:13,287 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1490 transitions. [2021-05-22 02:32:13,287 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,287 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1490 transitions. [2021-05-22 02:32:13,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:13,288 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:13,288 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:13,488 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 893 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5110 [2021-05-22 02:32:13,488 INFO L430 AbstractCegarLoop]: === Iteration 905 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:13,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:13,488 INFO L82 PathProgramCache]: Analyzing trace with hash 1795140053, now seen corresponding path program 893 times [2021-05-22 02:32:13,488 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:13,488 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [638854347] [2021-05-22 02:32:13,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:13,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:13,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:13,578 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:13,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [638854347] [2021-05-22 02:32:13,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [638854347] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:13,578 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419982530] [2021-05-22 02:32:13,578 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 894 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 894 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:13,603 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:32:13,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:13,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:13,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:13,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:13,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:13,644 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,649 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:13,650 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,650 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:25 [2021-05-22 02:32:13,682 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:32:13,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:32:13,685 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:32:13,688 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,702 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:13,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:13,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:13,705 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:13,719 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:13,720 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:13,720 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:21 [2021-05-22 02:32:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:13,753 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419982530] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:13,753 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:13,753 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:13,753 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193492472] [2021-05-22 02:32:13,753 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:13,753 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:13,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:13,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:13,753 INFO L87 Difference]: Start difference. First operand 475 states and 1490 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:13,921 INFO L93 Difference]: Finished difference Result 578 states and 1788 transitions. [2021-05-22 02:32:13,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:13,922 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:13,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:13,922 INFO L225 Difference]: With dead ends: 578 [2021-05-22 02:32:13,923 INFO L226 Difference]: Without dead ends: 542 [2021-05-22 02:32:13,923 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 140.9ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:13,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-05-22 02:32:13,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 476. [2021-05-22 02:32:13,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1473684210526316) internal successors, (1495), 475 states have internal predecessors, (1495), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1495 transitions. [2021-05-22 02:32:13,927 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1495 transitions. Word has length 21 [2021-05-22 02:32:13,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:13,927 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1495 transitions. [2021-05-22 02:32:13,927 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:13,928 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1495 transitions. [2021-05-22 02:32:13,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:13,928 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:13,928 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:14,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5114,894 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:14,129 INFO L430 AbstractCegarLoop]: === Iteration 906 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:14,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:14,129 INFO L82 PathProgramCache]: Analyzing trace with hash 2092406463, now seen corresponding path program 894 times [2021-05-22 02:32:14,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:14,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [853847405] [2021-05-22 02:32:14,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:14,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:14,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:14,223 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:14,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [853847405] [2021-05-22 02:32:14,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [853847405] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:14,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852569092] [2021-05-22 02:32:14,223 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 895 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 895 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:14,249 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:32:14,249 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:14,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:14,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:14,305 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:14,306 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:14,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:14,307 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:14,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:14,310 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:14,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:14,326 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:14,326 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:32:14,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:14,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:14,374 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:14,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:14,375 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:14,391 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:14,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:14,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:14,399 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:14,414 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:14,415 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:14,415 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:66, output treesize:19 [2021-05-22 02:32:14,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:14,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1852569092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:14,488 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:14,488 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:14,488 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087841139] [2021-05-22 02:32:14,488 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:14,488 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:14,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:14,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:14,489 INFO L87 Difference]: Start difference. First operand 476 states and 1495 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:14,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:14,799 INFO L93 Difference]: Finished difference Result 682 states and 2098 transitions. [2021-05-22 02:32:14,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:14,799 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:14,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:14,800 INFO L225 Difference]: With dead ends: 682 [2021-05-22 02:32:14,800 INFO L226 Difference]: Without dead ends: 659 [2021-05-22 02:32:14,800 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 294.4ms TimeCoverageRelationStatistics Valid=95, Invalid=411, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:14,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 659 states. [2021-05-22 02:32:14,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 659 to 491. [2021-05-22 02:32:14,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.163265306122449) internal successors, (1550), 490 states have internal predecessors, (1550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:14,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1550 transitions. [2021-05-22 02:32:14,806 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1550 transitions. Word has length 21 [2021-05-22 02:32:14,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:14,806 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1550 transitions. [2021-05-22 02:32:14,806 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:14,806 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1550 transitions. [2021-05-22 02:32:14,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:14,807 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:14,807 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:15,007 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 895 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5118 [2021-05-22 02:32:15,007 INFO L430 AbstractCegarLoop]: === Iteration 907 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:15,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:15,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1808143779, now seen corresponding path program 895 times [2021-05-22 02:32:15,008 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:15,008 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1295977854] [2021-05-22 02:32:15,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:15,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:15,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:15,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:15,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1295977854] [2021-05-22 02:32:15,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1295977854] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:15,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1540259073] [2021-05-22 02:32:15,122 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 896 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 896 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:15,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:15,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:15,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:15,189 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:15,190 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:15,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:15,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:15,193 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,205 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:15,205 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:15,205 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:15,235 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:32:15,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:15,238 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:15,241 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,255 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:15,257 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:15,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:15,258 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,272 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:15,273 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:15,273 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:19 [2021-05-22 02:32:15,347 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:15,347 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1540259073] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:15,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:15,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:15,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182397301] [2021-05-22 02:32:15,347 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:15,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:15,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:15,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:15,348 INFO L87 Difference]: Start difference. First operand 491 states and 1550 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:15,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:15,560 INFO L93 Difference]: Finished difference Result 709 states and 2187 transitions. [2021-05-22 02:32:15,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:15,560 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:15,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:15,561 INFO L225 Difference]: With dead ends: 709 [2021-05-22 02:32:15,561 INFO L226 Difference]: Without dead ends: 682 [2021-05-22 02:32:15,562 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 228.6ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:15,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-05-22 02:32:15,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 497. [2021-05-22 02:32:15,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.161290322580645) internal successors, (1568), 496 states have internal predecessors, (1568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:15,567 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1568 transitions. [2021-05-22 02:32:15,567 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1568 transitions. Word has length 21 [2021-05-22 02:32:15,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:15,567 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1568 transitions. [2021-05-22 02:32:15,567 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:15,567 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1568 transitions. [2021-05-22 02:32:15,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:15,568 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:15,568 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:15,768 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5127,896 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:15,768 INFO L430 AbstractCegarLoop]: === Iteration 908 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:15,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:15,768 INFO L82 PathProgramCache]: Analyzing trace with hash -152603187, now seen corresponding path program 896 times [2021-05-22 02:32:15,768 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:15,768 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [323265393] [2021-05-22 02:32:15,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:15,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:15,849 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:15,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:15,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [323265393] [2021-05-22 02:32:15,850 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [323265393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:15,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271410974] [2021-05-22 02:32:15,850 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 897 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 897 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:15,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:15,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:15,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:15,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:15,927 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:15,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,930 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:15,930 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:15,931 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:15,945 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:15,946 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:15,946 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:38 [2021-05-22 02:32:16,002 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:16,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:16,003 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,011 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:16,012 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:16,013 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:16,013 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,020 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:16,020 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,020 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:32:16,038 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:16,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271410974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:16,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:16,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:16,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231133193] [2021-05-22 02:32:16,038 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:16,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:16,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:16,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:16,039 INFO L87 Difference]: Start difference. First operand 497 states and 1568 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:16,174 INFO L93 Difference]: Finished difference Result 584 states and 1806 transitions. [2021-05-22 02:32:16,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:16,174 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:16,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:16,175 INFO L225 Difference]: With dead ends: 584 [2021-05-22 02:32:16,175 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:32:16,175 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 139.7ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:16,176 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:32:16,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 481. [2021-05-22 02:32:16,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.154166666666667) internal successors, (1514), 480 states have internal predecessors, (1514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1514 transitions. [2021-05-22 02:32:16,180 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1514 transitions. Word has length 21 [2021-05-22 02:32:16,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:16,180 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1514 transitions. [2021-05-22 02:32:16,180 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,180 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1514 transitions. [2021-05-22 02:32:16,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:16,181 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:16,181 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:16,381 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5138,897 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:16,382 INFO L430 AbstractCegarLoop]: === Iteration 909 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:16,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:16,382 INFO L82 PathProgramCache]: Analyzing trace with hash 392769467, now seen corresponding path program 897 times [2021-05-22 02:32:16,382 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:16,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897781915] [2021-05-22 02:32:16,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:16,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:16,477 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:16,478 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:16,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897781915] [2021-05-22 02:32:16,478 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897781915] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:16,478 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1863859619] [2021-05-22 02:32:16,478 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 898 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 898 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:16,505 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:16,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:16,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:16,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:16,556 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:16,557 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:16,557 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:16,558 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:16,560 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,571 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:16,572 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:16,572 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:16,639 INFO L446 ElimStorePlain]: Different costs {0=[o_4], 1=[o_0]} [2021-05-22 02:32:16,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:16,641 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:16,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:16,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:16,648 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,653 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:16,654 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:16,654 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:32:16,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:16,664 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1863859619] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:16,664 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:16,664 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:16,664 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559435817] [2021-05-22 02:32:16,664 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:16,664 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:16,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:16,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:16,664 INFO L87 Difference]: Start difference. First operand 481 states and 1514 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:16,854 INFO L93 Difference]: Finished difference Result 593 states and 1825 transitions. [2021-05-22 02:32:16,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:16,855 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:16,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:16,856 INFO L225 Difference]: With dead ends: 593 [2021-05-22 02:32:16,856 INFO L226 Difference]: Without dead ends: 572 [2021-05-22 02:32:16,856 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 186.8ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:16,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2021-05-22 02:32:16,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 481. [2021-05-22 02:32:16,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.1625) internal successors, (1518), 480 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1518 transitions. [2021-05-22 02:32:16,861 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1518 transitions. Word has length 21 [2021-05-22 02:32:16,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:16,861 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1518 transitions. [2021-05-22 02:32:16,861 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:16,861 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1518 transitions. [2021-05-22 02:32:16,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:16,861 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:16,861 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:17,062 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5142,898 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:17,062 INFO L430 AbstractCegarLoop]: === Iteration 910 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:17,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:17,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1326215215, now seen corresponding path program 898 times [2021-05-22 02:32:17,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:17,062 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165143954] [2021-05-22 02:32:17,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:17,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:17,155 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:17,155 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:17,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165143954] [2021-05-22 02:32:17,155 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165143954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:17,155 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504339859] [2021-05-22 02:32:17,155 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 899 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 899 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:17,179 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:17,179 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:17,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:17,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:17,250 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_264], 1=[o_2]} [2021-05-22 02:32:17,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:17,254 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:17,267 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:17,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:17,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:17,270 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:17,282 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:17,283 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:17,283 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:32:17,336 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:17,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:17,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:17,344 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:17,346 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:17,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:17,347 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:17,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:17,354 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:17,354 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:32:17,398 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:17,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504339859] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:17,399 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:17,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:17,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1155210048] [2021-05-22 02:32:17,399 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:17,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:17,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:17,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:17,399 INFO L87 Difference]: Start difference. First operand 481 states and 1518 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:17,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:17,709 INFO L93 Difference]: Finished difference Result 673 states and 2072 transitions. [2021-05-22 02:32:17,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:17,710 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:17,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:17,711 INFO L225 Difference]: With dead ends: 673 [2021-05-22 02:32:17,711 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:32:17,711 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 222.8ms TimeCoverageRelationStatistics Valid=69, Invalid=311, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:32:17,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:32:17,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 477. [2021-05-22 02:32:17,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.153361344537815) internal successors, (1501), 476 states have internal predecessors, (1501), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:17,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1501 transitions. [2021-05-22 02:32:17,716 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1501 transitions. Word has length 21 [2021-05-22 02:32:17,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:17,716 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1501 transitions. [2021-05-22 02:32:17,716 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:17,716 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1501 transitions. [2021-05-22 02:32:17,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:17,717 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:17,717 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:17,917 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5148,899 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:17,917 INFO L430 AbstractCegarLoop]: === Iteration 911 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:17,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:17,917 INFO L82 PathProgramCache]: Analyzing trace with hash 70171963, now seen corresponding path program 899 times [2021-05-22 02:32:17,917 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:17,917 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2093444242] [2021-05-22 02:32:17,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:17,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:18,024 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:18,024 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:18,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2093444242] [2021-05-22 02:32:18,024 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2093444242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:18,024 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427138179] [2021-05-22 02:32:18,024 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 900 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 900 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:18,050 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:18,050 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:18,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:18,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:18,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:18,109 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,114 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,116 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:18,116 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:32:18,167 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:18,167 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:18,168 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,173 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,174 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:18,175 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:18,175 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,179 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,180 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,180 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:32:18,210 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:18,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1427138179] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:18,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:18,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:18,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979026554] [2021-05-22 02:32:18,211 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:18,211 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:18,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:18,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:18,211 INFO L87 Difference]: Start difference. First operand 477 states and 1501 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:18,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:18,408 INFO L93 Difference]: Finished difference Result 660 states and 2036 transitions. [2021-05-22 02:32:18,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:18,408 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:18,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:18,409 INFO L225 Difference]: With dead ends: 660 [2021-05-22 02:32:18,409 INFO L226 Difference]: Without dead ends: 639 [2021-05-22 02:32:18,409 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 202.6ms TimeCoverageRelationStatistics Valid=62, Invalid=318, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:32:18,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 639 states. [2021-05-22 02:32:18,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 639 to 479. [2021-05-22 02:32:18,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1506276150627617) internal successors, (1506), 478 states have internal predecessors, (1506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:18,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1506 transitions. [2021-05-22 02:32:18,415 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1506 transitions. Word has length 21 [2021-05-22 02:32:18,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:18,415 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1506 transitions. [2021-05-22 02:32:18,415 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:18,415 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1506 transitions. [2021-05-22 02:32:18,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:18,415 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:18,415 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:18,629 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 900 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5153 [2021-05-22 02:32:18,630 INFO L430 AbstractCegarLoop]: === Iteration 912 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:18,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:18,630 INFO L82 PathProgramCache]: Analyzing trace with hash -1259756199, now seen corresponding path program 900 times [2021-05-22 02:32:18,630 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:18,630 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650724150] [2021-05-22 02:32:18,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:18,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:18,722 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:18,722 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:18,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650724150] [2021-05-22 02:32:18,722 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650724150] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:18,722 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1693594015] [2021-05-22 02:32:18,722 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 901 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 901 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:18,747 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:18,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:18,747 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:18,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:18,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:18,805 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,810 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,812 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:18,812 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:32:18,835 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:18,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:18,836 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,842 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:18,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:18,844 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,850 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:18,850 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:18,850 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:32:18,865 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:18,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1693594015] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:18,865 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:18,865 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:18,865 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487772559] [2021-05-22 02:32:18,865 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:18,865 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:18,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:18,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:18,865 INFO L87 Difference]: Start difference. First operand 479 states and 1506 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:19,005 INFO L93 Difference]: Finished difference Result 574 states and 1774 transitions. [2021-05-22 02:32:19,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:19,006 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:19,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:19,007 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:32:19,007 INFO L226 Difference]: Without dead ends: 553 [2021-05-22 02:32:19,007 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 136.4ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:19,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 553 states. [2021-05-22 02:32:19,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 553 to 476. [2021-05-22 02:32:19,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1452631578947368) internal successors, (1494), 475 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1494 transitions. [2021-05-22 02:32:19,012 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1494 transitions. Word has length 21 [2021-05-22 02:32:19,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:19,012 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1494 transitions. [2021-05-22 02:32:19,012 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,012 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1494 transitions. [2021-05-22 02:32:19,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:19,012 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:19,012 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:19,213 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5159,901 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:19,213 INFO L430 AbstractCegarLoop]: === Iteration 913 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:19,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:19,213 INFO L82 PathProgramCache]: Analyzing trace with hash 2120129609, now seen corresponding path program 901 times [2021-05-22 02:32:19,213 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:19,213 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673559163] [2021-05-22 02:32:19,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:19,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:19,306 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:19,306 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:19,306 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673559163] [2021-05-22 02:32:19,306 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1673559163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:19,307 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2069428884] [2021-05-22 02:32:19,307 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 902 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 902 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:19,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:19,332 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:19,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:19,434 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:19,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:19,435 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:19,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:19,442 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:19,442 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:22 [2021-05-22 02:32:19,467 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:19,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:19,468 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:19,475 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:19,477 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:19,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:19,478 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:19,490 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:19,491 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:19,491 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:32:19,537 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:19,537 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2069428884] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:19,537 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:19,537 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:19,537 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904957549] [2021-05-22 02:32:19,537 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:19,537 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:19,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:19,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:19,538 INFO L87 Difference]: Start difference. First operand 476 states and 1494 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:19,765 INFO L93 Difference]: Finished difference Result 652 states and 2000 transitions. [2021-05-22 02:32:19,766 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:19,766 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:19,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:19,766 INFO L225 Difference]: With dead ends: 652 [2021-05-22 02:32:19,767 INFO L226 Difference]: Without dead ends: 631 [2021-05-22 02:32:19,767 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 205.1ms TimeCoverageRelationStatistics Valid=65, Invalid=315, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:32:19,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-05-22 02:32:19,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 455. [2021-05-22 02:32:19,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 3.1277533039647576) internal successors, (1420), 454 states have internal predecessors, (1420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 1420 transitions. [2021-05-22 02:32:19,771 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 1420 transitions. Word has length 21 [2021-05-22 02:32:19,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:19,772 INFO L482 AbstractCegarLoop]: Abstraction has 455 states and 1420 transitions. [2021-05-22 02:32:19,772 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:19,772 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 1420 transitions. [2021-05-22 02:32:19,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:19,772 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:19,772 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:19,972 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 902 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5161 [2021-05-22 02:32:19,973 INFO L430 AbstractCegarLoop]: === Iteration 914 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:19,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:19,973 INFO L82 PathProgramCache]: Analyzing trace with hash -347218005, now seen corresponding path program 902 times [2021-05-22 02:32:19,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:19,973 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1012491458] [2021-05-22 02:32:19,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:19,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:20,033 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:20,033 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:20,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1012491458] [2021-05-22 02:32:20,034 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1012491458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:20,034 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [961208869] [2021-05-22 02:32:20,034 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 903 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 903 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:20,059 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:20,059 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:20,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:20,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:20,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:20,078 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:20,080 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,086 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:20,087 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:20,087 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:20,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:20,104 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,108 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:20,108 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:20,108 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,108 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:32:20,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:20,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [961208869] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:20,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:20,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:32:20,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683063726] [2021-05-22 02:32:20,121 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:32:20,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:20,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:32:20,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:32:20,121 INFO L87 Difference]: Start difference. First operand 455 states and 1420 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:20,229 INFO L93 Difference]: Finished difference Result 757 states and 2307 transitions. [2021-05-22 02:32:20,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:20,229 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:20,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:20,230 INFO L225 Difference]: With dead ends: 757 [2021-05-22 02:32:20,230 INFO L226 Difference]: Without dead ends: 735 [2021-05-22 02:32:20,230 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 70.8ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:32:20,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 735 states. [2021-05-22 02:32:20,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 735 to 461. [2021-05-22 02:32:20,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.132608695652174) internal successors, (1441), 460 states have internal predecessors, (1441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1441 transitions. [2021-05-22 02:32:20,236 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1441 transitions. Word has length 21 [2021-05-22 02:32:20,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:20,236 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1441 transitions. [2021-05-22 02:32:20,236 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,236 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1441 transitions. [2021-05-22 02:32:20,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:20,236 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:20,236 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:20,437 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5164,903 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:20,437 INFO L430 AbstractCegarLoop]: === Iteration 915 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:20,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:20,437 INFO L82 PathProgramCache]: Analyzing trace with hash -68073609, now seen corresponding path program 903 times [2021-05-22 02:32:20,437 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:20,437 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860565183] [2021-05-22 02:32:20,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:20,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:20,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:20,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:20,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860565183] [2021-05-22 02:32:20,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860565183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:20,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235765657] [2021-05-22 02:32:20,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 904 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 904 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:20,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:20,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:20,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:20,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:20,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:20,555 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,558 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:20,559 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,559 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:32:20,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:20,584 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:20,586 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:20,592 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:20,593 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:20,593 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:20,593 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:32:20,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:20,637 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235765657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:20,637 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:20,637 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:20,637 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638354207] [2021-05-22 02:32:20,637 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:20,637 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:20,637 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:20,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:20,637 INFO L87 Difference]: Start difference. First operand 461 states and 1441 transitions. Second operand has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:20,869 INFO L93 Difference]: Finished difference Result 753 states and 2302 transitions. [2021-05-22 02:32:20,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:32:20,869 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:20,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:20,870 INFO L225 Difference]: With dead ends: 753 [2021-05-22 02:32:20,870 INFO L226 Difference]: Without dead ends: 722 [2021-05-22 02:32:20,870 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 157.6ms TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:32:20,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-05-22 02:32:20,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 464. [2021-05-22 02:32:20,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1295896328293735) internal successors, (1449), 463 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1449 transitions. [2021-05-22 02:32:20,876 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1449 transitions. Word has length 21 [2021-05-22 02:32:20,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:20,876 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1449 transitions. [2021-05-22 02:32:20,876 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.1333333333333333) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:20,876 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1449 transitions. [2021-05-22 02:32:20,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:20,876 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:20,876 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:21,077 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 904 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5167 [2021-05-22 02:32:21,077 INFO L430 AbstractCegarLoop]: === Iteration 916 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:21,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:21,077 INFO L82 PathProgramCache]: Analyzing trace with hash -352336293, now seen corresponding path program 904 times [2021-05-22 02:32:21,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:21,077 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [268028268] [2021-05-22 02:32:21,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:21,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:21,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:21,158 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:21,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [268028268] [2021-05-22 02:32:21,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [268028268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:21,158 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47885849] [2021-05-22 02:32:21,158 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 905 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 905 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:21,183 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:21,183 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:21,183 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:21,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:21,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:21,203 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:21,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:21,205 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:21,211 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:21,212 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:21,212 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:21,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:21,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:21,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:21,263 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:21,269 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:21,270 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:21,270 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:21,270 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:32:21,316 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:21,317 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47885849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:21,317 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:21,317 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:21,317 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297714870] [2021-05-22 02:32:21,317 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:21,317 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:21,317 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:21,317 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:21,317 INFO L87 Difference]: Start difference. First operand 464 states and 1449 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:21,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:21,966 INFO L93 Difference]: Finished difference Result 1164 states and 3567 transitions. [2021-05-22 02:32:21,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-05-22 02:32:21,966 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:21,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:21,968 INFO L225 Difference]: With dead ends: 1164 [2021-05-22 02:32:21,968 INFO L226 Difference]: Without dead ends: 1137 [2021-05-22 02:32:21,968 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 497.2ms TimeCoverageRelationStatistics Valid=198, Invalid=924, Unknown=0, NotChecked=0, Total=1122 [2021-05-22 02:32:21,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1137 states. [2021-05-22 02:32:21,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1137 to 491. [2021-05-22 02:32:21,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.163265306122449) internal successors, (1550), 490 states have internal predecessors, (1550), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:21,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1550 transitions. [2021-05-22 02:32:21,975 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1550 transitions. Word has length 21 [2021-05-22 02:32:21,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:21,975 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1550 transitions. [2021-05-22 02:32:21,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:21,975 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1550 transitions. [2021-05-22 02:32:21,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:21,976 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:21,976 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:22,176 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 905 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5170 [2021-05-22 02:32:22,176 INFO L430 AbstractCegarLoop]: === Iteration 917 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:22,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:22,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1334055547, now seen corresponding path program 905 times [2021-05-22 02:32:22,177 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:22,177 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278072868] [2021-05-22 02:32:22,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:22,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:22,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:22,251 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:22,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278072868] [2021-05-22 02:32:22,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278072868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:22,251 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206264718] [2021-05-22 02:32:22,252 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 906 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 906 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:22,276 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:22,276 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:22,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:22,277 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:22,294 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:22,295 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:22,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:22,298 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:22,304 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:22,304 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:22,304 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:22,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:22,363 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:22,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:22,366 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:22,366 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:22,366 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:32:22,393 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:22,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1206264718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:22,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:22,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:22,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395853139] [2021-05-22 02:32:22,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:22,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:22,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:22,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:22,394 INFO L87 Difference]: Start difference. First operand 491 states and 1550 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:22,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:22,910 INFO L93 Difference]: Finished difference Result 1047 states and 3217 transitions. [2021-05-22 02:32:22,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-22 02:32:22,910 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:22,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:22,911 INFO L225 Difference]: With dead ends: 1047 [2021-05-22 02:32:22,911 INFO L226 Difference]: Without dead ends: 1026 [2021-05-22 02:32:22,911 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 431.4ms TimeCoverageRelationStatistics Valid=183, Invalid=873, Unknown=0, NotChecked=0, Total=1056 [2021-05-22 02:32:22,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1026 states. [2021-05-22 02:32:22,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1026 to 486. [2021-05-22 02:32:22,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.160824742268041) internal successors, (1533), 485 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:22,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1533 transitions. [2021-05-22 02:32:22,918 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1533 transitions. Word has length 21 [2021-05-22 02:32:22,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:22,918 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1533 transitions. [2021-05-22 02:32:22,918 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:22,918 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1533 transitions. [2021-05-22 02:32:22,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:22,919 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:22,919 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:23,119 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5180,906 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:23,119 INFO L430 AbstractCegarLoop]: === Iteration 918 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:23,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:23,119 INFO L82 PathProgramCache]: Analyzing trace with hash -1920675951, now seen corresponding path program 906 times [2021-05-22 02:32:23,120 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:23,120 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [501948926] [2021-05-22 02:32:23,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:23,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:23,192 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:23,192 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:23,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [501948926] [2021-05-22 02:32:23,192 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [501948926] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:23,192 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402266818] [2021-05-22 02:32:23,192 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 907 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 907 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:23,216 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:23,217 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:23,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:23,217 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:23,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:23,236 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:23,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:23,238 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:23,244 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:23,245 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:23,245 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:23,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:23,300 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:23,302 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:23,302 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:23,303 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:23,303 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:32:23,330 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:23,330 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402266818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:23,330 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:23,330 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:23,330 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956337725] [2021-05-22 02:32:23,330 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:23,330 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:23,331 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:23,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:23,331 INFO L87 Difference]: Start difference. First operand 486 states and 1533 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:24,018 INFO L93 Difference]: Finished difference Result 1154 states and 3533 transitions. [2021-05-22 02:32:24,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-22 02:32:24,018 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:24,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:24,020 INFO L225 Difference]: With dead ends: 1154 [2021-05-22 02:32:24,020 INFO L226 Difference]: Without dead ends: 1133 [2021-05-22 02:32:24,020 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 524.4ms TimeCoverageRelationStatistics Valid=265, Invalid=1141, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:32:24,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1133 states. [2021-05-22 02:32:24,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1133 to 484. [2021-05-22 02:32:24,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1635610766045548) internal successors, (1528), 483 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1528 transitions. [2021-05-22 02:32:24,027 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1528 transitions. Word has length 21 [2021-05-22 02:32:24,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:24,027 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1528 transitions. [2021-05-22 02:32:24,027 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,027 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1528 transitions. [2021-05-22 02:32:24,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:24,028 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:24,028 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:24,228 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5186,907 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:24,228 INFO L430 AbstractCegarLoop]: === Iteration 919 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:24,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:24,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1780534143, now seen corresponding path program 907 times [2021-05-22 02:32:24,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:24,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1298432826] [2021-05-22 02:32:24,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:24,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:24,309 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:24,309 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:24,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1298432826] [2021-05-22 02:32:24,309 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1298432826] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:24,309 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271370373] [2021-05-22 02:32:24,309 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 908 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 908 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:24,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:24,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:24,334 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:24,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:24,355 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:24,357 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,363 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:24,364 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:24,364 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:24,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:24,400 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,403 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:24,404 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:24,404 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,404 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:32:24,417 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:24,417 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271370373] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:24,417 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:24,417 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:32:24,417 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [155798998] [2021-05-22 02:32:24,417 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:32:24,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:24,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:32:24,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:32:24,418 INFO L87 Difference]: Start difference. First operand 484 states and 1528 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:24,573 INFO L93 Difference]: Finished difference Result 763 states and 2369 transitions. [2021-05-22 02:32:24,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:24,574 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:24,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:24,575 INFO L225 Difference]: With dead ends: 763 [2021-05-22 02:32:24,575 INFO L226 Difference]: Without dead ends: 741 [2021-05-22 02:32:24,575 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 103.7ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:24,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 741 states. [2021-05-22 02:32:24,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 741 to 486. [2021-05-22 02:32:24,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.160824742268041) internal successors, (1533), 485 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1533 transitions. [2021-05-22 02:32:24,581 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1533 transitions. Word has length 21 [2021-05-22 02:32:24,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:24,581 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1533 transitions. [2021-05-22 02:32:24,581 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:24,581 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1533 transitions. [2021-05-22 02:32:24,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:24,581 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:24,581 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:24,781 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 908 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5192 [2021-05-22 02:32:24,782 INFO L430 AbstractCegarLoop]: === Iteration 920 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:24,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:24,782 INFO L82 PathProgramCache]: Analyzing trace with hash -464475507, now seen corresponding path program 908 times [2021-05-22 02:32:24,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:24,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007137659] [2021-05-22 02:32:24,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:24,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:24,861 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:24,861 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:24,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007137659] [2021-05-22 02:32:24,862 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007137659] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:24,862 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1409951061] [2021-05-22 02:32:24,862 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 909 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 909 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:24,886 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:24,887 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:24,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:24,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:24,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:24,909 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:24,911 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,917 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:24,918 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:24,918 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:32:24,941 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:24,942 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,943 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:24,944 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:24,952 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:24,952 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:24,953 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:24,953 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:32:24,975 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:24,975 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1409951061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:24,975 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:24,975 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:32:24,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755126335] [2021-05-22 02:32:24,975 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:32:24,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:24,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:32:24,975 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:32:24,975 INFO L87 Difference]: Start difference. First operand 486 states and 1533 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:25,152 INFO L93 Difference]: Finished difference Result 777 states and 2407 transitions. [2021-05-22 02:32:25,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:25,153 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:25,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:25,154 INFO L225 Difference]: With dead ends: 777 [2021-05-22 02:32:25,154 INFO L226 Difference]: Without dead ends: 748 [2021-05-22 02:32:25,154 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 116.1ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:25,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-05-22 02:32:25,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 479. [2021-05-22 02:32:25,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1527196652719667) internal successors, (1507), 478 states have internal predecessors, (1507), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1507 transitions. [2021-05-22 02:32:25,160 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1507 transitions. Word has length 21 [2021-05-22 02:32:25,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:25,160 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1507 transitions. [2021-05-22 02:32:25,160 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,160 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1507 transitions. [2021-05-22 02:32:25,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:25,160 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:25,160 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:25,361 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5195,909 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:25,361 INFO L430 AbstractCegarLoop]: === Iteration 921 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:25,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:25,361 INFO L82 PathProgramCache]: Analyzing trace with hash 842409421, now seen corresponding path program 909 times [2021-05-22 02:32:25,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:25,361 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216940902] [2021-05-22 02:32:25,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:25,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:25,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:25,440 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:25,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216940902] [2021-05-22 02:32:25,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216940902] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:25,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966324990] [2021-05-22 02:32:25,440 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 910 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 910 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:25,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:25,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:25,465 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:25,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:25,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:25,499 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:25,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:25,501 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:25,509 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:25,510 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:25,510 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:25,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:25,547 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:25,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:25,550 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:25,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:25,551 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:32:25,564 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:25,564 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [966324990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:25,564 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:25,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:32:25,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346365837] [2021-05-22 02:32:25,564 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:32:25,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:25,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:32:25,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:25,564 INFO L87 Difference]: Start difference. First operand 479 states and 1507 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:25,737 INFO L93 Difference]: Finished difference Result 605 states and 1876 transitions. [2021-05-22 02:32:25,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:25,737 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:25,737 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:25,738 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:32:25,738 INFO L226 Difference]: Without dead ends: 583 [2021-05-22 02:32:25,738 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 113.7ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:25,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-05-22 02:32:25,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 484. [2021-05-22 02:32:25,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1552795031055902) internal successors, (1524), 483 states have internal predecessors, (1524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1524 transitions. [2021-05-22 02:32:25,743 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1524 transitions. Word has length 21 [2021-05-22 02:32:25,743 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:25,743 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1524 transitions. [2021-05-22 02:32:25,743 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:25,743 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1524 transitions. [2021-05-22 02:32:25,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:25,744 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:25,744 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:25,944 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 910 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5199 [2021-05-22 02:32:25,945 INFO L430 AbstractCegarLoop]: === Iteration 922 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:25,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:25,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1467733539, now seen corresponding path program 910 times [2021-05-22 02:32:25,945 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:25,945 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1021524238] [2021-05-22 02:32:25,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:25,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:26,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:26,028 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:26,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1021524238] [2021-05-22 02:32:26,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1021524238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:26,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771996640] [2021-05-22 02:32:26,029 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 911 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 911 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:26,053 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:26,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:26,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:26,054 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:26,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:26,083 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,088 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:26,088 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,088 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:32:26,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:26,126 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:26,128 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:26,134 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:26,134 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:26,134 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:32:26,179 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:26,179 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771996640] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:26,179 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:26,179 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:26,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597305982] [2021-05-22 02:32:26,179 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:26,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:26,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:26,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:26,179 INFO L87 Difference]: Start difference. First operand 484 states and 1524 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:26,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:26,423 INFO L93 Difference]: Finished difference Result 681 states and 2106 transitions. [2021-05-22 02:32:26,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:32:26,424 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:26,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:26,425 INFO L225 Difference]: With dead ends: 681 [2021-05-22 02:32:26,425 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:32:26,425 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 183.2ms TimeCoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-05-22 02:32:26,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:32:26,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 484. [2021-05-22 02:32:26,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1511387163561078) internal successors, (1522), 483 states have internal predecessors, (1522), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:26,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1522 transitions. [2021-05-22 02:32:26,430 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1522 transitions. Word has length 21 [2021-05-22 02:32:26,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:26,430 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1522 transitions. [2021-05-22 02:32:26,430 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:26,430 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1522 transitions. [2021-05-22 02:32:26,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:26,431 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:26,431 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:26,631 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5202,911 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:26,631 INFO L430 AbstractCegarLoop]: === Iteration 923 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:26,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:26,631 INFO L82 PathProgramCache]: Analyzing trace with hash -1402600229, now seen corresponding path program 911 times [2021-05-22 02:32:26,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:26,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638605680] [2021-05-22 02:32:26,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:26,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:26,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:26,709 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:26,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638605680] [2021-05-22 02:32:26,709 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638605680] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:26,709 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1616388314] [2021-05-22 02:32:26,709 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 912 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 912 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:26,734 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:26,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:26,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:26,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:26,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:26,768 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:26,770 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,778 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:26,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:26,779 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:26,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:26,806 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,815 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:26,816 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:26,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:26,818 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:26,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:26,826 INFO L518 ElimStorePlain]: Eliminatee v_prenex_266 vanished before elimination [2021-05-22 02:32:26,827 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:26,827 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:32:26,866 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:26,866 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1616388314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:26,866 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:26,866 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:32:26,866 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153253458] [2021-05-22 02:32:26,866 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:32:26,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:26,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:32:26,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:26,867 INFO L87 Difference]: Start difference. First operand 484 states and 1522 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:27,024 INFO L93 Difference]: Finished difference Result 654 states and 2025 transitions. [2021-05-22 02:32:27,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:27,024 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:27,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:27,025 INFO L225 Difference]: With dead ends: 654 [2021-05-22 02:32:27,025 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:32:27,025 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 122.5ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:27,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:32:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 485. [2021-05-22 02:32:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.15702479338843) internal successors, (1528), 484 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1528 transitions. [2021-05-22 02:32:27,032 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1528 transitions. Word has length 21 [2021-05-22 02:32:27,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:27,032 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1528 transitions. [2021-05-22 02:32:27,032 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,032 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1528 transitions. [2021-05-22 02:32:27,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:27,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:27,032 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:27,233 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 912 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5205 [2021-05-22 02:32:27,233 INFO L430 AbstractCegarLoop]: === Iteration 924 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:27,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:27,233 INFO L82 PathProgramCache]: Analyzing trace with hash -1105333819, now seen corresponding path program 912 times [2021-05-22 02:32:27,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:27,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727545303] [2021-05-22 02:32:27,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:27,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:27,324 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:27,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:27,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727545303] [2021-05-22 02:32:27,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727545303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:27,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [238248219] [2021-05-22 02:32:27,324 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 913 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 913 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:27,350 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:27,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:27,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:27,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:27,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:27,396 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:27,401 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:27,402 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:27,402 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:32:27,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:27,424 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:27,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:27,426 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:27,435 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:27,435 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:27,435 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:27,435 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:32:27,506 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:27,506 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [238248219] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:27,506 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:27,506 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:27,506 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337208494] [2021-05-22 02:32:27,506 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:27,506 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:27,506 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:27,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:27,507 INFO L87 Difference]: Start difference. First operand 485 states and 1528 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:27,784 INFO L93 Difference]: Finished difference Result 688 states and 2123 transitions. [2021-05-22 02:32:27,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:27,784 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:27,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:27,785 INFO L225 Difference]: With dead ends: 688 [2021-05-22 02:32:27,785 INFO L226 Difference]: Without dead ends: 665 [2021-05-22 02:32:27,785 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 251.2ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:27,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-05-22 02:32:27,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 481. [2021-05-22 02:32:27,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.15) internal successors, (1512), 480 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1512 transitions. [2021-05-22 02:32:27,791 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1512 transitions. Word has length 21 [2021-05-22 02:32:27,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:27,791 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1512 transitions. [2021-05-22 02:32:27,791 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:27,791 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1512 transitions. [2021-05-22 02:32:27,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:27,791 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:27,791 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:27,992 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 913 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5210 [2021-05-22 02:32:27,992 INFO L430 AbstractCegarLoop]: === Iteration 925 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:27,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:27,992 INFO L82 PathProgramCache]: Analyzing trace with hash 294644715, now seen corresponding path program 913 times [2021-05-22 02:32:27,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:27,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256270764] [2021-05-22 02:32:27,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:27,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:28,090 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:28,090 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:28,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256270764] [2021-05-22 02:32:28,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256270764] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:28,090 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1904625133] [2021-05-22 02:32:28,090 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 914 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 914 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:28,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:28,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:28,115 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:28,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:28,145 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,149 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:28,150 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,150 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:32:28,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:32:28,171 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,173 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:32:28,174 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,182 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:28,182 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:28,183 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:28,183 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:32:28,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:28,216 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1904625133] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:28,216 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:28,216 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:32:28,216 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716919116] [2021-05-22 02:32:28,216 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:32:28,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:28,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:32:28,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:28,216 INFO L87 Difference]: Start difference. First operand 481 states and 1512 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:28,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:28,376 INFO L93 Difference]: Finished difference Result 625 states and 1934 transitions. [2021-05-22 02:32:28,376 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:28,376 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:28,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:28,377 INFO L225 Difference]: With dead ends: 625 [2021-05-22 02:32:28,377 INFO L226 Difference]: Without dead ends: 589 [2021-05-22 02:32:28,377 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 125.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:28,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-22 02:32:28,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 482. [2021-05-22 02:32:28,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1538461538461537) internal successors, (1517), 481 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:28,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1517 transitions. [2021-05-22 02:32:28,382 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1517 transitions. Word has length 21 [2021-05-22 02:32:28,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:28,382 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1517 transitions. [2021-05-22 02:32:28,382 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:28,382 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1517 transitions. [2021-05-22 02:32:28,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:28,383 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:28,383 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:28,583 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5216,914 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:28,583 INFO L430 AbstractCegarLoop]: === Iteration 926 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:28,583 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:28,584 INFO L82 PathProgramCache]: Analyzing trace with hash 591911125, now seen corresponding path program 914 times [2021-05-22 02:32:28,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:28,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1419786068] [2021-05-22 02:32:28,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:28,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:28,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:28,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:28,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1419786068] [2021-05-22 02:32:28,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1419786068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:28,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [489836046] [2021-05-22 02:32:28,667 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 915 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 915 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:28,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:28,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:28,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:28,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:28,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:28,730 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:28,732 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,740 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:28,741 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:28,741 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:28,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:28,767 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,777 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:28,777 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:28,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:28,779 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:28,788 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:28,788 INFO L518 ElimStorePlain]: Eliminatee v_prenex_268 vanished before elimination [2021-05-22 02:32:28,788 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:28,788 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:32:28,857 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:28,857 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [489836046] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:28,857 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:28,857 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:28,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1544010556] [2021-05-22 02:32:28,858 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:28,858 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:28,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:28,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:28,858 INFO L87 Difference]: Start difference. First operand 482 states and 1517 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:29,157 INFO L93 Difference]: Finished difference Result 727 states and 2234 transitions. [2021-05-22 02:32:29,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:32:29,157 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:29,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:29,158 INFO L225 Difference]: With dead ends: 727 [2021-05-22 02:32:29,158 INFO L226 Difference]: Without dead ends: 704 [2021-05-22 02:32:29,159 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 260.9ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:29,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 704 states. [2021-05-22 02:32:29,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 704 to 497. [2021-05-22 02:32:29,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1693548387096775) internal successors, (1572), 496 states have internal predecessors, (1572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1572 transitions. [2021-05-22 02:32:29,164 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1572 transitions. Word has length 21 [2021-05-22 02:32:29,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:29,164 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1572 transitions. [2021-05-22 02:32:29,164 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,164 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1572 transitions. [2021-05-22 02:32:29,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:29,165 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:29,165 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:29,365 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5219,915 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:29,365 INFO L430 AbstractCegarLoop]: === Iteration 927 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:29,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:29,366 INFO L82 PathProgramCache]: Analyzing trace with hash 307648441, now seen corresponding path program 915 times [2021-05-22 02:32:29,366 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:29,366 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169590634] [2021-05-22 02:32:29,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:29,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:29,469 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:29,470 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:29,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169590634] [2021-05-22 02:32:29,470 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169590634] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:29,470 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738630811] [2021-05-22 02:32:29,470 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 916 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 916 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:29,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:32:29,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:29,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:29,496 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:29,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:29,531 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:29,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:29,533 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:29,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:29,542 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:29,542 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:29,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:29,569 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:29,578 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:29,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:29,581 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:29,589 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:29,590 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:29,590 INFO L518 ElimStorePlain]: Eliminatee v_prenex_269 vanished before elimination [2021-05-22 02:32:29,590 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:29,590 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:32:29,664 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:29,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738630811] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:29,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:29,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:29,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1914547311] [2021-05-22 02:32:29,665 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:29,665 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:29,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:29,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:29,665 INFO L87 Difference]: Start difference. First operand 497 states and 1572 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:29,976 INFO L93 Difference]: Finished difference Result 812 states and 2510 transitions. [2021-05-22 02:32:29,976 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:32:29,976 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:29,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:29,977 INFO L225 Difference]: With dead ends: 812 [2021-05-22 02:32:29,977 INFO L226 Difference]: Without dead ends: 785 [2021-05-22 02:32:29,977 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 270.6ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:29,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 785 states. [2021-05-22 02:32:29,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 785 to 503. [2021-05-22 02:32:29,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.1673306772908365) internal successors, (1590), 502 states have internal predecessors, (1590), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1590 transitions. [2021-05-22 02:32:29,983 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1590 transitions. Word has length 21 [2021-05-22 02:32:29,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:29,983 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1590 transitions. [2021-05-22 02:32:29,983 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:29,983 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1590 transitions. [2021-05-22 02:32:29,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:29,984 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:29,984 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:30,184 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5227,916 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:30,184 INFO L430 AbstractCegarLoop]: === Iteration 928 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:30,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:30,185 INFO L82 PathProgramCache]: Analyzing trace with hash -1653098525, now seen corresponding path program 916 times [2021-05-22 02:32:30,185 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:30,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356531116] [2021-05-22 02:32:30,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:30,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:30,258 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:30,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:30,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356531116] [2021-05-22 02:32:30,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1356531116] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:30,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073195289] [2021-05-22 02:32:30,258 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 917 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 917 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:30,282 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:30,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:30,283 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:30,283 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:30,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:30,322 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:30,324 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,333 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:30,333 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:30,333 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:30,367 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:30,368 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,371 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:30,371 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:30,371 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,371 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:32:30,386 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:30,386 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073195289] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:30,386 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:30,386 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:32:30,386 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924607968] [2021-05-22 02:32:30,387 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:32:30,387 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:30,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:32:30,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:32:30,387 INFO L87 Difference]: Start difference. First operand 503 states and 1590 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:30,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:30,564 INFO L93 Difference]: Finished difference Result 631 states and 1952 transitions. [2021-05-22 02:32:30,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:30,564 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:30,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:30,565 INFO L225 Difference]: With dead ends: 631 [2021-05-22 02:32:30,565 INFO L226 Difference]: Without dead ends: 612 [2021-05-22 02:32:30,565 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 138.2ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:30,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 612 states. [2021-05-22 02:32:30,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 612 to 485. [2021-05-22 02:32:30,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.1632231404958677) internal successors, (1531), 484 states have internal predecessors, (1531), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:30,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1531 transitions. [2021-05-22 02:32:30,570 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1531 transitions. Word has length 21 [2021-05-22 02:32:30,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:30,571 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1531 transitions. [2021-05-22 02:32:30,571 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:30,571 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1531 transitions. [2021-05-22 02:32:30,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:30,571 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:30,571 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:30,771 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5238,917 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:30,772 INFO L430 AbstractCegarLoop]: === Iteration 929 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:30,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:30,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1107725871, now seen corresponding path program 917 times [2021-05-22 02:32:30,772 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:30,772 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202260559] [2021-05-22 02:32:30,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:30,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:30,854 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:30,854 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:30,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202260559] [2021-05-22 02:32:30,854 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202260559] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:30,854 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [555415397] [2021-05-22 02:32:30,854 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 918 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 918 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:30,879 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:30,879 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:30,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:30,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:30,911 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:30,912 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,914 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:30,914 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,923 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:30,923 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:30,923 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:32:30,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:30,983 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,985 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:30,986 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:30,986 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:30,986 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:32:30,996 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:30,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [555415397] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:30,996 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:30,996 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:30,997 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572447037] [2021-05-22 02:32:30,997 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:30,997 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:30,997 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:30,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:30,997 INFO L87 Difference]: Start difference. First operand 485 states and 1531 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:31,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:31,203 INFO L93 Difference]: Finished difference Result 650 states and 2005 transitions. [2021-05-22 02:32:31,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:31,203 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:31,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:31,204 INFO L225 Difference]: With dead ends: 650 [2021-05-22 02:32:31,204 INFO L226 Difference]: Without dead ends: 629 [2021-05-22 02:32:31,204 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 179.8ms TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:31,205 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 629 states. [2021-05-22 02:32:31,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 629 to 485. [2021-05-22 02:32:31,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.1714876033057853) internal successors, (1535), 484 states have internal predecessors, (1535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:31,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1535 transitions. [2021-05-22 02:32:31,209 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1535 transitions. Word has length 21 [2021-05-22 02:32:31,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:31,210 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1535 transitions. [2021-05-22 02:32:31,210 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:31,210 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1535 transitions. [2021-05-22 02:32:31,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:31,210 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:31,210 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:31,410 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 918 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5241 [2021-05-22 02:32:31,411 INFO L430 AbstractCegarLoop]: === Iteration 930 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:31,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:31,411 INFO L82 PathProgramCache]: Analyzing trace with hash 1468256743, now seen corresponding path program 918 times [2021-05-22 02:32:31,411 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:31,411 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [575317522] [2021-05-22 02:32:31,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:31,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:31,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:31,507 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:31,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [575317522] [2021-05-22 02:32:31,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [575317522] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:31,507 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169806687] [2021-05-22 02:32:31,507 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 919 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 919 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:31,533 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:32:31,533 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:31,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:31,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:31,615 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[v_prenex_271]} [2021-05-22 02:32:31,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:31,618 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:31,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:31,633 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:31,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:31,634 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:31,646 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:31,648 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:31,648 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:50, output treesize:34 [2021-05-22 02:32:31,705 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:31,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:31,706 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:31,713 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:31,715 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:31,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:31,716 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:31,722 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:31,723 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:31,723 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:32:31,769 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:31,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169806687] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:31,769 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:31,769 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:31,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847655813] [2021-05-22 02:32:31,769 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:31,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:31,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:31,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:31,769 INFO L87 Difference]: Start difference. First operand 485 states and 1535 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:32,198 INFO L93 Difference]: Finished difference Result 776 states and 2395 transitions. [2021-05-22 02:32:32,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:32:32,199 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:32,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:32,199 INFO L225 Difference]: With dead ends: 776 [2021-05-22 02:32:32,200 INFO L226 Difference]: Without dead ends: 755 [2021-05-22 02:32:32,200 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 343.6ms TimeCoverageRelationStatistics Valid=91, Invalid=415, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:32,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-05-22 02:32:32,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 481. [2021-05-22 02:32:32,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 481 states, 480 states have (on average 3.1625) internal successors, (1518), 480 states have internal predecessors, (1518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 481 states to 481 states and 1518 transitions. [2021-05-22 02:32:32,205 INFO L78 Accepts]: Start accepts. Automaton has 481 states and 1518 transitions. Word has length 21 [2021-05-22 02:32:32,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:32,205 INFO L482 AbstractCegarLoop]: Abstraction has 481 states and 1518 transitions. [2021-05-22 02:32:32,205 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,205 INFO L276 IsEmpty]: Start isEmpty. Operand 481 states and 1518 transitions. [2021-05-22 02:32:32,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:32,206 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:32,206 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:32,406 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5247,919 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:32,406 INFO L430 AbstractCegarLoop]: === Iteration 931 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:32,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:32,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1430323375, now seen corresponding path program 919 times [2021-05-22 02:32:32,407 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:32,407 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336420718] [2021-05-22 02:32:32,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:32,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:32,498 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:32,499 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:32,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336420718] [2021-05-22 02:32:32,499 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336420718] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:32,499 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1620840487] [2021-05-22 02:32:32,499 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 920 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 920 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:32,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:32,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:32,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:32,581 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:32,582 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:32,588 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:32,589 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:32,589 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:32:32,637 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:32,638 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:32,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:32,643 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:32,645 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:32,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:32,645 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:32,650 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:32,650 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:32,650 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:32:32,679 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:32,680 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1620840487] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:32,680 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:32,680 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:32,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764013461] [2021-05-22 02:32:32,680 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:32,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:32,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:32,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=252, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:32,680 INFO L87 Difference]: Start difference. First operand 481 states and 1518 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:32,895 INFO L93 Difference]: Finished difference Result 769 states and 2380 transitions. [2021-05-22 02:32:32,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:32:32,895 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:32,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:32,896 INFO L225 Difference]: With dead ends: 769 [2021-05-22 02:32:32,896 INFO L226 Difference]: Without dead ends: 748 [2021-05-22 02:32:32,896 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 197.4ms TimeCoverageRelationStatistics Valid=69, Invalid=351, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:32:32,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 748 states. [2021-05-22 02:32:32,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 748 to 487. [2021-05-22 02:32:32,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1666666666666665) internal successors, (1539), 486 states have internal predecessors, (1539), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1539 transitions. [2021-05-22 02:32:32,902 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1539 transitions. Word has length 21 [2021-05-22 02:32:32,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:32,902 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1539 transitions. [2021-05-22 02:32:32,902 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:32,902 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1539 transitions. [2021-05-22 02:32:32,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:32,903 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:32,903 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:33,103 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5252,920 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:33,103 INFO L430 AbstractCegarLoop]: === Iteration 932 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:33,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:33,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1534715759, now seen corresponding path program 920 times [2021-05-22 02:32:33,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:33,104 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1631838943] [2021-05-22 02:32:33,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:33,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:33,186 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:33,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1631838943] [2021-05-22 02:32:33,186 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1631838943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:33,186 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [700129366] [2021-05-22 02:32:33,186 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 921 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 921 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:33,212 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:33,212 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:33,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:33,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:33,271 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:33,272 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,279 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:33,279 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:32:33,301 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:33,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:33,303 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,309 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,310 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:33,311 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:33,311 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,317 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,318 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,318 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:32:33,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:33,332 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [700129366] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:33,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:33,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:33,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549508493] [2021-05-22 02:32:33,332 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:33,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:33,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:33,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:33,333 INFO L87 Difference]: Start difference. First operand 487 states and 1539 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:33,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:33,471 INFO L93 Difference]: Finished difference Result 637 states and 1975 transitions. [2021-05-22 02:32:33,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:33,472 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:33,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:33,473 INFO L225 Difference]: With dead ends: 637 [2021-05-22 02:32:33,473 INFO L226 Difference]: Without dead ends: 616 [2021-05-22 02:32:33,473 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 129.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:33,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 616 states. [2021-05-22 02:32:33,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 616 to 484. [2021-05-22 02:32:33,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 484 states, 483 states have (on average 3.1614906832298137) internal successors, (1527), 483 states have internal predecessors, (1527), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:33,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 484 states to 484 states and 1527 transitions. [2021-05-22 02:32:33,478 INFO L78 Accepts]: Start accepts. Automaton has 484 states and 1527 transitions. Word has length 21 [2021-05-22 02:32:33,478 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:33,478 INFO L482 AbstractCegarLoop]: Abstraction has 484 states and 1527 transitions. [2021-05-22 02:32:33,478 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:33,478 INFO L276 IsEmpty]: Start isEmpty. Operand 484 states and 1527 transitions. [2021-05-22 02:32:33,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:33,479 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:33,479 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:33,679 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5258,921 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:33,679 INFO L430 AbstractCegarLoop]: === Iteration 933 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:33,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:33,680 INFO L82 PathProgramCache]: Analyzing trace with hash 619634271, now seen corresponding path program 921 times [2021-05-22 02:32:33,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:33,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313288475] [2021-05-22 02:32:33,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:33,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:33,767 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:33,768 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:33,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313288475] [2021-05-22 02:32:33,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [313288475] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:33,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759424471] [2021-05-22 02:32:33,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 922 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 922 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:33,793 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:32:33,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:33,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:33,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:33,889 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:33,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:33,890 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,896 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,897 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:33,897 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:29, output treesize:22 [2021-05-22 02:32:33,922 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:33,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:33,923 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,930 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,932 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:33,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:33,933 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,939 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:33,940 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:33,940 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:10 [2021-05-22 02:32:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:33,985 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759424471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:33,985 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:33,985 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:33,985 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048804432] [2021-05-22 02:32:33,985 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:33,985 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:33,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:33,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:33,985 INFO L87 Difference]: Start difference. First operand 484 states and 1527 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:34,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:34,266 INFO L93 Difference]: Finished difference Result 777 states and 2402 transitions. [2021-05-22 02:32:34,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:32:34,267 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:34,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:34,268 INFO L225 Difference]: With dead ends: 777 [2021-05-22 02:32:34,268 INFO L226 Difference]: Without dead ends: 756 [2021-05-22 02:32:34,268 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 255.4ms TimeCoverageRelationStatistics Valid=78, Invalid=384, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:34,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2021-05-22 02:32:34,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 480. [2021-05-22 02:32:34,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 479 states have (on average 3.1607515657620042) internal successors, (1514), 479 states have internal predecessors, (1514), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:34,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 1514 transitions. [2021-05-22 02:32:34,279 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 1514 transitions. Word has length 21 [2021-05-22 02:32:34,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:34,279 INFO L482 AbstractCegarLoop]: Abstraction has 480 states and 1514 transitions. [2021-05-22 02:32:34,279 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:34,279 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 1514 transitions. [2021-05-22 02:32:34,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:34,279 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:34,280 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:34,480 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 922 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5260 [2021-05-22 02:32:34,480 INFO L430 AbstractCegarLoop]: === Iteration 934 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:34,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:34,480 INFO L82 PathProgramCache]: Analyzing trace with hash -2082457945, now seen corresponding path program 922 times [2021-05-22 02:32:34,480 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:34,480 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126283498] [2021-05-22 02:32:34,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:34,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:34,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:34,549 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:34,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126283498] [2021-05-22 02:32:34,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126283498] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:34,549 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308317171] [2021-05-22 02:32:34,549 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 923 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 923 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:34,579 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:34,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:34,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:34,580 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:34,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:34,597 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:34,600 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:34,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:34,600 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:32:34,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:34,634 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:34,637 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:34,637 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:32:34,637 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:34,637 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:32:34,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:34,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308317171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:34,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:34,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:34,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756191754] [2021-05-22 02:32:34,663 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:34,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:34,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:34,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:34,664 INFO L87 Difference]: Start difference. First operand 480 states and 1514 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:35,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:35,340 INFO L93 Difference]: Finished difference Result 984 states and 2991 transitions. [2021-05-22 02:32:35,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:32:35,340 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:35,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:35,342 INFO L225 Difference]: With dead ends: 984 [2021-05-22 02:32:35,342 INFO L226 Difference]: Without dead ends: 963 [2021-05-22 02:32:35,342 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 455.0ms TimeCoverageRelationStatistics Valid=235, Invalid=1097, Unknown=0, NotChecked=0, Total=1332 [2021-05-22 02:32:35,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 963 states. [2021-05-22 02:32:35,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 963 to 478. [2021-05-22 02:32:35,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.1446540880503147) internal successors, (1500), 477 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:35,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1500 transitions. [2021-05-22 02:32:35,348 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1500 transitions. Word has length 21 [2021-05-22 02:32:35,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:35,348 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1500 transitions. [2021-05-22 02:32:35,348 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:35,349 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1500 transitions. [2021-05-22 02:32:35,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:35,349 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:35,349 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:35,549 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5263,923 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:35,550 INFO L430 AbstractCegarLoop]: === Iteration 935 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:35,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:35,550 INFO L82 PathProgramCache]: Analyzing trace with hash 2095251849, now seen corresponding path program 923 times [2021-05-22 02:32:35,550 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:35,550 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [910304427] [2021-05-22 02:32:35,550 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:35,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:35,630 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:35,630 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:35,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [910304427] [2021-05-22 02:32:35,630 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [910304427] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:35,630 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278605580] [2021-05-22 02:32:35,631 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 924 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 924 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:35,656 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:32:35,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:35,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:32:35,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:35,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:35,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:35,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:35,724 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:35,724 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:32:35,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:35,741 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:35,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:35,743 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:35,757 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:35,757 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:32:35,757 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:35,757 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:32:35,835 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:35,835 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278605580] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:35,835 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:35,835 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:32:35,835 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [177342140] [2021-05-22 02:32:35,835 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:32:35,835 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:35,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:32:35,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:35,836 INFO L87 Difference]: Start difference. First operand 478 states and 1500 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:36,127 INFO L93 Difference]: Finished difference Result 811 states and 2487 transitions. [2021-05-22 02:32:36,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:32:36,127 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:36,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:36,128 INFO L225 Difference]: With dead ends: 811 [2021-05-22 02:32:36,128 INFO L226 Difference]: Without dead ends: 790 [2021-05-22 02:32:36,129 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 270.0ms TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:36,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 790 states. [2021-05-22 02:32:36,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 790 to 454. [2021-05-22 02:32:36,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.1280353200883004) internal successors, (1417), 453 states have internal predecessors, (1417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1417 transitions. [2021-05-22 02:32:36,134 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1417 transitions. Word has length 21 [2021-05-22 02:32:36,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:36,134 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1417 transitions. [2021-05-22 02:32:36,134 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,134 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1417 transitions. [2021-05-22 02:32:36,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:36,135 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:36,135 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:36,335 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 924 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5265 [2021-05-22 02:32:36,335 INFO L430 AbstractCegarLoop]: === Iteration 936 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:36,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:36,335 INFO L82 PathProgramCache]: Analyzing trace with hash -1901610267, now seen corresponding path program 924 times [2021-05-22 02:32:36,335 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:36,335 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426990557] [2021-05-22 02:32:36,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:36,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:36,424 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:36,424 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:36,424 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426990557] [2021-05-22 02:32:36,424 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1426990557] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:36,425 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45740886] [2021-05-22 02:32:36,425 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 925 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 925 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:36,450 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:32:36,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:36,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:36,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:36,514 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:36,515 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:36,515 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:36,522 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:36,523 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:36,523 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:32:36,582 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:36,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:36,583 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:36,590 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:36,592 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:36,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:36,593 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:36,599 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:36,600 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:36,600 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:32:36,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:36,608 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [45740886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:36,609 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:36,609 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:36,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129709251] [2021-05-22 02:32:36,609 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:36,609 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:36,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:36,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:36,609 INFO L87 Difference]: Start difference. First operand 454 states and 1417 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:36,750 INFO L93 Difference]: Finished difference Result 531 states and 1638 transitions. [2021-05-22 02:32:36,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:36,751 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:36,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:36,751 INFO L225 Difference]: With dead ends: 531 [2021-05-22 02:32:36,751 INFO L226 Difference]: Without dead ends: 509 [2021-05-22 02:32:36,751 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 152.7ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:36,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-05-22 02:32:36,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 459. [2021-05-22 02:32:36,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.131004366812227) internal successors, (1434), 458 states have internal predecessors, (1434), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1434 transitions. [2021-05-22 02:32:36,756 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1434 transitions. Word has length 21 [2021-05-22 02:32:36,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:36,756 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1434 transitions. [2021-05-22 02:32:36,756 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:36,756 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1434 transitions. [2021-05-22 02:32:36,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:36,757 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:36,757 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:36,957 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 925 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5271 [2021-05-22 02:32:36,957 INFO L430 AbstractCegarLoop]: === Iteration 937 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:36,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:36,958 INFO L82 PathProgramCache]: Analyzing trace with hash 1891565693, now seen corresponding path program 925 times [2021-05-22 02:32:36,958 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:36,958 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456365222] [2021-05-22 02:32:36,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:36,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:37,041 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:37,042 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:37,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456365222] [2021-05-22 02:32:37,042 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456365222] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:37,042 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [878126973] [2021-05-22 02:32:37,042 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 926 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 926 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:37,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:37,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:37,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:37,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:37,143 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,152 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,153 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:37,153 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:32:37,187 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:37,189 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,199 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,201 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:37,202 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,212 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,213 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,213 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:32:37,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:37,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [878126973] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:37,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:37,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:37,235 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280209031] [2021-05-22 02:32:37,235 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:37,235 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:37,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:37,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:37,235 INFO L87 Difference]: Start difference. First operand 459 states and 1434 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:37,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:37,379 INFO L93 Difference]: Finished difference Result 540 states and 1662 transitions. [2021-05-22 02:32:37,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:37,379 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:37,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:37,380 INFO L225 Difference]: With dead ends: 540 [2021-05-22 02:32:37,380 INFO L226 Difference]: Without dead ends: 518 [2021-05-22 02:32:37,380 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 137.8ms TimeCoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:37,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-22 02:32:37,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 456. [2021-05-22 02:32:37,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1252747252747253) internal successors, (1422), 455 states have internal predecessors, (1422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:37,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1422 transitions. [2021-05-22 02:32:37,386 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1422 transitions. Word has length 21 [2021-05-22 02:32:37,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:37,386 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1422 transitions. [2021-05-22 02:32:37,386 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:37,386 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1422 transitions. [2021-05-22 02:32:37,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:37,387 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:37,387 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:37,596 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 926 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5277 [2021-05-22 02:32:37,597 INFO L430 AbstractCegarLoop]: === Iteration 938 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:37,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:37,597 INFO L82 PathProgramCache]: Analyzing trace with hash -215218427, now seen corresponding path program 926 times [2021-05-22 02:32:37,597 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:37,597 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226467500] [2021-05-22 02:32:37,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:37,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:37,703 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:37,704 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:37,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226467500] [2021-05-22 02:32:37,704 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1226467500] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:37,704 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [175370125] [2021-05-22 02:32:37,704 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 927 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 927 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:37,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:37,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:37,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:37,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:37,825 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:37,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,837 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:37,837 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:32:37,872 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:37,873 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,887 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:37,887 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:37,888 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,898 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:37,899 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:37,899 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:32:37,915 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:37,916 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [175370125] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:37,916 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:37,916 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:37,916 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017417795] [2021-05-22 02:32:37,916 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:37,916 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:37,916 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:37,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:37,916 INFO L87 Difference]: Start difference. First operand 456 states and 1422 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:38,066 INFO L93 Difference]: Finished difference Result 528 states and 1629 transitions. [2021-05-22 02:32:38,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:38,066 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:38,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:38,067 INFO L225 Difference]: With dead ends: 528 [2021-05-22 02:32:38,067 INFO L226 Difference]: Without dead ends: 506 [2021-05-22 02:32:38,068 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 169.6ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:38,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 506 states. [2021-05-22 02:32:38,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 506 to 453. [2021-05-22 02:32:38,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1261061946902653) internal successors, (1413), 452 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1413 transitions. [2021-05-22 02:32:38,074 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1413 transitions. Word has length 21 [2021-05-22 02:32:38,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:38,074 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1413 transitions. [2021-05-22 02:32:38,074 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,074 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1413 transitions. [2021-05-22 02:32:38,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:38,074 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:38,075 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:38,284 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5279,927 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:38,285 INFO L430 AbstractCegarLoop]: === Iteration 939 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:38,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:38,285 INFO L82 PathProgramCache]: Analyzing trace with hash 303568207, now seen corresponding path program 927 times [2021-05-22 02:32:38,285 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:38,285 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200956804] [2021-05-22 02:32:38,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:38,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:38,380 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:38,380 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:38,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200956804] [2021-05-22 02:32:38,380 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200956804] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:38,380 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969244897] [2021-05-22 02:32:38,380 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 928 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 928 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:38,405 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:32:38,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:38,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:38,406 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:38,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:38,484 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:38,485 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:38,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:38,486 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:38,497 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:38,498 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:38,498 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:38,564 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:38,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:38,566 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:38,573 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:38,574 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:38,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:38,575 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:38,582 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:38,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:38,583 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:38,609 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:38,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969244897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:38,610 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:38,610 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:38,610 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575785873] [2021-05-22 02:32:38,610 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:38,610 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:38,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:38,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:38,610 INFO L87 Difference]: Start difference. First operand 453 states and 1413 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:38,926 INFO L93 Difference]: Finished difference Result 660 states and 2029 transitions. [2021-05-22 02:32:38,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:32:38,926 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:38,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:38,927 INFO L225 Difference]: With dead ends: 660 [2021-05-22 02:32:38,927 INFO L226 Difference]: Without dead ends: 641 [2021-05-22 02:32:38,927 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 320.5ms TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:38,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-22 02:32:38,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 457. [2021-05-22 02:32:38,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.125) internal successors, (1425), 456 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1425 transitions. [2021-05-22 02:32:38,932 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1425 transitions. Word has length 21 [2021-05-22 02:32:38,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:38,932 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1425 transitions. [2021-05-22 02:32:38,932 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:38,932 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1425 transitions. [2021-05-22 02:32:38,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:38,933 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:38,933 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:39,133 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 928 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5281 [2021-05-22 02:32:39,133 INFO L430 AbstractCegarLoop]: === Iteration 940 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:39,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:39,133 INFO L82 PathProgramCache]: Analyzing trace with hash 81359595, now seen corresponding path program 928 times [2021-05-22 02:32:39,133 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:39,134 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552342972] [2021-05-22 02:32:39,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:39,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:39,222 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:39,223 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:39,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552342972] [2021-05-22 02:32:39,223 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552342972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:39,223 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1959577613] [2021-05-22 02:32:39,223 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 929 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 929 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:39,247 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:39,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:39,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:39,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:39,308 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:39,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:39,309 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:39,316 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:39,317 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:39,317 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:32:39,394 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:39,395 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:39,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:39,396 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:39,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:39,398 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:39,409 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:39,411 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:39,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:39,412 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:39,422 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:39,423 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:39,424 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:51, output treesize:5 [2021-05-22 02:32:39,450 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:39,450 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1959577613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:39,450 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:39,450 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:39,450 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486387341] [2021-05-22 02:32:39,450 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:39,450 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:39,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:39,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:39,450 INFO L87 Difference]: Start difference. First operand 457 states and 1425 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:39,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:39,732 INFO L93 Difference]: Finished difference Result 761 states and 2314 transitions. [2021-05-22 02:32:39,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:32:39,732 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:39,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:39,733 INFO L225 Difference]: With dead ends: 761 [2021-05-22 02:32:39,733 INFO L226 Difference]: Without dead ends: 701 [2021-05-22 02:32:39,734 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 254.2ms TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:32:39,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 701 states. [2021-05-22 02:32:39,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 701 to 457. [2021-05-22 02:32:39,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.120614035087719) internal successors, (1423), 456 states have internal predecessors, (1423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:39,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1423 transitions. [2021-05-22 02:32:39,739 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1423 transitions. Word has length 21 [2021-05-22 02:32:39,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:39,739 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1423 transitions. [2021-05-22 02:32:39,739 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:39,739 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1423 transitions. [2021-05-22 02:32:39,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:39,739 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:39,740 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:39,940 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 929 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5287 [2021-05-22 02:32:39,940 INFO L430 AbstractCegarLoop]: === Iteration 941 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:39,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:39,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1989960047, now seen corresponding path program 929 times [2021-05-22 02:32:39,940 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:39,940 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715898689] [2021-05-22 02:32:39,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:39,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:40,038 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:40,038 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:40,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715898689] [2021-05-22 02:32:40,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715898689] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:40,038 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25888463] [2021-05-22 02:32:40,038 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 930 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 930 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:40,064 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:40,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:40,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:40,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:40,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:40,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:40,143 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:40,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:40,144 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:40,155 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:40,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:40,156 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:40,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:40,199 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:40,201 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:40,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:40,202 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:40,217 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:40,219 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:40,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:40,219 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:40,239 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:40,240 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:40,240 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:32:40,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:40,286 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25888463] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:40,286 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:40,286 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:40,287 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619407891] [2021-05-22 02:32:40,287 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:40,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:40,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:40,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:40,287 INFO L87 Difference]: Start difference. First operand 457 states and 1423 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:40,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:40,682 INFO L93 Difference]: Finished difference Result 737 states and 2270 transitions. [2021-05-22 02:32:40,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:32:40,682 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:40,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:40,683 INFO L225 Difference]: With dead ends: 737 [2021-05-22 02:32:40,683 INFO L226 Difference]: Without dead ends: 714 [2021-05-22 02:32:40,683 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 325.2ms TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:40,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 714 states. [2021-05-22 02:32:40,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 714 to 455. [2021-05-22 02:32:40,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 3.1233480176211454) internal successors, (1418), 454 states have internal predecessors, (1418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:40,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 1418 transitions. [2021-05-22 02:32:40,688 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 1418 transitions. Word has length 21 [2021-05-22 02:32:40,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:40,688 INFO L482 AbstractCegarLoop]: Abstraction has 455 states and 1418 transitions. [2021-05-22 02:32:40,688 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:40,688 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 1418 transitions. [2021-05-22 02:32:40,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:40,689 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:40,689 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:40,889 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 930 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5297 [2021-05-22 02:32:40,889 INFO L430 AbstractCegarLoop]: === Iteration 942 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:40,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:40,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1104161767, now seen corresponding path program 930 times [2021-05-22 02:32:40,889 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:40,889 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302904834] [2021-05-22 02:32:40,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:40,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:40,980 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:40,980 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:40,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302904834] [2021-05-22 02:32:40,980 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302904834] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:40,980 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [369603876] [2021-05-22 02:32:40,980 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 931 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 931 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:41,005 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:41,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:41,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:41,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:41,067 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:41,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:41,068 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,074 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:41,076 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:41,076 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:36, output treesize:29 [2021-05-22 02:32:41,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:41,122 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,123 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:41,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:41,124 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,138 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:41,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:41,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:41,141 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:41,155 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:41,155 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:32:41,200 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:41,201 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [369603876] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:41,201 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:41,201 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:41,201 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214950315] [2021-05-22 02:32:41,201 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:41,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:41,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:41,201 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:41,201 INFO L87 Difference]: Start difference. First operand 455 states and 1418 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:41,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:41,542 INFO L93 Difference]: Finished difference Result 732 states and 2245 transitions. [2021-05-22 02:32:41,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:32:41,543 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:41,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:41,544 INFO L225 Difference]: With dead ends: 732 [2021-05-22 02:32:41,544 INFO L226 Difference]: Without dead ends: 705 [2021-05-22 02:32:41,544 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 295.5ms TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:41,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2021-05-22 02:32:41,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 455. [2021-05-22 02:32:41,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 455 states, 454 states have (on average 3.1233480176211454) internal successors, (1418), 454 states have internal predecessors, (1418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:41,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 455 states to 455 states and 1418 transitions. [2021-05-22 02:32:41,555 INFO L78 Accepts]: Start accepts. Automaton has 455 states and 1418 transitions. Word has length 21 [2021-05-22 02:32:41,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:41,555 INFO L482 AbstractCegarLoop]: Abstraction has 455 states and 1418 transitions. [2021-05-22 02:32:41,555 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:41,555 INFO L276 IsEmpty]: Start isEmpty. Operand 455 states and 1418 transitions. [2021-05-22 02:32:41,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:41,555 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:41,555 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:41,756 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5305,931 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:41,756 INFO L430 AbstractCegarLoop]: === Iteration 943 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:41,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:41,756 INFO L82 PathProgramCache]: Analyzing trace with hash 819899083, now seen corresponding path program 931 times [2021-05-22 02:32:41,756 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:41,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1494531798] [2021-05-22 02:32:41,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:41,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:41,847 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:41,847 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:41,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1494531798] [2021-05-22 02:32:41,848 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1494531798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:41,848 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1790362901] [2021-05-22 02:32:41,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 932 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 932 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:41,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:41,872 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:41,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:41,946 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:41,947 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:41,947 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:41,948 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:41,950 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:41,960 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:41,961 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:41,961 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:42,001 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,001 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:42,002 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:42,005 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:42,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,021 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:42,021 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:42,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:42,036 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:32:42,084 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:42,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1790362901] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:42,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:42,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:42,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596986782] [2021-05-22 02:32:42,084 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:42,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:42,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:42,084 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:42,085 INFO L87 Difference]: Start difference. First operand 455 states and 1418 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:42,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:42,443 INFO L93 Difference]: Finished difference Result 726 states and 2219 transitions. [2021-05-22 02:32:42,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:32:42,443 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:42,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:42,444 INFO L225 Difference]: With dead ends: 726 [2021-05-22 02:32:42,444 INFO L226 Difference]: Without dead ends: 699 [2021-05-22 02:32:42,444 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 309.5ms TimeCoverageRelationStatistics Valid=110, Invalid=490, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:32:42,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2021-05-22 02:32:42,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 467. [2021-05-22 02:32:42,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.11587982832618) internal successors, (1452), 466 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:42,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1452 transitions. [2021-05-22 02:32:42,450 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1452 transitions. Word has length 21 [2021-05-22 02:32:42,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:42,450 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1452 transitions. [2021-05-22 02:32:42,450 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:42,450 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1452 transitions. [2021-05-22 02:32:42,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:42,450 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:42,450 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:42,651 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 932 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5311 [2021-05-22 02:32:42,651 INFO L430 AbstractCegarLoop]: === Iteration 944 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:42,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:42,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1788676373, now seen corresponding path program 932 times [2021-05-22 02:32:42,651 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:42,651 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1794683346] [2021-05-22 02:32:42,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:42,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:42,741 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:42,741 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:42,741 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1794683346] [2021-05-22 02:32:42,741 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1794683346] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:42,742 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1792597746] [2021-05-22 02:32:42,742 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 933 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 933 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:42,767 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:42,767 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:42,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:42,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:42,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:42,859 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:42,862 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,872 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:42,873 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:42,873 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:31 [2021-05-22 02:32:42,927 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:42,928 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,935 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:42,937 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:42,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:42,938 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,944 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:42,946 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:42,946 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:42,980 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:42,981 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1792597746] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:42,981 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:42,981 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:42,981 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388918286] [2021-05-22 02:32:42,981 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:42,981 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:42,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:42,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:42,981 INFO L87 Difference]: Start difference. First operand 467 states and 1452 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:43,198 INFO L93 Difference]: Finished difference Result 643 states and 1971 transitions. [2021-05-22 02:32:43,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:32:43,198 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:43,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:43,199 INFO L225 Difference]: With dead ends: 643 [2021-05-22 02:32:43,199 INFO L226 Difference]: Without dead ends: 622 [2021-05-22 02:32:43,199 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 253.0ms TimeCoverageRelationStatistics Valid=87, Invalid=375, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:43,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2021-05-22 02:32:43,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 453. [2021-05-22 02:32:43,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1261061946902653) internal successors, (1413), 452 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1413 transitions. [2021-05-22 02:32:43,204 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1413 transitions. Word has length 21 [2021-05-22 02:32:43,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:43,204 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1413 transitions. [2021-05-22 02:32:43,204 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,204 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1413 transitions. [2021-05-22 02:32:43,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:43,204 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:43,204 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:43,405 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5323,933 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:43,405 INFO L430 AbstractCegarLoop]: === Iteration 945 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:43,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:43,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1517534615, now seen corresponding path program 933 times [2021-05-22 02:32:43,405 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:43,405 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1818039112] [2021-05-22 02:32:43,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:43,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:43,496 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:43,496 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:43,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1818039112] [2021-05-22 02:32:43,496 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1818039112] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:43,496 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [514351613] [2021-05-22 02:32:43,496 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 934 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 934 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:43,521 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:32:43,521 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:43,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:43,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:43,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:43,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:43,575 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:43,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:43,576 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:43,597 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:43,598 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:43,599 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:43,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:43,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:43,693 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:43,701 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:43,702 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:43,702 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:43,703 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:43,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:43,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:43,710 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:9 [2021-05-22 02:32:43,718 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:43,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [514351613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:43,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:43,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:43,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416909246] [2021-05-22 02:32:43,718 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:43,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:43,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:43,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:43,719 INFO L87 Difference]: Start difference. First operand 453 states and 1413 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:43,882 INFO L93 Difference]: Finished difference Result 579 states and 1785 transitions. [2021-05-22 02:32:43,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:43,882 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:43,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:43,883 INFO L225 Difference]: With dead ends: 579 [2021-05-22 02:32:43,883 INFO L226 Difference]: Without dead ends: 557 [2021-05-22 02:32:43,883 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 162.2ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:43,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2021-05-22 02:32:43,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 460. [2021-05-22 02:32:43,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.139433551198257) internal successors, (1441), 459 states have internal predecessors, (1441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1441 transitions. [2021-05-22 02:32:43,888 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1441 transitions. Word has length 21 [2021-05-22 02:32:43,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:43,888 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1441 transitions. [2021-05-22 02:32:43,888 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:43,888 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1441 transitions. [2021-05-22 02:32:43,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:43,889 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:43,889 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:44,089 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 934 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5330 [2021-05-22 02:32:44,089 INFO L430 AbstractCegarLoop]: === Iteration 946 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:44,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:44,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1015743279, now seen corresponding path program 934 times [2021-05-22 02:32:44,089 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:44,090 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719314551] [2021-05-22 02:32:44,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:44,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:44,182 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:44,182 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:44,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719314551] [2021-05-22 02:32:44,182 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1719314551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:44,182 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2136595280] [2021-05-22 02:32:44,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 935 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 935 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:44,207 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:44,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:44,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:44,208 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:44,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:44,261 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,262 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:44,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:44,263 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,281 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:44,282 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:44,282 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:44,349 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:44,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:44,352 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,361 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:44,362 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:44,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:44,363 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,371 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:44,372 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,372 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:32:44,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:44,390 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2136595280] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:44,390 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:44,390 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:44,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153521777] [2021-05-22 02:32:44,391 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:44,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:44,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:44,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:44,391 INFO L87 Difference]: Start difference. First operand 460 states and 1441 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:44,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:44,531 INFO L93 Difference]: Finished difference Result 570 states and 1761 transitions. [2021-05-22 02:32:44,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:44,532 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:44,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:44,532 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:32:44,532 INFO L226 Difference]: Without dead ends: 548 [2021-05-22 02:32:44,533 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 151.1ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:44,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2021-05-22 02:32:44,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 457. [2021-05-22 02:32:44,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.133771929824561) internal successors, (1429), 456 states have internal predecessors, (1429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:44,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1429 transitions. [2021-05-22 02:32:44,537 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1429 transitions. Word has length 21 [2021-05-22 02:32:44,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:44,537 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1429 transitions. [2021-05-22 02:32:44,537 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:44,537 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1429 transitions. [2021-05-22 02:32:44,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:44,538 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:44,538 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:44,738 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5338,935 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:44,738 INFO L430 AbstractCegarLoop]: === Iteration 947 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:44,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:44,739 INFO L82 PathProgramCache]: Analyzing trace with hash 2142858733, now seen corresponding path program 935 times [2021-05-22 02:32:44,739 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:44,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [245589039] [2021-05-22 02:32:44,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:44,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:44,821 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:44,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:44,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [245589039] [2021-05-22 02:32:44,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [245589039] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:44,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465450461] [2021-05-22 02:32:44,821 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 936 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 936 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:44,847 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:44,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:44,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:44,848 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:44,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:44,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:44,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:44,908 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:44,911 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:44,924 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:44,925 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:44,925 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:45,035 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:45,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:45,036 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,043 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:45,045 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:45,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:45,046 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,052 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:45,053 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,053 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:45,061 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:45,061 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465450461] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:45,061 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:45,061 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:45,061 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991867175] [2021-05-22 02:32:45,061 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:45,061 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:45,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:45,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:45,062 INFO L87 Difference]: Start difference. First operand 457 states and 1429 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:45,252 INFO L93 Difference]: Finished difference Result 558 states and 1710 transitions. [2021-05-22 02:32:45,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:45,252 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:45,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:45,253 INFO L225 Difference]: With dead ends: 558 [2021-05-22 02:32:45,253 INFO L226 Difference]: Without dead ends: 539 [2021-05-22 02:32:45,253 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 191.6ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:45,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 539 states. [2021-05-22 02:32:45,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 539 to 463. [2021-05-22 02:32:45,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.142857142857143) internal successors, (1452), 462 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1452 transitions. [2021-05-22 02:32:45,258 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1452 transitions. Word has length 21 [2021-05-22 02:32:45,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:45,258 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1452 transitions. [2021-05-22 02:32:45,258 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,258 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1452 transitions. [2021-05-22 02:32:45,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:45,258 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:45,258 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:45,458 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 936 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5342 [2021-05-22 02:32:45,459 INFO L430 AbstractCegarLoop]: === Iteration 948 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:45,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:45,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1920650121, now seen corresponding path program 936 times [2021-05-22 02:32:45,459 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:45,459 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679109300] [2021-05-22 02:32:45,459 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:45,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:45,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:45,535 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:45,535 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679109300] [2021-05-22 02:32:45,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679109300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:45,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404671123] [2021-05-22 02:32:45,536 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 937 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 937 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:45,561 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:32:45,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:45,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:45,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:45,604 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:45,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:45,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,613 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:45,614 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:45,614 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:45,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:45,717 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:45,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:45,720 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,731 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:45,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:45,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:45,733 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:45,743 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:45,745 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:45,745 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:51, output treesize:5 [2021-05-22 02:32:45,752 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:45,752 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404671123] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:45,752 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:45,752 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:45,752 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939613001] [2021-05-22 02:32:45,752 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:45,752 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:45,752 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:45,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:45,753 INFO L87 Difference]: Start difference. First operand 463 states and 1452 transitions. Second operand has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:45,909 INFO L93 Difference]: Finished difference Result 567 states and 1744 transitions. [2021-05-22 02:32:45,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:45,909 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:45,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:45,910 INFO L225 Difference]: With dead ends: 567 [2021-05-22 02:32:45,910 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:32:45,910 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 142.8ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:45,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:32:45,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 463. [2021-05-22 02:32:45,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.132034632034632) internal successors, (1447), 462 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1447 transitions. [2021-05-22 02:32:45,915 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1447 transitions. Word has length 21 [2021-05-22 02:32:45,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:45,915 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1447 transitions. [2021-05-22 02:32:45,915 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.875) internal successors, (30), 16 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:45,915 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1447 transitions. [2021-05-22 02:32:45,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:45,916 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:45,916 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:46,116 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5351,937 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:46,116 INFO L430 AbstractCegarLoop]: === Iteration 949 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:46,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:46,117 INFO L82 PathProgramCache]: Analyzing trace with hash -465716723, now seen corresponding path program 937 times [2021-05-22 02:32:46,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:46,117 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758367082] [2021-05-22 02:32:46,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:46,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:46,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:46,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:46,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758367082] [2021-05-22 02:32:46,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758367082] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:46,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579451224] [2021-05-22 02:32:46,226 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 938 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 938 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:46,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:46,258 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:46,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:46,359 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:46,360 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:46,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:46,361 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:46,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:46,365 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:46,381 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:46,383 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:46,383 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:46,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:46,495 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:46,498 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:46,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:46,499 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:46,518 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:46,521 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:46,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:46,522 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:46,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:46,543 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:46,543 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:32:46,580 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:46,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579451224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:46,581 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:46,581 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:46,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1739323355] [2021-05-22 02:32:46,581 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:46,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:46,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:46,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:46,581 INFO L87 Difference]: Start difference. First operand 463 states and 1447 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:46,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:46,786 INFO L93 Difference]: Finished difference Result 586 states and 1809 transitions. [2021-05-22 02:32:46,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:46,787 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:46,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:46,788 INFO L225 Difference]: With dead ends: 586 [2021-05-22 02:32:46,788 INFO L226 Difference]: Without dead ends: 563 [2021-05-22 02:32:46,788 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 232.2ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:46,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 563 states. [2021-05-22 02:32:46,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 563 to 463. [2021-05-22 02:32:46,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.132034632034632) internal successors, (1447), 462 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:46,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1447 transitions. [2021-05-22 02:32:46,794 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1447 transitions. Word has length 21 [2021-05-22 02:32:46,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:46,794 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1447 transitions. [2021-05-22 02:32:46,794 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:46,795 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1447 transitions. [2021-05-22 02:32:46,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:46,795 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:46,795 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:47,009 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 938 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5361 [2021-05-22 02:32:47,009 INFO L430 AbstractCegarLoop]: === Iteration 950 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:47,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:47,009 INFO L82 PathProgramCache]: Analyzing trace with hash -749979407, now seen corresponding path program 938 times [2021-05-22 02:32:47,009 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:47,009 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050186361] [2021-05-22 02:32:47,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:47,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:47,114 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:47,114 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:47,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050186361] [2021-05-22 02:32:47,114 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050186361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:47,114 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [750352412] [2021-05-22 02:32:47,115 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 939 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 939 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:47,146 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:47,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:47,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:47,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:47,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:47,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:47,212 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:47,223 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:47,224 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:47,225 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:47,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:47,352 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:47,354 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:47,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:47,355 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:47,373 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:47,391 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:47,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:47,392 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:47,410 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:47,412 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:47,412 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:32:47,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:47,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [750352412] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:47,452 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:47,452 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:47,452 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311154870] [2021-05-22 02:32:47,452 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:47,453 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:47,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:47,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:47,453 INFO L87 Difference]: Start difference. First operand 463 states and 1447 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:47,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:47,789 INFO L93 Difference]: Finished difference Result 557 states and 1716 transitions. [2021-05-22 02:32:47,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:47,790 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:47,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:47,791 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:32:47,791 INFO L226 Difference]: Without dead ends: 530 [2021-05-22 02:32:47,791 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 192.4ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:47,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 530 states. [2021-05-22 02:32:47,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 530 to 461. [2021-05-22 02:32:47,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.134782608695652) internal successors, (1442), 460 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:47,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1442 transitions. [2021-05-22 02:32:47,798 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1442 transitions. Word has length 21 [2021-05-22 02:32:47,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:47,798 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1442 transitions. [2021-05-22 02:32:47,798 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:47,798 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1442 transitions. [2021-05-22 02:32:47,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:47,799 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:47,799 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:48,011 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 939 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5372 [2021-05-22 02:32:48,012 INFO L430 AbstractCegarLoop]: === Iteration 951 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:48,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:48,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1831122191, now seen corresponding path program 939 times [2021-05-22 02:32:48,012 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:48,012 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603372941] [2021-05-22 02:32:48,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:48,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:48,145 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:48,145 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:48,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603372941] [2021-05-22 02:32:48,145 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [603372941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:48,145 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633794558] [2021-05-22 02:32:48,145 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 940 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 940 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:48,178 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:32:48,178 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:48,179 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:32:48,179 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:48,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:48,281 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:48,286 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:48,290 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:48,294 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,342 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:48,344 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 4 xjuncts. [2021-05-22 02:32:48,345 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:125, output treesize:93 [2021-05-22 02:32:48,529 INFO L446 ElimStorePlain]: Different costs {1=[o_4], 3=[o_2]} [2021-05-22 02:32:48,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,532 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,532 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:48,533 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,536 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:48,537 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:48,572 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,572 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:48,573 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,576 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:48,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:48,577 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:48,612 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:48,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:48,615 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 5 variables, input treesize:89, output treesize:31 [2021-05-22 02:32:48,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:48,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633794558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:48,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:48,711 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:48,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114558259] [2021-05-22 02:32:48,711 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:48,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:48,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:48,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:48,712 INFO L87 Difference]: Start difference. First operand 461 states and 1442 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:49,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:49,138 INFO L93 Difference]: Finished difference Result 662 states and 2042 transitions. [2021-05-22 02:32:49,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:32:49,138 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:49,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:49,139 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:32:49,139 INFO L226 Difference]: Without dead ends: 643 [2021-05-22 02:32:49,140 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 517.3ms TimeCoverageRelationStatistics Valid=97, Invalid=365, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:32:49,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 643 states. [2021-05-22 02:32:49,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 643 to 457. [2021-05-22 02:32:49,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.1271929824561404) internal successors, (1426), 456 states have internal predecessors, (1426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:49,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1426 transitions. [2021-05-22 02:32:49,147 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1426 transitions. Word has length 21 [2021-05-22 02:32:49,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:49,147 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1426 transitions. [2021-05-22 02:32:49,147 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:49,147 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1426 transitions. [2021-05-22 02:32:49,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:49,148 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:49,148 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:49,369 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5379,940 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:49,369 INFO L430 AbstractCegarLoop]: === Iteration 952 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:49,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:49,369 INFO L82 PathProgramCache]: Analyzing trace with hash 102160303, now seen corresponding path program 940 times [2021-05-22 02:32:49,369 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:49,369 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181382645] [2021-05-22 02:32:49,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:49,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:49,505 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:49,505 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:49,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181382645] [2021-05-22 02:32:49,505 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [181382645] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:49,505 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [395924504] [2021-05-22 02:32:49,505 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 941 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 941 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:49,536 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:49,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:49,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:49,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:49,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:49,605 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:49,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:49,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:49,608 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:49,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:49,632 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:49,632 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:49,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:49,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:49,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:49,745 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:49,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:49,748 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:49,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:49,767 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:49,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:49,768 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:49,785 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:49,786 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:49,786 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:15 [2021-05-22 02:32:49,820 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:49,820 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [395924504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:49,820 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:49,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:49,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [262273057] [2021-05-22 02:32:49,821 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:49,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:49,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:49,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:49,821 INFO L87 Difference]: Start difference. First operand 457 states and 1426 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:50,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:50,034 INFO L93 Difference]: Finished difference Result 588 states and 1813 transitions. [2021-05-22 02:32:50,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:50,035 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:50,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:50,036 INFO L225 Difference]: With dead ends: 588 [2021-05-22 02:32:50,036 INFO L226 Difference]: Without dead ends: 559 [2021-05-22 02:32:50,036 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 219.3ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:50,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 559 states. [2021-05-22 02:32:50,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 559 to 457. [2021-05-22 02:32:50,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 456 states have (on average 3.1271929824561404) internal successors, (1426), 456 states have internal predecessors, (1426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:50,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 1426 transitions. [2021-05-22 02:32:50,042 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 1426 transitions. Word has length 21 [2021-05-22 02:32:50,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:50,042 INFO L482 AbstractCegarLoop]: Abstraction has 457 states and 1426 transitions. [2021-05-22 02:32:50,042 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:50,042 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 1426 transitions. [2021-05-22 02:32:50,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:50,043 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:50,043 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:50,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5390,941 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:50,264 INFO L430 AbstractCegarLoop]: === Iteration 953 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:50,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:50,265 INFO L82 PathProgramCache]: Analyzing trace with hash -992538615, now seen corresponding path program 941 times [2021-05-22 02:32:50,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:50,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064449241] [2021-05-22 02:32:50,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:50,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:50,392 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:50,392 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:50,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064449241] [2021-05-22 02:32:50,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064449241] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:50,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [168111952] [2021-05-22 02:32:50,392 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 942 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 942 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:50,423 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:32:50,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:50,424 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:50,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:50,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:50,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:50,483 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:50,494 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:50,495 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:50,495 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:50,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:50,599 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:50,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:50,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:50,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:50,604 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:50,620 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:50,622 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:50,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:50,623 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:50,639 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:50,641 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:50,641 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:57, output treesize:13 [2021-05-22 02:32:50,708 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:50,708 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [168111952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:50,708 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:50,708 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:50,708 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706188759] [2021-05-22 02:32:50,708 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:50,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:50,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:50,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:50,709 INFO L87 Difference]: Start difference. First operand 457 states and 1426 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:51,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:51,262 INFO L93 Difference]: Finished difference Result 816 states and 2477 transitions. [2021-05-22 02:32:51,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:32:51,262 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:51,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:51,264 INFO L225 Difference]: With dead ends: 816 [2021-05-22 02:32:51,264 INFO L226 Difference]: Without dead ends: 762 [2021-05-22 02:32:51,264 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 454.1ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:32:51,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 762 states. [2021-05-22 02:32:51,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 762 to 458. [2021-05-22 02:32:51,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.148796498905908) internal successors, (1439), 457 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:51,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1439 transitions. [2021-05-22 02:32:51,271 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1439 transitions. Word has length 21 [2021-05-22 02:32:51,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:51,271 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1439 transitions. [2021-05-22 02:32:51,272 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:51,272 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1439 transitions. [2021-05-22 02:32:51,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:51,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:51,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:51,488 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5402,942 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:51,489 INFO L430 AbstractCegarLoop]: === Iteration 954 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:51,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:51,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1616824379, now seen corresponding path program 942 times [2021-05-22 02:32:51,489 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:51,489 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335481861] [2021-05-22 02:32:51,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:51,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:51,608 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:51,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:51,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335481861] [2021-05-22 02:32:51,609 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1335481861] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:51,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176182084] [2021-05-22 02:32:51,609 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 943 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 943 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:51,639 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:32:51,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:51,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:51,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:51,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:51,709 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:51,711 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:51,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:51,712 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:51,734 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:51,736 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:51,737 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:51,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:51,792 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:51,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:51,794 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:51,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:51,797 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:51,819 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:51,822 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:51,823 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:51,823 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:51,845 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:51,847 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:51,847 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:32:51,893 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:51,893 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176182084] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:51,893 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:51,893 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:51,893 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134832386] [2021-05-22 02:32:51,893 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:51,893 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:51,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:51,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:51,894 INFO L87 Difference]: Start difference. First operand 458 states and 1439 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:52,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:52,069 INFO L93 Difference]: Finished difference Result 596 states and 1843 transitions. [2021-05-22 02:32:52,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:52,069 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:52,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:52,070 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:32:52,070 INFO L226 Difference]: Without dead ends: 567 [2021-05-22 02:32:52,071 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 198.6ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:52,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-22 02:32:52,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 458. [2021-05-22 02:32:52,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.148796498905908) internal successors, (1439), 457 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:52,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1439 transitions. [2021-05-22 02:32:52,077 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1439 transitions. Word has length 21 [2021-05-22 02:32:52,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:52,077 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1439 transitions. [2021-05-22 02:32:52,077 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:52,077 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1439 transitions. [2021-05-22 02:32:52,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:52,078 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:52,078 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:52,296 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 943 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5415 [2021-05-22 02:32:52,297 INFO L430 AbstractCegarLoop]: === Iteration 955 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:52,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:52,297 INFO L82 PathProgramCache]: Analyzing trace with hash -1319557969, now seen corresponding path program 943 times [2021-05-22 02:32:52,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:52,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835247575] [2021-05-22 02:32:52,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:52,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:52,429 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:52,430 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:52,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835247575] [2021-05-22 02:32:52,430 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835247575] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:52,430 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576260794] [2021-05-22 02:32:52,430 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 944 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 944 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:52,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:52,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:52,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:52,537 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:52,538 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:52,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:52,539 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:52,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:52,542 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:52,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:52,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:52,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:52,620 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:52,621 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:52,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:52,622 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:52,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:52,643 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:52,666 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:52,669 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:52,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:52,671 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:52,694 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:52,695 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:52,695 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:32:52,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:52,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576260794] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:52,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:52,796 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:52,796 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065249486] [2021-05-22 02:32:52,796 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:52,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:52,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:52,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:52,796 INFO L87 Difference]: Start difference. First operand 458 states and 1439 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:53,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:53,347 INFO L93 Difference]: Finished difference Result 746 states and 2292 transitions. [2021-05-22 02:32:53,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:32:53,347 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:53,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:53,349 INFO L225 Difference]: With dead ends: 746 [2021-05-22 02:32:53,349 INFO L226 Difference]: Without dead ends: 723 [2021-05-22 02:32:53,349 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 479.8ms TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:32:53,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 723 states. [2021-05-22 02:32:53,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 723 to 458. [2021-05-22 02:32:53,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.148796498905908) internal successors, (1439), 457 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:53,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1439 transitions. [2021-05-22 02:32:53,357 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1439 transitions. Word has length 21 [2021-05-22 02:32:53,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:53,357 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1439 transitions. [2021-05-22 02:32:53,357 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:53,357 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1439 transitions. [2021-05-22 02:32:53,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:53,358 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:53,358 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:53,576 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 944 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5421 [2021-05-22 02:32:53,577 INFO L430 AbstractCegarLoop]: === Iteration 956 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:53,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:53,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1686814705, now seen corresponding path program 944 times [2021-05-22 02:32:53,577 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:53,577 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [642201775] [2021-05-22 02:32:53,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:53,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:53,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:53,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:53,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [642201775] [2021-05-22 02:32:53,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [642201775] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:53,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1699911268] [2021-05-22 02:32:53,710 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 945 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 945 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:53,740 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:53,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:53,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:53,742 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:53,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:53,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:53,800 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:53,811 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:53,812 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:53,812 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:53,873 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:53,874 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:53,874 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:53,875 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:53,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:53,879 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:53,900 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:53,902 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:53,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:53,903 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:53,926 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:53,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:53,928 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:32:54,030 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:54,031 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1699911268] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:54,031 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:54,031 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:54,031 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [206278523] [2021-05-22 02:32:54,031 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:54,031 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:54,031 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:54,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:54,031 INFO L87 Difference]: Start difference. First operand 458 states and 1439 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:54,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:54,560 INFO L93 Difference]: Finished difference Result 725 states and 2211 transitions. [2021-05-22 02:32:54,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:32:54,560 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:54,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:54,561 INFO L225 Difference]: With dead ends: 725 [2021-05-22 02:32:54,561 INFO L226 Difference]: Without dead ends: 698 [2021-05-22 02:32:54,561 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 418.1ms TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:32:54,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-22 02:32:54,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 453. [2021-05-22 02:32:54,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1261061946902653) internal successors, (1413), 452 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:54,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1413 transitions. [2021-05-22 02:32:54,569 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1413 transitions. Word has length 21 [2021-05-22 02:32:54,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:54,569 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1413 transitions. [2021-05-22 02:32:54,569 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:54,569 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1413 transitions. [2021-05-22 02:32:54,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:54,569 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:54,570 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:54,788 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 945 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5432 [2021-05-22 02:32:54,789 INFO L430 AbstractCegarLoop]: === Iteration 957 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:54,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:54,789 INFO L82 PathProgramCache]: Analyzing trace with hash -220437201, now seen corresponding path program 945 times [2021-05-22 02:32:54,789 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:54,789 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [288725805] [2021-05-22 02:32:54,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:54,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:54,911 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:54,911 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:54,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [288725805] [2021-05-22 02:32:54,911 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [288725805] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:54,911 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1816803296] [2021-05-22 02:32:54,911 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 946 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 946 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:54,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:32:54,943 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:54,943 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:54,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:55,011 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,011 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:55,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:55,016 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,038 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:55,040 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:55,122 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:55,124 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,136 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,138 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:55,139 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,151 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,152 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,152 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:12 [2021-05-22 02:32:55,168 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:55,169 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1816803296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:55,169 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:55,169 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:55,169 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259645301] [2021-05-22 02:32:55,169 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:55,169 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:55,169 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:55,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:55,169 INFO L87 Difference]: Start difference. First operand 453 states and 1413 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:55,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:55,359 INFO L93 Difference]: Finished difference Result 569 states and 1754 transitions. [2021-05-22 02:32:55,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:55,359 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:55,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:55,360 INFO L225 Difference]: With dead ends: 569 [2021-05-22 02:32:55,360 INFO L226 Difference]: Without dead ends: 547 [2021-05-22 02:32:55,360 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 197.8ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:55,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-05-22 02:32:55,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 456. [2021-05-22 02:32:55,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.131868131868132) internal successors, (1425), 455 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:55,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1425 transitions. [2021-05-22 02:32:55,367 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1425 transitions. Word has length 21 [2021-05-22 02:32:55,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:55,367 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1425 transitions. [2021-05-22 02:32:55,367 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:55,367 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1425 transitions. [2021-05-22 02:32:55,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:55,368 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:55,368 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:55,588 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5444,946 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:55,589 INFO L430 AbstractCegarLoop]: === Iteration 958 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:55,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:55,589 INFO L82 PathProgramCache]: Analyzing trace with hash 404886917, now seen corresponding path program 946 times [2021-05-22 02:32:55,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:55,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1875478439] [2021-05-22 02:32:55,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:55,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:55,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:55,690 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:55,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1875478439] [2021-05-22 02:32:55,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1875478439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:55,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615983790] [2021-05-22 02:32:55,690 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 947 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 947 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:55,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:32:55,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:55,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:55,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:55,778 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:55,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,790 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,792 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:55,792 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:55,883 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:55,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,886 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,886 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:55,887 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,907 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:55,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:55,908 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:55,926 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:55,927 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:55,928 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:61, output treesize:13 [2021-05-22 02:32:55,951 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:55,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615983790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:55,951 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:55,951 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:55,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021684482] [2021-05-22 02:32:55,952 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:55,952 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:55,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:55,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:55,952 INFO L87 Difference]: Start difference. First operand 456 states and 1425 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:56,207 INFO L93 Difference]: Finished difference Result 562 states and 1724 transitions. [2021-05-22 02:32:56,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:56,207 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:56,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:56,208 INFO L225 Difference]: With dead ends: 562 [2021-05-22 02:32:56,208 INFO L226 Difference]: Without dead ends: 535 [2021-05-22 02:32:56,208 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 175.7ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:56,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 535 states. [2021-05-22 02:32:56,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 535 to 456. [2021-05-22 02:32:56,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1274725274725275) internal successors, (1423), 455 states have internal predecessors, (1423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1423 transitions. [2021-05-22 02:32:56,215 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1423 transitions. Word has length 21 [2021-05-22 02:32:56,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:56,215 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1423 transitions. [2021-05-22 02:32:56,215 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,215 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1423 transitions. [2021-05-22 02:32:56,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:56,216 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:56,216 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:56,432 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5448,947 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:56,433 INFO L430 AbstractCegarLoop]: === Iteration 959 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:56,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:56,433 INFO L82 PathProgramCache]: Analyzing trace with hash 120624233, now seen corresponding path program 947 times [2021-05-22 02:32:56,433 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:56,433 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759604479] [2021-05-22 02:32:56,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:56,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:56,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:56,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:56,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759604479] [2021-05-22 02:32:56,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759604479] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:56,524 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371091857] [2021-05-22 02:32:56,524 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 948 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 948 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:56,550 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:56,550 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:56,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:56,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:56,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:56,613 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:56,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:56,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:56,615 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:56,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:56,630 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:56,630 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:56,716 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:56,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:56,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:56,718 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:56,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:56,721 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:56,735 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:56,737 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:56,737 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:56,738 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:56,751 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:56,752 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:56,752 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:32:56,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:56,782 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371091857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:56,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:56,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:56,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1265462593] [2021-05-22 02:32:56,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:56,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:56,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:56,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:56,783 INFO L87 Difference]: Start difference. First operand 456 states and 1423 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:56,970 INFO L93 Difference]: Finished difference Result 615 states and 1871 transitions. [2021-05-22 02:32:56,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:32:56,970 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:56,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:56,971 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:32:56,971 INFO L226 Difference]: Without dead ends: 588 [2021-05-22 02:32:56,971 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 196.3ms TimeCoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:56,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 588 states. [2021-05-22 02:32:56,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 588 to 469. [2021-05-22 02:32:56,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.123931623931624) internal successors, (1462), 468 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1462 transitions. [2021-05-22 02:32:56,976 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1462 transitions. Word has length 21 [2021-05-22 02:32:56,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:56,977 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1462 transitions. [2021-05-22 02:32:56,977 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:56,977 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1462 transitions. [2021-05-22 02:32:56,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:56,977 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:56,977 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:57,177 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 948 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5454 [2021-05-22 02:32:57,178 INFO L430 AbstractCegarLoop]: === Iteration 960 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:57,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:57,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1807016073, now seen corresponding path program 948 times [2021-05-22 02:32:57,178 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:57,178 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213227967] [2021-05-22 02:32:57,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:57,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:57,258 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:57,258 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:57,258 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213227967] [2021-05-22 02:32:57,258 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213227967] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:57,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [741774867] [2021-05-22 02:32:57,259 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 949 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 949 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:57,284 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:32:57,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:57,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:57,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:57,345 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:57,346 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:57,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:57,347 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:57,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:57,350 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:57,363 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:57,364 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:57,364 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:57,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:57,464 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:57,465 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:57,472 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:57,473 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:57,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:57,474 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:57,481 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:57,482 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:32:57,482 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:36, output treesize:7 [2021-05-22 02:32:57,493 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:57,493 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [741774867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:57,493 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:57,493 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:32:57,493 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1625883733] [2021-05-22 02:32:57,493 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:32:57,493 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:57,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:32:57,494 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:57,494 INFO L87 Difference]: Start difference. First operand 469 states and 1462 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:57,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:57,703 INFO L93 Difference]: Finished difference Result 544 states and 1664 transitions. [2021-05-22 02:32:57,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:57,703 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:57,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:57,704 INFO L225 Difference]: With dead ends: 544 [2021-05-22 02:32:57,704 INFO L226 Difference]: Without dead ends: 523 [2021-05-22 02:32:57,704 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 186.3ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:32:57,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 523 states. [2021-05-22 02:32:57,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 523 to 459. [2021-05-22 02:32:57,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.1331877729257642) internal successors, (1435), 458 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:57,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1435 transitions. [2021-05-22 02:32:57,709 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1435 transitions. Word has length 21 [2021-05-22 02:32:57,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:57,709 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1435 transitions. [2021-05-22 02:32:57,709 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:57,709 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1435 transitions. [2021-05-22 02:32:57,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:57,709 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:57,709 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:57,910 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 949 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5471 [2021-05-22 02:32:57,910 INFO L430 AbstractCegarLoop]: === Iteration 961 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:57,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:57,910 INFO L82 PathProgramCache]: Analyzing trace with hash 1829520445, now seen corresponding path program 949 times [2021-05-22 02:32:57,910 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:57,910 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886757948] [2021-05-22 02:32:57,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:57,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:58,000 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:58,000 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:58,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886757948] [2021-05-22 02:32:58,000 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1886757948] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:58,000 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1279274936] [2021-05-22 02:32:58,000 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 950 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 950 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:58,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:58,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:58,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:58,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:58,085 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:58,088 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,105 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,107 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:58,107 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:63, output treesize:39 [2021-05-22 02:32:58,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:58,149 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,151 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:58,152 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,169 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,171 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:32:58,172 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,187 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,188 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:58,188 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:21 [2021-05-22 02:32:58,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:58,222 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1279274936] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:58,222 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:58,222 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:58,222 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378442048] [2021-05-22 02:32:58,222 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:58,222 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:58,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:58,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:58,222 INFO L87 Difference]: Start difference. First operand 459 states and 1435 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:58,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:58,375 INFO L93 Difference]: Finished difference Result 587 states and 1813 transitions. [2021-05-22 02:32:58,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:58,375 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:58,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:58,376 INFO L225 Difference]: With dead ends: 587 [2021-05-22 02:32:58,376 INFO L226 Difference]: Without dead ends: 558 [2021-05-22 02:32:58,376 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 147.3ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:58,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 558 states. [2021-05-22 02:32:58,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 558 to 459. [2021-05-22 02:32:58,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.1331877729257642) internal successors, (1435), 458 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:58,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1435 transitions. [2021-05-22 02:32:58,381 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1435 transitions. Word has length 21 [2021-05-22 02:32:58,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:58,381 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1435 transitions. [2021-05-22 02:32:58,381 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:58,381 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1435 transitions. [2021-05-22 02:32:58,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:58,382 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:58,382 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:58,582 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 950 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5483 [2021-05-22 02:32:58,582 INFO L430 AbstractCegarLoop]: === Iteration 962 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:58,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:58,582 INFO L82 PathProgramCache]: Analyzing trace with hash 2126786855, now seen corresponding path program 950 times [2021-05-22 02:32:58,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:58,583 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126839489] [2021-05-22 02:32:58,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:58,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:58,662 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:58,663 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:58,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126839489] [2021-05-22 02:32:58,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126839489] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:58,663 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1278091220] [2021-05-22 02:32:58,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 951 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 951 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:58,688 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:32:58,688 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:58,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:58,689 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:58,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:58,733 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,742 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:32:58,742 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:39, output treesize:32 [2021-05-22 02:32:58,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:32:58,789 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,791 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,792 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:58,792 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,809 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,811 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:58,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:58,812 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:58,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:58,829 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:58,829 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:67, output treesize:19 [2021-05-22 02:32:58,872 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:58,872 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1278091220] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:58,872 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:58,872 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:32:58,872 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988537601] [2021-05-22 02:32:58,872 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:32:58,872 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:58,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:32:58,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:32:58,872 INFO L87 Difference]: Start difference. First operand 459 states and 1435 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:59,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:32:59,038 INFO L93 Difference]: Finished difference Result 552 states and 1699 transitions. [2021-05-22 02:32:59,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:32:59,038 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:32:59,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:32:59,039 INFO L225 Difference]: With dead ends: 552 [2021-05-22 02:32:59,039 INFO L226 Difference]: Without dead ends: 529 [2021-05-22 02:32:59,039 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 151.8ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:32:59,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-05-22 02:32:59,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 458. [2021-05-22 02:32:59,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1422319474835887) internal successors, (1436), 457 states have internal predecessors, (1436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:59,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1436 transitions. [2021-05-22 02:32:59,044 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1436 transitions. Word has length 21 [2021-05-22 02:32:59,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:32:59,044 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1436 transitions. [2021-05-22 02:32:59,044 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:32:59,044 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1436 transitions. [2021-05-22 02:32:59,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:32:59,045 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:32:59,045 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:32:59,245 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5489,951 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:59,245 INFO L430 AbstractCegarLoop]: === Iteration 963 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:32:59,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:32:59,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1842524171, now seen corresponding path program 951 times [2021-05-22 02:32:59,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:32:59,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [90771059] [2021-05-22 02:32:59,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:32:59,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:32:59,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:59,351 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:32:59,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [90771059] [2021-05-22 02:32:59,351 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [90771059] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:59,351 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1835951960] [2021-05-22 02:32:59,351 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 952 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 952 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:32:59,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:32:59,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:32:59,377 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:32:59,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:32:59,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:59,443 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:59,445 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:59,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:32:59,446 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:59,459 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:59,460 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:32:59,460 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:32:59,504 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:59,504 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:59,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:32:59,505 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:59,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:32:59,508 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:59,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:59,527 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:32:59,527 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:32:59,528 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:32:59,544 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:32:59,545 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:32:59,545 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:65, output treesize:19 [2021-05-22 02:32:59,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:32:59,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1835951960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:32:59,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:32:59,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:32:59,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [996494001] [2021-05-22 02:32:59,621 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:32:59,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:32:59,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:32:59,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:32:59,621 INFO L87 Difference]: Start difference. First operand 458 states and 1436 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:00,013 INFO L93 Difference]: Finished difference Result 733 states and 2230 transitions. [2021-05-22 02:33:00,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:33:00,013 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:00,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:00,014 INFO L225 Difference]: With dead ends: 733 [2021-05-22 02:33:00,014 INFO L226 Difference]: Without dead ends: 706 [2021-05-22 02:33:00,014 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 381.7ms TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:33:00,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-05-22 02:33:00,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 469. [2021-05-22 02:33:00,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1452991452991452) internal successors, (1472), 468 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1472 transitions. [2021-05-22 02:33:00,019 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1472 transitions. Word has length 21 [2021-05-22 02:33:00,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:00,020 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1472 transitions. [2021-05-22 02:33:00,020 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,020 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1472 transitions. [2021-05-22 02:33:00,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:00,020 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:00,020 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:00,220 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 952 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5498 [2021-05-22 02:33:00,221 INFO L430 AbstractCegarLoop]: === Iteration 964 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:00,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:00,221 INFO L82 PathProgramCache]: Analyzing trace with hash -376753335, now seen corresponding path program 952 times [2021-05-22 02:33:00,221 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:00,221 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684746226] [2021-05-22 02:33:00,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:00,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:00,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:00,324 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:00,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684746226] [2021-05-22 02:33:00,324 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684746226] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:00,324 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [123295613] [2021-05-22 02:33:00,324 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 953 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 953 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:00,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:00,348 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:00,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:00,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:00,419 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:00,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:00,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:00,421 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:00,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:00,423 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:00,436 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:00,438 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:00,438 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:53, output treesize:37 [2021-05-22 02:33:00,494 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:00,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:00,495 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:00,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:00,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:00,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:00,506 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:00,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:00,515 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:00,515 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:39, output treesize:10 [2021-05-22 02:33:00,560 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:00,560 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [123295613] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:00,560 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:00,560 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:00,560 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1064703996] [2021-05-22 02:33:00,560 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:00,560 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:00,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:00,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:00,561 INFO L87 Difference]: Start difference. First operand 469 states and 1472 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:00,867 INFO L93 Difference]: Finished difference Result 656 states and 2010 transitions. [2021-05-22 02:33:00,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:00,867 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:00,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:00,868 INFO L225 Difference]: With dead ends: 656 [2021-05-22 02:33:00,868 INFO L226 Difference]: Without dead ends: 635 [2021-05-22 02:33:00,868 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 287.8ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:00,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 635 states. [2021-05-22 02:33:00,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 635 to 452. [2021-05-22 02:33:00,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.1241685144124167) internal successors, (1409), 451 states have internal predecessors, (1409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1409 transitions. [2021-05-22 02:33:00,873 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1409 transitions. Word has length 21 [2021-05-22 02:33:00,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:00,873 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1409 transitions. [2021-05-22 02:33:00,873 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:00,873 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1409 transitions. [2021-05-22 02:33:00,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:00,874 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:00,874 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:01,074 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5513,953 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:01,074 INFO L430 AbstractCegarLoop]: === Iteration 965 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:01,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:01,074 INFO L82 PathProgramCache]: Analyzing trace with hash -1702446969, now seen corresponding path program 953 times [2021-05-22 02:33:01,075 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:01,075 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [579812886] [2021-05-22 02:33:01,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:01,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:01,166 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:01,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [579812886] [2021-05-22 02:33:01,166 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [579812886] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:01,166 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1493329003] [2021-05-22 02:33:01,166 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 954 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 954 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:01,190 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:01,190 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:01,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:01,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:01,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:01,234 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,236 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:01,237 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:01,249 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:33:01,312 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:01,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:01,314 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,319 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,320 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,320 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:01,321 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,325 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,326 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,326 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:9 [2021-05-22 02:33:01,334 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:01,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1493329003] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:01,334 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:01,334 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:01,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81874793] [2021-05-22 02:33:01,334 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:01,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:01,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:01,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:01,334 INFO L87 Difference]: Start difference. First operand 452 states and 1409 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:01,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:01,471 INFO L93 Difference]: Finished difference Result 541 states and 1668 transitions. [2021-05-22 02:33:01,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:01,471 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:01,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:01,472 INFO L225 Difference]: With dead ends: 541 [2021-05-22 02:33:01,472 INFO L226 Difference]: Without dead ends: 519 [2021-05-22 02:33:01,472 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 152.4ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:01,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-05-22 02:33:01,476 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 463. [2021-05-22 02:33:01,476 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1363636363636362) internal successors, (1449), 462 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:01,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1449 transitions. [2021-05-22 02:33:01,477 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1449 transitions. Word has length 21 [2021-05-22 02:33:01,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:01,477 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1449 transitions. [2021-05-22 02:33:01,477 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:01,477 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1449 transitions. [2021-05-22 02:33:01,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:01,477 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:01,477 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:01,678 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 954 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5520 [2021-05-22 02:33:01,678 INFO L430 AbstractCegarLoop]: === Iteration 966 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:01,678 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:01,678 INFO L82 PathProgramCache]: Analyzing trace with hash 2090728991, now seen corresponding path program 954 times [2021-05-22 02:33:01,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:01,678 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [757741311] [2021-05-22 02:33:01,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:01,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:01,763 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:01,763 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:01,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [757741311] [2021-05-22 02:33:01,763 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [757741311] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:01,763 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [697364061] [2021-05-22 02:33:01,763 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 955 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 955 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:01,787 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:01,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:01,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:01,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:01,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,850 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:01,851 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:01,854 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,870 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:01,870 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:33:01,939 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:01,940 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,951 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:01,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:01,952 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,959 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:01,960 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:01,960 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:40, output treesize:12 [2021-05-22 02:33:01,979 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:01,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [697364061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:01,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:01,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:01,980 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998225661] [2021-05-22 02:33:01,980 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:01,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:01,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:01,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:01,980 INFO L87 Difference]: Start difference. First operand 463 states and 1449 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:02,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:02,135 INFO L93 Difference]: Finished difference Result 550 states and 1692 transitions. [2021-05-22 02:33:02,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:02,136 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:02,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:02,136 INFO L225 Difference]: With dead ends: 550 [2021-05-22 02:33:02,137 INFO L226 Difference]: Without dead ends: 528 [2021-05-22 02:33:02,137 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 154.9ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:02,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 528 states. [2021-05-22 02:33:02,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 528 to 460. [2021-05-22 02:33:02,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.130718954248366) internal successors, (1437), 459 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:02,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1437 transitions. [2021-05-22 02:33:02,141 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1437 transitions. Word has length 21 [2021-05-22 02:33:02,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:02,141 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1437 transitions. [2021-05-22 02:33:02,141 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:02,141 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1437 transitions. [2021-05-22 02:33:02,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:02,142 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:02,142 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:02,342 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5526,955 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:02,342 INFO L430 AbstractCegarLoop]: === Iteration 967 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:02,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:02,342 INFO L82 PathProgramCache]: Analyzing trace with hash -1077122851, now seen corresponding path program 955 times [2021-05-22 02:33:02,342 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:02,343 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [929869325] [2021-05-22 02:33:02,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:02,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:02,440 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:02,440 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:02,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [929869325] [2021-05-22 02:33:02,440 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [929869325] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:02,440 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [282932835] [2021-05-22 02:33:02,440 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 956 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 956 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:02,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:02,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:02,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:02,534 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[v_prenex_273]} [2021-05-22 02:33:02,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:02,537 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:02,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:02,553 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:02,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:02,554 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:02,566 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:02,567 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:02,567 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:33:02,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:02,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:02,672 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:02,678 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:02,680 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:02,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:02,681 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:02,686 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:02,687 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:02,687 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:35, output treesize:7 [2021-05-22 02:33:02,715 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:02,715 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [282932835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:02,715 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:02,715 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:02,715 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006414843] [2021-05-22 02:33:02,715 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:02,715 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:02,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:02,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:02,715 INFO L87 Difference]: Start difference. First operand 460 states and 1437 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:03,194 INFO L93 Difference]: Finished difference Result 672 states and 2064 transitions. [2021-05-22 02:33:03,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:03,195 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:03,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:03,195 INFO L225 Difference]: With dead ends: 672 [2021-05-22 02:33:03,195 INFO L226 Difference]: Without dead ends: 653 [2021-05-22 02:33:03,196 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 407.7ms TimeCoverageRelationStatistics Valid=116, Invalid=436, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:03,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-05-22 02:33:03,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 470. [2021-05-22 02:33:03,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1471215351812365) internal successors, (1476), 469 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1476 transitions. [2021-05-22 02:33:03,200 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1476 transitions. Word has length 21 [2021-05-22 02:33:03,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:03,201 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1476 transitions. [2021-05-22 02:33:03,201 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,201 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1476 transitions. [2021-05-22 02:33:03,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:03,201 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:03,201 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:03,401 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 956 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5530 [2021-05-22 02:33:03,402 INFO L430 AbstractCegarLoop]: === Iteration 968 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:03,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:03,402 INFO L82 PathProgramCache]: Analyzing trace with hash -1299331463, now seen corresponding path program 956 times [2021-05-22 02:33:03,402 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:03,402 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100668068] [2021-05-22 02:33:03,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:03,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:03,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:03,504 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:03,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100668068] [2021-05-22 02:33:03,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100668068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:03,504 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676830731] [2021-05-22 02:33:03,504 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 957 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 957 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:03,530 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:03,530 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:03,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:03,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:03,570 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:03,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:03,571 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:03,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:03,578 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:03,578 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:33:03,642 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:03,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:03,645 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:03,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:03,647 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:03,656 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:03,658 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:03,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:03,659 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:03,667 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:03,668 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:03,668 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:45, output treesize:5 [2021-05-22 02:33:03,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:03,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676830731] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:03,694 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:03,694 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:03,695 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067306027] [2021-05-22 02:33:03,695 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:03,695 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:03,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:03,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:03,695 INFO L87 Difference]: Start difference. First operand 470 states and 1476 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:03,971 INFO L93 Difference]: Finished difference Result 753 states and 2299 transitions. [2021-05-22 02:33:03,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:03,972 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:03,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:03,973 INFO L225 Difference]: With dead ends: 753 [2021-05-22 02:33:03,973 INFO L226 Difference]: Without dead ends: 693 [2021-05-22 02:33:03,973 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 231.5ms TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:03,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-05-22 02:33:03,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 470. [2021-05-22 02:33:03,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.136460554371002) internal successors, (1471), 469 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1471 transitions. [2021-05-22 02:33:03,978 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1471 transitions. Word has length 21 [2021-05-22 02:33:03,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:03,978 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1471 transitions. [2021-05-22 02:33:03,978 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:03,978 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1471 transitions. [2021-05-22 02:33:03,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:03,979 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:03,979 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:04,179 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5538,957 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:04,179 INFO L430 AbstractCegarLoop]: === Iteration 969 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:04,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:04,179 INFO L82 PathProgramCache]: Analyzing trace with hash 609268989, now seen corresponding path program 957 times [2021-05-22 02:33:04,180 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:04,180 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143441189] [2021-05-22 02:33:04,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:04,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:04,286 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:04,286 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:04,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143441189] [2021-05-22 02:33:04,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143441189] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:04,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984791401] [2021-05-22 02:33:04,287 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 958 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 958 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:04,312 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:04,313 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:04,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:04,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:04,355 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:04,356 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:04,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:04,357 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:04,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:04,359 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:04,370 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:04,371 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:04,371 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:33:04,426 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:04,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:04,429 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:04,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:04,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:04,443 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:04,445 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:04,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:04,446 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:04,457 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:04,458 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:04,458 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:33:04,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:04,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984791401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:04,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:04,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:04,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076391029] [2021-05-22 02:33:04,504 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:04,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:04,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:04,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:04,504 INFO L87 Difference]: Start difference. First operand 470 states and 1471 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:04,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:04,839 INFO L93 Difference]: Finished difference Result 778 states and 2368 transitions. [2021-05-22 02:33:04,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:33:04,840 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:04,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:04,841 INFO L225 Difference]: With dead ends: 778 [2021-05-22 02:33:04,841 INFO L226 Difference]: Without dead ends: 755 [2021-05-22 02:33:04,841 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 310.7ms TimeCoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:04,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 755 states. [2021-05-22 02:33:04,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 755 to 474. [2021-05-22 02:33:04,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1353065539112053) internal successors, (1483), 473 states have internal predecessors, (1483), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:04,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1483 transitions. [2021-05-22 02:33:04,847 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1483 transitions. Word has length 21 [2021-05-22 02:33:04,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:04,847 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1483 transitions. [2021-05-22 02:33:04,847 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:04,847 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1483 transitions. [2021-05-22 02:33:04,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:04,847 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:04,847 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:05,048 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5545,958 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:05,048 INFO L430 AbstractCegarLoop]: === Iteration 970 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:05,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:05,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1388859393, now seen corresponding path program 958 times [2021-05-22 02:33:05,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:05,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624256638] [2021-05-22 02:33:05,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:05,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:05,151 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:05,151 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:05,151 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624256638] [2021-05-22 02:33:05,151 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [624256638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:05,152 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [376732196] [2021-05-22 02:33:05,152 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 959 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 959 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:05,177 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:05,177 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:05,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:05,178 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:05,246 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_274], 1=[o_0]} [2021-05-22 02:33:05,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:05,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:05,263 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:05,265 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:05,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:05,266 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:05,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:05,279 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:05,279 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:33:05,347 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:05,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:05,348 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:05,355 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:05,357 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:05,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:05,358 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:05,365 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:05,366 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:05,366 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:33:05,409 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:05,409 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [376732196] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:05,409 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:05,409 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:05,409 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660144200] [2021-05-22 02:33:05,409 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:05,409 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:05,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:05,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:05,410 INFO L87 Difference]: Start difference. First operand 474 states and 1483 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:05,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:05,761 INFO L93 Difference]: Finished difference Result 672 states and 2059 transitions. [2021-05-22 02:33:05,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:05,761 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:05,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:05,762 INFO L225 Difference]: With dead ends: 672 [2021-05-22 02:33:05,762 INFO L226 Difference]: Without dead ends: 653 [2021-05-22 02:33:05,762 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 341.2ms TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:05,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-05-22 02:33:05,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 470. [2021-05-22 02:33:05,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1279317697228146) internal successors, (1467), 469 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:05,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1467 transitions. [2021-05-22 02:33:05,767 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1467 transitions. Word has length 21 [2021-05-22 02:33:05,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:05,767 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1467 transitions. [2021-05-22 02:33:05,768 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:05,768 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1467 transitions. [2021-05-22 02:33:05,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:05,768 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:05,768 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:05,968 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 959 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5553 [2021-05-22 02:33:05,969 INFO L430 AbstractCegarLoop]: === Iteration 971 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:05,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:05,969 INFO L82 PathProgramCache]: Analyzing trace with hash 1177146015, now seen corresponding path program 959 times [2021-05-22 02:33:05,969 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:05,969 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435071741] [2021-05-22 02:33:05,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:05,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:06,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:06,062 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:06,062 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435071741] [2021-05-22 02:33:06,062 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435071741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:06,063 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [875389625] [2021-05-22 02:33:06,063 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 960 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 960 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:06,089 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:06,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:06,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:06,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:06,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:06,141 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,142 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:06,143 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,155 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,156 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:06,156 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:33:06,214 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:06,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:06,217 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:06,220 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,232 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,234 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:06,234 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,246 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,246 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:06,247 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:33:06,272 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:06,272 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [875389625] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:06,272 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:06,272 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:06,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103759806] [2021-05-22 02:33:06,272 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:06,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:06,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:06,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:06,273 INFO L87 Difference]: Start difference. First operand 470 states and 1467 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:06,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:06,396 INFO L93 Difference]: Finished difference Result 596 states and 1840 transitions. [2021-05-22 02:33:06,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:06,397 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:06,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:06,397 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:33:06,398 INFO L226 Difference]: Without dead ends: 567 [2021-05-22 02:33:06,398 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 167.1ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:06,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-22 02:33:06,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 470. [2021-05-22 02:33:06,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1279317697228146) internal successors, (1467), 469 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:06,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1467 transitions. [2021-05-22 02:33:06,402 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1467 transitions. Word has length 21 [2021-05-22 02:33:06,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:06,402 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1467 transitions. [2021-05-22 02:33:06,403 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:06,403 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1467 transitions. [2021-05-22 02:33:06,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:06,403 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:06,403 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:06,603 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5558,960 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:06,604 INFO L430 AbstractCegarLoop]: === Iteration 972 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:06,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:06,604 INFO L82 PathProgramCache]: Analyzing trace with hash 82447097, now seen corresponding path program 960 times [2021-05-22 02:33:06,604 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:06,604 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597214038] [2021-05-22 02:33:06,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:06,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:06,685 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:06,685 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:06,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597214038] [2021-05-22 02:33:06,685 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597214038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:06,685 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650246933] [2021-05-22 02:33:06,685 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 961 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 961 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:06,711 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:33:06,711 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:06,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:06,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:06,760 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:06,761 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,769 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,770 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:06,770 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:33:06,850 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:06,852 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:06,856 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,875 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,877 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:06,877 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:06,878 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:06,895 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:06,897 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:06,897 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:59, output treesize:13 [2021-05-22 02:33:06,918 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:06,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650246933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:06,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:06,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:06,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229295973] [2021-05-22 02:33:06,919 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:06,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:06,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:06,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:06,919 INFO L87 Difference]: Start difference. First operand 470 states and 1467 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:07,126 INFO L93 Difference]: Finished difference Result 559 states and 1723 transitions. [2021-05-22 02:33:07,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:07,126 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:07,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:07,127 INFO L225 Difference]: With dead ends: 559 [2021-05-22 02:33:07,127 INFO L226 Difference]: Without dead ends: 532 [2021-05-22 02:33:07,127 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 150.4ms TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:07,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-22 02:33:07,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 467. [2021-05-22 02:33:07,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.130901287553648) internal successors, (1459), 466 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1459 transitions. [2021-05-22 02:33:07,134 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1459 transitions. Word has length 21 [2021-05-22 02:33:07,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:07,134 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1459 transitions. [2021-05-22 02:33:07,134 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,134 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1459 transitions. [2021-05-22 02:33:07,135 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:07,135 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:07,135 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:07,356 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5567,961 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:07,357 INFO L430 AbstractCegarLoop]: === Iteration 973 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:07,357 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:07,357 INFO L82 PathProgramCache]: Analyzing trace with hash -541838667, now seen corresponding path program 961 times [2021-05-22 02:33:07,357 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:07,357 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [17711303] [2021-05-22 02:33:07,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:07,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:07,447 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:07,447 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:07,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [17711303] [2021-05-22 02:33:07,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [17711303] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:07,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208854960] [2021-05-22 02:33:07,447 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 962 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 962 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:07,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:07,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:07,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:07,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:07,530 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:07,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:07,531 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:07,534 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:07,534 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:07,550 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:07,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:07,551 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:42 [2021-05-22 02:33:07,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:07,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:07,608 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:07,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:07,609 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:07,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:07,627 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:07,627 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:07,628 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:07,642 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:07,643 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:07,643 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:70, output treesize:21 [2021-05-22 02:33:07,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:07,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208854960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:07,683 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:07,683 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:07,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855482049] [2021-05-22 02:33:07,684 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:07,684 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:07,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:07,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:07,684 INFO L87 Difference]: Start difference. First operand 467 states and 1459 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:07,840 INFO L93 Difference]: Finished difference Result 599 states and 1848 transitions. [2021-05-22 02:33:07,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:07,840 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:07,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:07,841 INFO L225 Difference]: With dead ends: 599 [2021-05-22 02:33:07,841 INFO L226 Difference]: Without dead ends: 570 [2021-05-22 02:33:07,841 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 158.8ms TimeCoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:07,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-05-22 02:33:07,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 467. [2021-05-22 02:33:07,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.130901287553648) internal successors, (1459), 466 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1459 transitions. [2021-05-22 02:33:07,846 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1459 transitions. Word has length 21 [2021-05-22 02:33:07,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:07,846 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1459 transitions. [2021-05-22 02:33:07,846 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:07,846 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1459 transitions. [2021-05-22 02:33:07,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:07,847 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:07,847 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:08,047 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 962 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5578 [2021-05-22 02:33:08,047 INFO L430 AbstractCegarLoop]: === Iteration 974 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:08,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:08,048 INFO L82 PathProgramCache]: Analyzing trace with hash -244572257, now seen corresponding path program 962 times [2021-05-22 02:33:08,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:08,048 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [495200314] [2021-05-22 02:33:08,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:08,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:08,139 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:08,139 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:08,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [495200314] [2021-05-22 02:33:08,139 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [495200314] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:08,139 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [414462225] [2021-05-22 02:33:08,139 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 963 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 963 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:08,165 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:08,165 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:08,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:08,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:08,233 INFO L446 ElimStorePlain]: Different costs {0=[o_0], 1=[v_prenex_275]} [2021-05-22 02:33:08,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:08,237 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,250 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,252 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:08,253 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,265 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,266 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:08,266 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:33:08,310 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:08,311 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,313 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:08,313 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,329 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,331 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:08,332 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,346 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,347 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:08,348 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:64, output treesize:19 [2021-05-22 02:33:08,370 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:08,370 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [414462225] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:08,370 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:08,370 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:08,370 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335623118] [2021-05-22 02:33:08,371 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:08,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:08,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:08,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:08,371 INFO L87 Difference]: Start difference. First operand 467 states and 1459 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:08,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:08,524 INFO L93 Difference]: Finished difference Result 658 states and 2010 transitions. [2021-05-22 02:33:08,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:08,524 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:08,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:08,525 INFO L225 Difference]: With dead ends: 658 [2021-05-22 02:33:08,525 INFO L226 Difference]: Without dead ends: 635 [2021-05-22 02:33:08,525 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 159.7ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:08,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 635 states. [2021-05-22 02:33:08,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 635 to 471. [2021-05-22 02:33:08,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.148936170212766) internal successors, (1480), 470 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:08,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1480 transitions. [2021-05-22 02:33:08,530 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1480 transitions. Word has length 21 [2021-05-22 02:33:08,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:08,531 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1480 transitions. [2021-05-22 02:33:08,531 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:08,531 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1480 transitions. [2021-05-22 02:33:08,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:08,531 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:08,531 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:08,731 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 963 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5584 [2021-05-22 02:33:08,732 INFO L430 AbstractCegarLoop]: === Iteration 975 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:08,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:08,732 INFO L82 PathProgramCache]: Analyzing trace with hash -528834941, now seen corresponding path program 963 times [2021-05-22 02:33:08,732 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:08,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1207790881] [2021-05-22 02:33:08,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:08,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:08,827 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:08,827 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:08,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1207790881] [2021-05-22 02:33:08,827 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1207790881] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:08,827 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [418798211] [2021-05-22 02:33:08,827 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 964 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 964 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:08,853 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:08,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:08,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:08,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:08,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:08,902 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,910 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,911 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:08,912 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:41, output treesize:34 [2021-05-22 02:33:08,971 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:08,973 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,975 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:08,976 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:08,994 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:08,996 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:08,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:08,997 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,013 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:09,014 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:09,014 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:19 [2021-05-22 02:33:09,089 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:09,090 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [418798211] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:09,090 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:09,090 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:09,090 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022086305] [2021-05-22 02:33:09,090 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:09,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:09,090 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:09,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:09,090 INFO L87 Difference]: Start difference. First operand 471 states and 1480 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:09,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:09,356 INFO L93 Difference]: Finished difference Result 648 states and 1995 transitions. [2021-05-22 02:33:09,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:33:09,356 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:09,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:09,357 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:33:09,357 INFO L226 Difference]: Without dead ends: 621 [2021-05-22 02:33:09,357 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 260.2ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:09,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 621 states. [2021-05-22 02:33:09,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 621 to 469. [2021-05-22 02:33:09,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.138888888888889) internal successors, (1469), 468 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:09,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1469 transitions. [2021-05-22 02:33:09,362 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1469 transitions. Word has length 21 [2021-05-22 02:33:09,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:09,362 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1469 transitions. [2021-05-22 02:33:09,362 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:09,362 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1469 transitions. [2021-05-22 02:33:09,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:09,363 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:09,363 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:09,563 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 964 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5592 [2021-05-22 02:33:09,563 INFO L430 AbstractCegarLoop]: === Iteration 976 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:09,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:09,564 INFO L82 PathProgramCache]: Analyzing trace with hash -1952945265, now seen corresponding path program 964 times [2021-05-22 02:33:09,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:09,564 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918625471] [2021-05-22 02:33:09,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:09,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:09,672 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:09,672 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:09,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918625471] [2021-05-22 02:33:09,672 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918625471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:09,672 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [242827518] [2021-05-22 02:33:09,672 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 965 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 965 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:09,698 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:09,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:09,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:09,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:09,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:09,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:09,756 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,761 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:09,761 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,762 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:33:09,799 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:09,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:09,801 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,806 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:09,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:09,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:09,809 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,813 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:09,814 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:09,814 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:33:09,841 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:09,841 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [242827518] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:09,841 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:09,841 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:09,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [349771870] [2021-05-22 02:33:09,841 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:09,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:09,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:09,841 INFO L87 Difference]: Start difference. First operand 469 states and 1469 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:10,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:10,174 INFO L93 Difference]: Finished difference Result 679 states and 2079 transitions. [2021-05-22 02:33:10,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:10,174 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:10,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:10,175 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:33:10,175 INFO L226 Difference]: Without dead ends: 660 [2021-05-22 02:33:10,175 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 313.0ms TimeCoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:10,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-22 02:33:10,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 473. [2021-05-22 02:33:10,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.13771186440678) internal successors, (1481), 472 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:10,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1481 transitions. [2021-05-22 02:33:10,180 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1481 transitions. Word has length 21 [2021-05-22 02:33:10,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:10,180 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1481 transitions. [2021-05-22 02:33:10,180 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:10,180 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1481 transitions. [2021-05-22 02:33:10,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:10,181 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:10,181 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:10,381 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5604,965 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:10,381 INFO L430 AbstractCegarLoop]: === Iteration 977 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:10,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:10,381 INFO L82 PathProgramCache]: Analyzing trace with hash 308385551, now seen corresponding path program 965 times [2021-05-22 02:33:10,381 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:10,382 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1408567964] [2021-05-22 02:33:10,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:10,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:10,491 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:10,492 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:10,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1408567964] [2021-05-22 02:33:10,492 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1408567964] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:10,492 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1784214301] [2021-05-22 02:33:10,492 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 966 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 966 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:10,517 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:10,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:10,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:10,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:10,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:10,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:10,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:10,609 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:10,610 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:10,610 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:33:10,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:10,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:10,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:10,655 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:10,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:10,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:10,657 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:10,664 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:10,665 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:10,665 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:33:10,707 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:10,707 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1784214301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:10,707 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:10,707 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:10,707 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247693080] [2021-05-22 02:33:10,708 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:10,708 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:10,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:10,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:10,708 INFO L87 Difference]: Start difference. First operand 473 states and 1481 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:11,085 INFO L93 Difference]: Finished difference Result 665 states and 2042 transitions. [2021-05-22 02:33:11,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:11,085 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:11,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:11,086 INFO L225 Difference]: With dead ends: 665 [2021-05-22 02:33:11,086 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:33:11,086 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 367.0ms TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:11,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:33:11,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 460. [2021-05-22 02:33:11,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.122004357298475) internal successors, (1433), 459 states have internal predecessors, (1433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1433 transitions. [2021-05-22 02:33:11,091 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1433 transitions. Word has length 21 [2021-05-22 02:33:11,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:11,091 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1433 transitions. [2021-05-22 02:33:11,091 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,092 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1433 transitions. [2021-05-22 02:33:11,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:11,092 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:11,092 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:11,292 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5606,966 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:11,292 INFO L430 AbstractCegarLoop]: === Iteration 978 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:11,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:11,293 INFO L82 PathProgramCache]: Analyzing trace with hash 926647719, now seen corresponding path program 966 times [2021-05-22 02:33:11,293 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:11,293 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347134319] [2021-05-22 02:33:11,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:11,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:11,391 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:11,391 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:11,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347134319] [2021-05-22 02:33:11,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347134319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:11,391 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2056232912] [2021-05-22 02:33:11,391 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 967 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 967 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:11,416 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:11,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:11,417 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:11,417 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:11,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:11,479 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:11,484 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:11,485 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:11,485 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:33:11,508 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:11,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:11,509 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:11,515 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:11,516 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:11,517 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:11,517 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:11,523 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:11,523 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:11,523 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:11,535 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2056232912] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:11,535 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:11,535 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:11,535 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733948902] [2021-05-22 02:33:11,535 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:11,535 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:11,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:11,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:11,536 INFO L87 Difference]: Start difference. First operand 460 states and 1433 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:11,654 INFO L93 Difference]: Finished difference Result 534 states and 1646 transitions. [2021-05-22 02:33:11,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:11,654 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:11,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:11,655 INFO L225 Difference]: With dead ends: 534 [2021-05-22 02:33:11,655 INFO L226 Difference]: Without dead ends: 515 [2021-05-22 02:33:11,655 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 142.1ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:11,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2021-05-22 02:33:11,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 456. [2021-05-22 02:33:11,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.123076923076923) internal successors, (1421), 455 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1421 transitions. [2021-05-22 02:33:11,659 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1421 transitions. Word has length 21 [2021-05-22 02:33:11,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:11,659 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1421 transitions. [2021-05-22 02:33:11,659 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:11,660 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1421 transitions. [2021-05-22 02:33:11,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:11,660 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:11,660 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:11,860 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 967 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5609 [2021-05-22 02:33:11,861 INFO L430 AbstractCegarLoop]: === Iteration 979 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:11,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:11,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1131563257, now seen corresponding path program 967 times [2021-05-22 02:33:11,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:11,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [40748798] [2021-05-22 02:33:11,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:11,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:11,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:11,951 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:11,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [40748798] [2021-05-22 02:33:11,951 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [40748798] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:11,951 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2059700287] [2021-05-22 02:33:11,951 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 968 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 968 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:11,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:11,982 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:11,983 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:12,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:12,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,050 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,051 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:12,052 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:33, output treesize:25 [2021-05-22 02:33:12,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:12,084 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:12,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:12,086 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,098 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,100 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:12,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:12,101 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,112 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,113 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:12,113 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:15 [2021-05-22 02:33:12,130 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:12,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2059700287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:12,130 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:12,130 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:12,130 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622877198] [2021-05-22 02:33:12,130 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:12,130 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:12,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:12,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:12,131 INFO L87 Difference]: Start difference. First operand 456 states and 1421 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:12,290 INFO L93 Difference]: Finished difference Result 555 states and 1708 transitions. [2021-05-22 02:33:12,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:12,290 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:12,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:12,291 INFO L225 Difference]: With dead ends: 555 [2021-05-22 02:33:12,291 INFO L226 Difference]: Without dead ends: 519 [2021-05-22 02:33:12,291 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 136.3ms TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:12,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-05-22 02:33:12,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 456. [2021-05-22 02:33:12,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.123076923076923) internal successors, (1421), 455 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1421 transitions. [2021-05-22 02:33:12,296 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1421 transitions. Word has length 21 [2021-05-22 02:33:12,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:12,296 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1421 transitions. [2021-05-22 02:33:12,296 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,296 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1421 transitions. [2021-05-22 02:33:12,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:12,297 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:12,297 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:12,497 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5611,968 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:12,497 INFO L430 AbstractCegarLoop]: === Iteration 980 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:12,497 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:12,498 INFO L82 PathProgramCache]: Analyzing trace with hash 2068705121, now seen corresponding path program 968 times [2021-05-22 02:33:12,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:12,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448624923] [2021-05-22 02:33:12,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:12,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:12,587 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:12,588 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:12,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448624923] [2021-05-22 02:33:12,588 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [448624923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:12,588 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139321159] [2021-05-22 02:33:12,588 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 969 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 969 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:12,612 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:12,613 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:12,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:12,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:12,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:12,684 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:12,686 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,698 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,699 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:12,699 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:25 [2021-05-22 02:33:12,729 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_4], 1=[v_prenex_276, v_prenex_277]} [2021-05-22 02:33:12,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:12,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,742 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,742 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:12,744 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:12,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:12,745 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,753 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,755 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:12,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:12,756 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:12,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:12,765 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:12,765 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:43, output treesize:13 [2021-05-22 02:33:12,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:12,794 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139321159] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:12,794 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:12,794 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:12,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813753237] [2021-05-22 02:33:12,794 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:12,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:12,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:12,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:12,794 INFO L87 Difference]: Start difference. First operand 456 states and 1421 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:12,965 INFO L93 Difference]: Finished difference Result 596 states and 1827 transitions. [2021-05-22 02:33:12,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:33:12,965 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:12,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:12,966 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:33:12,966 INFO L226 Difference]: Without dead ends: 569 [2021-05-22 02:33:12,966 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 176.2ms TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:12,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2021-05-22 02:33:12,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 471. [2021-05-22 02:33:12,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1212765957446806) internal successors, (1467), 470 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1467 transitions. [2021-05-22 02:33:12,971 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1467 transitions. Word has length 21 [2021-05-22 02:33:12,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:12,971 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1467 transitions. [2021-05-22 02:33:12,971 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:12,971 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1467 transitions. [2021-05-22 02:33:12,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:12,972 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:12,972 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:13,172 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 969 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5618 [2021-05-22 02:33:13,172 INFO L430 AbstractCegarLoop]: === Iteration 981 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:13,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:13,172 INFO L82 PathProgramCache]: Analyzing trace with hash -345509237, now seen corresponding path program 969 times [2021-05-22 02:33:13,172 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:13,172 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [968994624] [2021-05-22 02:33:13,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:13,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:13,259 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:13,259 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:13,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [968994624] [2021-05-22 02:33:13,259 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [968994624] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:13,259 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [380890287] [2021-05-22 02:33:13,259 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 970 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 970 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:13,284 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:13,284 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:13,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:13,285 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:13,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:13,383 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:13,386 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,397 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:13,398 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:13,398 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:47, output treesize:25 [2021-05-22 02:33:13,441 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:13,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:13,442 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,447 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:13,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:13,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:13,449 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,453 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:13,454 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,454 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:33:13,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:13,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [380890287] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:13,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:13,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:13,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094203078] [2021-05-22 02:33:13,464 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:13,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:13,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:13,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:13,464 INFO L87 Difference]: Start difference. First operand 471 states and 1467 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:13,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:13,595 INFO L93 Difference]: Finished difference Result 546 states and 1674 transitions. [2021-05-22 02:33:13,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:13,595 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:13,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:13,596 INFO L225 Difference]: With dead ends: 546 [2021-05-22 02:33:13,596 INFO L226 Difference]: Without dead ends: 525 [2021-05-22 02:33:13,596 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 149.7ms TimeCoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:13,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 525 states. [2021-05-22 02:33:13,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 525 to 453. [2021-05-22 02:33:13,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1261061946902653) internal successors, (1413), 452 states have internal predecessors, (1413), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:13,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1413 transitions. [2021-05-22 02:33:13,600 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1413 transitions. Word has length 21 [2021-05-22 02:33:13,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:13,600 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1413 transitions. [2021-05-22 02:33:13,601 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:13,601 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1413 transitions. [2021-05-22 02:33:13,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:13,601 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:13,601 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:13,801 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 970 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5630 [2021-05-22 02:33:13,802 INFO L430 AbstractCegarLoop]: === Iteration 982 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:13,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:13,802 INFO L82 PathProgramCache]: Analyzing trace with hash 306783805, now seen corresponding path program 970 times [2021-05-22 02:33:13,802 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:13,802 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242627683] [2021-05-22 02:33:13,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:13,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:13,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:13,889 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:13,889 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242627683] [2021-05-22 02:33:13,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242627683] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:13,890 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1148237267] [2021-05-22 02:33:13,890 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 971 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 971 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:13,914 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:13,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:13,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:13,915 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:13,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:13,956 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,963 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:13,964 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:13,964 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:33:13,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:13,998 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:13,999 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:13,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:14,000 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,015 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,017 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:14,018 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,032 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,033 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:14,033 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:21 [2021-05-22 02:33:14,067 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:14,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1148237267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:14,067 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:14,067 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:14,067 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224286907] [2021-05-22 02:33:14,067 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:14,067 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:14,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:14,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:14,067 INFO L87 Difference]: Start difference. First operand 453 states and 1413 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:14,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:14,213 INFO L93 Difference]: Finished difference Result 570 states and 1748 transitions. [2021-05-22 02:33:14,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:14,214 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:14,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:14,214 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:33:14,214 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:33:14,215 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 134.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:14,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:33:14,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 454. [2021-05-22 02:33:14,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 454 states, 453 states have (on average 3.130242825607064) internal successors, (1418), 453 states have internal predecessors, (1418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:14,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 454 states to 454 states and 1418 transitions. [2021-05-22 02:33:14,219 INFO L78 Accepts]: Start accepts. Automaton has 454 states and 1418 transitions. Word has length 21 [2021-05-22 02:33:14,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:14,219 INFO L482 AbstractCegarLoop]: Abstraction has 454 states and 1418 transitions. [2021-05-22 02:33:14,219 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:14,219 INFO L276 IsEmpty]: Start isEmpty. Operand 454 states and 1418 transitions. [2021-05-22 02:33:14,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:14,220 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:14,220 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:14,420 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 971 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5637 [2021-05-22 02:33:14,420 INFO L430 AbstractCegarLoop]: === Iteration 983 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:14,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:14,420 INFO L82 PathProgramCache]: Analyzing trace with hash 604050215, now seen corresponding path program 971 times [2021-05-22 02:33:14,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:14,421 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671757166] [2021-05-22 02:33:14,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:14,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:14,512 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:14,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:14,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671757166] [2021-05-22 02:33:14,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671757166] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:14,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [558952092] [2021-05-22 02:33:14,513 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 972 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 972 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:14,539 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:14,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:14,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:14,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:14,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:14,588 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:14,591 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,606 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:14,606 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:14,640 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_278, v_prenex_279], 1=[o_0, o_4]} [2021-05-22 02:33:14,643 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:14,644 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:14,648 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,685 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,685 INFO L518 ElimStorePlain]: Eliminatee v_prenex_279 vanished before elimination [2021-05-22 02:33:14,688 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,688 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:14,689 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:14,693 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,726 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,728 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,729 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:14,730 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,732 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:14,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:14,733 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:14,773 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:14,775 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:33:14,775 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:121, output treesize:57 [2021-05-22 02:33:14,888 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:14,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [558952092] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:14,888 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:14,888 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:14,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958863920] [2021-05-22 02:33:14,889 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:14,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:14,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:14,889 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:14,889 INFO L87 Difference]: Start difference. First operand 454 states and 1418 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:15,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:15,233 INFO L93 Difference]: Finished difference Result 655 states and 2000 transitions. [2021-05-22 02:33:15,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:33:15,233 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:15,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:15,234 INFO L225 Difference]: With dead ends: 655 [2021-05-22 02:33:15,234 INFO L226 Difference]: Without dead ends: 632 [2021-05-22 02:33:15,234 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 351.5ms TimeCoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:33:15,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 632 states. [2021-05-22 02:33:15,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 632 to 469. [2021-05-22 02:33:15,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1474358974358974) internal successors, (1473), 468 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:15,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1473 transitions. [2021-05-22 02:33:15,239 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1473 transitions. Word has length 21 [2021-05-22 02:33:15,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:15,239 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1473 transitions. [2021-05-22 02:33:15,239 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:15,239 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1473 transitions. [2021-05-22 02:33:15,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:15,240 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:15,240 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:15,440 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5641,972 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:15,440 INFO L430 AbstractCegarLoop]: === Iteration 984 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:15,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:15,440 INFO L82 PathProgramCache]: Analyzing trace with hash 319787531, now seen corresponding path program 972 times [2021-05-22 02:33:15,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:15,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205165340] [2021-05-22 02:33:15,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:15,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:15,536 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:15,536 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:15,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205165340] [2021-05-22 02:33:15,536 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205165340] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:15,536 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [63231546] [2021-05-22 02:33:15,536 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 973 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 973 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:15,562 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:15,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:15,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:15,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:15,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:15,611 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:15,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:15,613 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:15,628 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:15,629 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:15,629 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:15,661 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_280, v_prenex_281], 1=[o_0, o_4]} [2021-05-22 02:33:15,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:15,664 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:15,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:15,677 INFO L518 ElimStorePlain]: Eliminatee v_prenex_281 vanished before elimination [2021-05-22 02:33:15,679 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:15,679 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:15,680 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:15,690 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:15,692 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:15,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:15,693 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:15,702 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:15,703 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:15,703 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:33:15,777 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:15,777 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [63231546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:15,777 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:15,777 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:15,777 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661188274] [2021-05-22 02:33:15,778 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:15,778 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:15,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:15,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:15,778 INFO L87 Difference]: Start difference. First operand 469 states and 1473 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:16,105 INFO L93 Difference]: Finished difference Result 717 states and 2186 transitions. [2021-05-22 02:33:16,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:16,105 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:16,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:16,106 INFO L225 Difference]: With dead ends: 717 [2021-05-22 02:33:16,106 INFO L226 Difference]: Without dead ends: 690 [2021-05-22 02:33:16,106 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 279.3ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:16,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-05-22 02:33:16,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 487. [2021-05-22 02:33:16,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.154320987654321) internal successors, (1533), 486 states have internal predecessors, (1533), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1533 transitions. [2021-05-22 02:33:16,112 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1533 transitions. Word has length 21 [2021-05-22 02:33:16,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:16,112 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1533 transitions. [2021-05-22 02:33:16,112 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,112 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1533 transitions. [2021-05-22 02:33:16,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:16,112 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:16,112 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:16,313 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 973 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5651 [2021-05-22 02:33:16,313 INFO L430 AbstractCegarLoop]: === Iteration 985 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:16,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:16,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1640959435, now seen corresponding path program 973 times [2021-05-22 02:33:16,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:16,313 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2143220923] [2021-05-22 02:33:16,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:16,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:16,415 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:16,415 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:16,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2143220923] [2021-05-22 02:33:16,415 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2143220923] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:16,415 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [97491563] [2021-05-22 02:33:16,415 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 974 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 974 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:16,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:16,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:16,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:16,488 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:16,489 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:16,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:16,492 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:16,506 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:16,508 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:16,508 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:16,554 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:16,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:16,555 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:16,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:16,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:16,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:16,563 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:16,569 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:16,569 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:16,569 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:16,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:16,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [97491563] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:16,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:16,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:16,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411881062] [2021-05-22 02:33:16,614 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:16,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:16,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:16,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:16,614 INFO L87 Difference]: Start difference. First operand 487 states and 1533 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:16,910 INFO L93 Difference]: Finished difference Result 671 states and 2064 transitions. [2021-05-22 02:33:16,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:33:16,910 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:16,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:16,911 INFO L225 Difference]: With dead ends: 671 [2021-05-22 02:33:16,911 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:33:16,911 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 262.0ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:16,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:33:16,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 473. [2021-05-22 02:33:16,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1440677966101696) internal successors, (1484), 472 states have internal predecessors, (1484), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1484 transitions. [2021-05-22 02:33:16,917 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1484 transitions. Word has length 21 [2021-05-22 02:33:16,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:16,917 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1484 transitions. [2021-05-22 02:33:16,917 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:16,917 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1484 transitions. [2021-05-22 02:33:16,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:16,917 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:16,917 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:17,117 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 974 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5663 [2021-05-22 02:33:17,118 INFO L430 AbstractCegarLoop]: === Iteration 986 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:17,118 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:17,118 INFO L82 PathProgramCache]: Analyzing trace with hash -1095586781, now seen corresponding path program 974 times [2021-05-22 02:33:17,118 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:17,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1496664200] [2021-05-22 02:33:17,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:17,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:17,229 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:17,229 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:17,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1496664200] [2021-05-22 02:33:17,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1496664200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:17,229 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371722535] [2021-05-22 02:33:17,229 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 975 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 975 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:17,256 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:17,256 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:17,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:17,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:17,305 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:17,306 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:17,308 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,323 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:17,324 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:17,324 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:17,413 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:17,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:17,414 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,419 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:17,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:17,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:17,421 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,425 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:17,426 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,426 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:33:17,436 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:17,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1371722535] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:17,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:17,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:17,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1035146208] [2021-05-22 02:33:17,436 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:17,436 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:17,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:17,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:17,436 INFO L87 Difference]: Start difference. First operand 473 states and 1484 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:17,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:17,617 INFO L93 Difference]: Finished difference Result 577 states and 1763 transitions. [2021-05-22 02:33:17,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:17,618 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:17,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:17,619 INFO L225 Difference]: With dead ends: 577 [2021-05-22 02:33:17,619 INFO L226 Difference]: Without dead ends: 556 [2021-05-22 02:33:17,619 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 198.6ms TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:17,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2021-05-22 02:33:17,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 469. [2021-05-22 02:33:17,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1452991452991452) internal successors, (1472), 468 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:17,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1472 transitions. [2021-05-22 02:33:17,624 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1472 transitions. Word has length 21 [2021-05-22 02:33:17,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:17,624 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1472 transitions. [2021-05-22 02:33:17,624 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:17,624 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1472 transitions. [2021-05-22 02:33:17,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:17,624 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:17,624 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:17,824 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5667,975 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:17,825 INFO L430 AbstractCegarLoop]: === Iteration 987 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:17,825 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:17,825 INFO L82 PathProgramCache]: Analyzing trace with hash 1480395833, now seen corresponding path program 975 times [2021-05-22 02:33:17,825 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:17,825 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865076521] [2021-05-22 02:33:17,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:17,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:17,922 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:17,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:17,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865076521] [2021-05-22 02:33:17,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865076521] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:17,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1689811705] [2021-05-22 02:33:17,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 976 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 976 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:17,948 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:17,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:17,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:17,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:17,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:17,997 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:17,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:17,999 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,013 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,015 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:18,015 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:18,061 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:18,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:18,063 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,068 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,070 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:18,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:18,071 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,076 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,077 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,077 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:18,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:18,121 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1689811705] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:18,121 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:18,121 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:18,121 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1841823260] [2021-05-22 02:33:18,121 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:18,121 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:18,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:18,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:18,122 INFO L87 Difference]: Start difference. First operand 469 states and 1472 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:18,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:18,365 INFO L93 Difference]: Finished difference Result 626 states and 1921 transitions. [2021-05-22 02:33:18,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:33:18,366 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:18,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:18,366 INFO L225 Difference]: With dead ends: 626 [2021-05-22 02:33:18,367 INFO L226 Difference]: Without dead ends: 605 [2021-05-22 02:33:18,367 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 206.5ms TimeCoverageRelationStatistics Valid=72, Invalid=308, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:33:18,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2021-05-22 02:33:18,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 452. [2021-05-22 02:33:18,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.1241685144124167) internal successors, (1409), 451 states have internal predecessors, (1409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:18,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1409 transitions. [2021-05-22 02:33:18,371 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1409 transitions. Word has length 21 [2021-05-22 02:33:18,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:18,371 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1409 transitions. [2021-05-22 02:33:18,372 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:18,372 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1409 transitions. [2021-05-22 02:33:18,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:18,372 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:18,372 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:18,573 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 976 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5679 [2021-05-22 02:33:18,573 INFO L430 AbstractCegarLoop]: === Iteration 988 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:18,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:18,573 INFO L82 PathProgramCache]: Analyzing trace with hash 317055655, now seen corresponding path program 976 times [2021-05-22 02:33:18,573 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:18,573 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151984715] [2021-05-22 02:33:18,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:18,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:18,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:18,690 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:18,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151984715] [2021-05-22 02:33:18,690 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [151984715] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:18,690 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [611674250] [2021-05-22 02:33:18,690 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 977 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 977 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:18,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:18,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:18,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:18,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:18,778 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:18,779 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:18,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:18,780 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,782 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:18,783 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,799 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,799 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:18,800 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:35 [2021-05-22 02:33:18,856 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:18,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:18,859 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,868 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,870 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:18,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:18,871 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,879 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:18,880 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:18,880 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:35, output treesize:12 [2021-05-22 02:33:18,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:18,897 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [611674250] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:18,897 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:18,897 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:18,897 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [569733012] [2021-05-22 02:33:18,897 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:18,897 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:18,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:18,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:18,898 INFO L87 Difference]: Start difference. First operand 452 states and 1409 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:19,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:19,039 INFO L93 Difference]: Finished difference Result 534 states and 1647 transitions. [2021-05-22 02:33:19,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:19,040 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:19,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:19,041 INFO L225 Difference]: With dead ends: 534 [2021-05-22 02:33:19,041 INFO L226 Difference]: Without dead ends: 512 [2021-05-22 02:33:19,041 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 184.0ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:19,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2021-05-22 02:33:19,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 458. [2021-05-22 02:33:19,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1291028446389495) internal successors, (1430), 457 states have internal predecessors, (1430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:19,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1430 transitions. [2021-05-22 02:33:19,047 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1430 transitions. Word has length 21 [2021-05-22 02:33:19,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:19,047 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1430 transitions. [2021-05-22 02:33:19,047 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:19,047 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1430 transitions. [2021-05-22 02:33:19,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:19,048 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:19,048 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:19,264 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 977 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5683 [2021-05-22 02:33:19,265 INFO L430 AbstractCegarLoop]: === Iteration 989 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:19,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:19,265 INFO L82 PathProgramCache]: Analyzing trace with hash 942379773, now seen corresponding path program 977 times [2021-05-22 02:33:19,265 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:19,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1202244386] [2021-05-22 02:33:19,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:19,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:19,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:19,368 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:19,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1202244386] [2021-05-22 02:33:19,368 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1202244386] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:19,368 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [953911332] [2021-05-22 02:33:19,368 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 978 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 978 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:19,394 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:19,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:19,395 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:19,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:19,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,437 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:19,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,440 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:19,441 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,462 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:19,463 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:19,463 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:77, output treesize:63 [2021-05-22 02:33:19,554 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:19,556 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:19,557 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:19,560 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:33:19,564 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:33:19,567 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,608 INFO L628 ElimStorePlain]: treesize reduction 16, result has 81.8 percent of original size [2021-05-22 02:33:19,611 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,611 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:19,612 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,614 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:19,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:33:19,615 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:19,633 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:19,634 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:33:19,634 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 3 variables, input treesize:133, output treesize:26 [2021-05-22 02:33:19,705 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:19,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [953911332] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:19,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:19,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:19,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294096191] [2021-05-22 02:33:19,706 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:19,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:19,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:19,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=255, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:19,706 INFO L87 Difference]: Start difference. First operand 458 states and 1430 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:20,122 INFO L93 Difference]: Finished difference Result 635 states and 1962 transitions. [2021-05-22 02:33:20,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:33:20,122 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:20,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:20,123 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:33:20,123 INFO L226 Difference]: Without dead ends: 608 [2021-05-22 02:33:20,123 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 351.2ms TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:20,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 608 states. [2021-05-22 02:33:20,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 608 to 458. [2021-05-22 02:33:20,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.12472647702407) internal successors, (1428), 457 states have internal predecessors, (1428), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1428 transitions. [2021-05-22 02:33:20,128 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1428 transitions. Word has length 21 [2021-05-22 02:33:20,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:20,128 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1428 transitions. [2021-05-22 02:33:20,128 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,128 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1428 transitions. [2021-05-22 02:33:20,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:20,129 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:20,129 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:20,329 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5686,978 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:20,329 INFO L430 AbstractCegarLoop]: === Iteration 990 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:20,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:20,329 INFO L82 PathProgramCache]: Analyzing trace with hash 658117089, now seen corresponding path program 978 times [2021-05-22 02:33:20,329 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:20,329 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1799386409] [2021-05-22 02:33:20,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:20,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:20,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:20,432 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:20,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1799386409] [2021-05-22 02:33:20,432 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1799386409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:20,432 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [501275143] [2021-05-22 02:33:20,433 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 979 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 979 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:20,459 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:20,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:20,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:20,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:20,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:20,503 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:20,505 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:20,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:20,506 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:20,523 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:20,524 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:20,524 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:33:20,578 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:20,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:20,581 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:20,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:20,583 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:20,595 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:20,597 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:20,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:20,597 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:20,608 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:20,609 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:20,609 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:33:20,658 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:20,658 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [501275143] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:20,658 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:20,659 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:20,659 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536714377] [2021-05-22 02:33:20,659 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:20,659 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:20,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:20,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:20,659 INFO L87 Difference]: Start difference. First operand 458 states and 1428 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:20,960 INFO L93 Difference]: Finished difference Result 729 states and 2226 transitions. [2021-05-22 02:33:20,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:20,960 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:20,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:20,961 INFO L225 Difference]: With dead ends: 729 [2021-05-22 02:33:20,961 INFO L226 Difference]: Without dead ends: 702 [2021-05-22 02:33:20,961 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 294.2ms TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:20,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-05-22 02:33:20,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 472. [2021-05-22 02:33:20,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1231422505307855) internal successors, (1471), 471 states have internal predecessors, (1471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1471 transitions. [2021-05-22 02:33:20,967 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1471 transitions. Word has length 21 [2021-05-22 02:33:20,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:20,967 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1471 transitions. [2021-05-22 02:33:20,967 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:20,967 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1471 transitions. [2021-05-22 02:33:20,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:20,967 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:20,967 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:21,168 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5704,979 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:21,168 INFO L430 AbstractCegarLoop]: === Iteration 991 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:21,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:21,168 INFO L82 PathProgramCache]: Analyzing trace with hash -1950458367, now seen corresponding path program 979 times [2021-05-22 02:33:21,168 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:21,168 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848372593] [2021-05-22 02:33:21,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:21,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:21,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:21,268 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:21,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848372593] [2021-05-22 02:33:21,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848372593] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:21,268 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1547540414] [2021-05-22 02:33:21,268 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 980 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 980 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:21,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:21,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:21,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:21,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:21,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:21,337 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:21,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:21,338 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:21,349 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:21,349 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:21,350 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:33:21,413 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:21,414 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:21,415 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:21,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:21,421 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:21,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:21,422 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:21,426 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:21,427 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:21,427 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:33:21,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:21,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1547540414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:21,456 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:21,456 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:21,456 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068266917] [2021-05-22 02:33:21,456 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:21,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:21,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:21,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:21,456 INFO L87 Difference]: Start difference. First operand 472 states and 1471 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:21,719 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:21,719 INFO L93 Difference]: Finished difference Result 667 states and 2043 transitions. [2021-05-22 02:33:21,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:21,719 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:21,719 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:21,720 INFO L225 Difference]: With dead ends: 667 [2021-05-22 02:33:21,720 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:33:21,720 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 291.9ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:21,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:33:21,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 473. [2021-05-22 02:33:21,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1313559322033897) internal successors, (1478), 472 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:21,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1478 transitions. [2021-05-22 02:33:21,725 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1478 transitions. Word has length 21 [2021-05-22 02:33:21,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:21,725 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1478 transitions. [2021-05-22 02:33:21,725 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:21,725 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1478 transitions. [2021-05-22 02:33:21,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:21,726 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:21,726 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:21,926 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5715,980 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:21,927 INFO L430 AbstractCegarLoop]: === Iteration 992 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:21,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:21,927 INFO L82 PathProgramCache]: Analyzing trace with hash -1927953995, now seen corresponding path program 980 times [2021-05-22 02:33:21,927 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:21,927 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453321244] [2021-05-22 02:33:21,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:21,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:22,020 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:22,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:22,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453321244] [2021-05-22 02:33:22,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453321244] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:22,021 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890232508] [2021-05-22 02:33:22,021 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 981 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 981 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:22,046 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:22,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:22,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:22,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:22,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:22,106 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,108 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:22,109 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,127 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,129 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:22,129 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:67, output treesize:46 [2021-05-22 02:33:22,182 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,182 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:22,183 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,186 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:22,187 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,203 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,205 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:22,206 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,221 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,222 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:22,222 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:69, output treesize:24 [2021-05-22 02:33:22,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:22,263 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890232508] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:22,263 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:22,263 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:22,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1687459845] [2021-05-22 02:33:22,263 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:22,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:22,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:22,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:22,263 INFO L87 Difference]: Start difference. First operand 473 states and 1478 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:22,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:22,435 INFO L93 Difference]: Finished difference Result 596 states and 1842 transitions. [2021-05-22 02:33:22,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:22,436 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:22,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:22,437 INFO L225 Difference]: With dead ends: 596 [2021-05-22 02:33:22,437 INFO L226 Difference]: Without dead ends: 567 [2021-05-22 02:33:22,437 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 166.6ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:22,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 567 states. [2021-05-22 02:33:22,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 567 to 473. [2021-05-22 02:33:22,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1313559322033897) internal successors, (1478), 472 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:22,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1478 transitions. [2021-05-22 02:33:22,441 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1478 transitions. Word has length 21 [2021-05-22 02:33:22,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:22,442 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1478 transitions. [2021-05-22 02:33:22,442 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:22,442 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1478 transitions. [2021-05-22 02:33:22,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:22,442 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:22,442 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:22,642 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5721,981 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:22,643 INFO L430 AbstractCegarLoop]: === Iteration 993 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:22,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:22,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1630687585, now seen corresponding path program 981 times [2021-05-22 02:33:22,643 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:22,643 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1660739622] [2021-05-22 02:33:22,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:22,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:22,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:22,743 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:22,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1660739622] [2021-05-22 02:33:22,743 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1660739622] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:22,743 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534078933] [2021-05-22 02:33:22,744 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 982 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 982 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:22,769 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:22,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:22,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:22,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:22,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:22,809 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,815 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,815 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,815 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:33, output treesize:26 [2021-05-22 02:33:22,841 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:22,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:22,845 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:22,847 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,862 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,864 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:22,864 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:22,865 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:22,878 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:22,879 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:22,879 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:61, output treesize:19 [2021-05-22 02:33:22,950 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:22,950 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534078933] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:22,950 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:22,950 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:22,950 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785961591] [2021-05-22 02:33:22,950 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:22,950 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:22,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:22,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:22,950 INFO L87 Difference]: Start difference. First operand 473 states and 1478 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:23,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:23,337 INFO L93 Difference]: Finished difference Result 648 states and 1993 transitions. [2021-05-22 02:33:23,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:23,337 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:23,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:23,338 INFO L225 Difference]: With dead ends: 648 [2021-05-22 02:33:23,338 INFO L226 Difference]: Without dead ends: 625 [2021-05-22 02:33:23,338 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 338.1ms TimeCoverageRelationStatistics Valid=109, Invalid=443, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:23,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 625 states. [2021-05-22 02:33:23,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 625 to 472. [2021-05-22 02:33:23,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.140127388535032) internal successors, (1479), 471 states have internal predecessors, (1479), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:23,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1479 transitions. [2021-05-22 02:33:23,343 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1479 transitions. Word has length 21 [2021-05-22 02:33:23,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:23,343 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1479 transitions. [2021-05-22 02:33:23,343 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:23,343 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1479 transitions. [2021-05-22 02:33:23,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:23,344 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:23,344 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:23,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5728,982 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:23,544 INFO L430 AbstractCegarLoop]: === Iteration 994 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:23,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:23,545 INFO L82 PathProgramCache]: Analyzing trace with hash -1914950269, now seen corresponding path program 982 times [2021-05-22 02:33:23,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:23,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1315708439] [2021-05-22 02:33:23,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:23,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:23,652 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:23,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:23,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1315708439] [2021-05-22 02:33:23,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1315708439] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:23,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [814973049] [2021-05-22 02:33:23,652 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 983 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 983 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:23,677 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:23,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:23,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:23,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:23,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:23,722 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:23,724 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:23,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:23,725 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:23,736 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:23,737 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:23,737 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:33:23,766 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:23,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:23,770 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:23,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:23,772 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:23,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:23,789 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:23,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:23,790 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:23,804 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:23,805 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:23,805 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:59, output treesize:19 [2021-05-22 02:33:23,879 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:23,879 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [814973049] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:23,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:23,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:23,880 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514612306] [2021-05-22 02:33:23,880 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:23,880 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:23,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:23,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:23,880 INFO L87 Difference]: Start difference. First operand 472 states and 1479 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:24,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:24,254 INFO L93 Difference]: Finished difference Result 753 states and 2288 transitions. [2021-05-22 02:33:24,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:24,254 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:24,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:24,255 INFO L225 Difference]: With dead ends: 753 [2021-05-22 02:33:24,255 INFO L226 Difference]: Without dead ends: 726 [2021-05-22 02:33:24,255 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 319.9ms TimeCoverageRelationStatistics Valid=107, Invalid=445, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:24,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 726 states. [2021-05-22 02:33:24,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 726 to 475. [2021-05-22 02:33:24,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.149789029535865) internal successors, (1493), 474 states have internal predecessors, (1493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:24,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1493 transitions. [2021-05-22 02:33:24,261 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1493 transitions. Word has length 21 [2021-05-22 02:33:24,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:24,261 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1493 transitions. [2021-05-22 02:33:24,261 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:24,261 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1493 transitions. [2021-05-22 02:33:24,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:24,261 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:24,261 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:24,462 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 983 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5735 [2021-05-22 02:33:24,462 INFO L430 AbstractCegarLoop]: === Iteration 995 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:24,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:24,462 INFO L82 PathProgramCache]: Analyzing trace with hash 160739521, now seen corresponding path program 983 times [2021-05-22 02:33:24,462 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:24,462 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [615249377] [2021-05-22 02:33:24,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:24,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:24,571 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:24,571 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:24,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [615249377] [2021-05-22 02:33:24,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [615249377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:24,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918608857] [2021-05-22 02:33:24,571 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 984 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 984 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:24,601 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:24,601 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:24,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:24,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:24,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,647 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:24,654 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:24,658 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,660 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,661 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:24,662 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:24,674 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,705 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:24,706 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:33:24,706 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:113, output treesize:81 [2021-05-22 02:33:24,792 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_0]} [2021-05-22 02:33:24,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:24,796 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:24,799 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,822 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:24,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:24,825 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,827 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:24,827 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:24,828 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:24,848 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:24,849 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:24,849 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:77, output treesize:31 [2021-05-22 02:33:24,923 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:24,924 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918608857] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:24,924 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:24,924 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:24,924 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287411561] [2021-05-22 02:33:24,924 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:24,924 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:24,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:24,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:24,924 INFO L87 Difference]: Start difference. First operand 475 states and 1493 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:25,262 INFO L93 Difference]: Finished difference Result 703 states and 2170 transitions. [2021-05-22 02:33:25,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:33:25,262 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:25,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:25,263 INFO L225 Difference]: With dead ends: 703 [2021-05-22 02:33:25,263 INFO L226 Difference]: Without dead ends: 682 [2021-05-22 02:33:25,263 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 368.7ms TimeCoverageRelationStatistics Valid=94, Invalid=412, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:25,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 682 states. [2021-05-22 02:33:25,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 682 to 471. [2021-05-22 02:33:25,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1404255319148935) internal successors, (1476), 470 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1476 transitions. [2021-05-22 02:33:25,268 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1476 transitions. Word has length 21 [2021-05-22 02:33:25,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:25,268 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1476 transitions. [2021-05-22 02:33:25,268 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,268 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1476 transitions. [2021-05-22 02:33:25,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:25,269 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:25,269 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:25,469 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5746,984 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:25,469 INFO L430 AbstractCegarLoop]: === Iteration 996 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:25,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:25,470 INFO L82 PathProgramCache]: Analyzing trace with hash -230709051, now seen corresponding path program 984 times [2021-05-22 02:33:25,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:25,470 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733922103] [2021-05-22 02:33:25,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:25,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:25,556 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:25,556 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:25,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733922103] [2021-05-22 02:33:25,556 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733922103] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:25,556 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962400642] [2021-05-22 02:33:25,556 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 985 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 985 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:25,581 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:33:25,581 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:25,582 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:25,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:25,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:25,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:25,629 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:25,630 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:25,630 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:38, output treesize:30 [2021-05-22 02:33:25,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:25,663 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:25,665 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:25,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:25,666 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:25,681 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:25,682 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:25,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 5 [2021-05-22 02:33:25,683 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:25,697 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:25,698 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:25,698 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:63, output treesize:21 [2021-05-22 02:33:25,731 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:25,731 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1962400642] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:25,732 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:25,732 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:25,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232580144] [2021-05-22 02:33:25,732 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:25,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:25,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:25,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:25,732 INFO L87 Difference]: Start difference. First operand 471 states and 1476 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:25,916 INFO L93 Difference]: Finished difference Result 570 states and 1763 transitions. [2021-05-22 02:33:25,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:25,917 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:25,917 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:25,918 INFO L225 Difference]: With dead ends: 570 [2021-05-22 02:33:25,918 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:33:25,918 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:25,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:33:25,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 472. [2021-05-22 02:33:25,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1443736730360934) internal successors, (1481), 471 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1481 transitions. [2021-05-22 02:33:25,927 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1481 transitions. Word has length 21 [2021-05-22 02:33:25,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:25,927 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1481 transitions. [2021-05-22 02:33:25,927 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:25,927 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1481 transitions. [2021-05-22 02:33:25,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:25,928 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:25,928 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:26,128 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 985 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5754 [2021-05-22 02:33:26,128 INFO L430 AbstractCegarLoop]: === Iteration 997 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:26,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:26,129 INFO L82 PathProgramCache]: Analyzing trace with hash 66557359, now seen corresponding path program 985 times [2021-05-22 02:33:26,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:26,129 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129139750] [2021-05-22 02:33:26,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:26,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:26,226 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:26,226 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:26,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129139750] [2021-05-22 02:33:26,226 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129139750] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:26,226 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895959927] [2021-05-22 02:33:26,227 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 986 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 986 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:26,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:26,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:26,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:26,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:26,301 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:26,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:26,304 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:26,318 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:26,319 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:26,319 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:26,351 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_282, v_prenex_283], 1=[o_0, o_4]} [2021-05-22 02:33:26,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:26,354 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:26,366 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:26,367 INFO L518 ElimStorePlain]: Eliminatee v_prenex_283 vanished before elimination [2021-05-22 02:33:26,369 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:26,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:26,370 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:26,380 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:26,382 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:26,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:26,383 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:26,393 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:26,393 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:26,393 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:33:26,464 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:26,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895959927] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:26,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:26,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:26,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1305808898] [2021-05-22 02:33:26,464 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:26,464 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:26,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:26,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:26,464 INFO L87 Difference]: Start difference. First operand 472 states and 1481 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:26,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:26,817 INFO L93 Difference]: Finished difference Result 683 states and 2098 transitions. [2021-05-22 02:33:26,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:26,817 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:26,817 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:26,818 INFO L225 Difference]: With dead ends: 683 [2021-05-22 02:33:26,818 INFO L226 Difference]: Without dead ends: 660 [2021-05-22 02:33:26,818 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 311.5ms TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:26,819 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 660 states. [2021-05-22 02:33:26,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 660 to 487. [2021-05-22 02:33:26,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 487 states, 486 states have (on average 3.1604938271604937) internal successors, (1536), 486 states have internal predecessors, (1536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:26,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 487 states to 487 states and 1536 transitions. [2021-05-22 02:33:26,824 INFO L78 Accepts]: Start accepts. Automaton has 487 states and 1536 transitions. Word has length 21 [2021-05-22 02:33:26,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:26,824 INFO L482 AbstractCegarLoop]: Abstraction has 487 states and 1536 transitions. [2021-05-22 02:33:26,824 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:26,824 INFO L276 IsEmpty]: Start isEmpty. Operand 487 states and 1536 transitions. [2021-05-22 02:33:26,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:26,824 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:26,824 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:27,025 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5758,986 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:27,025 INFO L430 AbstractCegarLoop]: === Iteration 998 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:27,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:27,025 INFO L82 PathProgramCache]: Analyzing trace with hash -217705325, now seen corresponding path program 986 times [2021-05-22 02:33:27,025 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:27,025 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031237922] [2021-05-22 02:33:27,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:27,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:27,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:27,126 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:27,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031237922] [2021-05-22 02:33:27,126 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031237922] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:27,126 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1542574841] [2021-05-22 02:33:27,126 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 987 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 987 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:27,150 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:27,150 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:27,151 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:27,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:27,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:27,198 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:27,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:27,200 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:27,215 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:27,216 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:27,216 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:27,249 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_284, v_prenex_285], 1=[o_0, o_4]} [2021-05-22 02:33:27,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:27,252 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:27,264 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:27,264 INFO L518 ElimStorePlain]: Eliminatee v_prenex_285 vanished before elimination [2021-05-22 02:33:27,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:27,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:27,267 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:27,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:27,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:27,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:27,281 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:27,291 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:27,292 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:27,292 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:33:27,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:27,374 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1542574841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:27,374 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:27,374 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:27,374 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [696339365] [2021-05-22 02:33:27,374 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:27,374 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:27,374 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:27,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:27,375 INFO L87 Difference]: Start difference. First operand 487 states and 1536 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:27,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:27,677 INFO L93 Difference]: Finished difference Result 692 states and 2134 transitions. [2021-05-22 02:33:27,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:33:27,677 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:27,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:27,678 INFO L225 Difference]: With dead ends: 692 [2021-05-22 02:33:27,678 INFO L226 Difference]: Without dead ends: 665 [2021-05-22 02:33:27,678 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 269.4ms TimeCoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:27,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-05-22 02:33:27,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 493. [2021-05-22 02:33:27,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.158536585365854) internal successors, (1554), 492 states have internal predecessors, (1554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:27,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1554 transitions. [2021-05-22 02:33:27,683 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1554 transitions. Word has length 21 [2021-05-22 02:33:27,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:27,684 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1554 transitions. [2021-05-22 02:33:27,684 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:27,684 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1554 transitions. [2021-05-22 02:33:27,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:27,684 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:27,684 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:27,884 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5767,987 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:27,885 INFO L430 AbstractCegarLoop]: === Iteration 999 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:27,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:27,885 INFO L82 PathProgramCache]: Analyzing trace with hash 2116515005, now seen corresponding path program 987 times [2021-05-22 02:33:27,885 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:27,885 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164322393] [2021-05-22 02:33:27,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:27,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:27,970 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:27,971 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:27,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164322393] [2021-05-22 02:33:27,971 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164322393] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:27,971 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253261484] [2021-05-22 02:33:27,971 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 988 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 988 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:27,996 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:33:27,996 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:27,997 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:27,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:28,044 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:28,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:28,047 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,061 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,063 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:28,063 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:28,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:28,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:28,110 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:28,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:28,118 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,123 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,124 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:28,138 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:28,138 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253261484] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:28,138 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:28,138 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:28,138 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618991592] [2021-05-22 02:33:28,139 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:28,139 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:28,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:28,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:28,139 INFO L87 Difference]: Start difference. First operand 493 states and 1554 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:28,298 INFO L93 Difference]: Finished difference Result 576 states and 1781 transitions. [2021-05-22 02:33:28,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:28,298 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:28,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:28,299 INFO L225 Difference]: With dead ends: 576 [2021-05-22 02:33:28,299 INFO L226 Difference]: Without dead ends: 557 [2021-05-22 02:33:28,299 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 135.9ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:28,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 557 states. [2021-05-22 02:33:28,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 557 to 477. [2021-05-22 02:33:28,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1512605042016806) internal successors, (1500), 476 states have internal predecessors, (1500), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1500 transitions. [2021-05-22 02:33:28,304 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1500 transitions. Word has length 21 [2021-05-22 02:33:28,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:28,304 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1500 transitions. [2021-05-22 02:33:28,305 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,305 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1500 transitions. [2021-05-22 02:33:28,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:28,305 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:28,305 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:28,505 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5779,988 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:28,506 INFO L430 AbstractCegarLoop]: === Iteration 1000 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:28,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:28,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1633079637, now seen corresponding path program 988 times [2021-05-22 02:33:28,506 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:28,506 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213628152] [2021-05-22 02:33:28,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:28,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:28,599 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:28,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:28,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213628152] [2021-05-22 02:33:28,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213628152] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:28,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478266409] [2021-05-22 02:33:28,600 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 989 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 989 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:28,625 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:28,625 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:28,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:28,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:28,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:28,674 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:28,676 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,691 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,693 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:28,693 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:28,782 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:28,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:28,783 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,788 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,789 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:28,790 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:28,790 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,794 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:28,795 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:28,795 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:28, output treesize:7 [2021-05-22 02:33:28,804 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:28,805 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478266409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:28,805 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:28,805 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:28,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453177345] [2021-05-22 02:33:28,805 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:28,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:28,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:28,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=196, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:28,805 INFO L87 Difference]: Start difference. First operand 477 states and 1500 transitions. Second operand has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:28,946 INFO L93 Difference]: Finished difference Result 585 states and 1800 transitions. [2021-05-22 02:33:28,946 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:28,946 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:28,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:28,947 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:33:28,947 INFO L226 Difference]: Without dead ends: 564 [2021-05-22 02:33:28,947 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 179.2ms TimeCoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:28,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2021-05-22 02:33:28,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 477. [2021-05-22 02:33:28,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.1596638655462184) internal successors, (1504), 476 states have internal predecessors, (1504), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1504 transitions. [2021-05-22 02:33:28,952 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1504 transitions. Word has length 21 [2021-05-22 02:33:28,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:28,952 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1504 transitions. [2021-05-22 02:33:28,952 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.8125) internal successors, (29), 16 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:28,952 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1504 transitions. [2021-05-22 02:33:28,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:28,952 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:28,952 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:29,153 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 989 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5783 [2021-05-22 02:33:29,153 INFO L430 AbstractCegarLoop]: === Iteration 1001 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:29,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:29,153 INFO L82 PathProgramCache]: Analyzing trace with hash 942902977, now seen corresponding path program 989 times [2021-05-22 02:33:29,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:29,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367704503] [2021-05-22 02:33:29,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:29,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:29,250 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:29,250 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:29,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367704503] [2021-05-22 02:33:29,250 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [367704503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:29,250 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812776471] [2021-05-22 02:33:29,250 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 990 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 990 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:29,275 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:33:29,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:29,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:29,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:29,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:29,324 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,325 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:29,326 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,340 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:29,341 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:29,342 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:29,389 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,390 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:29,391 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,393 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:29,394 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:29,418 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,418 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:29,419 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,421 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:29,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:29,421 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:29,442 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:29,442 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:29,443 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:77, output treesize:31 [2021-05-22 02:33:29,518 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:29,518 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812776471] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:29,518 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:29,518 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:29,518 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988918818] [2021-05-22 02:33:29,518 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:29,518 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:29,518 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:29,518 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:29,518 INFO L87 Difference]: Start difference. First operand 477 states and 1504 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:29,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:29,892 INFO L93 Difference]: Finished difference Result 669 states and 2070 transitions. [2021-05-22 02:33:29,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:29,892 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:29,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:29,893 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:33:29,893 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 02:33:29,893 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 293.6ms TimeCoverageRelationStatistics Valid=84, Invalid=378, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:29,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 02:33:29,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 473. [2021-05-22 02:33:29,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1504237288135593) internal successors, (1487), 472 states have internal predecessors, (1487), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:29,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1487 transitions. [2021-05-22 02:33:29,898 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1487 transitions. Word has length 21 [2021-05-22 02:33:29,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:29,898 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1487 transitions. [2021-05-22 02:33:29,898 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1487 transitions. [2021-05-22 02:33:29,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:29,899 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:29,899 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:30,099 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 990 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5790 [2021-05-22 02:33:30,099 INFO L430 AbstractCegarLoop]: === Iteration 1002 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:30,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:30,099 INFO L82 PathProgramCache]: Analyzing trace with hash -1955677141, now seen corresponding path program 990 times [2021-05-22 02:33:30,099 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:30,100 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893399174] [2021-05-22 02:33:30,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:30,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:30,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:30,196 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:30,196 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893399174] [2021-05-22 02:33:30,197 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1893399174] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:30,197 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510122089] [2021-05-22 02:33:30,197 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 991 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 991 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:30,222 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:30,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:30,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:30,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:30,314 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:30,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:30,315 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:30,322 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:30,323 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:30,323 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:33:30,372 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:30,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:30,373 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:30,380 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:30,382 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:30,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:30,383 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:30,389 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:30,390 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:30,390 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:7 [2021-05-22 02:33:30,420 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:30,420 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1510122089] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:30,420 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:30,420 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:30,420 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815706200] [2021-05-22 02:33:30,421 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:30,421 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:30,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:30,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:30,421 INFO L87 Difference]: Start difference. First operand 473 states and 1487 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:30,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:30,771 INFO L93 Difference]: Finished difference Result 675 states and 2073 transitions. [2021-05-22 02:33:30,771 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:30,771 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:30,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:30,772 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:33:30,772 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:33:30,773 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 318.4ms TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:30,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:33:30,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 475. [2021-05-22 02:33:30,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.147679324894515) internal successors, (1492), 474 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:30,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1492 transitions. [2021-05-22 02:33:30,778 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1492 transitions. Word has length 21 [2021-05-22 02:33:30,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:30,778 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1492 transitions. [2021-05-22 02:33:30,778 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:30,778 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1492 transitions. [2021-05-22 02:33:30,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:30,778 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:30,778 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:30,979 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5797,991 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:30,979 INFO L430 AbstractCegarLoop]: === Iteration 1003 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:30,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:30,979 INFO L82 PathProgramCache]: Analyzing trace with hash 1009361993, now seen corresponding path program 991 times [2021-05-22 02:33:30,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:30,979 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186958296] [2021-05-22 02:33:30,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:30,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:31,067 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:31,067 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:31,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186958296] [2021-05-22 02:33:31,067 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186958296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:31,067 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1992978329] [2021-05-22 02:33:31,067 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 992 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 992 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:31,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:31,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:31,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:31,176 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:31,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:31,177 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,184 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,185 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:31,185 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:33:31,209 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:31,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:31,211 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,221 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:31,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:31,222 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,230 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,230 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,231 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:33:31,251 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:31,251 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1992978329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:31,251 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:31,251 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:31,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882793965] [2021-05-22 02:33:31,251 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:31,251 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:31,251 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:31,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:31,251 INFO L87 Difference]: Start difference. First operand 475 states and 1492 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:31,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:31,377 INFO L93 Difference]: Finished difference Result 566 states and 1749 transitions. [2021-05-22 02:33:31,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:31,378 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:31,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:31,378 INFO L225 Difference]: With dead ends: 566 [2021-05-22 02:33:31,378 INFO L226 Difference]: Without dead ends: 545 [2021-05-22 02:33:31,378 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 153.1ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:31,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 545 states. [2021-05-22 02:33:31,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 545 to 472. [2021-05-22 02:33:31,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.142250530785563) internal successors, (1480), 471 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:31,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1480 transitions. [2021-05-22 02:33:31,383 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1480 transitions. Word has length 21 [2021-05-22 02:33:31,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:31,383 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1480 transitions. [2021-05-22 02:33:31,383 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:31,383 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1480 transitions. [2021-05-22 02:33:31,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:31,384 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:31,384 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:31,584 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5800,992 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:31,584 INFO L430 AbstractCegarLoop]: === Iteration 1004 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:31,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:31,584 INFO L82 PathProgramCache]: Analyzing trace with hash 94280505, now seen corresponding path program 992 times [2021-05-22 02:33:31,584 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:31,584 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1780603621] [2021-05-22 02:33:31,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:31,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:31,682 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:31,682 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:31,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1780603621] [2021-05-22 02:33:31,682 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1780603621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:31,682 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [194061401] [2021-05-22 02:33:31,682 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 993 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 993 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:31,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:31,708 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:31,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:31,708 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:31,771 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:31,772 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,778 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:31,779 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:33:31,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:31,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:31,802 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,808 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,810 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:31,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:31,810 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,816 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:31,816 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:31,817 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:31,861 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:31,861 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [194061401] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:31,861 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:31,861 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:31,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806939525] [2021-05-22 02:33:31,861 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:31,861 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:31,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:31,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:31,861 INFO L87 Difference]: Start difference. First operand 472 states and 1480 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:32,133 INFO L93 Difference]: Finished difference Result 635 states and 1947 transitions. [2021-05-22 02:33:32,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:33:32,134 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:32,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:32,135 INFO L225 Difference]: With dead ends: 635 [2021-05-22 02:33:32,135 INFO L226 Difference]: Without dead ends: 614 [2021-05-22 02:33:32,135 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 236.9ms TimeCoverageRelationStatistics Valid=86, Invalid=376, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:32,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2021-05-22 02:33:32,139 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 451. [2021-05-22 02:33:32,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.1244444444444444) internal successors, (1406), 450 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1406 transitions. [2021-05-22 02:33:32,140 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1406 transitions. Word has length 21 [2021-05-22 02:33:32,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:32,140 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1406 transitions. [2021-05-22 02:33:32,140 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,140 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1406 transitions. [2021-05-22 02:33:32,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:32,140 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:32,140 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:32,341 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 993 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5803 [2021-05-22 02:33:32,341 INFO L430 AbstractCegarLoop]: === Iteration 1005 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:32,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:32,341 INFO L82 PathProgramCache]: Analyzing trace with hash -460746955, now seen corresponding path program 993 times [2021-05-22 02:33:32,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:32,341 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [699999570] [2021-05-22 02:33:32,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:32,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:32,411 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:32,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:32,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [699999570] [2021-05-22 02:33:32,411 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [699999570] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:32,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004215216] [2021-05-22 02:33:32,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 994 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 994 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:32,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:32,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:32,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:32,439 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:32,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:32,478 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:32,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:32,481 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:32,489 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:32,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:32,490 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:32,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:32,543 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:32,545 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:32,545 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:32,546 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:32,546 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:9 [2021-05-22 02:33:32,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:32,554 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1004215216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:32,554 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:32,554 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:32,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [365414633] [2021-05-22 02:33:32,554 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:32,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:32,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:32,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:32,555 INFO L87 Difference]: Start difference. First operand 451 states and 1406 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:32,729 INFO L93 Difference]: Finished difference Result 565 states and 1735 transitions. [2021-05-22 02:33:32,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:32,729 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:32,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:32,730 INFO L225 Difference]: With dead ends: 565 [2021-05-22 02:33:32,730 INFO L226 Difference]: Without dead ends: 543 [2021-05-22 02:33:32,730 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 148.2ms TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:32,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-22 02:33:32,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 465. [2021-05-22 02:33:32,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.125) internal successors, (1450), 464 states have internal predecessors, (1450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1450 transitions. [2021-05-22 02:33:32,735 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1450 transitions. Word has length 21 [2021-05-22 02:33:32,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:32,735 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1450 transitions. [2021-05-22 02:33:32,735 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:32,735 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1450 transitions. [2021-05-22 02:33:32,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:32,735 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:32,735 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:32,936 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5805,994 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:32,936 INFO L430 AbstractCegarLoop]: === Iteration 1006 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:32,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:32,936 INFO L82 PathProgramCache]: Analyzing trace with hash -962538291, now seen corresponding path program 994 times [2021-05-22 02:33:32,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:32,936 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [855721941] [2021-05-22 02:33:32,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:32,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:33,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:33,006 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:33,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [855721941] [2021-05-22 02:33:33,006 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [855721941] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:33,006 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [862862349] [2021-05-22 02:33:33,006 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 995 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 995 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:33,031 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:33,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:33,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:33,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:33,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:33,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:33,073 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,082 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:33,082 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:33,082 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:33,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:33,119 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,123 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:33,123 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:33,123 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,123 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:33:33,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:33,136 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [862862349] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:33,136 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:33,136 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:33,136 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932652778] [2021-05-22 02:33:33,136 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:33,136 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:33,136 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:33,136 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:33,136 INFO L87 Difference]: Start difference. First operand 465 states and 1450 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:33,304 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:33,304 INFO L93 Difference]: Finished difference Result 574 states and 1759 transitions. [2021-05-22 02:33:33,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:33,305 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:33,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:33,305 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:33:33,305 INFO L226 Difference]: Without dead ends: 552 [2021-05-22 02:33:33,305 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 137.1ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:33,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2021-05-22 02:33:33,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 462. [2021-05-22 02:33:33,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 462 states, 461 states have (on average 3.119305856832972) internal successors, (1438), 461 states have internal predecessors, (1438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:33,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 462 states to 462 states and 1438 transitions. [2021-05-22 02:33:33,310 INFO L78 Accepts]: Start accepts. Automaton has 462 states and 1438 transitions. Word has length 21 [2021-05-22 02:33:33,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:33,310 INFO L482 AbstractCegarLoop]: Abstraction has 462 states and 1438 transitions. [2021-05-22 02:33:33,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:33,310 INFO L276 IsEmpty]: Start isEmpty. Operand 462 states and 1438 transitions. [2021-05-22 02:33:33,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:33,311 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:33,311 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:33,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 995 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5808 [2021-05-22 02:33:33,511 INFO L430 AbstractCegarLoop]: === Iteration 1007 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:33,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:33,512 INFO L82 PathProgramCache]: Analyzing trace with hash 164577163, now seen corresponding path program 995 times [2021-05-22 02:33:33,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:33,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [921744924] [2021-05-22 02:33:33,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:33,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:33,622 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:33,622 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:33,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [921744924] [2021-05-22 02:33:33,622 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [921744924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:33,622 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624614048] [2021-05-22 02:33:33,622 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 996 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 996 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:33,653 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:33,653 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:33,654 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:33,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:33,757 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_286], 1=[o_0]} [2021-05-22 02:33:33,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:33,762 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:33,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,816 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:33,819 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:33,820 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:33,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:33,821 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:33,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:33,825 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:33,869 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:33,871 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 2 dim-0 vars, and 4 xjuncts. [2021-05-22 02:33:33,872 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:123, output treesize:91 [2021-05-22 02:33:34,146 INFO L446 ElimStorePlain]: Different costs {1=[o_4], 3=[o_2]} [2021-05-22 02:33:34,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:34,150 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:34,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,153 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:33:34,154 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:34,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:34,178 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,179 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 7 [2021-05-22 02:33:34,180 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:34,183 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:34,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:34,184 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:34,206 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:34,207 INFO L550 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:34,207 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 5 variables, input treesize:81, output treesize:21 [2021-05-22 02:33:34,268 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:34,268 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624614048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:34,268 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:34,268 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:34,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390074326] [2021-05-22 02:33:34,269 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:34,269 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:34,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:34,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:34,269 INFO L87 Difference]: Start difference. First operand 462 states and 1438 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:35,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:35,550 INFO L93 Difference]: Finished difference Result 767 states and 2340 transitions. [2021-05-22 02:33:35,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:33:35,550 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:35,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:35,551 INFO L225 Difference]: With dead ends: 767 [2021-05-22 02:33:35,551 INFO L226 Difference]: Without dead ends: 729 [2021-05-22 02:33:35,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 12 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 1232.7ms TimeCoverageRelationStatistics Valid=203, Invalid=727, Unknown=0, NotChecked=0, Total=930 [2021-05-22 02:33:35,552 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 729 states. [2021-05-22 02:33:35,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 729 to 471. [2021-05-22 02:33:35,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1340425531914895) internal successors, (1473), 470 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:35,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1473 transitions. [2021-05-22 02:33:35,557 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1473 transitions. Word has length 21 [2021-05-22 02:33:35,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:35,557 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1473 transitions. [2021-05-22 02:33:35,557 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:35,557 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1473 transitions. [2021-05-22 02:33:35,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:35,557 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:35,557 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:35,758 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5811,996 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:35,758 INFO L430 AbstractCegarLoop]: === Iteration 1008 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:35,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:35,758 INFO L82 PathProgramCache]: Analyzing trace with hash -57631449, now seen corresponding path program 996 times [2021-05-22 02:33:35,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:35,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [293352467] [2021-05-22 02:33:35,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:35,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:35,837 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:35,837 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:35,837 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [293352467] [2021-05-22 02:33:35,838 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [293352467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:35,838 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786928851] [2021-05-22 02:33:35,838 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 997 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 997 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:35,863 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:35,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:35,864 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:35,865 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:35,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:35,895 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:35,900 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:35,900 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:35,900 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:33:35,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:35,953 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:35,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:35,955 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:35,958 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:35,958 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:35,958 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:35,958 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:33, output treesize:5 [2021-05-22 02:33:35,983 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:35,983 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1786928851] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:35,983 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:35,984 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:35,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644875704] [2021-05-22 02:33:35,984 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:35,984 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:35,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:35,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:35,984 INFO L87 Difference]: Start difference. First operand 471 states and 1473 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:36,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:36,321 INFO L93 Difference]: Finished difference Result 776 states and 2361 transitions. [2021-05-22 02:33:36,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:33:36,321 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:36,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:36,322 INFO L225 Difference]: With dead ends: 776 [2021-05-22 02:33:36,322 INFO L226 Difference]: Without dead ends: 716 [2021-05-22 02:33:36,322 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 232.1ms TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:36,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 716 states. [2021-05-22 02:33:36,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 716 to 471. [2021-05-22 02:33:36,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.123404255319149) internal successors, (1468), 470 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:36,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1468 transitions. [2021-05-22 02:33:36,328 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1468 transitions. Word has length 21 [2021-05-22 02:33:36,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:36,328 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1468 transitions. [2021-05-22 02:33:36,328 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:36,328 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1468 transitions. [2021-05-22 02:33:36,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:36,328 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:36,328 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:36,528 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 997 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5828 [2021-05-22 02:33:36,529 INFO L430 AbstractCegarLoop]: === Iteration 1009 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:36,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:36,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1850969003, now seen corresponding path program 997 times [2021-05-22 02:33:36,529 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:36,529 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113117637] [2021-05-22 02:33:36,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:36,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:36,626 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:36,626 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:36,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2113117637] [2021-05-22 02:33:36,626 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2113117637] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:36,626 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812654616] [2021-05-22 02:33:36,626 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 998 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 998 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:36,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:36,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:36,652 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:36,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:36,698 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:36,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:36,699 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:36,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:36,702 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:36,713 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:36,714 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:36,714 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:47, output treesize:31 [2021-05-22 02:33:36,769 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:36,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:36,772 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:36,774 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:36,775 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:36,787 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:36,789 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:36,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:36,789 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:36,800 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:36,801 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:36,801 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 3 variables, input treesize:53, output treesize:13 [2021-05-22 02:33:36,847 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:36,847 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812654616] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:36,847 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:36,847 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:36,847 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [930662132] [2021-05-22 02:33:36,847 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:36,847 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:36,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:36,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=250, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:36,847 INFO L87 Difference]: Start difference. First operand 471 states and 1468 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:37,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:37,327 INFO L93 Difference]: Finished difference Result 823 states and 2500 transitions. [2021-05-22 02:33:37,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:33:37,327 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:37,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:37,329 INFO L225 Difference]: With dead ends: 823 [2021-05-22 02:33:37,329 INFO L226 Difference]: Without dead ends: 800 [2021-05-22 02:33:37,329 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 384.7ms TimeCoverageRelationStatistics Valid=126, Invalid=474, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:33:37,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-05-22 02:33:37,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 475. [2021-05-22 02:33:37,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.1223628691983123) internal successors, (1480), 474 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:37,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1480 transitions. [2021-05-22 02:33:37,337 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1480 transitions. Word has length 21 [2021-05-22 02:33:37,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:37,337 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1480 transitions. [2021-05-22 02:33:37,337 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:37,337 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1480 transitions. [2021-05-22 02:33:37,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:37,337 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:37,337 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:37,538 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5831,998 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:37,538 INFO L430 AbstractCegarLoop]: === Iteration 1010 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:37,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:37,538 INFO L82 PathProgramCache]: Analyzing trace with hash -147159379, now seen corresponding path program 998 times [2021-05-22 02:33:37,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:37,538 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395352364] [2021-05-22 02:33:37,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:37,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:37,634 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:37,634 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:37,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395352364] [2021-05-22 02:33:37,634 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395352364] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:37,634 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681519319] [2021-05-22 02:33:37,634 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 999 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 999 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:37,659 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:37,659 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:37,660 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:37,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:37,746 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_290], 1=[o_0]} [2021-05-22 02:33:37,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:37,750 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:37,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:37,765 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:37,765 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:37,766 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:37,782 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:37,783 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:37,783 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:33:37,859 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:37,859 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:37,860 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:37,867 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:37,869 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:37,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:37,869 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:37,876 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:37,876 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:37,877 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:33:37,919 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:37,919 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1681519319] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:37,919 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:37,919 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:37,919 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916879606] [2021-05-22 02:33:37,919 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:37,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:37,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:37,919 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:37,919 INFO L87 Difference]: Start difference. First operand 475 states and 1480 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:38,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:38,411 INFO L93 Difference]: Finished difference Result 719 states and 2200 transitions. [2021-05-22 02:33:38,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:38,412 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:38,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:38,413 INFO L225 Difference]: With dead ends: 719 [2021-05-22 02:33:38,413 INFO L226 Difference]: Without dead ends: 700 [2021-05-22 02:33:38,413 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 456.3ms TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:38,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2021-05-22 02:33:38,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 471. [2021-05-22 02:33:38,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1148936170212767) internal successors, (1464), 470 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:38,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1464 transitions. [2021-05-22 02:33:38,418 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1464 transitions. Word has length 21 [2021-05-22 02:33:38,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:38,418 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1464 transitions. [2021-05-22 02:33:38,418 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:38,418 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1464 transitions. [2021-05-22 02:33:38,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:38,419 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:38,419 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:38,619 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5839,999 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:38,620 INFO L430 AbstractCegarLoop]: === Iteration 1011 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:38,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:38,620 INFO L82 PathProgramCache]: Analyzing trace with hash -1876121267, now seen corresponding path program 999 times [2021-05-22 02:33:38,620 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:38,620 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643977491] [2021-05-22 02:33:38,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:38,696 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:38,696 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:38,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643977491] [2021-05-22 02:33:38,696 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1643977491] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:38,696 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388914982] [2021-05-22 02:33:38,696 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1000 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1000 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:38,722 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:38,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:38,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:38,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:38,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:38,757 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:38,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:38,760 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:38,769 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:38,769 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:38,769 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:38,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:38,819 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:38,826 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:38,828 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:38,829 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:38,835 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:38,835 INFO L518 ElimStorePlain]: Eliminatee v_prenex_292 vanished before elimination [2021-05-22 02:33:38,835 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:38,835 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:38,835 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:15 [2021-05-22 02:33:38,860 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:38,860 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388914982] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:38,860 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:38,860 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:38,860 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897876521] [2021-05-22 02:33:38,860 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:38,860 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:38,860 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:38,860 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:38,860 INFO L87 Difference]: Start difference. First operand 471 states and 1464 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:39,041 INFO L93 Difference]: Finished difference Result 619 states and 1903 transitions. [2021-05-22 02:33:39,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:39,041 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:39,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:39,042 INFO L225 Difference]: With dead ends: 619 [2021-05-22 02:33:39,042 INFO L226 Difference]: Without dead ends: 590 [2021-05-22 02:33:39,042 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 146.8ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:39,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 590 states. [2021-05-22 02:33:39,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 590 to 471. [2021-05-22 02:33:39,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1148936170212767) internal successors, (1464), 470 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1464 transitions. [2021-05-22 02:33:39,047 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1464 transitions. Word has length 21 [2021-05-22 02:33:39,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:39,047 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1464 transitions. [2021-05-22 02:33:39,047 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,047 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1464 transitions. [2021-05-22 02:33:39,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:39,048 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:39,048 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:39,248 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5844,1000 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:39,248 INFO L430 AbstractCegarLoop]: === Iteration 1012 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:39,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:39,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1324147111, now seen corresponding path program 1000 times [2021-05-22 02:33:39,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:39,248 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924044107] [2021-05-22 02:33:39,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:39,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:39,320 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:39,320 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:39,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924044107] [2021-05-22 02:33:39,320 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924044107] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:39,320 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [251720215] [2021-05-22 02:33:39,320 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1001 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1001 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:39,345 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:39,346 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:39,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:39,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:39,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:39,381 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,385 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:39,385 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,386 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:33:39,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:39,423 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:39,425 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,431 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:39,431 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:39,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:39,432 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:33:39,449 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:39,449 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [251720215] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:39,449 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:39,449 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:39,449 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136041328] [2021-05-22 02:33:39,449 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:39,449 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:39,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:39,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:39,449 INFO L87 Difference]: Start difference. First operand 471 states and 1464 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:39,605 INFO L93 Difference]: Finished difference Result 582 states and 1786 transitions. [2021-05-22 02:33:39,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:39,605 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:39,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:39,606 INFO L225 Difference]: With dead ends: 582 [2021-05-22 02:33:39,606 INFO L226 Difference]: Without dead ends: 555 [2021-05-22 02:33:39,606 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 119.1ms TimeCoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:39,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-22 02:33:39,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 468. [2021-05-22 02:33:39,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1177730192719486) internal successors, (1456), 467 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1456 transitions. [2021-05-22 02:33:39,611 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1456 transitions. Word has length 21 [2021-05-22 02:33:39,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:39,611 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1456 transitions. [2021-05-22 02:33:39,611 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:39,611 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1456 transitions. [2021-05-22 02:33:39,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:39,612 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:39,612 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:39,812 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5852,1001 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:39,812 INFO L430 AbstractCegarLoop]: === Iteration 1013 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:39,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:39,813 INFO L82 PathProgramCache]: Analyzing trace with hash 699861347, now seen corresponding path program 1001 times [2021-05-22 02:33:39,813 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:39,813 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1438953742] [2021-05-22 02:33:39,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:39,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:39,885 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:39,886 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:39,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1438953742] [2021-05-22 02:33:39,886 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1438953742] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:39,886 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [888250246] [2021-05-22 02:33:39,886 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1002 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1002 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:39,911 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:39,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:39,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:39,912 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:39,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:39,951 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:39,953 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,962 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:39,962 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:39,962 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:39,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:39,989 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:39,999 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:40,002 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,010 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,011 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:40,011 INFO L518 ElimStorePlain]: Eliminatee v_prenex_294 vanished before elimination [2021-05-22 02:33:40,011 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:40,011 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:33:40,043 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:40,043 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [888250246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:40,043 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:40,044 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:40,044 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819845125] [2021-05-22 02:33:40,044 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:40,044 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:40,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:40,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:40,044 INFO L87 Difference]: Start difference. First operand 468 states and 1456 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:40,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:40,205 INFO L93 Difference]: Finished difference Result 622 states and 1911 transitions. [2021-05-22 02:33:40,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:40,205 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:40,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:40,206 INFO L225 Difference]: With dead ends: 622 [2021-05-22 02:33:40,206 INFO L226 Difference]: Without dead ends: 593 [2021-05-22 02:33:40,206 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 134.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:40,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 593 states. [2021-05-22 02:33:40,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 593 to 468. [2021-05-22 02:33:40,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1177730192719486) internal successors, (1456), 467 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:40,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1456 transitions. [2021-05-22 02:33:40,211 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1456 transitions. Word has length 21 [2021-05-22 02:33:40,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:40,211 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1456 transitions. [2021-05-22 02:33:40,211 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:40,211 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1456 transitions. [2021-05-22 02:33:40,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:40,212 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:40,212 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:40,412 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5856,1002 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:40,412 INFO L430 AbstractCegarLoop]: === Iteration 1014 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:40,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:40,412 INFO L82 PathProgramCache]: Analyzing trace with hash 997127757, now seen corresponding path program 1002 times [2021-05-22 02:33:40,413 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:40,413 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795690975] [2021-05-22 02:33:40,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:40,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:40,497 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:40,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:40,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795690975] [2021-05-22 02:33:40,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795690975] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:40,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696013544] [2021-05-22 02:33:40,497 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1003 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1003 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:40,522 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:40,523 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:40,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:40,523 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:40,603 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_295], 1=[o_0]} [2021-05-22 02:33:40,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:40,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,619 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,621 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:40,621 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:40,622 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,634 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,635 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:40,635 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:52, output treesize:36 [2021-05-22 02:33:40,684 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:40,685 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:40,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:40,686 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:40,689 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,706 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:40,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:40,707 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:40,721 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:40,722 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:40,722 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 4 variables, input treesize:64, output treesize:19 [2021-05-22 02:33:40,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:40,765 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696013544] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:40,765 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:40,765 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:40,765 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750421399] [2021-05-22 02:33:40,765 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:40,766 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:40,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:40,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:40,766 INFO L87 Difference]: Start difference. First operand 468 states and 1456 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:40,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:40,999 INFO L93 Difference]: Finished difference Result 700 states and 2136 transitions. [2021-05-22 02:33:40,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:40,999 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:40,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:41,000 INFO L225 Difference]: With dead ends: 700 [2021-05-22 02:33:41,000 INFO L226 Difference]: Without dead ends: 677 [2021-05-22 02:33:41,000 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 233.5ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:41,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 677 states. [2021-05-22 02:33:41,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 677 to 472. [2021-05-22 02:33:41,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1358811040339702) internal successors, (1477), 471 states have internal predecessors, (1477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:41,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1477 transitions. [2021-05-22 02:33:41,006 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1477 transitions. Word has length 21 [2021-05-22 02:33:41,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:41,006 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1477 transitions. [2021-05-22 02:33:41,006 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:41,006 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1477 transitions. [2021-05-22 02:33:41,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:41,006 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:41,006 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:41,207 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1003 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5861 [2021-05-22 02:33:41,207 INFO L430 AbstractCegarLoop]: === Iteration 1015 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:41,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:41,207 INFO L82 PathProgramCache]: Analyzing trace with hash 712865073, now seen corresponding path program 1003 times [2021-05-22 02:33:41,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:41,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1107953924] [2021-05-22 02:33:41,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:41,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:41,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:41,287 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:41,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1107953924] [2021-05-22 02:33:41,287 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1107953924] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:41,287 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [898665292] [2021-05-22 02:33:41,287 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1004 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1004 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:41,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:41,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:41,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:41,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:41,349 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:41,353 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:41,354 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:41,354 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:33:41,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:33:41,377 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:41,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:41,379 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:41,387 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:41,387 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:41,388 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:41,388 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:33:41,459 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:41,459 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [898665292] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:41,459 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:41,459 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:41,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579839674] [2021-05-22 02:33:41,459 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:41,459 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:41,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:41,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:41,459 INFO L87 Difference]: Start difference. First operand 472 states and 1477 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:41,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:41,754 INFO L93 Difference]: Finished difference Result 698 states and 2137 transitions. [2021-05-22 02:33:41,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:33:41,755 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:41,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:41,756 INFO L225 Difference]: With dead ends: 698 [2021-05-22 02:33:41,756 INFO L226 Difference]: Without dead ends: 671 [2021-05-22 02:33:41,756 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 277.2ms TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:41,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2021-05-22 02:33:41,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 470. [2021-05-22 02:33:41,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1257995735607675) internal successors, (1466), 469 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:41,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1466 transitions. [2021-05-22 02:33:41,761 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1466 transitions. Word has length 21 [2021-05-22 02:33:41,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:41,761 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1466 transitions. [2021-05-22 02:33:41,761 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:41,761 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1466 transitions. [2021-05-22 02:33:41,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:41,762 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:41,762 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:41,962 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1004 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5871 [2021-05-22 02:33:41,962 INFO L430 AbstractCegarLoop]: === Iteration 1016 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:41,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:41,962 INFO L82 PathProgramCache]: Analyzing trace with hash -711245251, now seen corresponding path program 1004 times [2021-05-22 02:33:41,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:41,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089992949] [2021-05-22 02:33:41,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:41,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:42,056 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:42,057 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:42,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089992949] [2021-05-22 02:33:42,057 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089992949] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:42,057 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [613238164] [2021-05-22 02:33:42,057 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1005 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1005 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:42,081 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:42,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:42,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:42,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:42,144 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:42,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:42,146 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,150 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:42,150 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,150 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:26, output treesize:19 [2021-05-22 02:33:42,187 INFO L446 ElimStorePlain]: Different costs {0=[o_2], 1=[o_4]} [2021-05-22 02:33:42,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:42,189 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,194 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:42,196 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:42,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:42,197 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,201 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:42,202 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,202 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:30, output treesize:7 [2021-05-22 02:33:42,228 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:42,229 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [613238164] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:42,229 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:42,229 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:42,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279646991] [2021-05-22 02:33:42,229 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:42,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:42,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:42,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=247, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:42,229 INFO L87 Difference]: Start difference. First operand 470 states and 1466 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:42,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:42,549 INFO L93 Difference]: Finished difference Result 736 states and 2259 transitions. [2021-05-22 02:33:42,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:42,549 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:42,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:42,550 INFO L225 Difference]: With dead ends: 736 [2021-05-22 02:33:42,550 INFO L226 Difference]: Without dead ends: 717 [2021-05-22 02:33:42,550 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 320.2ms TimeCoverageRelationStatistics Valid=123, Invalid=429, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:42,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2021-05-22 02:33:42,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 478. [2021-05-22 02:33:42,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 478 states, 477 states have (on average 3.1320754716981134) internal successors, (1494), 477 states have internal predecessors, (1494), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:42,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 478 states to 478 states and 1494 transitions. [2021-05-22 02:33:42,555 INFO L78 Accepts]: Start accepts. Automaton has 478 states and 1494 transitions. Word has length 21 [2021-05-22 02:33:42,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:42,556 INFO L482 AbstractCegarLoop]: Abstraction has 478 states and 1494 transitions. [2021-05-22 02:33:42,556 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:42,556 INFO L276 IsEmpty]: Start isEmpty. Operand 478 states and 1494 transitions. [2021-05-22 02:33:42,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:42,556 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:42,556 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:42,756 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1005 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5880 [2021-05-22 02:33:42,757 INFO L430 AbstractCegarLoop]: === Iteration 1017 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:42,757 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:42,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1550085565, now seen corresponding path program 1005 times [2021-05-22 02:33:42,757 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:42,757 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1896572612] [2021-05-22 02:33:42,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:42,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:42,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:42,850 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:42,850 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1896572612] [2021-05-22 02:33:42,851 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1896572612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:42,851 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147554855] [2021-05-22 02:33:42,851 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1006 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1006 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:42,875 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:33:42,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:42,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:42,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:42,973 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:42,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:42,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:42,980 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:42,981 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:33:42,982 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:33:43,018 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:43,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:43,019 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,026 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:43,028 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:43,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:43,029 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,035 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:43,036 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,036 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:38, output treesize:10 [2021-05-22 02:33:43,079 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:43,079 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [147554855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:43,079 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:43,079 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:43,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929175629] [2021-05-22 02:33:43,079 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:43,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:43,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:43,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:43,079 INFO L87 Difference]: Start difference. First operand 478 states and 1494 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:43,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:43,519 INFO L93 Difference]: Finished difference Result 728 states and 2239 transitions. [2021-05-22 02:33:43,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:43,519 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:43,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:43,520 INFO L225 Difference]: With dead ends: 728 [2021-05-22 02:33:43,520 INFO L226 Difference]: Without dead ends: 709 [2021-05-22 02:33:43,520 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 419.4ms TimeCoverageRelationStatistics Valid=123, Invalid=429, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:43,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2021-05-22 02:33:43,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 474. [2021-05-22 02:33:43,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.124735729386892) internal successors, (1478), 473 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:43,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1478 transitions. [2021-05-22 02:33:43,526 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1478 transitions. Word has length 21 [2021-05-22 02:33:43,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:43,526 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1478 transitions. [2021-05-22 02:33:43,526 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:43,526 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1478 transitions. [2021-05-22 02:33:43,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:43,527 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:43,527 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:43,727 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1006 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5882 [2021-05-22 02:33:43,727 INFO L430 AbstractCegarLoop]: === Iteration 1018 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:43,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:43,727 INFO L82 PathProgramCache]: Analyzing trace with hash -2126619563, now seen corresponding path program 1006 times [2021-05-22 02:33:43,727 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:43,727 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [455799845] [2021-05-22 02:33:43,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:43,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:43,808 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:43,808 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:43,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [455799845] [2021-05-22 02:33:43,808 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [455799845] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:43,808 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139270031] [2021-05-22 02:33:43,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1007 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1007 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:43,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:43,833 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:43,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:43,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:43,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:43,881 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,885 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:43,886 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,886 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:33:43,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:43,901 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,904 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:43,905 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:43,905 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:43,905 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:33:43,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:43,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139270031] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:43,917 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:43,917 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:43,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897869892] [2021-05-22 02:33:43,917 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:43,917 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:43,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:43,917 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:43,917 INFO L87 Difference]: Start difference. First operand 474 states and 1478 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:44,055 INFO L93 Difference]: Finished difference Result 592 states and 1828 transitions. [2021-05-22 02:33:44,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:44,056 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:44,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:44,057 INFO L225 Difference]: With dead ends: 592 [2021-05-22 02:33:44,057 INFO L226 Difference]: Without dead ends: 573 [2021-05-22 02:33:44,057 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 110.0ms TimeCoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:44,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 573 states. [2021-05-22 02:33:44,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 573 to 470. [2021-05-22 02:33:44,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1257995735607675) internal successors, (1466), 469 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1466 transitions. [2021-05-22 02:33:44,062 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1466 transitions. Word has length 21 [2021-05-22 02:33:44,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:44,062 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1466 transitions. [2021-05-22 02:33:44,062 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,062 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1466 transitions. [2021-05-22 02:33:44,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:44,062 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:44,062 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:44,263 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5885,1007 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:44,263 INFO L430 AbstractCegarLoop]: === Iteration 1019 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:44,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:44,263 INFO L82 PathProgramCache]: Analyzing trace with hash 110136757, now seen corresponding path program 1007 times [2021-05-22 02:33:44,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:44,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967860697] [2021-05-22 02:33:44,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:44,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:44,334 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:44,334 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:44,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967860697] [2021-05-22 02:33:44,334 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967860697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:44,334 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [616011377] [2021-05-22 02:33:44,334 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1008 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1008 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:44,359 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:44,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:44,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:44,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:44,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:44,405 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,409 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:44,409 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,409 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:33:44,428 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:44,429 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:44,431 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,437 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:44,437 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:44,438 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:44,438 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:33:44,454 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:44,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [616011377] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:44,454 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:44,454 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:44,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416219184] [2021-05-22 02:33:44,455 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:44,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:44,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:44,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:44,455 INFO L87 Difference]: Start difference. First operand 470 states and 1466 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:44,621 INFO L93 Difference]: Finished difference Result 591 states and 1819 transitions. [2021-05-22 02:33:44,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:44,621 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:44,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:44,622 INFO L225 Difference]: With dead ends: 591 [2021-05-22 02:33:44,622 INFO L226 Difference]: Without dead ends: 555 [2021-05-22 02:33:44,622 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 103.3ms TimeCoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:44,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2021-05-22 02:33:44,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 470. [2021-05-22 02:33:44,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1257995735607675) internal successors, (1466), 469 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1466 transitions. [2021-05-22 02:33:44,627 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1466 transitions. Word has length 21 [2021-05-22 02:33:44,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:44,627 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1466 transitions. [2021-05-22 02:33:44,627 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:44,627 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1466 transitions. [2021-05-22 02:33:44,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:44,627 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:44,627 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:44,828 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5887,1008 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:44,828 INFO L430 AbstractCegarLoop]: === Iteration 1020 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:44,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:44,828 INFO L82 PathProgramCache]: Analyzing trace with hash -984562161, now seen corresponding path program 1008 times [2021-05-22 02:33:44,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:44,828 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1121988867] [2021-05-22 02:33:44,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:44,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:44,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:44,898 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:44,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1121988867] [2021-05-22 02:33:44,898 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1121988867] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:44,898 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250780865] [2021-05-22 02:33:44,898 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1009 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1009 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:44,923 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:44,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:44,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:44,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:44,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:44,973 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:44,975 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:44,981 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:44,982 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:44,982 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:33:45,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:45,007 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,014 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:45,015 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:45,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:45,017 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,023 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:45,023 INFO L518 ElimStorePlain]: Eliminatee v_prenex_297 vanished before elimination [2021-05-22 02:33:45,023 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:45,023 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:33:45,050 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:45,051 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250780865] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:45,051 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:45,051 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:45,051 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309039308] [2021-05-22 02:33:45,051 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:45,051 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:45,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:45,051 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:45,051 INFO L87 Difference]: Start difference. First operand 470 states and 1466 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:45,244 INFO L93 Difference]: Finished difference Result 632 states and 1938 transitions. [2021-05-22 02:33:45,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:33:45,244 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:45,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:45,245 INFO L225 Difference]: With dead ends: 632 [2021-05-22 02:33:45,245 INFO L226 Difference]: Without dead ends: 605 [2021-05-22 02:33:45,245 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 137.9ms TimeCoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:45,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2021-05-22 02:33:45,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 485. [2021-05-22 02:33:45,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.12396694214876) internal successors, (1512), 484 states have internal predecessors, (1512), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1512 transitions. [2021-05-22 02:33:45,250 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1512 transitions. Word has length 21 [2021-05-22 02:33:45,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:45,250 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1512 transitions. [2021-05-22 02:33:45,250 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,250 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1512 transitions. [2021-05-22 02:33:45,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:45,251 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:45,251 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:45,451 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1009 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5890 [2021-05-22 02:33:45,451 INFO L430 AbstractCegarLoop]: === Iteration 1021 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:45,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:45,451 INFO L82 PathProgramCache]: Analyzing trace with hash 896190777, now seen corresponding path program 1009 times [2021-05-22 02:33:45,451 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:45,451 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1452049503] [2021-05-22 02:33:45,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:45,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:45,518 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:45,519 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:45,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1452049503] [2021-05-22 02:33:45,519 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1452049503] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:45,519 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888053661] [2021-05-22 02:33:45,519 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1010 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1010 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:45,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:45,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:45,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:45,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:45,593 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:45,595 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,601 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:45,602 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:45,602 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:33:45,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:45,631 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,633 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:45,633 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:45,634 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:45,634 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:45,643 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:45,643 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888053661] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:45,643 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:45,643 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:45,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158181899] [2021-05-22 02:33:45,643 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:45,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:45,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:45,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:45,644 INFO L87 Difference]: Start difference. First operand 485 states and 1512 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:45,791 INFO L93 Difference]: Finished difference Result 582 states and 1785 transitions. [2021-05-22 02:33:45,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:45,791 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:45,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:45,792 INFO L225 Difference]: With dead ends: 582 [2021-05-22 02:33:45,792 INFO L226 Difference]: Without dead ends: 561 [2021-05-22 02:33:45,792 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 108.1ms TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:45,792 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 561 states. [2021-05-22 02:33:45,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 561 to 467. [2021-05-22 02:33:45,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.128755364806867) internal successors, (1458), 466 states have internal predecessors, (1458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1458 transitions. [2021-05-22 02:33:45,797 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1458 transitions. Word has length 21 [2021-05-22 02:33:45,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:45,797 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1458 transitions. [2021-05-22 02:33:45,797 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:45,797 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1458 transitions. [2021-05-22 02:33:45,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:45,797 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:45,797 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:45,998 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5898,1010 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:45,998 INFO L430 AbstractCegarLoop]: === Iteration 1022 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:45,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:45,998 INFO L82 PathProgramCache]: Analyzing trace with hash 1548483819, now seen corresponding path program 1010 times [2021-05-22 02:33:45,998 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:45,998 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583292113] [2021-05-22 02:33:45,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:46,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:46,071 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:46,071 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:46,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583292113] [2021-05-22 02:33:46,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583292113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:46,072 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [809330862] [2021-05-22 02:33:46,072 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1011 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1011 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:46,096 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:46,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:46,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:46,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:46,126 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:46,126 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,131 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,132 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:33:46,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:46,152 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:46,155 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,163 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,163 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:46,164 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:46,164 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:33:46,196 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:46,196 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [809330862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:46,196 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:46,196 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:46,196 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916325498] [2021-05-22 02:33:46,196 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:46,196 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:46,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:46,196 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:46,196 INFO L87 Difference]: Start difference. First operand 467 states and 1458 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:46,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:46,354 INFO L93 Difference]: Finished difference Result 606 states and 1859 transitions. [2021-05-22 02:33:46,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:46,355 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:46,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:46,356 INFO L225 Difference]: With dead ends: 606 [2021-05-22 02:33:46,356 INFO L226 Difference]: Without dead ends: 570 [2021-05-22 02:33:46,356 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 108.0ms TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:46,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 570 states. [2021-05-22 02:33:46,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 570 to 468. [2021-05-22 02:33:46,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.132762312633833) internal successors, (1463), 467 states have internal predecessors, (1463), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:46,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1463 transitions. [2021-05-22 02:33:46,361 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1463 transitions. Word has length 21 [2021-05-22 02:33:46,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:46,361 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1463 transitions. [2021-05-22 02:33:46,361 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:46,361 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1463 transitions. [2021-05-22 02:33:46,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:46,361 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:46,362 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:46,562 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5901,1011 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:46,562 INFO L430 AbstractCegarLoop]: === Iteration 1023 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:46,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:46,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1845750229, now seen corresponding path program 1011 times [2021-05-22 02:33:46,562 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:46,562 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [684772671] [2021-05-22 02:33:46,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:46,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:46,651 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:46,652 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:46,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [684772671] [2021-05-22 02:33:46,652 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [684772671] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:46,652 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498345323] [2021-05-22 02:33:46,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1012 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1012 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:46,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:46,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:46,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:46,678 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:46,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:46,734 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:46,737 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,752 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,753 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:46,753 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:46,786 INFO L446 ElimStorePlain]: Different costs {0=[o_0, o_4], 1=[v_prenex_298, v_prenex_299]} [2021-05-22 02:33:46,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:46,790 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,802 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,802 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:46,804 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:46,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:46,805 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,815 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,817 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:46,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:46,818 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:46,828 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:46,829 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:46,829 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 5 variables, input treesize:51, output treesize:19 [2021-05-22 02:33:46,880 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:46,880 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498345323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:46,880 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:46,880 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:33:46,881 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55787724] [2021-05-22 02:33:46,881 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:33:46,881 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:46,881 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:33:46,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:46,881 INFO L87 Difference]: Start difference. First operand 468 states and 1463 transitions. Second operand has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:47,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:47,101 INFO L93 Difference]: Finished difference Result 713 states and 2182 transitions. [2021-05-22 02:33:47,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:33:47,102 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:47,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:47,103 INFO L225 Difference]: With dead ends: 713 [2021-05-22 02:33:47,103 INFO L226 Difference]: Without dead ends: 690 [2021-05-22 02:33:47,103 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 189.5ms TimeCoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:47,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-05-22 02:33:47,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 474. [2021-05-22 02:33:47,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.141649048625793) internal successors, (1486), 473 states have internal predecessors, (1486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:47,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1486 transitions. [2021-05-22 02:33:47,108 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1486 transitions. Word has length 21 [2021-05-22 02:33:47,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:47,108 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1486 transitions. [2021-05-22 02:33:47,108 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:47,108 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1486 transitions. [2021-05-22 02:33:47,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:47,109 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:47,109 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:47,309 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5904,1012 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:47,309 INFO L430 AbstractCegarLoop]: === Iteration 1024 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:47,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:47,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1561487545, now seen corresponding path program 1012 times [2021-05-22 02:33:47,309 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:47,309 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [521876600] [2021-05-22 02:33:47,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:47,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:47,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:47,396 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:47,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [521876600] [2021-05-22 02:33:47,396 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [521876600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:47,396 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803474210] [2021-05-22 02:33:47,396 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1013 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1013 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:47,421 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:47,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:47,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:47,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:47,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:47,456 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:47,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:47,458 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:47,466 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:47,467 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:47,467 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:47,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:47,493 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:47,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:47,503 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:47,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:47,505 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:47,513 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:47,514 INFO L518 ElimStorePlain]: Eliminatee v_prenex_301 vanished before elimination [2021-05-22 02:33:47,514 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:47,514 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:33:47,585 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:47,585 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803474210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:47,585 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:47,585 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:47,585 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230913009] [2021-05-22 02:33:47,585 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:47,585 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:47,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:47,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:47,586 INFO L87 Difference]: Start difference. First operand 474 states and 1486 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:48,001 INFO L93 Difference]: Finished difference Result 744 states and 2268 transitions. [2021-05-22 02:33:48,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:33:48,001 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:48,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:48,002 INFO L225 Difference]: With dead ends: 744 [2021-05-22 02:33:48,002 INFO L226 Difference]: Without dead ends: 717 [2021-05-22 02:33:48,003 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 323.2ms TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:33:48,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2021-05-22 02:33:48,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 492. [2021-05-22 02:33:48,007 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 491 states have (on average 3.1486761710794298) internal successors, (1546), 491 states have internal predecessors, (1546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1546 transitions. [2021-05-22 02:33:48,008 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1546 transitions. Word has length 21 [2021-05-22 02:33:48,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:48,008 INFO L482 AbstractCegarLoop]: Abstraction has 492 states and 1546 transitions. [2021-05-22 02:33:48,008 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,008 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1546 transitions. [2021-05-22 02:33:48,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:48,009 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:48,009 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:48,209 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1013 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5913 [2021-05-22 02:33:48,209 INFO L430 AbstractCegarLoop]: === Iteration 1025 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:48,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:48,209 INFO L82 PathProgramCache]: Analyzing trace with hash -399259421, now seen corresponding path program 1013 times [2021-05-22 02:33:48,209 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:48,209 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713372247] [2021-05-22 02:33:48,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:48,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:48,300 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:48,301 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:48,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713372247] [2021-05-22 02:33:48,301 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713372247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:48,301 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187569432] [2021-05-22 02:33:48,301 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1014 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1014 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:48,327 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:48,328 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:48,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:48,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:48,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:48,379 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:48,381 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,397 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:48,398 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:48,398 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:33:48,448 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,449 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:48,450 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:48,453 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:48,478 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:48,480 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,482 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:48,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:48,482 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:48,503 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:48,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:48,505 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:77, output treesize:31 [2021-05-22 02:33:48,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:48,582 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187569432] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:48,582 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:48,582 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:48,582 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1568955792] [2021-05-22 02:33:48,582 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:48,582 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:48,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:48,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=251, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:48,583 INFO L87 Difference]: Start difference. First operand 492 states and 1546 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:48,952 INFO L93 Difference]: Finished difference Result 761 states and 2350 transitions. [2021-05-22 02:33:48,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:33:48,952 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:48,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:48,953 INFO L225 Difference]: With dead ends: 761 [2021-05-22 02:33:48,953 INFO L226 Difference]: Without dead ends: 742 [2021-05-22 02:33:48,953 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 325.5ms TimeCoverageRelationStatistics Valid=98, Invalid=408, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:48,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 742 states. [2021-05-22 02:33:48,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 742 to 490. [2021-05-22 02:33:48,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 490 states, 489 states have (on average 3.1513292433537834) internal successors, (1541), 489 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 1541 transitions. [2021-05-22 02:33:48,959 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 1541 transitions. Word has length 21 [2021-05-22 02:33:48,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:48,959 INFO L482 AbstractCegarLoop]: Abstraction has 490 states and 1541 transitions. [2021-05-22 02:33:48,959 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:48,959 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 1541 transitions. [2021-05-22 02:33:48,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:48,960 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:48,960 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:49,165 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5924,1014 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:49,165 INFO L430 AbstractCegarLoop]: === Iteration 1026 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:49,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:49,166 INFO L82 PathProgramCache]: Analyzing trace with hash 146113233, now seen corresponding path program 1014 times [2021-05-22 02:33:49,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:49,166 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104405163] [2021-05-22 02:33:49,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:49,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:49,236 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:49,236 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:49,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104405163] [2021-05-22 02:33:49,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104405163] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:49,236 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [372596704] [2021-05-22 02:33:49,236 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1015 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1015 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:49,262 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:49,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:49,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:49,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:49,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:49,298 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:49,301 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,309 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:49,310 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:49,310 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:49,365 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:49,366 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,368 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:49,368 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:49,369 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,369 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:49,378 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:49,379 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [372596704] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:49,379 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:49,379 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:49,379 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72949326] [2021-05-22 02:33:49,379 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:49,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:49,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:49,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:49,379 INFO L87 Difference]: Start difference. First operand 490 states and 1541 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:49,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:49,570 INFO L93 Difference]: Finished difference Result 616 states and 1886 transitions. [2021-05-22 02:33:49,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:49,571 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:49,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:49,571 INFO L225 Difference]: With dead ends: 616 [2021-05-22 02:33:49,571 INFO L226 Difference]: Without dead ends: 595 [2021-05-22 02:33:49,572 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 132.9ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:49,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2021-05-22 02:33:49,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 486. [2021-05-22 02:33:49,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 486 states, 485 states have (on average 3.1525773195876288) internal successors, (1529), 485 states have internal predecessors, (1529), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:49,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 486 states to 486 states and 1529 transitions. [2021-05-22 02:33:49,577 INFO L78 Accepts]: Start accepts. Automaton has 486 states and 1529 transitions. Word has length 21 [2021-05-22 02:33:49,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:49,577 INFO L482 AbstractCegarLoop]: Abstraction has 486 states and 1529 transitions. [2021-05-22 02:33:49,577 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:49,577 INFO L276 IsEmpty]: Start isEmpty. Operand 486 states and 1529 transitions. [2021-05-22 02:33:49,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:49,577 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:49,577 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:49,777 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5931,1015 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:49,778 INFO L430 AbstractCegarLoop]: === Iteration 1027 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:49,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:49,778 INFO L82 PathProgramCache]: Analyzing trace with hash -1572871449, now seen corresponding path program 1015 times [2021-05-22 02:33:49,778 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:49,778 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1546156330] [2021-05-22 02:33:49,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:49,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:49,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:49,856 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:49,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1546156330] [2021-05-22 02:33:49,856 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1546156330] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:49,856 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [617367186] [2021-05-22 02:33:49,856 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1016 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1016 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:49,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:49,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:49,882 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:49,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:49,915 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:49,918 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,926 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:49,927 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:49,927 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:33:49,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:49,960 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,964 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:49,964 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:49,964 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:49,964 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:33:50,006 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:50,007 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [617367186] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:50,007 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:50,007 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:50,007 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513993191] [2021-05-22 02:33:50,007 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:50,007 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:50,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:50,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:50,007 INFO L87 Difference]: Start difference. First operand 486 states and 1529 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:50,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:50,312 INFO L93 Difference]: Finished difference Result 662 states and 2035 transitions. [2021-05-22 02:33:50,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:33:50,312 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:50,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:50,313 INFO L225 Difference]: With dead ends: 662 [2021-05-22 02:33:50,313 INFO L226 Difference]: Without dead ends: 641 [2021-05-22 02:33:50,313 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 238.4ms TimeCoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:33:50,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2021-05-22 02:33:50,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 469. [2021-05-22 02:33:50,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1324786324786325) internal successors, (1466), 468 states have internal predecessors, (1466), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:50,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1466 transitions. [2021-05-22 02:33:50,318 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1466 transitions. Word has length 21 [2021-05-22 02:33:50,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:50,318 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1466 transitions. [2021-05-22 02:33:50,318 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:50,318 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1466 transitions. [2021-05-22 02:33:50,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:50,319 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:50,319 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:50,519 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5937,1016 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:50,519 INFO L430 AbstractCegarLoop]: === Iteration 1028 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:50,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:50,520 INFO L82 PathProgramCache]: Analyzing trace with hash -1918116401, now seen corresponding path program 1016 times [2021-05-22 02:33:50,520 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:50,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198786157] [2021-05-22 02:33:50,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:50,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:50,600 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:50,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:50,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198786157] [2021-05-22 02:33:50,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198786157] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:50,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [481136499] [2021-05-22 02:33:50,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1017 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1017 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:50,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:50,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:50,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:50,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:50,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:50,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:50,698 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:50,698 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:50,698 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:33:50,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:50,732 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:50,734 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:50,734 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:50,734 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:50,735 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:50,759 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:50,759 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [481136499] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:50,759 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:50,759 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:50,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611925809] [2021-05-22 02:33:50,759 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:50,759 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:50,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:50,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=218, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:50,760 INFO L87 Difference]: Start difference. First operand 469 states and 1466 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:51,099 INFO L93 Difference]: Finished difference Result 732 states and 2236 transitions. [2021-05-22 02:33:51,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:33:51,099 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:51,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:51,100 INFO L225 Difference]: With dead ends: 732 [2021-05-22 02:33:51,100 INFO L226 Difference]: Without dead ends: 713 [2021-05-22 02:33:51,101 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 306.0ms TimeCoverageRelationStatistics Valid=117, Invalid=389, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:33:51,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 713 states. [2021-05-22 02:33:51,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 713 to 473. [2021-05-22 02:33:51,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1313559322033897) internal successors, (1478), 472 states have internal predecessors, (1478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1478 transitions. [2021-05-22 02:33:51,106 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1478 transitions. Word has length 21 [2021-05-22 02:33:51,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:51,106 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1478 transitions. [2021-05-22 02:33:51,106 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,106 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1478 transitions. [2021-05-22 02:33:51,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:51,107 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:51,107 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:51,307 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5940,1017 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:51,307 INFO L430 AbstractCegarLoop]: === Iteration 1029 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:51,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:51,307 INFO L82 PathProgramCache]: Analyzing trace with hash 343214415, now seen corresponding path program 1017 times [2021-05-22 02:33:51,307 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:51,307 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020899398] [2021-05-22 02:33:51,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:51,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:51,382 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:51,382 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:51,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020899398] [2021-05-22 02:33:51,382 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020899398] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:51,382 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [725622831] [2021-05-22 02:33:51,382 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1018 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1018 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:51,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:33:51,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:51,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:51,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:51,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:51,477 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:51,481 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,481 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:33:51,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:51,500 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,504 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:51,504 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:51,504 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,504 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:33:51,516 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:51,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [725622831] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:51,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:51,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:51,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51903883] [2021-05-22 02:33:51,516 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:51,517 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:51,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:51,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:51,517 INFO L87 Difference]: Start difference. First operand 473 states and 1478 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:51,650 INFO L93 Difference]: Finished difference Result 618 states and 1901 transitions. [2021-05-22 02:33:51,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:51,650 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:51,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:51,651 INFO L225 Difference]: With dead ends: 618 [2021-05-22 02:33:51,651 INFO L226 Difference]: Without dead ends: 599 [2021-05-22 02:33:51,651 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 126.6ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:51,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2021-05-22 02:33:51,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 469. [2021-05-22 02:33:51,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.123931623931624) internal successors, (1462), 468 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1462 transitions. [2021-05-22 02:33:51,656 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1462 transitions. Word has length 21 [2021-05-22 02:33:51,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:51,656 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1462 transitions. [2021-05-22 02:33:51,656 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:51,656 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1462 transitions. [2021-05-22 02:33:51,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:51,657 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:51,657 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:51,857 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5943,1018 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:51,857 INFO L430 AbstractCegarLoop]: === Iteration 1030 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:51,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:51,857 INFO L82 PathProgramCache]: Analyzing trace with hash 961476583, now seen corresponding path program 1018 times [2021-05-22 02:33:51,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:51,857 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760217342] [2021-05-22 02:33:51,858 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:51,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:51,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:51,931 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:51,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760217342] [2021-05-22 02:33:51,931 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [760217342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:51,931 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101075566] [2021-05-22 02:33:51,931 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1019 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1019 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:51,957 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:51,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:51,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:51,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:51,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:51,993 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,996 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:51,997 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:51,997 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:33:52,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:52,012 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,015 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:52,015 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:52,016 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,016 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:33:52,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:52,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101075566] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:52,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:52,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:33:52,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285882254] [2021-05-22 02:33:52,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:33:52,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:52,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:33:52,028 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:33:52,028 INFO L87 Difference]: Start difference. First operand 469 states and 1462 transitions. Second operand has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:52,154 INFO L93 Difference]: Finished difference Result 616 states and 1881 transitions. [2021-05-22 02:33:52,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:52,155 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:52,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:52,156 INFO L225 Difference]: With dead ends: 616 [2021-05-22 02:33:52,156 INFO L226 Difference]: Without dead ends: 597 [2021-05-22 02:33:52,156 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 90.5ms TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:33:52,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 597 states. [2021-05-22 02:33:52,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 597 to 453. [2021-05-22 02:33:52,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 453 states, 452 states have (on average 3.1106194690265485) internal successors, (1406), 452 states have internal predecessors, (1406), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 453 states to 453 states and 1406 transitions. [2021-05-22 02:33:52,160 INFO L78 Accepts]: Start accepts. Automaton has 453 states and 1406 transitions. Word has length 21 [2021-05-22 02:33:52,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:52,160 INFO L482 AbstractCegarLoop]: Abstraction has 453 states and 1406 transitions. [2021-05-22 02:33:52,160 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.076923076923077) internal successors, (27), 13 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,161 INFO L276 IsEmpty]: Start isEmpty. Operand 453 states and 1406 transitions. [2021-05-22 02:33:52,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:52,161 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:52,161 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:52,361 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1019 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5946 [2021-05-22 02:33:52,361 INFO L430 AbstractCegarLoop]: === Iteration 1031 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:52,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:52,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1656277809, now seen corresponding path program 1019 times [2021-05-22 02:33:52,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:52,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564136771] [2021-05-22 02:33:52,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:52,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:52,427 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:52,427 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:52,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564136771] [2021-05-22 02:33:52,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564136771] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:52,427 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [718288160] [2021-05-22 02:33:52,427 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1020 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1020 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:52,452 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:52,452 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:52,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:52,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:52,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:52,477 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,480 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:52,480 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,480 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:33:52,491 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:52,492 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:52,494 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:52,508 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:52,509 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:52,509 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:52,509 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:33:52,577 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:52,577 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [718288160] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:52,577 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:52,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:33:52,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728456396] [2021-05-22 02:33:52,578 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:33:52,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:52,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:33:52,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:52,578 INFO L87 Difference]: Start difference. First operand 453 states and 1406 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:52,787 INFO L93 Difference]: Finished difference Result 672 states and 2043 transitions. [2021-05-22 02:33:52,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:33:52,787 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:52,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:52,788 INFO L225 Difference]: With dead ends: 672 [2021-05-22 02:33:52,788 INFO L226 Difference]: Without dead ends: 653 [2021-05-22 02:33:52,788 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 182.9ms TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:52,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2021-05-22 02:33:52,792 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 446. [2021-05-22 02:33:52,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.1123595505617976) internal successors, (1385), 445 states have internal predecessors, (1385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1385 transitions. [2021-05-22 02:33:52,793 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1385 transitions. Word has length 21 [2021-05-22 02:33:52,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:52,793 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1385 transitions. [2021-05-22 02:33:52,793 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:52,793 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1385 transitions. [2021-05-22 02:33:52,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:52,794 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:52,794 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:52,994 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5948,1020 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:52,994 INFO L430 AbstractCegarLoop]: === Iteration 1032 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:52,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:52,994 INFO L82 PathProgramCache]: Analyzing trace with hash 564129229, now seen corresponding path program 1020 times [2021-05-22 02:33:52,995 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:52,995 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492008216] [2021-05-22 02:33:52,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:52,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:53,072 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:53,073 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:53,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492008216] [2021-05-22 02:33:53,073 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492008216] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:53,073 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [681843841] [2021-05-22 02:33:53,073 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1021 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1021 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:53,098 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:53,098 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:53,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:53,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:53,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:53,121 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,124 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:53,124 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,125 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:22, output treesize:14 [2021-05-22 02:33:53,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:53,145 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:53,148 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,154 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:53,154 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:53,154 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:53,154 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:15 [2021-05-22 02:33:53,171 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:53,171 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [681843841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:53,171 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:53,171 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:33:53,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86348758] [2021-05-22 02:33:53,171 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:33:53,171 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:53,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:33:53,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:33:53,172 INFO L87 Difference]: Start difference. First operand 446 states and 1385 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:53,312 INFO L93 Difference]: Finished difference Result 618 states and 1891 transitions. [2021-05-22 02:33:53,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:53,312 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:53,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:53,313 INFO L225 Difference]: With dead ends: 618 [2021-05-22 02:33:53,313 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:33:53,313 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 100.5ms TimeCoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:33:53,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:33:53,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 451. [2021-05-22 02:33:53,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.1066666666666665) internal successors, (1398), 450 states have internal predecessors, (1398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1398 transitions. [2021-05-22 02:33:53,317 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1398 transitions. Word has length 21 [2021-05-22 02:33:53,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:53,318 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1398 transitions. [2021-05-22 02:33:53,318 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,318 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1398 transitions. [2021-05-22 02:33:53,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:53,318 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:53,318 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:53,518 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5953,1021 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:53,519 INFO L430 AbstractCegarLoop]: === Iteration 1033 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:53,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:53,519 INFO L82 PathProgramCache]: Analyzing trace with hash -530569689, now seen corresponding path program 1021 times [2021-05-22 02:33:53,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:53,519 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129921862] [2021-05-22 02:33:53,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:53,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:53,581 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:53,581 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:53,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129921862] [2021-05-22 02:33:53,581 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129921862] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:53,581 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590276040] [2021-05-22 02:33:53,581 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1022 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1022 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:53,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:53,607 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:53,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:53,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:53,633 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:53,635 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,638 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:53,638 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:53,638 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:33:53,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:53,656 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:53,658 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:53,664 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:53,664 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:53,664 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:53,664 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:37, output treesize:13 [2021-05-22 02:33:53,690 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:53,691 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590276040] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:53,691 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:53,691 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:33:53,691 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017933881] [2021-05-22 02:33:53,691 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:33:53,691 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:53,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:33:53,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:33:53,691 INFO L87 Difference]: Start difference. First operand 451 states and 1398 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:53,852 INFO L93 Difference]: Finished difference Result 740 states and 2250 transitions. [2021-05-22 02:33:53,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:33:53,853 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:53,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:53,854 INFO L225 Difference]: With dead ends: 740 [2021-05-22 02:33:53,854 INFO L226 Difference]: Without dead ends: 713 [2021-05-22 02:33:53,854 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 121.9ms TimeCoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:53,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 713 states. [2021-05-22 02:33:53,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 713 to 471. [2021-05-22 02:33:53,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1106382978723404) internal successors, (1462), 470 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1462 transitions. [2021-05-22 02:33:53,859 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1462 transitions. Word has length 21 [2021-05-22 02:33:53,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:53,859 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1462 transitions. [2021-05-22 02:33:53,859 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:53,859 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1462 transitions. [2021-05-22 02:33:53,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:53,860 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:53,860 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:54,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1022 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5956 [2021-05-22 02:33:54,060 INFO L430 AbstractCegarLoop]: === Iteration 1034 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:54,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:54,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1350183249, now seen corresponding path program 1022 times [2021-05-22 02:33:54,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:54,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45039061] [2021-05-22 02:33:54,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:54,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:54,123 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:54,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:54,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45039061] [2021-05-22 02:33:54,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [45039061] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:54,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767865161] [2021-05-22 02:33:54,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1023 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1023 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:54,148 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:54,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:54,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:54,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:54,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:54,183 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:54,185 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,188 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:54,188 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:54,188 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:33:54,209 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:54,210 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,214 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:54,214 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:54,214 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,214 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:54,228 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:54,228 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767865161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:54,228 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:54,228 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:33:54,228 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410466289] [2021-05-22 02:33:54,228 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:33:54,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:54,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:33:54,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:33:54,229 INFO L87 Difference]: Start difference. First operand 471 states and 1462 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:54,350 INFO L93 Difference]: Finished difference Result 713 states and 2168 transitions. [2021-05-22 02:33:54,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:54,350 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:54,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:54,351 INFO L225 Difference]: With dead ends: 713 [2021-05-22 02:33:54,351 INFO L226 Difference]: Without dead ends: 692 [2021-05-22 02:33:54,351 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 80.3ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:33:54,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 692 states. [2021-05-22 02:33:54,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 692 to 468. [2021-05-22 02:33:54,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.113490364025696) internal successors, (1454), 467 states have internal predecessors, (1454), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1454 transitions. [2021-05-22 02:33:54,356 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1454 transitions. Word has length 21 [2021-05-22 02:33:54,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:54,356 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1454 transitions. [2021-05-22 02:33:54,356 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,356 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1454 transitions. [2021-05-22 02:33:54,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:54,357 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:54,357 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:54,557 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5963,1023 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:54,557 INFO L430 AbstractCegarLoop]: === Iteration 1035 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:54,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:54,558 INFO L82 PathProgramCache]: Analyzing trace with hash 1856529515, now seen corresponding path program 1023 times [2021-05-22 02:33:54,558 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:54,558 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940411931] [2021-05-22 02:33:54,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:54,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:54,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:54,615 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:54,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940411931] [2021-05-22 02:33:54,615 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940411931] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:54,615 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1519490006] [2021-05-22 02:33:54,615 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1024 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1024 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:54,640 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:54,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:54,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:54,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:54,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:54,667 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:54,668 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:54,671 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:54,671 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:29, output treesize:11 [2021-05-22 02:33:54,682 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:54,682 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,685 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:54,685 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:54,692 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:54,693 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:54,706 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:54,706 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1519490006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:54,706 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:54,706 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:33:54,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486621063] [2021-05-22 02:33:54,706 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:33:54,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:54,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:33:54,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:33:54,707 INFO L87 Difference]: Start difference. First operand 468 states and 1454 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:54,808 INFO L93 Difference]: Finished difference Result 716 states and 2186 transitions. [2021-05-22 02:33:54,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:54,808 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:54,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:54,809 INFO L225 Difference]: With dead ends: 716 [2021-05-22 02:33:54,809 INFO L226 Difference]: Without dead ends: 695 [2021-05-22 02:33:54,809 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 64.0ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:33:54,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2021-05-22 02:33:54,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 441. [2021-05-22 02:33:54,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 3.118181818181818) internal successors, (1372), 440 states have internal predecessors, (1372), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 1372 transitions. [2021-05-22 02:33:54,816 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 1372 transitions. Word has length 21 [2021-05-22 02:33:54,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:54,816 INFO L482 AbstractCegarLoop]: Abstraction has 441 states and 1372 transitions. [2021-05-22 02:33:54,816 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:54,816 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 1372 transitions. [2021-05-22 02:33:54,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:54,817 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:54,817 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:55,017 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5966,1024 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:55,017 INFO L430 AbstractCegarLoop]: === Iteration 1036 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:55,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:55,017 INFO L82 PathProgramCache]: Analyzing trace with hash -195880187, now seen corresponding path program 1024 times [2021-05-22 02:33:55,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:55,017 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617930894] [2021-05-22 02:33:55,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:55,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:55,091 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:55,091 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:55,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617930894] [2021-05-22 02:33:55,091 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617930894] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:55,091 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576568404] [2021-05-22 02:33:55,091 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1025 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1025 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:55,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:33:55,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:55,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:55,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:55,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:55,135 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,138 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,139 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,139 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:33:55,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:33:55,161 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:33:55,163 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,171 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,172 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:55,172 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:55,172 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:33:55,204 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:55,204 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576568404] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:55,204 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:55,204 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:33:55,205 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290696816] [2021-05-22 02:33:55,205 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:33:55,205 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:55,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:33:55,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:33:55,205 INFO L87 Difference]: Start difference. First operand 441 states and 1372 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:55,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:55,366 INFO L93 Difference]: Finished difference Result 638 states and 1944 transitions. [2021-05-22 02:33:55,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:55,367 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:55,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:55,367 INFO L225 Difference]: With dead ends: 638 [2021-05-22 02:33:55,367 INFO L226 Difference]: Without dead ends: 591 [2021-05-22 02:33:55,367 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 121.1ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:55,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 591 states. [2021-05-22 02:33:55,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 591 to 449. [2021-05-22 02:33:55,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.125) internal successors, (1400), 448 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:55,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1400 transitions. [2021-05-22 02:33:55,372 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1400 transitions. Word has length 21 [2021-05-22 02:33:55,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:55,372 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1400 transitions. [2021-05-22 02:33:55,372 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:55,372 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1400 transitions. [2021-05-22 02:33:55,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:55,373 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:55,373 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:55,573 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1025 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5969 [2021-05-22 02:33:55,573 INFO L430 AbstractCegarLoop]: === Iteration 1037 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:55,573 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:55,574 INFO L82 PathProgramCache]: Analyzing trace with hash 101386223, now seen corresponding path program 1025 times [2021-05-22 02:33:55,574 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:55,574 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1447163494] [2021-05-22 02:33:55,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:55,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:55,657 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:55,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1447163494] [2021-05-22 02:33:55,657 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1447163494] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:55,657 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995638323] [2021-05-22 02:33:55,658 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1026 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1026 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:55,683 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:33:55,684 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:55,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:33:55,684 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:55,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:55,718 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:55,721 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,732 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,733 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:55,733 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:33:55,795 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_302, v_prenex_303], 1=[o_0, o_4]} [2021-05-22 02:33:55,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:55,799 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:55,802 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,839 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,839 INFO L518 ElimStorePlain]: Eliminatee v_prenex_303 vanished before elimination [2021-05-22 02:33:55,842 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,842 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,842 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:55,843 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,845 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:55,846 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,878 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,881 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,882 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:55,882 INFO L550 ElimStorePlain]: Start of recursive call 6: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,884 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:55,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:55,885 INFO L550 ElimStorePlain]: Start of recursive call 7: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:55,916 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:55,917 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 4 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:33:55,917 INFO L247 ElimStorePlain]: Needed 7 recursive calls to eliminate 5 variables, input treesize:121, output treesize:57 [2021-05-22 02:33:56,028 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:56,028 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995638323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:56,028 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:56,028 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:33:56,028 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865647104] [2021-05-22 02:33:56,028 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:33:56,028 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:56,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:33:56,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:33:56,029 INFO L87 Difference]: Start difference. First operand 449 states and 1400 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:57,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:57,059 INFO L93 Difference]: Finished difference Result 998 states and 3030 transitions. [2021-05-22 02:33:57,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:33:57,060 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:57,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:57,061 INFO L225 Difference]: With dead ends: 998 [2021-05-22 02:33:57,061 INFO L226 Difference]: Without dead ends: 956 [2021-05-22 02:33:57,061 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 891.9ms TimeCoverageRelationStatistics Valid=196, Invalid=796, Unknown=0, NotChecked=0, Total=992 [2021-05-22 02:33:57,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 956 states. [2021-05-22 02:33:57,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 956 to 474. [2021-05-22 02:33:57,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:57,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:33:57,067 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:33:57,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:57,068 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:33:57,068 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:57,068 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:33:57,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:57,068 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:57,068 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:57,268 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5972,1026 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:57,269 INFO L430 AbstractCegarLoop]: === Iteration 1038 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:57,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:57,269 INFO L82 PathProgramCache]: Analyzing trace with hash -182876461, now seen corresponding path program 1026 times [2021-05-22 02:33:57,269 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:57,269 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457000428] [2021-05-22 02:33:57,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:57,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:57,349 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:57,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:57,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457000428] [2021-05-22 02:33:57,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457000428] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:57,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1937412532] [2021-05-22 02:33:57,350 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1027 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1027 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:57,375 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:33:57,375 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:57,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:57,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:57,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:57,397 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:57,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:57,400 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:57,406 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:57,406 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:57,407 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:33:57,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:57,443 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:57,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:57,445 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:57,453 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:57,454 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:57,454 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:57,454 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:33:57,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:57,525 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1937412532] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:57,525 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:57,525 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:57,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496524654] [2021-05-22 02:33:57,526 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:57,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:57,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:57,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:57,526 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:58,036 INFO L93 Difference]: Finished difference Result 911 states and 2754 transitions. [2021-05-22 02:33:58,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:33:58,037 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:58,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:58,038 INFO L225 Difference]: With dead ends: 911 [2021-05-22 02:33:58,038 INFO L226 Difference]: Without dead ends: 884 [2021-05-22 02:33:58,038 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 396.4ms TimeCoverageRelationStatistics Valid=142, Invalid=508, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:33:58,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 884 states. [2021-05-22 02:33:58,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 884 to 499. [2021-05-22 02:33:58,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 3.1666666666666665) internal successors, (1577), 498 states have internal predecessors, (1577), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 1577 transitions. [2021-05-22 02:33:58,044 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 1577 transitions. Word has length 21 [2021-05-22 02:33:58,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:58,044 INFO L482 AbstractCegarLoop]: Abstraction has 499 states and 1577 transitions. [2021-05-22 02:33:58,044 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,044 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 1577 transitions. [2021-05-22 02:33:58,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:58,045 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:58,045 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:58,245 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1027 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5981 [2021-05-22 02:33:58,246 INFO L430 AbstractCegarLoop]: === Iteration 1039 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:58,246 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:58,246 INFO L82 PathProgramCache]: Analyzing trace with hash -2143623427, now seen corresponding path program 1027 times [2021-05-22 02:33:58,246 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:58,246 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1885077823] [2021-05-22 02:33:58,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:58,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:58,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:58,323 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:58,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1885077823] [2021-05-22 02:33:58,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1885077823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:58,323 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615709210] [2021-05-22 02:33:58,323 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1028 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1028 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:58,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:58,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:58,348 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:58,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:58,382 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:58,388 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:58,390 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:58,401 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:58,403 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:58,403 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:33:58,471 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:58,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:58,472 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:58,478 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:58,480 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:33:58,480 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:33:58,480 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:58,486 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:58,486 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:58,486 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:33:58,507 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:58,507 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615709210] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:58,507 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:58,507 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:58,507 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053869436] [2021-05-22 02:33:58,508 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:58,508 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:58,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:58,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:58,508 INFO L87 Difference]: Start difference. First operand 499 states and 1577 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:58,711 INFO L93 Difference]: Finished difference Result 831 states and 2540 transitions. [2021-05-22 02:33:58,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:58,711 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:58,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:58,713 INFO L225 Difference]: With dead ends: 831 [2021-05-22 02:33:58,713 INFO L226 Difference]: Without dead ends: 812 [2021-05-22 02:33:58,713 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 158.3ms TimeCoverageRelationStatistics Valid=50, Invalid=190, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:33:58,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-05-22 02:33:58,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 497. [2021-05-22 02:33:58,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 497 states, 496 states have (on average 3.1693548387096775) internal successors, (1572), 496 states have internal predecessors, (1572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 497 states to 497 states and 1572 transitions. [2021-05-22 02:33:58,719 INFO L78 Accepts]: Start accepts. Automaton has 497 states and 1572 transitions. Word has length 21 [2021-05-22 02:33:58,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:58,719 INFO L482 AbstractCegarLoop]: Abstraction has 497 states and 1572 transitions. [2021-05-22 02:33:58,719 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:58,719 INFO L276 IsEmpty]: Start isEmpty. Operand 497 states and 1572 transitions. [2021-05-22 02:33:58,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:58,720 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:58,720 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:58,920 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1028 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5991 [2021-05-22 02:33:58,920 INFO L430 AbstractCegarLoop]: === Iteration 1040 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:58,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:58,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1598250773, now seen corresponding path program 1028 times [2021-05-22 02:33:58,921 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:58,921 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033657735] [2021-05-22 02:33:58,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:58,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:58,991 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:58,991 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:58,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033657735] [2021-05-22 02:33:58,991 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033657735] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:58,991 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307616056] [2021-05-22 02:33:58,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1029 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1029 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:59,017 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:33:59,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:59,018 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:59,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:59,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:59,040 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:59,043 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,049 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:59,049 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:33:59,049 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:33:59,113 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:59,114 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,117 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:59,117 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:59,117 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,117 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:33:59,127 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:59,127 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307616056] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:59,127 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:59,127 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:33:59,127 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536566528] [2021-05-22 02:33:59,127 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:33:59,127 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:59,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:33:59,128 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:33:59,128 INFO L87 Difference]: Start difference. First operand 497 states and 1572 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:59,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:33:59,326 INFO L93 Difference]: Finished difference Result 786 states and 2383 transitions. [2021-05-22 02:33:59,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:33:59,326 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:33:59,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:33:59,327 INFO L225 Difference]: With dead ends: 786 [2021-05-22 02:33:59,327 INFO L226 Difference]: Without dead ends: 765 [2021-05-22 02:33:59,327 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 139.1ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:59,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 765 states. [2021-05-22 02:33:59,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 765 to 493. [2021-05-22 02:33:59,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 492 states have (on average 3.1686991869918697) internal successors, (1559), 492 states have internal predecessors, (1559), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:59,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 1559 transitions. [2021-05-22 02:33:59,333 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 1559 transitions. Word has length 21 [2021-05-22 02:33:59,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:33:59,334 INFO L482 AbstractCegarLoop]: Abstraction has 493 states and 1559 transitions. [2021-05-22 02:33:59,334 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:33:59,334 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 1559 transitions. [2021-05-22 02:33:59,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:33:59,334 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:33:59,334 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:33:59,544 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5995,1029 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:59,545 INFO L430 AbstractCegarLoop]: === Iteration 1041 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:33:59,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:33:59,545 INFO L82 PathProgramCache]: Analyzing trace with hash -658534101, now seen corresponding path program 1029 times [2021-05-22 02:33:59,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:33:59,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209678808] [2021-05-22 02:33:59,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:33:59,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:33:59,624 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:59,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:33:59,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209678808] [2021-05-22 02:33:59,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209678808] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:59,625 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542817841] [2021-05-22 02:33:59,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1030 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1030 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:33:59,650 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:33:59,651 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:33:59,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:33:59,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:33:59,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:33:59,685 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:33:59,687 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:59,700 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:33:59,700 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:51, output treesize:27 [2021-05-22 02:33:59,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:33:59,744 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:33:59,748 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:33:59,748 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:33:59,748 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:33:59,789 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:33:59,789 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542817841] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:33:59,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:33:59,790 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:33:59,790 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609011747] [2021-05-22 02:33:59,790 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:33:59,790 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:33:59,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:33:59,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:33:59,790 INFO L87 Difference]: Start difference. First operand 493 states and 1559 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,182 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:00,182 INFO L93 Difference]: Finished difference Result 988 states and 2997 transitions. [2021-05-22 02:34:00,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:00,183 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:00,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:00,184 INFO L225 Difference]: With dead ends: 988 [2021-05-22 02:34:00,184 INFO L226 Difference]: Without dead ends: 969 [2021-05-22 02:34:00,184 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 293.0ms TimeCoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:00,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 969 states. [2021-05-22 02:34:00,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 969 to 471. [2021-05-22 02:34:00,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.151063829787234) internal successors, (1481), 470 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1481 transitions. [2021-05-22 02:34:00,190 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1481 transitions. Word has length 21 [2021-05-22 02:34:00,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:00,190 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1481 transitions. [2021-05-22 02:34:00,190 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,190 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1481 transitions. [2021-05-22 02:34:00,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:00,191 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:00,191 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:00,391 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6001,1030 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:00,391 INFO L430 AbstractCegarLoop]: === Iteration 1042 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:00,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:00,391 INFO L82 PathProgramCache]: Analyzing trace with hash 78962131, now seen corresponding path program 1030 times [2021-05-22 02:34:00,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:00,392 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1281366614] [2021-05-22 02:34:00,392 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:00,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:00,452 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:00,452 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:00,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1281366614] [2021-05-22 02:34:00,452 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1281366614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:00,452 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [536704217] [2021-05-22 02:34:00,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1031 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1031 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:00,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:00,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:00,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:00,477 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:00,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:00,498 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:00,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:00,500 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:00,506 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:00,506 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:00,506 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:00,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:00,538 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:00,541 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:00,541 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:00,541 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:00,541 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:00,557 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:00,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [536704217] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:00,558 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:00,558 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:34:00,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445581724] [2021-05-22 02:34:00,558 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:34:00,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:00,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:34:00,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:34:00,558 INFO L87 Difference]: Start difference. First operand 471 states and 1481 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:00,734 INFO L93 Difference]: Finished difference Result 731 states and 2203 transitions. [2021-05-22 02:34:00,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:00,734 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:00,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:00,735 INFO L225 Difference]: With dead ends: 731 [2021-05-22 02:34:00,735 INFO L226 Difference]: Without dead ends: 710 [2021-05-22 02:34:00,735 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 111.7ms TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:00,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2021-05-22 02:34:00,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 439. [2021-05-22 02:34:00,740 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 439 states, 438 states have (on average 3.1141552511415527) internal successors, (1364), 438 states have internal predecessors, (1364), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 439 states to 439 states and 1364 transitions. [2021-05-22 02:34:00,740 INFO L78 Accepts]: Start accepts. Automaton has 439 states and 1364 transitions. Word has length 21 [2021-05-22 02:34:00,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:00,741 INFO L482 AbstractCegarLoop]: Abstraction has 439 states and 1364 transitions. [2021-05-22 02:34:00,741 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:00,741 INFO L276 IsEmpty]: Start isEmpty. Operand 439 states and 1364 transitions. [2021-05-22 02:34:00,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:00,741 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:00,741 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:00,941 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6005,1031 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:00,942 INFO L430 AbstractCegarLoop]: === Iteration 1043 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:00,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:00,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2076346317, now seen corresponding path program 1031 times [2021-05-22 02:34:00,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:00,942 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1378022265] [2021-05-22 02:34:00,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:00,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:01,019 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:01,020 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:01,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1378022265] [2021-05-22 02:34:01,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1378022265] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:01,020 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424977663] [2021-05-22 02:34:01,020 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1032 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1032 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:01,047 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:01,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:01,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:01,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:01,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:01,081 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,083 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:01,084 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,093 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:01,093 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:01,093 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:01,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:01,131 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,134 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:01,134 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:01,135 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,135 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:34:01,148 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:01,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424977663] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:01,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:01,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:01,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384890123] [2021-05-22 02:34:01,148 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:01,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:01,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:01,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:01,149 INFO L87 Difference]: Start difference. First operand 439 states and 1364 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:01,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:01,344 INFO L93 Difference]: Finished difference Result 541 states and 1663 transitions. [2021-05-22 02:34:01,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:01,344 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:01,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:01,345 INFO L225 Difference]: With dead ends: 541 [2021-05-22 02:34:01,345 INFO L226 Difference]: Without dead ends: 519 [2021-05-22 02:34:01,345 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 141.7ms TimeCoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:01,345 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 519 states. [2021-05-22 02:34:01,348 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 519 to 451. [2021-05-22 02:34:01,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.117777777777778) internal successors, (1403), 450 states have internal predecessors, (1403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:01,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1403 transitions. [2021-05-22 02:34:01,349 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1403 transitions. Word has length 21 [2021-05-22 02:34:01,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:01,349 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1403 transitions. [2021-05-22 02:34:01,349 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:01,350 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1403 transitions. [2021-05-22 02:34:01,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:01,350 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:01,350 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:01,550 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6011,1032 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:01,551 INFO L430 AbstractCegarLoop]: === Iteration 1044 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:01,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:01,551 INFO L82 PathProgramCache]: Analyzing trace with hash -1593296861, now seen corresponding path program 1032 times [2021-05-22 02:34:01,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:01,551 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [937071034] [2021-05-22 02:34:01,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:01,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:01,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:01,636 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:01,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [937071034] [2021-05-22 02:34:01,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [937071034] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:01,636 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415366468] [2021-05-22 02:34:01,636 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1033 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1033 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:01,666 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:01,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:01,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:01,677 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:01,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:01,709 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,714 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:01,715 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,715 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:34:01,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:01,756 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:01,758 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:01,764 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:01,765 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:01,765 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:01,765 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:34:01,813 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:01,813 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415366468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:01,813 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:01,813 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:01,813 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314224085] [2021-05-22 02:34:01,813 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:01,813 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:01,814 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:01,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:01,814 INFO L87 Difference]: Start difference. First operand 451 states and 1403 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:02,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:02,224 INFO L93 Difference]: Finished difference Result 655 states and 2004 transitions. [2021-05-22 02:34:02,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:02,225 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:02,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:02,225 INFO L225 Difference]: With dead ends: 655 [2021-05-22 02:34:02,226 INFO L226 Difference]: Without dead ends: 628 [2021-05-22 02:34:02,226 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 266.7ms TimeCoverageRelationStatistics Valid=100, Invalid=406, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:02,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2021-05-22 02:34:02,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 451. [2021-05-22 02:34:02,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 451 states, 450 states have (on average 3.1133333333333333) internal successors, (1401), 450 states have internal predecessors, (1401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:02,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 451 states to 451 states and 1401 transitions. [2021-05-22 02:34:02,230 INFO L78 Accepts]: Start accepts. Automaton has 451 states and 1401 transitions. Word has length 21 [2021-05-22 02:34:02,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:02,231 INFO L482 AbstractCegarLoop]: Abstraction has 451 states and 1401 transitions. [2021-05-22 02:34:02,231 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:02,231 INFO L276 IsEmpty]: Start isEmpty. Operand 451 states and 1401 transitions. [2021-05-22 02:34:02,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:02,231 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:02,231 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:02,431 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1033 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6014 [2021-05-22 02:34:02,432 INFO L430 AbstractCegarLoop]: === Iteration 1045 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:02,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:02,432 INFO L82 PathProgramCache]: Analyzing trace with hash -1877559545, now seen corresponding path program 1033 times [2021-05-22 02:34:02,432 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:02,432 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1368232488] [2021-05-22 02:34:02,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:02,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:02,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:02,523 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:02,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1368232488] [2021-05-22 02:34:02,523 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1368232488] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:02,523 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762347545] [2021-05-22 02:34:02,523 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1034 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1034 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:02,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:02,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:02,548 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:02,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:02,581 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:02,582 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:02,583 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:02,591 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:02,592 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:02,592 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:02,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:02,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:02,645 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:02,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:02,647 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:02,653 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:02,653 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:02,653 INFO L518 ElimStorePlain]: Eliminatee v_prenex_304 vanished before elimination [2021-05-22 02:34:02,654 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:02,654 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:34:02,700 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:02,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762347545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:02,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:02,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:02,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249305565] [2021-05-22 02:34:02,701 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:02,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:02,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:02,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:02,701 INFO L87 Difference]: Start difference. First operand 451 states and 1401 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:03,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:03,154 INFO L93 Difference]: Finished difference Result 772 states and 2358 transitions. [2021-05-22 02:34:03,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:34:03,154 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:03,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:03,155 INFO L225 Difference]: With dead ends: 772 [2021-05-22 02:34:03,155 INFO L226 Difference]: Without dead ends: 745 [2021-05-22 02:34:03,155 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 340.9ms TimeCoverageRelationStatistics Valid=112, Invalid=488, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:03,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 745 states. [2021-05-22 02:34:03,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 745 to 467. [2021-05-22 02:34:03,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.11587982832618) internal successors, (1452), 466 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:03,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1452 transitions. [2021-05-22 02:34:03,161 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1452 transitions. Word has length 21 [2021-05-22 02:34:03,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:03,161 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1452 transitions. [2021-05-22 02:34:03,161 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:03,161 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1452 transitions. [2021-05-22 02:34:03,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:03,161 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:03,161 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:03,362 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6017,1034 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:03,362 INFO L430 AbstractCegarLoop]: === Iteration 1046 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:03,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:03,362 INFO L82 PathProgramCache]: Analyzing trace with hash -191167705, now seen corresponding path program 1034 times [2021-05-22 02:34:03,362 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:03,362 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839798086] [2021-05-22 02:34:03,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:03,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:03,456 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:03,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:03,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839798086] [2021-05-22 02:34:03,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839798086] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:03,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190360636] [2021-05-22 02:34:03,456 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1035 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1035 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:03,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:03,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:03,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:03,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:03,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:03,522 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:03,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:03,524 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:03,533 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:03,533 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:03,533 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:03,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:03,588 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:03,591 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:03,591 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:03,591 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:03,591 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:03,619 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:03,619 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190360636] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:03,619 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:03,619 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:03,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725300710] [2021-05-22 02:34:03,619 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:03,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:03,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:03,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:03,619 INFO L87 Difference]: Start difference. First operand 467 states and 1452 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:04,022 INFO L93 Difference]: Finished difference Result 700 states and 2141 transitions. [2021-05-22 02:34:04,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:04,023 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:04,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:04,023 INFO L225 Difference]: With dead ends: 700 [2021-05-22 02:34:04,024 INFO L226 Difference]: Without dead ends: 679 [2021-05-22 02:34:04,024 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 346.7ms TimeCoverageRelationStatistics Valid=105, Invalid=447, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:04,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-22 02:34:04,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 468. [2021-05-22 02:34:04,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1241970021413277) internal successors, (1459), 467 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1459 transitions. [2021-05-22 02:34:04,029 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1459 transitions. Word has length 21 [2021-05-22 02:34:04,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:04,029 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1459 transitions. [2021-05-22 02:34:04,029 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,029 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1459 transitions. [2021-05-22 02:34:04,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:04,030 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:04,030 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:04,230 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6028,1035 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:04,230 INFO L430 AbstractCegarLoop]: === Iteration 1047 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:04,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:04,230 INFO L82 PathProgramCache]: Analyzing trace with hash -168663333, now seen corresponding path program 1035 times [2021-05-22 02:34:04,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:04,230 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055749113] [2021-05-22 02:34:04,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:04,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:04,304 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:04,304 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:04,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055749113] [2021-05-22 02:34:04,304 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055749113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:04,304 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1307130574] [2021-05-22 02:34:04,304 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1036 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1036 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:04,330 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:04,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:04,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:04,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:04,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:04,372 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:04,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:04,375 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:04,383 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:04,384 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:04,384 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:04,409 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:04,410 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:04,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:04,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:04,423 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:04,431 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:04,431 INFO L518 ElimStorePlain]: Eliminatee v_prenex_307 vanished before elimination [2021-05-22 02:34:04,431 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:04,432 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:04,432 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:04,465 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:04,465 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1307130574] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:04,465 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:04,465 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:04,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748177716] [2021-05-22 02:34:04,465 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:04,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:04,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:04,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:04,466 INFO L87 Difference]: Start difference. First operand 468 states and 1459 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,670 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:04,671 INFO L93 Difference]: Finished difference Result 605 states and 1866 transitions. [2021-05-22 02:34:04,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:04,671 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:04,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:04,672 INFO L225 Difference]: With dead ends: 605 [2021-05-22 02:34:04,672 INFO L226 Difference]: Without dead ends: 576 [2021-05-22 02:34:04,672 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:04,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-22 02:34:04,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 468. [2021-05-22 02:34:04,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1241970021413277) internal successors, (1459), 467 states have internal predecessors, (1459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1459 transitions. [2021-05-22 02:34:04,677 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1459 transitions. Word has length 21 [2021-05-22 02:34:04,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:04,677 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1459 transitions. [2021-05-22 02:34:04,677 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:04,677 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1459 transitions. [2021-05-22 02:34:04,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:04,677 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:04,678 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:04,878 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1036 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6034 [2021-05-22 02:34:04,878 INFO L430 AbstractCegarLoop]: === Iteration 1048 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:04,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:04,878 INFO L82 PathProgramCache]: Analyzing trace with hash 128603077, now seen corresponding path program 1036 times [2021-05-22 02:34:04,878 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:04,878 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [311195473] [2021-05-22 02:34:04,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:04,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:04,959 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:04,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:04,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [311195473] [2021-05-22 02:34:04,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [311195473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:04,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1367400435] [2021-05-22 02:34:04,959 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1037 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1037 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:04,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:04,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:04,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:04,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:05,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:05,019 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:05,023 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:05,024 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:05,024 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:34:05,045 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:05,045 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:05,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:05,048 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:05,056 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:05,056 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:05,056 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:05,056 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:34:05,125 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:05,125 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1367400435] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:05,125 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:05,125 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:05,125 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227177146] [2021-05-22 02:34:05,125 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:05,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:05,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:05,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:05,126 INFO L87 Difference]: Start difference. First operand 468 states and 1459 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:05,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:05,646 INFO L93 Difference]: Finished difference Result 680 states and 2083 transitions. [2021-05-22 02:34:05,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:34:05,646 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:05,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:05,647 INFO L225 Difference]: With dead ends: 680 [2021-05-22 02:34:05,647 INFO L226 Difference]: Without dead ends: 657 [2021-05-22 02:34:05,648 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 382.6ms TimeCoverageRelationStatistics Valid=129, Invalid=521, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:34:05,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 657 states. [2021-05-22 02:34:05,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 657 to 467. [2021-05-22 02:34:05,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.133047210300429) internal successors, (1460), 466 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:05,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1460 transitions. [2021-05-22 02:34:05,653 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1460 transitions. Word has length 21 [2021-05-22 02:34:05,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:05,653 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1460 transitions. [2021-05-22 02:34:05,653 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:05,653 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1460 transitions. [2021-05-22 02:34:05,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:05,654 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:05,654 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:05,854 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6039,1037 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:05,854 INFO L430 AbstractCegarLoop]: === Iteration 1049 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:05,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:05,854 INFO L82 PathProgramCache]: Analyzing trace with hash -155659607, now seen corresponding path program 1037 times [2021-05-22 02:34:05,854 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:05,854 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1063577706] [2021-05-22 02:34:05,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:05,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:05,952 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:05,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:05,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1063577706] [2021-05-22 02:34:05,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1063577706] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:05,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711697653] [2021-05-22 02:34:05,953 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1038 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1038 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:05,984 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:05,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:05,984 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:05,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:06,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:06,018 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:06,021 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:06,024 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:06,027 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,052 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:06,053 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:34:06,053 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:101, output treesize:69 [2021-05-22 02:34:06,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:06,101 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,131 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:06,131 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:06,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:06,134 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,162 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:06,162 INFO L518 ElimStorePlain]: Eliminatee v_prenex_309 vanished before elimination [2021-05-22 02:34:06,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:06,165 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,191 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:06,192 INFO L518 ElimStorePlain]: Eliminatee v_prenex_311 vanished before elimination [2021-05-22 02:34:06,194 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:06,195 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:06,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:06,219 INFO L518 ElimStorePlain]: Eliminatee v_prenex_313 vanished before elimination [2021-05-22 02:34:06,220 INFO L550 ElimStorePlain]: Start of recursive call 1: 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:34:06,220 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 8 variables, input treesize:105, output treesize:57 [2021-05-22 02:34:06,333 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:06,333 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711697653] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:06,333 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:06,333 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:06,333 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466288721] [2021-05-22 02:34:06,334 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:06,334 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:06,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:06,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:06,334 INFO L87 Difference]: Start difference. First operand 467 states and 1460 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:07,060 INFO L93 Difference]: Finished difference Result 874 states and 2647 transitions. [2021-05-22 02:34:07,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-22 02:34:07,060 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:07,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:07,061 INFO L225 Difference]: With dead ends: 874 [2021-05-22 02:34:07,061 INFO L226 Difference]: Without dead ends: 826 [2021-05-22 02:34:07,061 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 155 ImplicationChecksByTransitivity, 683.6ms TimeCoverageRelationStatistics Valid=158, Invalid=654, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:34:07,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 826 states. [2021-05-22 02:34:07,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 826 to 470. [2021-05-22 02:34:07,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.142857142857143) internal successors, (1474), 469 states have internal predecessors, (1474), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1474 transitions. [2021-05-22 02:34:07,072 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1474 transitions. Word has length 21 [2021-05-22 02:34:07,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:07,072 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1474 transitions. [2021-05-22 02:34:07,072 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,072 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1474 transitions. [2021-05-22 02:34:07,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:07,073 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:07,073 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:07,273 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1038 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6045 [2021-05-22 02:34:07,273 INFO L430 AbstractCegarLoop]: === Iteration 1050 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:07,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:07,274 INFO L82 PathProgramCache]: Analyzing trace with hash 1920030183, now seen corresponding path program 1038 times [2021-05-22 02:34:07,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:07,274 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1738476232] [2021-05-22 02:34:07,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:07,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:07,358 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:07,358 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:07,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1738476232] [2021-05-22 02:34:07,358 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1738476232] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:07,358 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1421774472] [2021-05-22 02:34:07,358 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1039 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1039 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:07,383 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:07,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:07,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:07,384 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:07,464 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_314], 1=[o_4]} [2021-05-22 02:34:07,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:07,467 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:07,481 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:07,483 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:07,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:07,484 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:07,496 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:07,498 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:34:07,498 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:55, output treesize:39 [2021-05-22 02:34:07,552 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:07,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:07,553 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:07,561 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:07,563 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:07,564 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:34:07,564 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:07,572 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:07,573 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:07,573 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:34:07,593 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:07,594 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1421774472] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:07,594 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:07,594 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:07,594 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148893030] [2021-05-22 02:34:07,594 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:07,594 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:07,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:07,594 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:07,594 INFO L87 Difference]: Start difference. First operand 470 states and 1474 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:07,831 INFO L93 Difference]: Finished difference Result 603 states and 1852 transitions. [2021-05-22 02:34:07,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:07,831 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:07,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:07,832 INFO L225 Difference]: With dead ends: 603 [2021-05-22 02:34:07,832 INFO L226 Difference]: Without dead ends: 582 [2021-05-22 02:34:07,832 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 236.4ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:07,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2021-05-22 02:34:07,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 466. [2021-05-22 02:34:07,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1333333333333333) internal successors, (1457), 465 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1457 transitions. [2021-05-22 02:34:07,837 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1457 transitions. Word has length 21 [2021-05-22 02:34:07,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:07,837 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1457 transitions. [2021-05-22 02:34:07,837 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:07,837 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1457 transitions. [2021-05-22 02:34:07,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:07,838 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:07,838 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:08,038 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6057,1039 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:08,038 INFO L430 AbstractCegarLoop]: === Iteration 1051 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:08,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:08,038 INFO L82 PathProgramCache]: Analyzing trace with hash 1528581611, now seen corresponding path program 1039 times [2021-05-22 02:34:08,038 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:08,039 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1582457953] [2021-05-22 02:34:08,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:08,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:08,115 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:08,115 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:08,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1582457953] [2021-05-22 02:34:08,115 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1582457953] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:08,115 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1095959823] [2021-05-22 02:34:08,115 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1040 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1040 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:08,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:08,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:08,141 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:08,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:08,171 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,175 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:08,176 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,176 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:34:08,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:34:08,198 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:34:08,200 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,208 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:08,208 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:08,209 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:08,209 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:08,242 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:08,242 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1095959823] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:08,242 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:08,242 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:08,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454954674] [2021-05-22 02:34:08,242 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:08,242 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:08,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:08,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:08,243 INFO L87 Difference]: Start difference. First operand 466 states and 1457 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:08,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:08,400 INFO L93 Difference]: Finished difference Result 579 states and 1787 transitions. [2021-05-22 02:34:08,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:08,401 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:08,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:08,401 INFO L225 Difference]: With dead ends: 579 [2021-05-22 02:34:08,401 INFO L226 Difference]: Without dead ends: 543 [2021-05-22 02:34:08,401 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 111.6ms TimeCoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:08,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 543 states. [2021-05-22 02:34:08,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 543 to 467. [2021-05-22 02:34:08,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1373390557939915) internal successors, (1462), 466 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:08,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1462 transitions. [2021-05-22 02:34:08,406 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1462 transitions. Word has length 21 [2021-05-22 02:34:08,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:08,406 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1462 transitions. [2021-05-22 02:34:08,406 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:08,406 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1462 transitions. [2021-05-22 02:34:08,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:08,407 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:08,407 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:08,607 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6062,1040 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:08,607 INFO L430 AbstractCegarLoop]: === Iteration 1052 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:08,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:08,608 INFO L82 PathProgramCache]: Analyzing trace with hash 1825848021, now seen corresponding path program 1040 times [2021-05-22 02:34:08,608 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:08,608 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [355283344] [2021-05-22 02:34:08,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:08,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:08,694 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:08,694 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:08,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [355283344] [2021-05-22 02:34:08,694 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [355283344] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:08,694 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [517538874] [2021-05-22 02:34:08,694 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1041 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1041 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:08,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:08,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:08,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:08,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:08,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:08,763 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:08,765 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,773 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:08,774 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:08,774 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:08,799 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:08,800 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,810 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:08,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:08,812 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:08,821 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:08,821 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:08,821 INFO L518 ElimStorePlain]: Eliminatee v_prenex_315 vanished before elimination [2021-05-22 02:34:08,821 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:08,821 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:08,890 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:08,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [517538874] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:08,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:08,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:08,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1159682358] [2021-05-22 02:34:08,891 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:08,891 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:08,891 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:08,891 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:08,891 INFO L87 Difference]: Start difference. First operand 467 states and 1462 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:09,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:09,322 INFO L93 Difference]: Finished difference Result 693 states and 2124 transitions. [2021-05-22 02:34:09,322 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:09,322 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:09,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:09,323 INFO L225 Difference]: With dead ends: 693 [2021-05-22 02:34:09,323 INFO L226 Difference]: Without dead ends: 670 [2021-05-22 02:34:09,323 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 364.8ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:09,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 670 states. [2021-05-22 02:34:09,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 670 to 482. [2021-05-22 02:34:09,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1538461538461537) internal successors, (1517), 481 states have internal predecessors, (1517), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:09,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1517 transitions. [2021-05-22 02:34:09,328 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1517 transitions. Word has length 21 [2021-05-22 02:34:09,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:09,328 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1517 transitions. [2021-05-22 02:34:09,328 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:09,328 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1517 transitions. [2021-05-22 02:34:09,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:09,329 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:09,329 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:09,529 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1041 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6065 [2021-05-22 02:34:09,529 INFO L430 AbstractCegarLoop]: === Iteration 1053 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:09,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:09,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1541585337, now seen corresponding path program 1041 times [2021-05-22 02:34:09,530 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:09,530 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709419396] [2021-05-22 02:34:09,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:09,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:09,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:09,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:09,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709419396] [2021-05-22 02:34:09,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709419396] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:09,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [902935790] [2021-05-22 02:34:09,621 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1042 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1042 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:09,647 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:09,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:09,647 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:09,648 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:09,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:09,681 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:09,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:09,684 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:09,693 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:09,693 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:09,693 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:09,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:09,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:09,730 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:09,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:09,733 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:09,741 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:09,741 INFO L518 ElimStorePlain]: Eliminatee v_prenex_318 vanished before elimination [2021-05-22 02:34:09,741 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:09,742 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:09,742 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:09,815 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:09,815 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [902935790] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:09,815 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:09,815 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:09,815 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002916828] [2021-05-22 02:34:09,815 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:09,815 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:09,816 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:09,816 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:09,816 INFO L87 Difference]: Start difference. First operand 482 states and 1517 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:10,230 INFO L93 Difference]: Finished difference Result 725 states and 2232 transitions. [2021-05-22 02:34:10,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:10,231 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:10,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:10,232 INFO L225 Difference]: With dead ends: 725 [2021-05-22 02:34:10,232 INFO L226 Difference]: Without dead ends: 698 [2021-05-22 02:34:10,232 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 313.3ms TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:10,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 698 states. [2021-05-22 02:34:10,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 698 to 488. [2021-05-22 02:34:10,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.1519507186858315) internal successors, (1535), 487 states have internal predecessors, (1535), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1535 transitions. [2021-05-22 02:34:10,237 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1535 transitions. Word has length 21 [2021-05-22 02:34:10,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:10,237 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1535 transitions. [2021-05-22 02:34:10,238 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,238 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1535 transitions. [2021-05-22 02:34:10,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:10,238 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:10,238 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:10,438 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6073,1042 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:10,439 INFO L430 AbstractCegarLoop]: === Iteration 1054 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:10,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:10,439 INFO L82 PathProgramCache]: Analyzing trace with hash -419161629, now seen corresponding path program 1042 times [2021-05-22 02:34:10,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:10,439 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416060667] [2021-05-22 02:34:10,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:10,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:10,513 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:10,513 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:10,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416060667] [2021-05-22 02:34:10,513 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416060667] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:10,513 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1878560729] [2021-05-22 02:34:10,513 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1043 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1043 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:10,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:10,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:10,539 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:10,539 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:10,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:10,572 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:10,574 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:10,574 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:10,583 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:10,583 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:10,583 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:10,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:10,617 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:10,621 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:10,621 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:10,621 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:10,621 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:10,636 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:10,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1878560729] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:10,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:10,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:10,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858868640] [2021-05-22 02:34:10,636 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:10,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:10,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:10,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:10,637 INFO L87 Difference]: Start difference. First operand 488 states and 1535 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:10,783 INFO L93 Difference]: Finished difference Result 585 states and 1805 transitions. [2021-05-22 02:34:10,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:10,783 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:10,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:10,784 INFO L225 Difference]: With dead ends: 585 [2021-05-22 02:34:10,784 INFO L226 Difference]: Without dead ends: 566 [2021-05-22 02:34:10,784 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 109.2ms TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:10,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 566 states. [2021-05-22 02:34:10,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 566 to 472. [2021-05-22 02:34:10,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1443736730360934) internal successors, (1481), 471 states have internal predecessors, (1481), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1481 transitions. [2021-05-22 02:34:10,789 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1481 transitions. Word has length 21 [2021-05-22 02:34:10,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:10,789 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1481 transitions. [2021-05-22 02:34:10,789 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:10,789 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1481 transitions. [2021-05-22 02:34:10,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:10,789 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:10,789 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:10,990 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1043 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6084 [2021-05-22 02:34:10,990 INFO L430 AbstractCegarLoop]: === Iteration 1055 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:10,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:10,990 INFO L82 PathProgramCache]: Analyzing trace with hash 126211025, now seen corresponding path program 1043 times [2021-05-22 02:34:10,990 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:10,990 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1347613120] [2021-05-22 02:34:10,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:10,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:11,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:11,070 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:11,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1347613120] [2021-05-22 02:34:11,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1347613120] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:11,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075531019] [2021-05-22 02:34:11,070 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1044 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1044 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:11,095 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:11,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:11,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:11,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:11,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:11,128 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,130 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:11,131 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,139 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:11,140 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:11,140 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:11,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:11,195 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,198 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:11,198 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:11,198 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,198 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:11,208 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:11,208 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075531019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:11,208 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:11,208 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:11,208 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637049607] [2021-05-22 02:34:11,208 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:11,208 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:11,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:11,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:11,208 INFO L87 Difference]: Start difference. First operand 472 states and 1481 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:11,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:11,381 INFO L93 Difference]: Finished difference Result 615 states and 1889 transitions. [2021-05-22 02:34:11,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:11,381 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:11,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:11,382 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:34:11,382 INFO L226 Difference]: Without dead ends: 594 [2021-05-22 02:34:11,382 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 142.4ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:11,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-05-22 02:34:11,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 472. [2021-05-22 02:34:11,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 472 states, 471 states have (on average 3.1528662420382165) internal successors, (1485), 471 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:11,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 472 states to 472 states and 1485 transitions. [2021-05-22 02:34:11,388 INFO L78 Accepts]: Start accepts. Automaton has 472 states and 1485 transitions. Word has length 21 [2021-05-22 02:34:11,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:11,388 INFO L482 AbstractCegarLoop]: Abstraction has 472 states and 1485 transitions. [2021-05-22 02:34:11,388 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:11,388 INFO L276 IsEmpty]: Start isEmpty. Operand 472 states and 1485 transitions. [2021-05-22 02:34:11,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:11,388 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:11,388 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:11,589 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6087,1044 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:11,589 INFO L430 AbstractCegarLoop]: === Iteration 1056 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:11,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:11,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1592773657, now seen corresponding path program 1044 times [2021-05-22 02:34:11,589 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:11,589 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [777280996] [2021-05-22 02:34:11,589 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:11,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:11,683 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:11,683 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:11,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [777280996] [2021-05-22 02:34:11,683 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [777280996] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:11,683 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231688612] [2021-05-22 02:34:11,683 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1045 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1045 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:11,709 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:34:11,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:11,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:11,710 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:11,758 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:11,759 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:11,762 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,776 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:11,777 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 2 xjuncts. [2021-05-22 02:34:11,778 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:57, output treesize:33 [2021-05-22 02:34:11,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:11,825 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:11,826 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,832 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:11,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:11,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:34:11,834 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,840 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:11,840 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:11,840 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:34:11,855 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:11,855 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231688612] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:11,855 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:11,855 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:11,855 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [361130143] [2021-05-22 02:34:11,855 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:11,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:11,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:11,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:11,855 INFO L87 Difference]: Start difference. First operand 472 states and 1485 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:12,012 INFO L93 Difference]: Finished difference Result 615 states and 1889 transitions. [2021-05-22 02:34:12,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:12,012 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:12,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:12,013 INFO L225 Difference]: With dead ends: 615 [2021-05-22 02:34:12,013 INFO L226 Difference]: Without dead ends: 594 [2021-05-22 02:34:12,013 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 146.8ms TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:12,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 594 states. [2021-05-22 02:34:12,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 594 to 468. [2021-05-22 02:34:12,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.143468950749465) internal successors, (1468), 467 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1468 transitions. [2021-05-22 02:34:12,018 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1468 transitions. Word has length 21 [2021-05-22 02:34:12,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:12,018 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1468 transitions. [2021-05-22 02:34:12,018 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,018 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1468 transitions. [2021-05-22 02:34:12,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:12,019 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:12,019 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:12,219 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6093,1045 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:12,219 INFO L430 AbstractCegarLoop]: === Iteration 1057 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:12,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:12,220 INFO L82 PathProgramCache]: Analyzing trace with hash -196386479, now seen corresponding path program 1045 times [2021-05-22 02:34:12,220 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:12,220 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558067468] [2021-05-22 02:34:12,220 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:12,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:12,310 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:12,310 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:12,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558067468] [2021-05-22 02:34:12,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558067468] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:12,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106871341] [2021-05-22 02:34:12,310 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1046 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1046 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:12,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:12,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:12,336 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:12,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:12,380 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:12,383 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:12,384 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:12,384 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:12,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:12,413 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:12,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:12,416 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:12,416 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:12,416 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:12,444 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:12,444 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106871341] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:12,444 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:12,444 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:12,444 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522757013] [2021-05-22 02:34:12,444 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:12,444 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:12,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:12,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:12,445 INFO L87 Difference]: Start difference. First operand 468 states and 1468 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:12,815 INFO L93 Difference]: Finished difference Result 714 states and 2192 transitions. [2021-05-22 02:34:12,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:12,816 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:12,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:12,817 INFO L225 Difference]: With dead ends: 714 [2021-05-22 02:34:12,817 INFO L226 Difference]: Without dead ends: 693 [2021-05-22 02:34:12,817 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 280.5ms TimeCoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:12,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 693 states. [2021-05-22 02:34:12,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 693 to 474. [2021-05-22 02:34:12,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 474 states, 473 states have (on average 3.1479915433403804) internal successors, (1489), 473 states have internal predecessors, (1489), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 474 states to 474 states and 1489 transitions. [2021-05-22 02:34:12,822 INFO L78 Accepts]: Start accepts. Automaton has 474 states and 1489 transitions. Word has length 21 [2021-05-22 02:34:12,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:12,822 INFO L482 AbstractCegarLoop]: Abstraction has 474 states and 1489 transitions. [2021-05-22 02:34:12,822 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:12,822 INFO L276 IsEmpty]: Start isEmpty. Operand 474 states and 1489 transitions. [2021-05-22 02:34:12,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:12,822 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:12,822 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:13,023 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1046 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6097 [2021-05-22 02:34:13,023 INFO L430 AbstractCegarLoop]: === Iteration 1058 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:13,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:13,023 INFO L82 PathProgramCache]: Analyzing trace with hash -1526314641, now seen corresponding path program 1046 times [2021-05-22 02:34:13,023 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:13,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [707182329] [2021-05-22 02:34:13,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:13,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:13,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:13,101 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:13,101 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [707182329] [2021-05-22 02:34:13,101 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [707182329] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:13,102 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781756069] [2021-05-22 02:34:13,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1047 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1047 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:13,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:13,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:13,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:13,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:13,225 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:13,226 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:13,227 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,233 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,234 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:34:13,234 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:34, output treesize:27 [2021-05-22 02:34:13,259 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:13,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:13,260 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,268 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,269 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:13,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:34:13,270 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,278 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,279 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,279 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:41, output treesize:10 [2021-05-22 02:34:13,298 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:13,298 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [781756069] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:13,298 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:13,298 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:13,299 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454964338] [2021-05-22 02:34:13,299 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:13,299 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:13,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:13,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:13,299 INFO L87 Difference]: Start difference. First operand 474 states and 1489 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:13,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:13,469 INFO L93 Difference]: Finished difference Result 602 states and 1859 transitions. [2021-05-22 02:34:13,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:13,469 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:13,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:13,470 INFO L225 Difference]: With dead ends: 602 [2021-05-22 02:34:13,470 INFO L226 Difference]: Without dead ends: 581 [2021-05-22 02:34:13,470 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 176.5ms TimeCoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:13,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 581 states. [2021-05-22 02:34:13,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 581 to 471. [2021-05-22 02:34:13,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1425531914893616) internal successors, (1477), 470 states have internal predecessors, (1477), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:13,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1477 transitions. [2021-05-22 02:34:13,476 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1477 transitions. Word has length 21 [2021-05-22 02:34:13,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:13,476 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1477 transitions. [2021-05-22 02:34:13,476 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:13,476 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1477 transitions. [2021-05-22 02:34:13,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:13,476 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:13,476 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:13,677 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6099,1047 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:13,677 INFO L430 AbstractCegarLoop]: === Iteration 1059 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:13,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:13,677 INFO L82 PathProgramCache]: Analyzing trace with hash 1853571167, now seen corresponding path program 1047 times [2021-05-22 02:34:13,677 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:13,677 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [67506819] [2021-05-22 02:34:13,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:13,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:13,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:13,769 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:13,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [67506819] [2021-05-22 02:34:13,769 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [67506819] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:13,769 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826380664] [2021-05-22 02:34:13,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1048 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1048 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:13,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:13,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:13,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:13,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:13,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:13,855 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,860 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,861 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 1 dim-0 vars, and 1 xjuncts. [2021-05-22 02:34:13,861 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:31, output treesize:24 [2021-05-22 02:34:13,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:13,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:13,884 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,890 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,892 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:34:13,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 3 [2021-05-22 02:34:13,893 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,898 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:13,899 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:13,899 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:33, output treesize:10 [2021-05-22 02:34:13,943 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:13,943 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826380664] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:13,943 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:13,943 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:13,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294645818] [2021-05-22 02:34:13,943 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:13,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:13,944 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:13,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:13,944 INFO L87 Difference]: Start difference. First operand 471 states and 1477 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:14,260 INFO L93 Difference]: Finished difference Result 690 states and 2124 transitions. [2021-05-22 02:34:14,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:14,261 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:14,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:14,262 INFO L225 Difference]: With dead ends: 690 [2021-05-22 02:34:14,262 INFO L226 Difference]: Without dead ends: 669 [2021-05-22 02:34:14,262 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 258.9ms TimeCoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:14,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 669 states. [2021-05-22 02:34:14,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 669 to 467. [2021-05-22 02:34:14,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1416309012875536) internal successors, (1464), 466 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1464 transitions. [2021-05-22 02:34:14,267 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1464 transitions. Word has length 21 [2021-05-22 02:34:14,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:14,267 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1464 transitions. [2021-05-22 02:34:14,267 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,267 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1464 transitions. [2021-05-22 02:34:14,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:14,268 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:14,268 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:14,468 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1048 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6102 [2021-05-22 02:34:14,468 INFO L430 AbstractCegarLoop]: === Iteration 1060 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:14,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:14,468 INFO L82 PathProgramCache]: Analyzing trace with hash 321710461, now seen corresponding path program 1048 times [2021-05-22 02:34:14,468 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:14,469 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [439053908] [2021-05-22 02:34:14,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:14,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:14,544 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:14,545 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:14,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [439053908] [2021-05-22 02:34:14,545 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [439053908] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:14,545 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2113636937] [2021-05-22 02:34:14,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1049 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1049 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:14,569 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:14,570 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:14,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:14,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:14,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:14,595 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:14,598 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:14,599 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:14,599 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:34:14,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:34:14,620 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:14,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:34:14,623 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:14,631 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:14,631 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:14,631 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:14,631 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:14,663 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:14,663 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2113636937] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:14,663 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:14,663 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:34:14,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527073098] [2021-05-22 02:34:14,663 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:34:14,663 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:14,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:34:14,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:34:14,664 INFO L87 Difference]: Start difference. First operand 467 states and 1464 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:14,847 INFO L93 Difference]: Finished difference Result 634 states and 1955 transitions. [2021-05-22 02:34:14,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:14,847 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:14,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:14,848 INFO L225 Difference]: With dead ends: 634 [2021-05-22 02:34:14,848 INFO L226 Difference]: Without dead ends: 587 [2021-05-22 02:34:14,848 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 131.5ms TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:14,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2021-05-22 02:34:14,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 475. [2021-05-22 02:34:14,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 475 states, 474 states have (on average 3.147679324894515) internal successors, (1492), 474 states have internal predecessors, (1492), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 475 states to 475 states and 1492 transitions. [2021-05-22 02:34:14,853 INFO L78 Accepts]: Start accepts. Automaton has 475 states and 1492 transitions. Word has length 21 [2021-05-22 02:34:14,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:14,853 INFO L482 AbstractCegarLoop]: Abstraction has 475 states and 1492 transitions. [2021-05-22 02:34:14,853 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:14,853 INFO L276 IsEmpty]: Start isEmpty. Operand 475 states and 1492 transitions. [2021-05-22 02:34:14,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:14,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:14,854 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:15,054 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6104,1049 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:15,054 INFO L430 AbstractCegarLoop]: === Iteration 1061 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:15,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:15,054 INFO L82 PathProgramCache]: Analyzing trace with hash 618976871, now seen corresponding path program 1049 times [2021-05-22 02:34:15,054 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:15,054 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317075835] [2021-05-22 02:34:15,054 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:15,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:15,134 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:15,134 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:15,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317075835] [2021-05-22 02:34:15,134 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317075835] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:15,134 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382587339] [2021-05-22 02:34:15,134 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1050 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1050 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:15,159 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:34:15,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:15,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:15,160 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:15,180 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:15,181 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:15,183 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,189 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:15,190 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:15,190 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:15,225 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:15,226 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:15,229 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:15,231 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:15,234 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:15,258 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:15,258 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:15,259 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:34:15,259 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:105, output treesize:57 [2021-05-22 02:34:15,367 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:15,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382587339] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:15,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:15,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:15,367 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [781373505] [2021-05-22 02:34:15,367 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:15,367 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:15,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:15,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:15,368 INFO L87 Difference]: Start difference. First operand 475 states and 1492 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:15,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:15,855 INFO L93 Difference]: Finished difference Result 756 states and 2307 transitions. [2021-05-22 02:34:15,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:34:15,856 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:15,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:15,856 INFO L225 Difference]: With dead ends: 756 [2021-05-22 02:34:15,856 INFO L226 Difference]: Without dead ends: 733 [2021-05-22 02:34:15,857 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 483.1ms TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:34:15,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 733 states. [2021-05-22 02:34:15,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 733 to 500. [2021-05-22 02:34:15,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 500 states, 499 states have (on average 3.1683366733466936) internal successors, (1581), 499 states have internal predecessors, (1581), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:15,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 500 states to 500 states and 1581 transitions. [2021-05-22 02:34:15,862 INFO L78 Accepts]: Start accepts. Automaton has 500 states and 1581 transitions. Word has length 21 [2021-05-22 02:34:15,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:15,862 INFO L482 AbstractCegarLoop]: Abstraction has 500 states and 1581 transitions. [2021-05-22 02:34:15,862 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:15,862 INFO L276 IsEmpty]: Start isEmpty. Operand 500 states and 1581 transitions. [2021-05-22 02:34:15,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:15,863 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:15,863 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:16,063 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6107,1050 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:16,063 INFO L430 AbstractCegarLoop]: === Iteration 1062 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:16,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:16,063 INFO L82 PathProgramCache]: Analyzing trace with hash 334714187, now seen corresponding path program 1050 times [2021-05-22 02:34:16,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:16,063 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1848760300] [2021-05-22 02:34:16,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:16,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:16,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:16,147 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:16,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1848760300] [2021-05-22 02:34:16,147 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1848760300] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:16,147 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1938442264] [2021-05-22 02:34:16,147 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1051 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1051 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:16,174 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:34:16,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:16,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:16,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:16,193 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:16,194 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:16,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:16,197 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:16,203 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:16,203 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:16,203 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:16,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:16,239 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:16,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:16,242 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:16,250 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:16,250 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:16,250 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:16,250 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:16,323 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:16,323 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1938442264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:16,323 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:16,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:16,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [578554139] [2021-05-22 02:34:16,323 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:16,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:16,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:16,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:16,323 INFO L87 Difference]: Start difference. First operand 500 states and 1581 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:16,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:16,744 INFO L93 Difference]: Finished difference Result 872 states and 2679 transitions. [2021-05-22 02:34:16,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:16,744 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:16,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:16,745 INFO L225 Difference]: With dead ends: 872 [2021-05-22 02:34:16,745 INFO L226 Difference]: Without dead ends: 845 [2021-05-22 02:34:16,746 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 351.7ms TimeCoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:16,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 845 states. [2021-05-22 02:34:16,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 845 to 513. [2021-05-22 02:34:16,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 3.177734375) internal successors, (1627), 512 states have internal predecessors, (1627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:16,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 1627 transitions. [2021-05-22 02:34:16,752 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 1627 transitions. Word has length 21 [2021-05-22 02:34:16,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:16,752 INFO L482 AbstractCegarLoop]: Abstraction has 513 states and 1627 transitions. [2021-05-22 02:34:16,752 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:16,752 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 1627 transitions. [2021-05-22 02:34:16,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:16,753 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:16,753 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:16,953 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6115,1051 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:16,953 INFO L430 AbstractCegarLoop]: === Iteration 1063 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:16,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:16,954 INFO L82 PathProgramCache]: Analyzing trace with hash -1626032779, now seen corresponding path program 1051 times [2021-05-22 02:34:16,954 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:16,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1877091326] [2021-05-22 02:34:16,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:16,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:17,027 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:17,027 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:17,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1877091326] [2021-05-22 02:34:17,027 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1877091326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:17,027 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1016519977] [2021-05-22 02:34:17,027 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1052 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1052 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:17,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:17,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:17,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:17,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:17,074 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,075 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:17,076 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,082 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:17,082 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:17,082 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:17,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:17,129 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,132 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:17,133 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:17,133 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,133 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:17,147 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:17,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1016519977] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:17,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:17,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:17,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776537497] [2021-05-22 02:34:17,148 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:17,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:17,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:17,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:17,148 INFO L87 Difference]: Start difference. First operand 513 states and 1627 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:17,285 INFO L93 Difference]: Finished difference Result 750 states and 2308 transitions. [2021-05-22 02:34:17,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:17,285 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:17,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:17,286 INFO L225 Difference]: With dead ends: 750 [2021-05-22 02:34:17,287 INFO L226 Difference]: Without dead ends: 731 [2021-05-22 02:34:17,287 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 125.7ms TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:17,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 731 states. [2021-05-22 02:34:17,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 731 to 511. [2021-05-22 02:34:17,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 511 states, 510 states have (on average 3.180392156862745) internal successors, (1622), 510 states have internal predecessors, (1622), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 511 states to 511 states and 1622 transitions. [2021-05-22 02:34:17,297 INFO L78 Accepts]: Start accepts. Automaton has 511 states and 1622 transitions. Word has length 21 [2021-05-22 02:34:17,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:17,297 INFO L482 AbstractCegarLoop]: Abstraction has 511 states and 1622 transitions. [2021-05-22 02:34:17,297 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,297 INFO L276 IsEmpty]: Start isEmpty. Operand 511 states and 1622 transitions. [2021-05-22 02:34:17,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:17,298 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:17,298 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:17,498 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1052 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6125 [2021-05-22 02:34:17,498 INFO L430 AbstractCegarLoop]: === Iteration 1064 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:17,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:17,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1080660125, now seen corresponding path program 1052 times [2021-05-22 02:34:17,499 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:17,499 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529982962] [2021-05-22 02:34:17,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:17,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:17,573 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:17,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:17,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529982962] [2021-05-22 02:34:17,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529982962] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:17,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [882016429] [2021-05-22 02:34:17,573 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1053 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1053 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:17,598 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:17,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:17,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:17,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:17,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:17,619 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:17,621 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,627 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:17,628 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:17,628 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:17,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:17,677 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,679 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:17,679 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:17,680 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:17,680 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:17,689 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:17,689 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [882016429] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:17,689 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:17,689 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:17,690 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336182825] [2021-05-22 02:34:17,690 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:17,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:17,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:17,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:17,690 INFO L87 Difference]: Start difference. First operand 511 states and 1622 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:17,874 INFO L93 Difference]: Finished difference Result 771 states and 2368 transitions. [2021-05-22 02:34:17,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:17,875 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:17,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:17,876 INFO L225 Difference]: With dead ends: 771 [2021-05-22 02:34:17,876 INFO L226 Difference]: Without dead ends: 750 [2021-05-22 02:34:17,876 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 125.0ms TimeCoverageRelationStatistics Valid=51, Invalid=189, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:17,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 750 states. [2021-05-22 02:34:17,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 750 to 503. [2021-05-22 02:34:17,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 503 states, 502 states have (on average 3.1733067729083664) internal successors, (1593), 502 states have internal predecessors, (1593), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 503 states to 503 states and 1593 transitions. [2021-05-22 02:34:17,882 INFO L78 Accepts]: Start accepts. Automaton has 503 states and 1593 transitions. Word has length 21 [2021-05-22 02:34:17,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:17,882 INFO L482 AbstractCegarLoop]: Abstraction has 503 states and 1593 transitions. [2021-05-22 02:34:17,882 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:17,882 INFO L276 IsEmpty]: Start isEmpty. Operand 503 states and 1593 transitions. [2021-05-22 02:34:17,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:17,882 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:17,882 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:18,083 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1053 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6128 [2021-05-22 02:34:18,083 INFO L430 AbstractCegarLoop]: === Iteration 1065 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:18,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:18,083 INFO L82 PathProgramCache]: Analyzing trace with hash -140943453, now seen corresponding path program 1053 times [2021-05-22 02:34:18,083 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:18,083 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59221980] [2021-05-22 02:34:18,083 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:18,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:18,159 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:18,159 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:18,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59221980] [2021-05-22 02:34:18,159 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59221980] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:18,159 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471801267] [2021-05-22 02:34:18,159 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1054 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1054 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:18,186 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:18,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:18,186 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:18,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:18,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:18,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:18,211 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,218 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:18,219 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:18,219 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:18,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:18,250 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,254 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:18,254 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:18,254 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,254 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:18,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:18,296 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [471801267] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:18,296 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:18,296 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:34:18,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28243120] [2021-05-22 02:34:18,296 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:34:18,296 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:18,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:34:18,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:18,297 INFO L87 Difference]: Start difference. First operand 503 states and 1593 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:18,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:18,652 INFO L93 Difference]: Finished difference Result 822 states and 2511 transitions. [2021-05-22 02:34:18,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:18,652 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:18,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:18,653 INFO L225 Difference]: With dead ends: 822 [2021-05-22 02:34:18,654 INFO L226 Difference]: Without dead ends: 803 [2021-05-22 02:34:18,654 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 262.0ms TimeCoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:18,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 803 states. [2021-05-22 02:34:18,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 803 to 477. [2021-05-22 02:34:18,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 476 states have (on average 3.161764705882353) internal successors, (1505), 476 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:18,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 1505 transitions. [2021-05-22 02:34:18,660 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 1505 transitions. Word has length 21 [2021-05-22 02:34:18,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:18,660 INFO L482 AbstractCegarLoop]: Abstraction has 477 states and 1505 transitions. [2021-05-22 02:34:18,660 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:18,660 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 1505 transitions. [2021-05-22 02:34:18,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:18,660 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:18,660 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:18,860 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1054 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6132 [2021-05-22 02:34:18,861 INFO L430 AbstractCegarLoop]: === Iteration 1066 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:18,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:18,861 INFO L82 PathProgramCache]: Analyzing trace with hash 596552779, now seen corresponding path program 1054 times [2021-05-22 02:34:18,861 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:18,861 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762128113] [2021-05-22 02:34:18,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:18,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:18,927 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:18,927 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:18,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762128113] [2021-05-22 02:34:18,927 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [762128113] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:18,927 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017744807] [2021-05-22 02:34:18,927 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1055 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1055 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:18,959 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:18,959 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:18,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:18,960 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:18,984 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:18,985 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:18,988 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:18,994 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:18,994 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:18,994 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:19,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:19,016 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,019 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:19,019 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:19,019 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,019 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:19,029 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:19,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017744807] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:19,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:19,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:34:19,029 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081062493] [2021-05-22 02:34:19,029 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:34:19,029 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:19,029 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:34:19,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:34:19,029 INFO L87 Difference]: Start difference. First operand 477 states and 1505 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:19,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:19,219 INFO L93 Difference]: Finished difference Result 843 states and 2558 transitions. [2021-05-22 02:34:19,219 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:19,219 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:19,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:19,220 INFO L225 Difference]: With dead ends: 843 [2021-05-22 02:34:19,221 INFO L226 Difference]: Without dead ends: 822 [2021-05-22 02:34:19,221 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 107.4ms TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:19,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 822 states. [2021-05-22 02:34:19,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 822 to 470. [2021-05-22 02:34:19,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.159914712153518) internal successors, (1482), 469 states have internal predecessors, (1482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:19,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1482 transitions. [2021-05-22 02:34:19,227 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1482 transitions. Word has length 21 [2021-05-22 02:34:19,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:19,227 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1482 transitions. [2021-05-22 02:34:19,227 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:19,227 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1482 transitions. [2021-05-22 02:34:19,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:19,227 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:19,227 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:19,427 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1055 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6135 [2021-05-22 02:34:19,428 INFO L430 AbstractCegarLoop]: === Iteration 1067 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:19,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:19,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1940750485, now seen corresponding path program 1055 times [2021-05-22 02:34:19,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:19,428 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1074402291] [2021-05-22 02:34:19,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:19,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:19,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:19,511 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:19,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1074402291] [2021-05-22 02:34:19,511 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1074402291] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:19,511 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532091803] [2021-05-22 02:34:19,511 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1056 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1056 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:19,536 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:19,536 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:19,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:19,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:19,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:19,569 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,570 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:19,571 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,586 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:19,587 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:19,587 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:57, output treesize:43 [2021-05-22 02:34:19,640 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:19,641 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:34:19,643 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:19,651 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:19,651 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:19,652 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:19,652 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:34:19,697 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:19,697 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532091803] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:19,697 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:19,698 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:34:19,698 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879167306] [2021-05-22 02:34:19,698 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:34:19,698 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:19,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:34:19,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:19,698 INFO L87 Difference]: Start difference. First operand 470 states and 1482 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:20,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:20,188 INFO L93 Difference]: Finished difference Result 723 states and 2240 transitions. [2021-05-22 02:34:20,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-22 02:34:20,188 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:20,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:20,189 INFO L225 Difference]: With dead ends: 723 [2021-05-22 02:34:20,189 INFO L226 Difference]: Without dead ends: 702 [2021-05-22 02:34:20,189 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 377.6ms TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:20,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-05-22 02:34:20,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 476. [2021-05-22 02:34:20,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1515789473684213) internal successors, (1497), 475 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:20,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1497 transitions. [2021-05-22 02:34:20,195 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1497 transitions. Word has length 21 [2021-05-22 02:34:20,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:20,195 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1497 transitions. [2021-05-22 02:34:20,195 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:20,195 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1497 transitions. [2021-05-22 02:34:20,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:20,195 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:20,195 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:20,396 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6139,1056 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:20,396 INFO L430 AbstractCegarLoop]: === Iteration 1068 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:20,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:20,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1024288649, now seen corresponding path program 1056 times [2021-05-22 02:34:20,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:20,396 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678125242] [2021-05-22 02:34:20,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:20,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:20,488 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:20,488 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:20,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678125242] [2021-05-22 02:34:20,488 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678125242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:20,488 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461347387] [2021-05-22 02:34:20,488 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1057 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1057 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:20,515 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:20,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:20,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:20,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:20,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:20,581 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:20,584 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:20,585 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:20,585 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:20,600 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:20,601 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:20,605 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:20,605 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:20,605 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:20,605 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:20,647 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:20,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1461347387] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:20,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:20,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:20,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451928274] [2021-05-22 02:34:20,648 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:20,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:20,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:20,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:20,648 INFO L87 Difference]: Start difference. First operand 476 states and 1497 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:21,055 INFO L93 Difference]: Finished difference Result 717 states and 2208 transitions. [2021-05-22 02:34:21,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:34:21,055 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:21,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:21,056 INFO L225 Difference]: With dead ends: 717 [2021-05-22 02:34:21,056 INFO L226 Difference]: Without dead ends: 696 [2021-05-22 02:34:21,056 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 321.0ms TimeCoverageRelationStatistics Valid=111, Invalid=441, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:21,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 696 states. [2021-05-22 02:34:21,060 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 696 to 473. [2021-05-22 02:34:21,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 473 states, 472 states have (on average 3.1461864406779663) internal successors, (1485), 472 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,061 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 473 states to 473 states and 1485 transitions. [2021-05-22 02:34:21,062 INFO L78 Accepts]: Start accepts. Automaton has 473 states and 1485 transitions. Word has length 21 [2021-05-22 02:34:21,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:21,062 INFO L482 AbstractCegarLoop]: Abstraction has 473 states and 1485 transitions. [2021-05-22 02:34:21,062 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,062 INFO L276 IsEmpty]: Start isEmpty. Operand 473 states and 1485 transitions. [2021-05-22 02:34:21,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:21,062 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:21,062 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:21,262 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6147,1057 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:21,263 INFO L430 AbstractCegarLoop]: === Iteration 1069 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:21,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:21,263 INFO L82 PathProgramCache]: Analyzing trace with hash 109207161, now seen corresponding path program 1057 times [2021-05-22 02:34:21,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:21,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [496966359] [2021-05-22 02:34:21,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:21,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:21,348 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:21,349 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:21,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [496966359] [2021-05-22 02:34:21,349 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [496966359] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:21,349 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771268474] [2021-05-22 02:34:21,349 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1058 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1058 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:21,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:21,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:21,375 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:21,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:21,418 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:21,422 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:21,422 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:21,422 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:21,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:21,438 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:21,441 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:21,441 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:21,441 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:21,442 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:21,483 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:21,483 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771268474] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:21,483 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:21,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:21,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286239746] [2021-05-22 02:34:21,483 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:21,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:21,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:21,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:21,483 INFO L87 Difference]: Start difference. First operand 473 states and 1485 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:21,781 INFO L93 Difference]: Finished difference Result 695 states and 2139 transitions. [2021-05-22 02:34:21,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:21,781 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:21,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:21,782 INFO L225 Difference]: With dead ends: 695 [2021-05-22 02:34:21,782 INFO L226 Difference]: Without dead ends: 674 [2021-05-22 02:34:21,782 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 228.0ms TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:34:21,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-22 02:34:21,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 470. [2021-05-22 02:34:21,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1471215351812365) internal successors, (1476), 469 states have internal predecessors, (1476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1476 transitions. [2021-05-22 02:34:21,788 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1476 transitions. Word has length 21 [2021-05-22 02:34:21,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:21,788 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1476 transitions. [2021-05-22 02:34:21,788 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:21,788 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1476 transitions. [2021-05-22 02:34:21,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:21,788 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:21,788 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:21,989 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1058 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6150 [2021-05-22 02:34:21,989 INFO L430 AbstractCegarLoop]: === Iteration 1070 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:21,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:21,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1594296487, now seen corresponding path program 1058 times [2021-05-22 02:34:21,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:21,989 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [196575391] [2021-05-22 02:34:21,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:21,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:22,066 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:22,066 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:22,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [196575391] [2021-05-22 02:34:22,066 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [196575391] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:22,066 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1350051966] [2021-05-22 02:34:22,066 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1059 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1059 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:22,092 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:22,092 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:22,092 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:22,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:22,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:22,112 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,115 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:22,115 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,115 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:34:22,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:22,131 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,135 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:22,135 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:22,135 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,135 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:22,176 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:22,176 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1350051966] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:22,176 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:22,176 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:22,176 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430346774] [2021-05-22 02:34:22,176 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:22,176 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:22,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:22,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:22,176 INFO L87 Difference]: Start difference. First operand 470 states and 1476 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:22,457 INFO L93 Difference]: Finished difference Result 784 states and 2376 transitions. [2021-05-22 02:34:22,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:22,457 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:22,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:22,458 INFO L225 Difference]: With dead ends: 784 [2021-05-22 02:34:22,458 INFO L226 Difference]: Without dead ends: 763 [2021-05-22 02:34:22,458 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68 ImplicationChecksByTransitivity, 199.6ms TimeCoverageRelationStatistics Valid=86, Invalid=334, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:34:22,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 763 states. [2021-05-22 02:34:22,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 763 to 437. [2021-05-22 02:34:22,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 436 states have (on average 3.114678899082569) internal successors, (1358), 436 states have internal predecessors, (1358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 1358 transitions. [2021-05-22 02:34:22,464 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 1358 transitions. Word has length 21 [2021-05-22 02:34:22,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:22,464 INFO L482 AbstractCegarLoop]: Abstraction has 437 states and 1358 transitions. [2021-05-22 02:34:22,464 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,464 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 1358 transitions. [2021-05-22 02:34:22,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:22,464 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:22,464 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:22,665 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6152,1059 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:22,665 INFO L430 AbstractCegarLoop]: === Iteration 1071 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:22,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:22,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1643782331, now seen corresponding path program 1059 times [2021-05-22 02:34:22,665 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:22,665 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [555478171] [2021-05-22 02:34:22,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:22,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:22,726 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:22,726 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:22,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [555478171] [2021-05-22 02:34:22,726 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [555478171] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:22,726 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1571693019] [2021-05-22 02:34:22,726 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1060 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1060 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:22,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:22,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:22,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:22,753 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:22,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:22,771 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:22,773 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,779 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:22,779 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:22,779 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:22,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:22,798 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,801 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:22,801 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:22,801 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:22,801 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:34:22,814 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:22,814 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1571693019] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:22,814 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:22,814 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:34:22,814 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423774635] [2021-05-22 02:34:22,814 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:34:22,814 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:22,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:34:22,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:34:22,815 INFO L87 Difference]: Start difference. First operand 437 states and 1358 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:22,965 INFO L93 Difference]: Finished difference Result 834 states and 2478 transitions. [2021-05-22 02:34:22,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:22,965 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:22,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:22,966 INFO L225 Difference]: With dead ends: 834 [2021-05-22 02:34:22,966 INFO L226 Difference]: Without dead ends: 812 [2021-05-22 02:34:22,966 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 97.0ms TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:22,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 812 states. [2021-05-22 02:34:22,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 812 to 441. [2021-05-22 02:34:22,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 441 states, 440 states have (on average 3.1136363636363638) internal successors, (1370), 440 states have internal predecessors, (1370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 441 states to 441 states and 1370 transitions. [2021-05-22 02:34:22,971 INFO L78 Accepts]: Start accepts. Automaton has 441 states and 1370 transitions. Word has length 21 [2021-05-22 02:34:22,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:22,971 INFO L482 AbstractCegarLoop]: Abstraction has 441 states and 1370 transitions. [2021-05-22 02:34:22,971 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:22,971 INFO L276 IsEmpty]: Start isEmpty. Operand 441 states and 1370 transitions. [2021-05-22 02:34:22,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:22,972 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:22,972 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:23,172 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1060 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6154 [2021-05-22 02:34:23,173 INFO L430 AbstractCegarLoop]: === Iteration 1072 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:23,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:23,173 INFO L82 PathProgramCache]: Analyzing trace with hash -1364637935, now seen corresponding path program 1060 times [2021-05-22 02:34:23,173 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:23,173 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91497134] [2021-05-22 02:34:23,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:23,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:23,245 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:23,246 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:23,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91497134] [2021-05-22 02:34:23,246 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91497134] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:23,246 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434497768] [2021-05-22 02:34:23,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1061 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1061 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:23,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:23,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:23,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:23,272 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:23,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:23,286 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:23,289 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:23,290 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:23,290 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:18 [2021-05-22 02:34:23,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:23,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:23,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:23,337 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:23,343 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:23,343 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:23,343 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:23,343 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:34:23,394 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:23,394 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434497768] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:23,394 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:23,394 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:23,394 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571008442] [2021-05-22 02:34:23,394 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:23,394 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:23,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:23,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:23,395 INFO L87 Difference]: Start difference. First operand 441 states and 1370 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:23,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:23,856 INFO L93 Difference]: Finished difference Result 903 states and 2690 transitions. [2021-05-22 02:34:23,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:23,856 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:23,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:23,857 INFO L225 Difference]: With dead ends: 903 [2021-05-22 02:34:23,857 INFO L226 Difference]: Without dead ends: 872 [2021-05-22 02:34:23,857 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 358.2ms TimeCoverageRelationStatistics Valid=152, Invalid=550, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:34:23,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 872 states. [2021-05-22 02:34:23,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 872 to 444. [2021-05-22 02:34:23,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 444 states, 443 states have (on average 3.110609480812641) internal successors, (1378), 443 states have internal predecessors, (1378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:23,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 444 states to 444 states and 1378 transitions. [2021-05-22 02:34:23,863 INFO L78 Accepts]: Start accepts. Automaton has 444 states and 1378 transitions. Word has length 21 [2021-05-22 02:34:23,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:23,863 INFO L482 AbstractCegarLoop]: Abstraction has 444 states and 1378 transitions. [2021-05-22 02:34:23,863 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:23,863 INFO L276 IsEmpty]: Start isEmpty. Operand 444 states and 1378 transitions. [2021-05-22 02:34:23,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:23,864 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:23,864 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:24,064 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1061 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6157 [2021-05-22 02:34:24,064 INFO L430 AbstractCegarLoop]: === Iteration 1073 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:24,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:24,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1648900619, now seen corresponding path program 1061 times [2021-05-22 02:34:24,064 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:24,065 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775066551] [2021-05-22 02:34:24,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:24,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:24,135 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:24,135 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:24,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775066551] [2021-05-22 02:34:24,135 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775066551] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:24,135 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661514672] [2021-05-22 02:34:24,135 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1062 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1062 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:24,161 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:24,161 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:24,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:24,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:24,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:24,180 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,182 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:24,182 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:24,185 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,187 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:24,188 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,209 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:24,210 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:34:24,210 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:89, output treesize:57 [2021-05-22 02:34:24,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:24,291 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:34:24,294 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:24,296 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:24,307 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:24,307 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:24,308 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:34:24,308 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 2 variables, input treesize:69, output treesize:26 [2021-05-22 02:34:24,375 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:24,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661514672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:24,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:24,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:24,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [185931045] [2021-05-22 02:34:24,376 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:24,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:24,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:24,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:24,376 INFO L87 Difference]: Start difference. First operand 444 states and 1378 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:25,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:25,936 INFO L93 Difference]: Finished difference Result 1188 states and 3636 transitions. [2021-05-22 02:34:25,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-22 02:34:25,937 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:25,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:25,938 INFO L225 Difference]: With dead ends: 1188 [2021-05-22 02:34:25,938 INFO L226 Difference]: Without dead ends: 1134 [2021-05-22 02:34:25,938 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 638 ImplicationChecksByTransitivity, 1208.6ms TimeCoverageRelationStatistics Valid=436, Invalid=2014, Unknown=0, NotChecked=0, Total=2450 [2021-05-22 02:34:25,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1134 states. [2021-05-22 02:34:25,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1134 to 470. [2021-05-22 02:34:25,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.14498933901919) internal successors, (1475), 469 states have internal predecessors, (1475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:25,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1475 transitions. [2021-05-22 02:34:25,950 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1475 transitions. Word has length 21 [2021-05-22 02:34:25,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:25,950 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1475 transitions. [2021-05-22 02:34:25,950 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:25,950 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1475 transitions. [2021-05-22 02:34:25,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:25,951 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:25,951 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:26,151 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1062 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6160 [2021-05-22 02:34:26,151 INFO L430 AbstractCegarLoop]: === Iteration 1074 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:26,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:26,152 INFO L82 PathProgramCache]: Analyzing trace with hash 37491221, now seen corresponding path program 1062 times [2021-05-22 02:34:26,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:26,152 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386631846] [2021-05-22 02:34:26,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:26,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:26,221 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:26,221 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:26,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386631846] [2021-05-22 02:34:26,221 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [386631846] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:26,221 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467095733] [2021-05-22 02:34:26,221 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1063 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1063 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:26,247 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:26,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:26,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:26,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:26,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:26,265 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:26,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:26,267 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:26,273 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:26,274 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:26,274 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:26,332 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:26,333 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:26,335 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:26,335 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:26,336 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:26,336 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:26,363 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:26,363 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467095733] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:26,363 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:26,363 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:26,363 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583582290] [2021-05-22 02:34:26,364 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:26,364 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:26,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:26,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:26,364 INFO L87 Difference]: Start difference. First operand 470 states and 1475 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:27,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:27,133 INFO L93 Difference]: Finished difference Result 978 states and 2989 transitions. [2021-05-22 02:34:27,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-05-22 02:34:27,134 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:27,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:27,135 INFO L225 Difference]: With dead ends: 978 [2021-05-22 02:34:27,135 INFO L226 Difference]: Without dead ends: 957 [2021-05-22 02:34:27,135 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 519.5ms TimeCoverageRelationStatistics Valid=250, Invalid=1156, Unknown=0, NotChecked=0, Total=1406 [2021-05-22 02:34:27,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 957 states. [2021-05-22 02:34:27,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 957 to 465. [2021-05-22 02:34:27,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1422413793103448) internal successors, (1458), 464 states have internal predecessors, (1458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:27,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1458 transitions. [2021-05-22 02:34:27,142 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1458 transitions. Word has length 21 [2021-05-22 02:34:27,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:27,142 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1458 transitions. [2021-05-22 02:34:27,142 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:27,142 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1458 transitions. [2021-05-22 02:34:27,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:27,143 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:27,143 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:27,343 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6170,1063 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:27,343 INFO L430 AbstractCegarLoop]: === Iteration 1075 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:27,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:27,343 INFO L82 PathProgramCache]: Analyzing trace with hash 1077727019, now seen corresponding path program 1063 times [2021-05-22 02:34:27,343 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:27,344 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [442828326] [2021-05-22 02:34:27,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:27,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:27,422 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:27,422 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:27,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [442828326] [2021-05-22 02:34:27,422 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [442828326] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:27,422 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [537518897] [2021-05-22 02:34:27,422 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1064 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1064 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:27,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:27,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:27,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:27,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:27,480 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:27,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:27,483 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:27,489 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:27,490 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:27,490 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:27,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:27,548 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:27,551 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:27,551 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:27,551 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:27,551 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:27,578 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:27,578 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [537518897] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:27,578 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:27,578 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:27,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331806087] [2021-05-22 02:34:27,578 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:27,578 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:27,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:27,578 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:27,579 INFO L87 Difference]: Start difference. First operand 465 states and 1458 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:28,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:28,490 INFO L93 Difference]: Finished difference Result 1097 states and 3339 transitions. [2021-05-22 02:34:28,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-05-22 02:34:28,490 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:28,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:28,492 INFO L225 Difference]: With dead ends: 1097 [2021-05-22 02:34:28,492 INFO L226 Difference]: Without dead ends: 1076 [2021-05-22 02:34:28,492 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 494 ImplicationChecksByTransitivity, 627.4ms TimeCoverageRelationStatistics Valid=356, Invalid=1624, Unknown=0, NotChecked=0, Total=1980 [2021-05-22 02:34:28,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1076 states. [2021-05-22 02:34:28,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1076 to 463. [2021-05-22 02:34:28,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.145021645021645) internal successors, (1453), 462 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:28,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1453 transitions. [2021-05-22 02:34:28,499 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1453 transitions. Word has length 21 [2021-05-22 02:34:28,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:28,499 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1453 transitions. [2021-05-22 02:34:28,499 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:28,499 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1453 transitions. [2021-05-22 02:34:28,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:28,499 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:28,499 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:28,700 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1064 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6176 [2021-05-22 02:34:28,700 INFO L430 AbstractCegarLoop]: === Iteration 1076 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:28,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:28,700 INFO L82 PathProgramCache]: Analyzing trace with hash 483969817, now seen corresponding path program 1064 times [2021-05-22 02:34:28,700 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:28,700 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169645888] [2021-05-22 02:34:28,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:28,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:28,768 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:28,768 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:28,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169645888] [2021-05-22 02:34:28,768 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169645888] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:28,768 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776205183] [2021-05-22 02:34:28,768 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1065 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1065 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:28,796 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:28,796 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:28,797 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:28,797 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:28,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:28,830 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:28,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:28,833 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:28,839 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:28,840 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:28,840 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:28,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:28,880 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:28,884 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:28,884 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:28,884 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:28,884 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:34:28,898 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:28,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [776205183] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:28,899 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:28,899 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:34:28,899 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2014280015] [2021-05-22 02:34:28,899 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:34:28,899 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:28,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:34:28,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:34:28,899 INFO L87 Difference]: Start difference. First operand 463 states and 1453 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:29,058 INFO L93 Difference]: Finished difference Result 839 states and 2536 transitions. [2021-05-22 02:34:29,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:29,058 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:29,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:29,059 INFO L225 Difference]: With dead ends: 839 [2021-05-22 02:34:29,059 INFO L226 Difference]: Without dead ends: 817 [2021-05-22 02:34:29,059 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 132.0ms TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:29,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 817 states. [2021-05-22 02:34:29,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 817 to 465. [2021-05-22 02:34:29,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1422413793103448) internal successors, (1458), 464 states have internal predecessors, (1458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1458 transitions. [2021-05-22 02:34:29,065 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1458 transitions. Word has length 21 [2021-05-22 02:34:29,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:29,066 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1458 transitions. [2021-05-22 02:34:29,066 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,066 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1458 transitions. [2021-05-22 02:34:29,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:29,066 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:29,066 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:29,266 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6182,1065 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:29,267 INFO L430 AbstractCegarLoop]: === Iteration 1077 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:29,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:29,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1761039833, now seen corresponding path program 1065 times [2021-05-22 02:34:29,267 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:29,267 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201730496] [2021-05-22 02:34:29,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:29,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:29,337 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:29,337 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:29,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1201730496] [2021-05-22 02:34:29,337 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1201730496] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:29,337 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [952609658] [2021-05-22 02:34:29,337 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1066 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1066 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:29,364 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:29,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:29,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:29,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:29,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:29,390 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:29,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:29,392 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:29,398 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:29,398 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:29,398 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:29,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:29,422 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:29,423 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:29,424 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:29,432 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:29,433 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:29,433 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:29,433 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:29,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:29,455 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [952609658] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:29,455 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:29,455 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:34:29,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152869105] [2021-05-22 02:34:29,455 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:34:29,455 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:29,456 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:34:29,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:34:29,456 INFO L87 Difference]: Start difference. First operand 465 states and 1458 transitions. Second operand has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:29,660 INFO L93 Difference]: Finished difference Result 853 states and 2574 transitions. [2021-05-22 02:34:29,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:29,660 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:29,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:29,661 INFO L225 Difference]: With dead ends: 853 [2021-05-22 02:34:29,661 INFO L226 Difference]: Without dead ends: 824 [2021-05-22 02:34:29,662 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 129.8ms TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:29,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 824 states. [2021-05-22 02:34:29,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 824 to 458. [2021-05-22 02:34:29,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1334792122538295) internal successors, (1432), 457 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1432 transitions. [2021-05-22 02:34:29,667 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1432 transitions. Word has length 21 [2021-05-22 02:34:29,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:29,667 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1432 transitions. [2021-05-22 02:34:29,667 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:29,667 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1432 transitions. [2021-05-22 02:34:29,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:29,668 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:29,668 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:29,868 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1066 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6185 [2021-05-22 02:34:29,868 INFO L430 AbstractCegarLoop]: === Iteration 1078 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:29,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:29,869 INFO L82 PathProgramCache]: Analyzing trace with hash -454154905, now seen corresponding path program 1066 times [2021-05-22 02:34:29,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:29,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384705883] [2021-05-22 02:34:29,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:29,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:29,953 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:29,953 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:29,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384705883] [2021-05-22 02:34:29,953 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384705883] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:29,953 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181599999] [2021-05-22 02:34:29,953 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1067 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1067 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:29,984 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:29,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:29,985 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:29,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:30,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:30,024 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:30,026 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,034 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:30,035 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:30,035 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:30,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:30,071 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,075 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:30,075 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:30,075 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,075 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:34:30,088 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:30,088 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181599999] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:30,088 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:30,088 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:30,088 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105372508] [2021-05-22 02:34:30,088 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:30,088 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:30,088 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:30,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:30,089 INFO L87 Difference]: Start difference. First operand 458 states and 1432 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:30,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:30,261 INFO L93 Difference]: Finished difference Result 694 states and 2099 transitions. [2021-05-22 02:34:30,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:30,261 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:30,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:30,262 INFO L225 Difference]: With dead ends: 694 [2021-05-22 02:34:30,262 INFO L226 Difference]: Without dead ends: 672 [2021-05-22 02:34:30,262 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 159.4ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:30,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 672 states. [2021-05-22 02:34:30,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 672 to 463. [2021-05-22 02:34:30,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1363636363636362) internal successors, (1449), 462 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:30,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1449 transitions. [2021-05-22 02:34:30,272 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1449 transitions. Word has length 21 [2021-05-22 02:34:30,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:30,272 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1449 transitions. [2021-05-22 02:34:30,272 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:30,272 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1449 transitions. [2021-05-22 02:34:30,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:30,272 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:30,272 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:30,473 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1067 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6189 [2021-05-22 02:34:30,473 INFO L430 AbstractCegarLoop]: === Iteration 1079 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:30,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:30,473 INFO L82 PathProgramCache]: Analyzing trace with hash 171169213, now seen corresponding path program 1067 times [2021-05-22 02:34:30,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:30,473 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [641664778] [2021-05-22 02:34:30,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:30,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:30,546 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:30,546 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [641664778] [2021-05-22 02:34:30,546 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [641664778] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:30,546 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229969600] [2021-05-22 02:34:30,547 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1068 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1068 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:30,572 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:30,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:30,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:30,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:30,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:30,606 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:30,609 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:30,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:30,627 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:67, output treesize:53 [2021-05-22 02:34:30,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 22 [2021-05-22 02:34:30,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,696 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:30,696 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-05-22 02:34:30,699 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:30,701 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:30,724 INFO L628 ElimStorePlain]: treesize reduction 8, result has 76.5 percent of original size [2021-05-22 02:34:30,724 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:30,725 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:34:30,725 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:101, output treesize:26 [2021-05-22 02:34:30,794 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:30,795 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229969600] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:30,795 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:30,795 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:30,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192012965] [2021-05-22 02:34:30,795 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:30,795 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:30,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:30,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:30,795 INFO L87 Difference]: Start difference. First operand 463 states and 1449 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:31,268 INFO L93 Difference]: Finished difference Result 799 states and 2417 transitions. [2021-05-22 02:34:31,268 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:34:31,269 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:31,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:31,270 INFO L225 Difference]: With dead ends: 799 [2021-05-22 02:34:31,270 INFO L226 Difference]: Without dead ends: 772 [2021-05-22 02:34:31,270 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 158 ImplicationChecksByTransitivity, 442.5ms TimeCoverageRelationStatistics Valid=146, Invalid=666, Unknown=0, NotChecked=0, Total=812 [2021-05-22 02:34:31,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 772 states. [2021-05-22 02:34:31,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 772 to 463. [2021-05-22 02:34:31,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.132034632034632) internal successors, (1447), 462 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1447 transitions. [2021-05-22 02:34:31,276 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1447 transitions. Word has length 21 [2021-05-22 02:34:31,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:31,276 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1447 transitions. [2021-05-22 02:34:31,276 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,276 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1447 transitions. [2021-05-22 02:34:31,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:31,276 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:31,276 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:31,477 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6192,1068 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:31,477 INFO L430 AbstractCegarLoop]: === Iteration 1080 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:31,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:31,477 INFO L82 PathProgramCache]: Analyzing trace with hash 1595802741, now seen corresponding path program 1068 times [2021-05-22 02:34:31,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:31,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440852844] [2021-05-22 02:34:31,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:31,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:31,547 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:31,547 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:31,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440852844] [2021-05-22 02:34:31,547 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440852844] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:31,547 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863543025] [2021-05-22 02:34:31,547 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1069 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1069 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:31,574 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:31,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:31,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:31,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:31,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:31,613 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:31,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:31,615 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:31,624 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:31,624 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:31,624 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:31,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:31,651 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:31,661 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:31,661 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:31,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:31,663 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:31,671 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:31,671 INFO L518 ElimStorePlain]: Eliminatee v_prenex_320 vanished before elimination [2021-05-22 02:34:31,672 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:31,672 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:31,709 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:31,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863543025] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:31,710 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:31,710 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:31,710 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219497349] [2021-05-22 02:34:31,710 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:31,710 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:31,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:31,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:31,710 INFO L87 Difference]: Start difference. First operand 463 states and 1447 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:31,948 INFO L93 Difference]: Finished difference Result 739 states and 2231 transitions. [2021-05-22 02:34:31,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:31,948 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:31,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:31,949 INFO L225 Difference]: With dead ends: 739 [2021-05-22 02:34:31,949 INFO L226 Difference]: Without dead ends: 710 [2021-05-22 02:34:31,949 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 168.6ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:31,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 710 states. [2021-05-22 02:34:31,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 710 to 464. [2021-05-22 02:34:31,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.138228941684665) internal successors, (1453), 463 states have internal predecessors, (1453), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1453 transitions. [2021-05-22 02:34:31,954 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1453 transitions. Word has length 21 [2021-05-22 02:34:31,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:31,954 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1453 transitions. [2021-05-22 02:34:31,954 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:31,954 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1453 transitions. [2021-05-22 02:34:31,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:31,955 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:31,955 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:32,155 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1069 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6202 [2021-05-22 02:34:32,155 INFO L430 AbstractCegarLoop]: === Iteration 1081 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:32,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:32,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1893069151, now seen corresponding path program 1069 times [2021-05-22 02:34:32,156 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:32,156 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718172954] [2021-05-22 02:34:32,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:32,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:32,234 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:32,234 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:32,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718172954] [2021-05-22 02:34:32,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718172954] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:32,234 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578781203] [2021-05-22 02:34:32,234 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1070 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1070 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:32,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:32,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:32,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:32,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:32,293 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:32,297 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:32,298 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:32,298 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:34:32,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:32,319 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:32,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:32,321 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:32,329 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:32,330 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:32,330 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:32,330 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:34:32,398 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:32,399 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [578781203] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:32,399 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:32,399 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:32,399 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [136443513] [2021-05-22 02:34:32,399 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:32,399 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:32,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:32,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:32,399 INFO L87 Difference]: Start difference. First operand 464 states and 1453 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:32,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:32,846 INFO L93 Difference]: Finished difference Result 823 states and 2474 transitions. [2021-05-22 02:34:32,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:32,846 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:32,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:32,847 INFO L225 Difference]: With dead ends: 823 [2021-05-22 02:34:32,847 INFO L226 Difference]: Without dead ends: 800 [2021-05-22 02:34:32,847 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 357.9ms TimeCoverageRelationStatistics Valid=134, Invalid=568, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:34:32,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 800 states. [2021-05-22 02:34:32,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 800 to 460. [2021-05-22 02:34:32,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.130718954248366) internal successors, (1437), 459 states have internal predecessors, (1437), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:32,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1437 transitions. [2021-05-22 02:34:32,853 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1437 transitions. Word has length 21 [2021-05-22 02:34:32,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:32,853 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1437 transitions. [2021-05-22 02:34:32,853 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:32,853 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1437 transitions. [2021-05-22 02:34:32,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:32,854 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:32,854 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:33,054 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6207,1070 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:33,054 INFO L430 AbstractCegarLoop]: === Iteration 1082 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:33,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:33,055 INFO L82 PathProgramCache]: Analyzing trace with hash -1001919611, now seen corresponding path program 1070 times [2021-05-22 02:34:33,055 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:33,055 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846868038] [2021-05-22 02:34:33,055 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:33,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:33,124 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:33,124 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:33,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846868038] [2021-05-22 02:34:33,124 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846868038] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:33,124 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093157208] [2021-05-22 02:34:33,124 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1071 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1071 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:33,151 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:33,151 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:33,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:33,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:33,190 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:33,191 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,195 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:33,196 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,196 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:34:33,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:34:33,218 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:34:33,220 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,228 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:33,229 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:33,229 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:33,229 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:33,262 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:33,262 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093157208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:33,262 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:33,262 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:33,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1425488739] [2021-05-22 02:34:33,262 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:33,262 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:33,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:33,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:33,263 INFO L87 Difference]: Start difference. First operand 460 states and 1437 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:33,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:33,459 INFO L93 Difference]: Finished difference Result 710 states and 2140 transitions. [2021-05-22 02:34:33,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:33,459 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:33,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:33,460 INFO L225 Difference]: With dead ends: 710 [2021-05-22 02:34:33,460 INFO L226 Difference]: Without dead ends: 674 [2021-05-22 02:34:33,460 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 144.8ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:33,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 674 states. [2021-05-22 02:34:33,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 674 to 461. [2021-05-22 02:34:33,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.134782608695652) internal successors, (1442), 460 states have internal predecessors, (1442), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:33,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1442 transitions. [2021-05-22 02:34:33,465 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1442 transitions. Word has length 21 [2021-05-22 02:34:33,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:33,465 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1442 transitions. [2021-05-22 02:34:33,465 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:33,465 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1442 transitions. [2021-05-22 02:34:33,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:33,466 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:33,466 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:33,666 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1071 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6213 [2021-05-22 02:34:33,666 INFO L430 AbstractCegarLoop]: === Iteration 1083 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:33,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:33,667 INFO L82 PathProgramCache]: Analyzing trace with hash -704653201, now seen corresponding path program 1071 times [2021-05-22 02:34:33,667 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:33,667 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563180968] [2021-05-22 02:34:33,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:33,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:33,744 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:33,744 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:33,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563180968] [2021-05-22 02:34:33,745 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563180968] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:33,745 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195347853] [2021-05-22 02:34:33,745 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1072 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1072 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:33,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:33,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:33,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:33,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:33,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:33,809 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:33,811 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,820 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:33,820 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:33,820 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:33,846 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:33,846 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,856 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:33,856 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:33,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:33,859 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:33,867 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:33,867 INFO L518 ElimStorePlain]: Eliminatee v_prenex_322 vanished before elimination [2021-05-22 02:34:33,868 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:33,868 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:33,936 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:33,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195347853] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:33,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:33,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:33,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760726996] [2021-05-22 02:34:33,937 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:33,937 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:33,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:33,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:33,937 INFO L87 Difference]: Start difference. First operand 461 states and 1442 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:34,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:34,338 INFO L93 Difference]: Finished difference Result 806 states and 2419 transitions. [2021-05-22 02:34:34,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:34,338 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:34,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:34,339 INFO L225 Difference]: With dead ends: 806 [2021-05-22 02:34:34,339 INFO L226 Difference]: Without dead ends: 783 [2021-05-22 02:34:34,339 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 326.3ms TimeCoverageRelationStatistics Valid=117, Invalid=483, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:34,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 783 states. [2021-05-22 02:34:34,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 783 to 476. [2021-05-22 02:34:34,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 475 states have (on average 3.1515789473684213) internal successors, (1497), 475 states have internal predecessors, (1497), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:34,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 1497 transitions. [2021-05-22 02:34:34,345 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 1497 transitions. Word has length 21 [2021-05-22 02:34:34,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:34,345 INFO L482 AbstractCegarLoop]: Abstraction has 476 states and 1497 transitions. [2021-05-22 02:34:34,345 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:34,345 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 1497 transitions. [2021-05-22 02:34:34,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:34,346 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:34,346 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:34,546 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6216,1072 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:34,546 INFO L430 AbstractCegarLoop]: === Iteration 1084 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:34,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:34,547 INFO L82 PathProgramCache]: Analyzing trace with hash -988915885, now seen corresponding path program 1072 times [2021-05-22 02:34:34,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:34,547 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858761738] [2021-05-22 02:34:34,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:34,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:34,638 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:34,638 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:34,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858761738] [2021-05-22 02:34:34,639 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858761738] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:34,639 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [727683414] [2021-05-22 02:34:34,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1073 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1073 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:34,664 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:34,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:34,665 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:34,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:34,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:34,706 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:34,708 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:34,708 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:34,717 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:34,718 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:34,718 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:34,743 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:34,744 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:34,754 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:34,754 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:34,756 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:34,757 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:34,765 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:34,766 INFO L518 ElimStorePlain]: Eliminatee v_prenex_324 vanished before elimination [2021-05-22 02:34:34,766 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:34,766 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:34,839 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:34,839 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [727683414] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:34,839 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:34,839 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:34,839 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390845706] [2021-05-22 02:34:34,839 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:34,839 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:34,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:34,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:34,840 INFO L87 Difference]: Start difference. First operand 476 states and 1497 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:35,163 INFO L93 Difference]: Finished difference Result 747 states and 2298 transitions. [2021-05-22 02:34:35,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:35,163 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:35,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:35,164 INFO L225 Difference]: With dead ends: 747 [2021-05-22 02:34:35,164 INFO L226 Difference]: Without dead ends: 720 [2021-05-22 02:34:35,164 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 253.1ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:35,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2021-05-22 02:34:35,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 482. [2021-05-22 02:34:35,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 482 states, 481 states have (on average 3.1496881496881497) internal successors, (1515), 481 states have internal predecessors, (1515), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 482 states to 482 states and 1515 transitions. [2021-05-22 02:34:35,170 INFO L78 Accepts]: Start accepts. Automaton has 482 states and 1515 transitions. Word has length 21 [2021-05-22 02:34:35,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:35,170 INFO L482 AbstractCegarLoop]: Abstraction has 482 states and 1515 transitions. [2021-05-22 02:34:35,170 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,170 INFO L276 IsEmpty]: Start isEmpty. Operand 482 states and 1515 transitions. [2021-05-22 02:34:35,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:35,171 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:35,171 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:35,371 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6224,1073 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:35,371 INFO L430 AbstractCegarLoop]: === Iteration 1085 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:35,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:35,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1345304445, now seen corresponding path program 1073 times [2021-05-22 02:34:35,371 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:35,371 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468979306] [2021-05-22 02:34:35,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:35,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:35,439 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:35,439 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:35,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468979306] [2021-05-22 02:34:35,439 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468979306] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:35,439 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606134167] [2021-05-22 02:34:35,439 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1074 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1074 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:35,465 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:34:35,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:35,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:35,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:35,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:35,504 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:35,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:35,506 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:35,514 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:35,515 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:35,515 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:35,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:35,551 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:35,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:35,553 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:35,567 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:35,567 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:35,568 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:35,568 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:34:35,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:35,642 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606134167] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:35,642 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:35,642 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:35,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921325780] [2021-05-22 02:34:35,643 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:35,643 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:35,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:35,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:35,643 INFO L87 Difference]: Start difference. First operand 482 states and 1515 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:35,913 INFO L93 Difference]: Finished difference Result 716 states and 2158 transitions. [2021-05-22 02:34:35,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:34:35,914 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:35,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:35,915 INFO L225 Difference]: With dead ends: 716 [2021-05-22 02:34:35,915 INFO L226 Difference]: Without dead ends: 697 [2021-05-22 02:34:35,915 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 271.1ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:34:35,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2021-05-22 02:34:35,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 464. [2021-05-22 02:34:35,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1447084233261338) internal successors, (1456), 463 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1456 transitions. [2021-05-22 02:34:35,920 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1456 transitions. Word has length 21 [2021-05-22 02:34:35,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:35,920 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1456 transitions. [2021-05-22 02:34:35,920 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:35,920 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1456 transitions. [2021-05-22 02:34:35,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:35,921 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:35,921 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:36,121 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1074 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6236 [2021-05-22 02:34:36,121 INFO L430 AbstractCegarLoop]: === Iteration 1086 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:36,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:36,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1890677099, now seen corresponding path program 1074 times [2021-05-22 02:34:36,122 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:36,122 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1303222005] [2021-05-22 02:34:36,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:36,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:36,198 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:36,199 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:36,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1303222005] [2021-05-22 02:34:36,199 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1303222005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:36,199 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405629896] [2021-05-22 02:34:36,199 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1075 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1075 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:36,225 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:36,225 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:36,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:36,226 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:36,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:36,266 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,267 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:36,268 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:36,277 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:36,277 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:36,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:36,334 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,336 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:36,336 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:36,337 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,337 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:36,346 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:36,346 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405629896] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:36,347 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:36,347 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:36,347 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630864344] [2021-05-22 02:34:36,347 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:36,347 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:36,347 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:36,347 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:36,347 INFO L87 Difference]: Start difference. First operand 464 states and 1456 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:36,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:36,554 INFO L93 Difference]: Finished difference Result 610 states and 1872 transitions. [2021-05-22 02:34:36,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:36,555 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:36,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:36,555 INFO L225 Difference]: With dead ends: 610 [2021-05-22 02:34:36,555 INFO L226 Difference]: Without dead ends: 589 [2021-05-22 02:34:36,556 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 181.5ms TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:36,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 589 states. [2021-05-22 02:34:36,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 589 to 464. [2021-05-22 02:34:36,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1533477321814254) internal successors, (1460), 463 states have internal predecessors, (1460), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:36,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1460 transitions. [2021-05-22 02:34:36,561 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1460 transitions. Word has length 21 [2021-05-22 02:34:36,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:36,561 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1460 transitions. [2021-05-22 02:34:36,561 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:36,561 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1460 transitions. [2021-05-22 02:34:36,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:36,561 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:36,561 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:36,761 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1075 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6242 [2021-05-22 02:34:36,762 INFO L430 AbstractCegarLoop]: === Iteration 1087 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:36,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:36,762 INFO L82 PathProgramCache]: Analyzing trace with hash 171692417, now seen corresponding path program 1075 times [2021-05-22 02:34:36,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:36,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47544423] [2021-05-22 02:34:36,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:36,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:36,842 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:36,842 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:36,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47544423] [2021-05-22 02:34:36,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47544423] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:36,842 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1067246144] [2021-05-22 02:34:36,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1076 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1076 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:36,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:36,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:36,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:36,915 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:36,916 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:36,919 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,927 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:36,928 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:36,928 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:36,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:36,963 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,966 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:36,966 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:36,967 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:36,967 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:37,010 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:37,011 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1067246144] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:37,011 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:37,011 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:37,011 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081860461] [2021-05-22 02:34:37,011 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:37,011 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:37,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:37,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:37,011 INFO L87 Difference]: Start difference. First operand 464 states and 1460 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:37,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:37,300 INFO L93 Difference]: Finished difference Result 711 states and 2183 transitions. [2021-05-22 02:34:37,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:37,301 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:37,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:37,302 INFO L225 Difference]: With dead ends: 711 [2021-05-22 02:34:37,302 INFO L226 Difference]: Without dead ends: 690 [2021-05-22 02:34:37,302 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 246.8ms TimeCoverageRelationStatistics Valid=105, Invalid=447, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:37,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-05-22 02:34:37,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 460. [2021-05-22 02:34:37,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 460 states, 459 states have (on average 3.1437908496732025) internal successors, (1443), 459 states have internal predecessors, (1443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:37,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 460 states to 460 states and 1443 transitions. [2021-05-22 02:34:37,307 INFO L78 Accepts]: Start accepts. Automaton has 460 states and 1443 transitions. Word has length 21 [2021-05-22 02:34:37,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:37,307 INFO L482 AbstractCegarLoop]: Abstraction has 460 states and 1443 transitions. [2021-05-22 02:34:37,307 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:37,307 INFO L276 IsEmpty]: Start isEmpty. Operand 460 states and 1443 transitions. [2021-05-22 02:34:37,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:37,308 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:37,308 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:37,508 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1076 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6249 [2021-05-22 02:34:37,508 INFO L430 AbstractCegarLoop]: === Iteration 1088 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:37,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:37,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1568079595, now seen corresponding path program 1076 times [2021-05-22 02:34:37,509 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:37,509 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2089605242] [2021-05-22 02:34:37,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:37,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:37,599 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:37,600 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:37,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2089605242] [2021-05-22 02:34:37,600 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2089605242] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:37,600 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2088379504] [2021-05-22 02:34:37,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1077 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1077 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:37,626 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:37,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:37,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:37,627 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:37,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:37,687 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:37,691 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:37,691 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:37,691 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:37,721 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:37,722 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:37,724 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:37,725 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:37,725 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:37,725 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:37,754 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:37,754 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2088379504] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:37,754 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:37,754 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:37,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [40632052] [2021-05-22 02:34:37,755 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:37,755 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:37,755 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:37,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:37,755 INFO L87 Difference]: Start difference. First operand 460 states and 1443 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:38,033 INFO L93 Difference]: Finished difference Result 704 states and 2168 transitions. [2021-05-22 02:34:38,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:38,034 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:38,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:38,035 INFO L225 Difference]: With dead ends: 704 [2021-05-22 02:34:38,035 INFO L226 Difference]: Without dead ends: 683 [2021-05-22 02:34:38,035 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 205.8ms TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:38,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 683 states. [2021-05-22 02:34:38,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 683 to 466. [2021-05-22 02:34:38,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1483870967741936) internal successors, (1464), 465 states have internal predecessors, (1464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1464 transitions. [2021-05-22 02:34:38,040 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1464 transitions. Word has length 21 [2021-05-22 02:34:38,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:38,040 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1464 transitions. [2021-05-22 02:34:38,040 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,040 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1464 transitions. [2021-05-22 02:34:38,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:38,041 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:38,041 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:38,241 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6253,1077 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:38,242 INFO L430 AbstractCegarLoop]: === Iteration 1089 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:38,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:38,242 INFO L82 PathProgramCache]: Analyzing trace with hash 238151433, now seen corresponding path program 1077 times [2021-05-22 02:34:38,242 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:38,242 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984173849] [2021-05-22 02:34:38,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:38,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:38,316 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:38,316 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:38,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984173849] [2021-05-22 02:34:38,316 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1984173849] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:38,316 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872034208] [2021-05-22 02:34:38,316 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1078 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1078 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:38,342 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:38,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:38,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:38,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:38,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:38,403 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,406 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:38,407 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,407 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:38,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:38,423 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,426 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:38,426 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:38,427 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,427 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:38,441 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:38,441 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872034208] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:38,441 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:38,441 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:38,441 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487355600] [2021-05-22 02:34:38,441 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:38,441 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:38,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:38,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:38,442 INFO L87 Difference]: Start difference. First operand 466 states and 1464 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:38,593 INFO L93 Difference]: Finished difference Result 597 states and 1842 transitions. [2021-05-22 02:34:38,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:38,599 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:38,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:38,599 INFO L225 Difference]: With dead ends: 597 [2021-05-22 02:34:38,600 INFO L226 Difference]: Without dead ends: 576 [2021-05-22 02:34:38,600 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 134.1ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:38,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2021-05-22 02:34:38,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 463. [2021-05-22 02:34:38,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.142857142857143) internal successors, (1452), 462 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1452 transitions. [2021-05-22 02:34:38,604 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1452 transitions. Word has length 21 [2021-05-22 02:34:38,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:38,605 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1452 transitions. [2021-05-22 02:34:38,605 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:38,605 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1452 transitions. [2021-05-22 02:34:38,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:38,605 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:38,605 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:38,805 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1078 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6256 [2021-05-22 02:34:38,806 INFO L430 AbstractCegarLoop]: === Iteration 1090 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:38,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:38,806 INFO L82 PathProgramCache]: Analyzing trace with hash -676930055, now seen corresponding path program 1078 times [2021-05-22 02:34:38,806 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:38,806 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449535942] [2021-05-22 02:34:38,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:38,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:38,888 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:38,888 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:38,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449535942] [2021-05-22 02:34:38,888 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [449535942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:38,888 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [274106590] [2021-05-22 02:34:38,888 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1079 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1079 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:38,913 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:38,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:38,914 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:38,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:38,973 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:38,974 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,977 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:38,978 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,978 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:38,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:38,994 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,998 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:38,998 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:38,998 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:38,998 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:39,049 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:39,050 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [274106590] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:39,050 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:39,050 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:39,050 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1234021167] [2021-05-22 02:34:39,050 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:39,050 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:39,050 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:39,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=246, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:39,050 INFO L87 Difference]: Start difference. First operand 463 states and 1452 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:39,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:39,303 INFO L93 Difference]: Finished difference Result 712 states and 2190 transitions. [2021-05-22 02:34:39,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:39,303 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:39,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:39,304 INFO L225 Difference]: With dead ends: 712 [2021-05-22 02:34:39,304 INFO L226 Difference]: Without dead ends: 691 [2021-05-22 02:34:39,305 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 196.5ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:39,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 691 states. [2021-05-22 02:34:39,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 691 to 459. [2021-05-22 02:34:39,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.1419213973799125) internal successors, (1439), 458 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:39,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1439 transitions. [2021-05-22 02:34:39,310 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1439 transitions. Word has length 21 [2021-05-22 02:34:39,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:39,310 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1439 transitions. [2021-05-22 02:34:39,310 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:39,310 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1439 transitions. [2021-05-22 02:34:39,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:39,311 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:39,311 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:39,511 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6259,1079 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:39,511 INFO L430 AbstractCegarLoop]: === Iteration 1091 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:39,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:39,512 INFO L82 PathProgramCache]: Analyzing trace with hash 915945025, now seen corresponding path program 1079 times [2021-05-22 02:34:39,512 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:39,512 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2057174757] [2021-05-22 02:34:39,512 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:39,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:39,573 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:39,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:39,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2057174757] [2021-05-22 02:34:39,574 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2057174757] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:39,574 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [200073223] [2021-05-22 02:34:39,574 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1080 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1080 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:39,600 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:39,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:39,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:39,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:39,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:39,618 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:39,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:39,620 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:39,632 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:39,633 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:39,633 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:37 [2021-05-22 02:34:39,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:39,699 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:39,700 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:34:39,701 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:39,709 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:39,710 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:39,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:39,710 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:34:39,757 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:39,757 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [200073223] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:39,757 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:39,757 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:34:39,757 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152409693] [2021-05-22 02:34:39,757 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:34:39,757 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:39,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:34:39,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:39,757 INFO L87 Difference]: Start difference. First operand 459 states and 1439 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:40,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:40,901 INFO L93 Difference]: Finished difference Result 1019 states and 3104 transitions. [2021-05-22 02:34:40,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-05-22 02:34:40,901 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:40,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:40,902 INFO L225 Difference]: With dead ends: 1019 [2021-05-22 02:34:40,902 INFO L226 Difference]: Without dead ends: 977 [2021-05-22 02:34:40,902 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 798.3ms TimeCoverageRelationStatistics Valid=366, Invalid=1614, Unknown=0, NotChecked=0, Total=1980 [2021-05-22 02:34:40,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 977 states. [2021-05-22 02:34:40,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 977 to 465. [2021-05-22 02:34:40,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1400862068965516) internal successors, (1457), 464 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:40,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1457 transitions. [2021-05-22 02:34:40,908 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1457 transitions. Word has length 21 [2021-05-22 02:34:40,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:40,909 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1457 transitions. [2021-05-22 02:34:40,909 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:40,909 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1457 transitions. [2021-05-22 02:34:40,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:40,909 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:40,909 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:41,109 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6262,1080 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:41,110 INFO L430 AbstractCegarLoop]: === Iteration 1092 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:41,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:41,110 INFO L82 PathProgramCache]: Analyzing trace with hash 798687523, now seen corresponding path program 1080 times [2021-05-22 02:34:41,110 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:41,110 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524262626] [2021-05-22 02:34:41,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:41,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:41,183 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:41,183 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:41,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524262626] [2021-05-22 02:34:41,183 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1524262626] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:41,183 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108095970] [2021-05-22 02:34:41,183 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1081 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1081 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:41,209 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:34:41,209 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:41,210 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:41,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:41,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:41,259 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,262 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:41,263 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,263 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:41,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:41,278 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,281 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:41,281 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:41,282 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,282 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:41,322 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:41,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108095970] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:41,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:41,322 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:41,322 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050324897] [2021-05-22 02:34:41,322 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:41,322 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:41,323 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:41,323 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:41,323 INFO L87 Difference]: Start difference. First operand 465 states and 1457 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:41,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:41,549 INFO L93 Difference]: Finished difference Result 779 states and 2387 transitions. [2021-05-22 02:34:41,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:41,549 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:41,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:41,550 INFO L225 Difference]: With dead ends: 779 [2021-05-22 02:34:41,550 INFO L226 Difference]: Without dead ends: 758 [2021-05-22 02:34:41,551 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 183.2ms TimeCoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:41,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 758 states. [2021-05-22 02:34:41,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 758 to 458. [2021-05-22 02:34:41,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.140043763676149) internal successors, (1435), 457 states have internal predecessors, (1435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:41,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1435 transitions. [2021-05-22 02:34:41,556 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1435 transitions. Word has length 21 [2021-05-22 02:34:41,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:41,556 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1435 transitions. [2021-05-22 02:34:41,556 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:41,556 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1435 transitions. [2021-05-22 02:34:41,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:41,557 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:41,557 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:41,757 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6270,1081 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:41,757 INFO L430 AbstractCegarLoop]: === Iteration 1093 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:41,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:41,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1489336201, now seen corresponding path program 1081 times [2021-05-22 02:34:41,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:41,758 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [257983161] [2021-05-22 02:34:41,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:41,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:41,828 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:41,828 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:41,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [257983161] [2021-05-22 02:34:41,828 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [257983161] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:41,828 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426282621] [2021-05-22 02:34:41,828 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1082 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1082 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:41,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:41,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:41,855 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:41,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:41,897 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:41,900 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,908 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:41,909 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:41,909 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:41,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:41,946 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,949 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:41,949 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:41,949 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:41,949 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:12 [2021-05-22 02:34:41,962 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:41,962 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426282621] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:41,962 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:41,962 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:41,962 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393482946] [2021-05-22 02:34:41,963 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:41,963 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:41,963 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:41,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:41,963 INFO L87 Difference]: Start difference. First operand 458 states and 1435 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:42,114 INFO L93 Difference]: Finished difference Result 668 states and 2020 transitions. [2021-05-22 02:34:42,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:42,115 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:42,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:42,116 INFO L225 Difference]: With dead ends: 668 [2021-05-22 02:34:42,116 INFO L226 Difference]: Without dead ends: 646 [2021-05-22 02:34:42,116 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 143.0ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:42,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2021-05-22 02:34:42,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 466. [2021-05-22 02:34:42,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1333333333333333) internal successors, (1457), 465 states have internal predecessors, (1457), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1457 transitions. [2021-05-22 02:34:42,121 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1457 transitions. Word has length 21 [2021-05-22 02:34:42,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:42,121 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1457 transitions. [2021-05-22 02:34:42,121 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,121 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1457 transitions. [2021-05-22 02:34:42,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:42,121 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:42,121 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:42,322 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1082 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6273 [2021-05-22 02:34:42,322 INFO L430 AbstractCegarLoop]: === Iteration 1094 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:42,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:42,322 INFO L82 PathProgramCache]: Analyzing trace with hash -864012083, now seen corresponding path program 1082 times [2021-05-22 02:34:42,322 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:42,322 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858443990] [2021-05-22 02:34:42,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:42,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:42,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:42,397 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:42,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858443990] [2021-05-22 02:34:42,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858443990] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:42,397 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1340615902] [2021-05-22 02:34:42,397 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1083 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1083 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:42,423 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:42,423 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:42,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:42,424 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:42,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:42,456 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:42,461 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:42,461 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:42,461 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:34:42,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:42,498 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:42,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:42,499 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:42,505 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:42,505 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:42,506 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:42,506 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:39, output treesize:13 [2021-05-22 02:34:42,549 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:42,549 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1340615902] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:42,549 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:42,549 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:42,549 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1339610329] [2021-05-22 02:34:42,549 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:42,549 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:42,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:42,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:42,550 INFO L87 Difference]: Start difference. First operand 466 states and 1457 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:42,917 INFO L93 Difference]: Finished difference Result 807 states and 2429 transitions. [2021-05-22 02:34:42,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:34:42,917 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:42,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:42,918 INFO L225 Difference]: With dead ends: 807 [2021-05-22 02:34:42,918 INFO L226 Difference]: Without dead ends: 780 [2021-05-22 02:34:42,919 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 265.5ms TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:34:42,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 780 states. [2021-05-22 02:34:42,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 780 to 466. [2021-05-22 02:34:42,923 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.129032258064516) internal successors, (1455), 465 states have internal predecessors, (1455), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1455 transitions. [2021-05-22 02:34:42,924 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1455 transitions. Word has length 21 [2021-05-22 02:34:42,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:42,924 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1455 transitions. [2021-05-22 02:34:42,924 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:42,924 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1455 transitions. [2021-05-22 02:34:42,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:42,925 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:42,925 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:43,125 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6276,1083 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:43,125 INFO L430 AbstractCegarLoop]: === Iteration 1095 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:43,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:43,125 INFO L82 PathProgramCache]: Analyzing trace with hash -1148274767, now seen corresponding path program 1083 times [2021-05-22 02:34:43,125 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:43,125 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1208737302] [2021-05-22 02:34:43,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:43,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:43,203 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:43,203 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:43,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1208737302] [2021-05-22 02:34:43,203 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1208737302] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:43,203 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [844512048] [2021-05-22 02:34:43,203 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1084 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1084 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:43,229 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:43,229 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:43,230 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:43,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:43,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:43,269 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:43,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:43,271 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:43,279 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:43,279 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:43,279 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:43,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:43,335 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:43,342 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:43,342 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:43,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:43,344 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:43,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:43,350 INFO L518 ElimStorePlain]: Eliminatee v_prenex_326 vanished before elimination [2021-05-22 02:34:43,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:43,350 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:37, output treesize:13 [2021-05-22 02:34:43,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:43,397 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [844512048] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:43,397 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:43,397 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:43,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21376293] [2021-05-22 02:34:43,397 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:43,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:43,398 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:43,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:43,398 INFO L87 Difference]: Start difference. First operand 466 states and 1455 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:43,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:43,852 INFO L93 Difference]: Finished difference Result 730 states and 2233 transitions. [2021-05-22 02:34:43,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:43,852 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:43,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:43,853 INFO L225 Difference]: With dead ends: 730 [2021-05-22 02:34:43,853 INFO L226 Difference]: Without dead ends: 703 [2021-05-22 02:34:43,853 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 288.7ms TimeCoverageRelationStatistics Valid=115, Invalid=485, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:43,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-05-22 02:34:43,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 471. [2021-05-22 02:34:43,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 471 states, 470 states have (on average 3.1319148936170214) internal successors, (1472), 470 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:43,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 471 states to 471 states and 1472 transitions. [2021-05-22 02:34:43,859 INFO L78 Accepts]: Start accepts. Automaton has 471 states and 1472 transitions. Word has length 21 [2021-05-22 02:34:43,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:43,859 INFO L482 AbstractCegarLoop]: Abstraction has 471 states and 1472 transitions. [2021-05-22 02:34:43,859 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:43,859 INFO L276 IsEmpty]: Start isEmpty. Operand 471 states and 1472 transitions. [2021-05-22 02:34:43,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:43,860 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:43,860 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:44,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1084 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6279 [2021-05-22 02:34:44,060 INFO L430 AbstractCegarLoop]: === Iteration 1096 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:44,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:44,060 INFO L82 PathProgramCache]: Analyzing trace with hash 538117073, now seen corresponding path program 1084 times [2021-05-22 02:34:44,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:44,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014803192] [2021-05-22 02:34:44,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:44,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:44,142 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:44,142 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:44,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014803192] [2021-05-22 02:34:44,142 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014803192] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:44,142 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1178054358] [2021-05-22 02:34:44,142 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1085 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1085 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:44,167 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:44,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:44,168 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:44,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:44,207 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:44,208 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:44,210 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:44,210 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:44,219 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:44,219 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:44,219 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:44,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:44,274 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:44,277 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:44,277 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:44,277 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:44,277 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:44,305 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:44,305 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1178054358] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:44,305 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:44,305 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:44,305 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [755962611] [2021-05-22 02:34:44,305 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:44,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:44,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:44,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:44,305 INFO L87 Difference]: Start difference. First operand 471 states and 1472 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:44,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:44,669 INFO L93 Difference]: Finished difference Result 669 states and 2050 transitions. [2021-05-22 02:34:44,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:44,669 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:44,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:44,670 INFO L225 Difference]: With dead ends: 669 [2021-05-22 02:34:44,670 INFO L226 Difference]: Without dead ends: 648 [2021-05-22 02:34:44,670 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 275.5ms TimeCoverageRelationStatistics Valid=104, Invalid=448, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:44,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 648 states. [2021-05-22 02:34:44,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 648 to 470. [2021-05-22 02:34:44,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.138592750533049) internal successors, (1472), 469 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:44,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1472 transitions. [2021-05-22 02:34:44,675 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1472 transitions. Word has length 21 [2021-05-22 02:34:44,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:44,675 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1472 transitions. [2021-05-22 02:34:44,675 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:44,675 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1472 transitions. [2021-05-22 02:34:44,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:44,676 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:44,676 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:44,876 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6291,1085 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:44,876 INFO L430 AbstractCegarLoop]: === Iteration 1097 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:44,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:44,876 INFO L82 PathProgramCache]: Analyzing trace with hash 560621445, now seen corresponding path program 1085 times [2021-05-22 02:34:44,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:44,877 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053031334] [2021-05-22 02:34:44,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:44,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:44,945 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:44,945 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:44,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053031334] [2021-05-22 02:34:44,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053031334] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:44,945 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1805160855] [2021-05-22 02:34:44,945 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1086 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1086 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:44,972 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:34:44,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:44,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:44,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:45,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:45,010 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:45,012 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:45,022 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:45,022 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:45,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:45,048 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,058 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:45,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:45,060 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,068 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:45,069 INFO L518 ElimStorePlain]: Eliminatee v_prenex_328 vanished before elimination [2021-05-22 02:34:45,069 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:45,069 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:45,069 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:45,103 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:45,103 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1805160855] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:45,103 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:45,103 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:45,103 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690390511] [2021-05-22 02:34:45,103 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:45,103 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:45,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:45,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:45,103 INFO L87 Difference]: Start difference. First operand 470 states and 1472 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:45,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:45,327 INFO L93 Difference]: Finished difference Result 719 states and 2182 transitions. [2021-05-22 02:34:45,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:45,327 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:45,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:45,328 INFO L225 Difference]: With dead ends: 719 [2021-05-22 02:34:45,328 INFO L226 Difference]: Without dead ends: 690 [2021-05-22 02:34:45,328 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 160.1ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:45,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 690 states. [2021-05-22 02:34:45,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 690 to 470. [2021-05-22 02:34:45,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.138592750533049) internal successors, (1472), 469 states have internal predecessors, (1472), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:45,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1472 transitions. [2021-05-22 02:34:45,334 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1472 transitions. Word has length 21 [2021-05-22 02:34:45,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:45,334 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1472 transitions. [2021-05-22 02:34:45,334 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:45,334 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1472 transitions. [2021-05-22 02:34:45,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:45,334 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:45,334 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:45,534 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1086 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6298 [2021-05-22 02:34:45,535 INFO L430 AbstractCegarLoop]: === Iteration 1098 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:45,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:45,535 INFO L82 PathProgramCache]: Analyzing trace with hash 857887855, now seen corresponding path program 1086 times [2021-05-22 02:34:45,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:45,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [21609462] [2021-05-22 02:34:45,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:45,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:45,614 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:45,614 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:45,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [21609462] [2021-05-22 02:34:45,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [21609462] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:45,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [406557012] [2021-05-22 02:34:45,614 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1087 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1087 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:45,639 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:45,639 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:45,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:45,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:45,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:45,673 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,677 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:45,678 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,678 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:21 [2021-05-22 02:34:45,699 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:45,700 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,701 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 9 [2021-05-22 02:34:45,702 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:45,710 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:45,710 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:45,710 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:45,711 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:45, output treesize:19 [2021-05-22 02:34:45,779 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:45,780 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [406557012] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:45,780 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:45,780 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:45,780 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010297964] [2021-05-22 02:34:45,780 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:45,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:45,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:45,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:45,780 INFO L87 Difference]: Start difference. First operand 470 states and 1472 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:46,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:46,289 INFO L93 Difference]: Finished difference Result 837 states and 2519 transitions. [2021-05-22 02:34:46,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:34:46,290 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:46,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:46,291 INFO L225 Difference]: With dead ends: 837 [2021-05-22 02:34:46,291 INFO L226 Difference]: Without dead ends: 814 [2021-05-22 02:34:46,291 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 406.1ms TimeCoverageRelationStatistics Valid=147, Invalid=609, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:34:46,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 814 states. [2021-05-22 02:34:46,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 814 to 469. [2021-05-22 02:34:46,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.1474358974358974) internal successors, (1473), 468 states have internal predecessors, (1473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:46,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1473 transitions. [2021-05-22 02:34:46,296 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1473 transitions. Word has length 21 [2021-05-22 02:34:46,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:46,297 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1473 transitions. [2021-05-22 02:34:46,297 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:46,297 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1473 transitions. [2021-05-22 02:34:46,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:46,297 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:46,297 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:46,497 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6303,1087 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:46,498 INFO L430 AbstractCegarLoop]: === Iteration 1099 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:46,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:46,498 INFO L82 PathProgramCache]: Analyzing trace with hash 573625171, now seen corresponding path program 1087 times [2021-05-22 02:34:46,498 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:46,498 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1701294063] [2021-05-22 02:34:46,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:46,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:46,582 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:46,583 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:46,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1701294063] [2021-05-22 02:34:46,583 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1701294063] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:46,583 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253182655] [2021-05-22 02:34:46,583 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1088 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1088 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:46,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:46,608 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:46,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:46,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:46,648 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:46,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:46,650 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:46,659 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:46,659 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:46,660 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:46,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:46,685 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:46,695 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:46,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:46,698 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:46,706 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:46,706 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:46,706 INFO L518 ElimStorePlain]: Eliminatee v_prenex_330 vanished before elimination [2021-05-22 02:34:46,707 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:46,707 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:46,778 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:46,778 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [253182655] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:46,778 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:46,778 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:46,778 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198780174] [2021-05-22 02:34:46,779 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:46,779 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:46,779 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:46,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:46,779 INFO L87 Difference]: Start difference. First operand 469 states and 1473 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:47,160 INFO L93 Difference]: Finished difference Result 754 states and 2295 transitions. [2021-05-22 02:34:47,160 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:47,160 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:47,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:47,161 INFO L225 Difference]: With dead ends: 754 [2021-05-22 02:34:47,161 INFO L226 Difference]: Without dead ends: 727 [2021-05-22 02:34:47,161 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 310.7ms TimeCoverageRelationStatistics Valid=122, Invalid=478, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:47,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 727 states. [2021-05-22 02:34:47,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 727 to 468. [2021-05-22 02:34:47,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 467 states have (on average 3.1413276231263385) internal successors, (1467), 467 states have internal predecessors, (1467), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1467 transitions. [2021-05-22 02:34:47,166 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1467 transitions. Word has length 21 [2021-05-22 02:34:47,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:47,166 INFO L482 AbstractCegarLoop]: Abstraction has 468 states and 1467 transitions. [2021-05-22 02:34:47,166 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,167 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1467 transitions. [2021-05-22 02:34:47,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:47,167 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:47,167 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:47,367 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1088 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6309 [2021-05-22 02:34:47,368 INFO L430 AbstractCegarLoop]: === Iteration 1100 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:47,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:47,368 INFO L82 PathProgramCache]: Analyzing trace with hash -1645652335, now seen corresponding path program 1088 times [2021-05-22 02:34:47,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:47,368 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953032833] [2021-05-22 02:34:47,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:47,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:47,453 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:47,454 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:47,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953032833] [2021-05-22 02:34:47,454 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953032833] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:47,454 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370355453] [2021-05-22 02:34:47,454 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1089 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1089 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:47,479 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:47,479 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:47,480 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:47,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:47,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:47,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:47,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:47,523 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:47,538 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:47,538 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:47,538 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:47,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:47,573 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:47,577 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:47,577 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:47,577 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:47,577 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:47,620 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:47,620 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370355453] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:47,620 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:47,621 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:47,621 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1313401646] [2021-05-22 02:34:47,621 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:47,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:47,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:47,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:47,621 INFO L87 Difference]: Start difference. First operand 468 states and 1467 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:47,971 INFO L93 Difference]: Finished difference Result 682 states and 2091 transitions. [2021-05-22 02:34:47,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:47,972 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:47,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:47,972 INFO L225 Difference]: With dead ends: 682 [2021-05-22 02:34:47,972 INFO L226 Difference]: Without dead ends: 661 [2021-05-22 02:34:47,973 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 257.9ms TimeCoverageRelationStatistics Valid=106, Invalid=446, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:47,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2021-05-22 02:34:47,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 463. [2021-05-22 02:34:47,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1277056277056277) internal successors, (1445), 462 states have internal predecessors, (1445), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1445 transitions. [2021-05-22 02:34:47,978 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1445 transitions. Word has length 21 [2021-05-22 02:34:47,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:47,978 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1445 transitions. [2021-05-22 02:34:47,978 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:47,978 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1445 transitions. [2021-05-22 02:34:47,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:47,978 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:47,978 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:48,179 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1089 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6321 [2021-05-22 02:34:48,179 INFO L430 AbstractCegarLoop]: === Iteration 1101 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:48,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:48,179 INFO L82 PathProgramCache]: Analyzing trace with hash -2037100907, now seen corresponding path program 1089 times [2021-05-22 02:34:48,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:48,179 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246655974] [2021-05-22 02:34:48,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:48,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:48,248 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:48,248 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:48,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246655974] [2021-05-22 02:34:48,248 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246655974] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:48,248 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2052139409] [2021-05-22 02:34:48,248 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1090 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1090 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:48,275 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:48,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:48,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:48,276 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:48,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:48,310 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,314 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:48,315 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,315 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:28, output treesize:20 [2021-05-22 02:34:48,336 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:34:48,337 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,338 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:34:48,339 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,347 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:48,347 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:48,348 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:48,348 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:48,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:48,381 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2052139409] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:48,381 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:48,382 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:48,382 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424605220] [2021-05-22 02:34:48,382 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:48,382 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:48,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:48,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:48,382 INFO L87 Difference]: Start difference. First operand 463 states and 1445 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:48,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:48,612 INFO L93 Difference]: Finished difference Result 688 states and 2078 transitions. [2021-05-22 02:34:48,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:48,612 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:48,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:48,613 INFO L225 Difference]: With dead ends: 688 [2021-05-22 02:34:48,613 INFO L226 Difference]: Without dead ends: 652 [2021-05-22 02:34:48,613 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 144.8ms TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:48,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 652 states. [2021-05-22 02:34:48,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 652 to 464. [2021-05-22 02:34:48,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1317494600431965) internal successors, (1450), 463 states have internal predecessors, (1450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:48,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1450 transitions. [2021-05-22 02:34:48,618 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1450 transitions. Word has length 21 [2021-05-22 02:34:48,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:48,618 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1450 transitions. [2021-05-22 02:34:48,618 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:48,619 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1450 transitions. [2021-05-22 02:34:48,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:48,619 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:48,619 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:48,819 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6325,1090 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:48,820 INFO L430 AbstractCegarLoop]: === Iteration 1102 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:48,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:48,820 INFO L82 PathProgramCache]: Analyzing trace with hash -1739834497, now seen corresponding path program 1090 times [2021-05-22 02:34:48,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:48,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101090037] [2021-05-22 02:34:48,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:48,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:48,899 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:48,899 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:48,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101090037] [2021-05-22 02:34:48,899 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [101090037] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:48,899 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [169481713] [2021-05-22 02:34:48,899 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1091 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1091 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:48,925 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:48,925 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:48,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:48,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:48,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:48,964 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,965 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:48,966 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:48,975 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:48,975 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:48,975 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:49,001 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:49,002 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:49,018 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:49,018 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:49,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:49,020 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:49,029 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:49,029 INFO L518 ElimStorePlain]: Eliminatee v_prenex_332 vanished before elimination [2021-05-22 02:34:49,029 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:49,029 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:49,099 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:49,099 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [169481713] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:49,099 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:49,099 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:49,099 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468821756] [2021-05-22 02:34:49,099 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:49,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:49,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:49,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=223, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:49,100 INFO L87 Difference]: Start difference. First operand 464 states and 1450 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:49,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:49,588 INFO L93 Difference]: Finished difference Result 836 states and 2505 transitions. [2021-05-22 02:34:49,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:34:49,588 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:49,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:49,589 INFO L225 Difference]: With dead ends: 836 [2021-05-22 02:34:49,589 INFO L226 Difference]: Without dead ends: 813 [2021-05-22 02:34:49,589 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 385.6ms TimeCoverageRelationStatistics Valid=139, Invalid=563, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:34:49,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 813 states. [2021-05-22 02:34:49,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 813 to 479. [2021-05-22 02:34:49,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 479 states, 478 states have (on average 3.1485355648535567) internal successors, (1505), 478 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:49,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 479 states to 479 states and 1505 transitions. [2021-05-22 02:34:49,595 INFO L78 Accepts]: Start accepts. Automaton has 479 states and 1505 transitions. Word has length 21 [2021-05-22 02:34:49,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:49,595 INFO L482 AbstractCegarLoop]: Abstraction has 479 states and 1505 transitions. [2021-05-22 02:34:49,595 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:49,595 INFO L276 IsEmpty]: Start isEmpty. Operand 479 states and 1505 transitions. [2021-05-22 02:34:49,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:49,596 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:49,596 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:49,796 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6328,1091 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:49,796 INFO L430 AbstractCegarLoop]: === Iteration 1103 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:49,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:49,797 INFO L82 PathProgramCache]: Analyzing trace with hash -2024097181, now seen corresponding path program 1091 times [2021-05-22 02:34:49,797 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:49,797 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2090384392] [2021-05-22 02:34:49,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:49,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:49,874 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:49,875 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:49,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2090384392] [2021-05-22 02:34:49,875 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2090384392] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:49,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1479941224] [2021-05-22 02:34:49,875 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1092 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1092 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:49,900 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:34:49,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:49,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:49,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:49,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:49,940 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:49,942 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:49,942 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:49,951 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:49,951 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:49,951 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:49,977 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:49,978 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:49,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:49,981 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:50,009 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:50,010 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:50,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:50,013 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:50,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:50,015 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:50,039 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:50,040 INFO L518 ElimStorePlain]: Eliminatee v_prenex_334 vanished before elimination [2021-05-22 02:34:50,040 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:34:50,040 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 4 variables, input treesize:105, output treesize:57 [2021-05-22 02:34:50,152 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:50,152 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1479941224] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:50,152 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:50,152 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:34:50,152 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134453905] [2021-05-22 02:34:50,152 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:34:50,152 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:50,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:34:50,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=222, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:50,153 INFO L87 Difference]: Start difference. First operand 479 states and 1505 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:50,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:50,738 INFO L93 Difference]: Finished difference Result 760 states and 2345 transitions. [2021-05-22 02:34:50,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:34:50,739 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:50,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:50,740 INFO L225 Difference]: With dead ends: 760 [2021-05-22 02:34:50,740 INFO L226 Difference]: Without dead ends: 712 [2021-05-22 02:34:50,740 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 558.0ms TimeCoverageRelationStatistics Valid=156, Invalid=600, Unknown=0, NotChecked=0, Total=756 [2021-05-22 02:34:50,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 712 states. [2021-05-22 02:34:50,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 712 to 485. [2021-05-22 02:34:50,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 485 states, 484 states have (on average 3.146694214876033) internal successors, (1523), 484 states have internal predecessors, (1523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:50,746 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 485 states to 485 states and 1523 transitions. [2021-05-22 02:34:50,746 INFO L78 Accepts]: Start accepts. Automaton has 485 states and 1523 transitions. Word has length 21 [2021-05-22 02:34:50,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:50,746 INFO L482 AbstractCegarLoop]: Abstraction has 485 states and 1523 transitions. [2021-05-22 02:34:50,746 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 17 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:50,746 INFO L276 IsEmpty]: Start isEmpty. Operand 485 states and 1523 transitions. [2021-05-22 02:34:50,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:50,746 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:50,746 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:50,947 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6336,1092 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:50,947 INFO L430 AbstractCegarLoop]: === Iteration 1104 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:50,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:50,947 INFO L82 PathProgramCache]: Analyzing trace with hash 310123149, now seen corresponding path program 1092 times [2021-05-22 02:34:50,947 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:50,947 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806226909] [2021-05-22 02:34:50,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:50,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:51,014 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:51,014 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:51,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806226909] [2021-05-22 02:34:51,014 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806226909] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:51,014 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991815370] [2021-05-22 02:34:51,014 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1093 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1093 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:51,040 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:34:51,040 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:51,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:51,041 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:51,078 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:51,079 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,080 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:51,081 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,089 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:51,089 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:51,090 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:51,122 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:51,123 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,126 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:51,126 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:51,127 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,127 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:51,141 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:51,141 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1991815370] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:51,141 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:51,141 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:51,141 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875098135] [2021-05-22 02:34:51,142 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:51,142 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:51,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:51,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:51,142 INFO L87 Difference]: Start difference. First operand 485 states and 1523 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:51,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:51,352 INFO L93 Difference]: Finished difference Result 694 states and 2096 transitions. [2021-05-22 02:34:51,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:51,353 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:51,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:51,353 INFO L225 Difference]: With dead ends: 694 [2021-05-22 02:34:51,354 INFO L226 Difference]: Without dead ends: 675 [2021-05-22 02:34:51,354 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 141.2ms TimeCoverageRelationStatistics Valid=56, Invalid=216, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:51,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-05-22 02:34:51,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 469. [2021-05-22 02:34:51,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 469 states, 468 states have (on average 3.138888888888889) internal successors, (1469), 468 states have internal predecessors, (1469), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:51,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 469 states to 469 states and 1469 transitions. [2021-05-22 02:34:51,359 INFO L78 Accepts]: Start accepts. Automaton has 469 states and 1469 transitions. Word has length 21 [2021-05-22 02:34:51,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:51,359 INFO L482 AbstractCegarLoop]: Abstraction has 469 states and 1469 transitions. [2021-05-22 02:34:51,359 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:51,359 INFO L276 IsEmpty]: Start isEmpty. Operand 469 states and 1469 transitions. [2021-05-22 02:34:51,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:51,359 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:51,359 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:51,559 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1093 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6349 [2021-05-22 02:34:51,560 INFO L430 AbstractCegarLoop]: === Iteration 1105 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:51,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:51,560 INFO L82 PathProgramCache]: Analyzing trace with hash 855495803, now seen corresponding path program 1093 times [2021-05-22 02:34:51,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:51,560 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [308882555] [2021-05-22 02:34:51,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:51,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:51,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:51,631 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:51,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [308882555] [2021-05-22 02:34:51,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [308882555] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:51,631 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087100309] [2021-05-22 02:34:51,631 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1094 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1094 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:51,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:51,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:51,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:51,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:51,696 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:51,699 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,707 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:51,708 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:51,708 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:51,769 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:51,770 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,772 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:51,773 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:51,773 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:51,773 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:51,782 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:51,783 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087100309] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:51,783 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:51,783 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:51,783 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540046662] [2021-05-22 02:34:51,783 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:51,783 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:51,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:51,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:51,783 INFO L87 Difference]: Start difference. First operand 469 states and 1469 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:52,049 INFO L93 Difference]: Finished difference Result 603 states and 1851 transitions. [2021-05-22 02:34:52,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:52,049 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:52,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:52,050 INFO L225 Difference]: With dead ends: 603 [2021-05-22 02:34:52,050 INFO L226 Difference]: Without dead ends: 582 [2021-05-22 02:34:52,050 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 172.5ms TimeCoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:52,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 582 states. [2021-05-22 02:34:52,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 582 to 466. [2021-05-22 02:34:52,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 466 states, 465 states have (on average 3.1440860215053763) internal successors, (1462), 465 states have internal predecessors, (1462), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 466 states to 466 states and 1462 transitions. [2021-05-22 02:34:52,055 INFO L78 Accepts]: Start accepts. Automaton has 466 states and 1462 transitions. Word has length 21 [2021-05-22 02:34:52,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:52,055 INFO L482 AbstractCegarLoop]: Abstraction has 466 states and 1462 transitions. [2021-05-22 02:34:52,055 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,055 INFO L276 IsEmpty]: Start isEmpty. Operand 466 states and 1462 transitions. [2021-05-22 02:34:52,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:52,055 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:52,055 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:52,256 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6352,1094 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:52,256 INFO L430 AbstractCegarLoop]: === Iteration 1106 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:52,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:52,256 INFO L82 PathProgramCache]: Analyzing trace with hash -863488879, now seen corresponding path program 1094 times [2021-05-22 02:34:52,256 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:52,256 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [332294390] [2021-05-22 02:34:52,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:52,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:52,335 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:52,335 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:52,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [332294390] [2021-05-22 02:34:52,335 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [332294390] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:52,335 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2085302850] [2021-05-22 02:34:52,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1095 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1095 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:52,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:52,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:52,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:52,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:52,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:52,409 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:52,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:52,411 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:52,420 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:52,420 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:52,420 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:41, output treesize:25 [2021-05-22 02:34:52,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:52,455 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:52,459 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:52,459 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:52,459 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:52,459 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:52,504 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:52,504 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2085302850] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:52,504 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:52,504 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:52,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [645030207] [2021-05-22 02:34:52,504 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:52,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:52,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:52,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:52,505 INFO L87 Difference]: Start difference. First operand 466 states and 1462 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:52,833 INFO L93 Difference]: Finished difference Result 665 states and 2040 transitions. [2021-05-22 02:34:52,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-05-22 02:34:52,833 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:52,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:52,834 INFO L225 Difference]: With dead ends: 665 [2021-05-22 02:34:52,834 INFO L226 Difference]: Without dead ends: 644 [2021-05-22 02:34:52,834 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 238.0ms TimeCoverageRelationStatistics Valid=103, Invalid=449, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:34:52,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 644 states. [2021-05-22 02:34:52,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 644 to 461. [2021-05-22 02:34:52,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 461 states, 460 states have (on average 3.130434782608696) internal successors, (1440), 460 states have internal predecessors, (1440), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 461 states to 461 states and 1440 transitions. [2021-05-22 02:34:52,840 INFO L78 Accepts]: Start accepts. Automaton has 461 states and 1440 transitions. Word has length 21 [2021-05-22 02:34:52,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:52,840 INFO L482 AbstractCegarLoop]: Abstraction has 461 states and 1440 transitions. [2021-05-22 02:34:52,840 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:52,840 INFO L276 IsEmpty]: Start isEmpty. Operand 461 states and 1440 transitions. [2021-05-22 02:34:52,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:52,840 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:52,840 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:53,041 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1095 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6359 [2021-05-22 02:34:53,041 INFO L430 AbstractCegarLoop]: === Iteration 1107 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:53,041 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:53,041 INFO L82 PathProgramCache]: Analyzing trace with hash 532898299, now seen corresponding path program 1095 times [2021-05-22 02:34:53,041 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:53,041 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63587552] [2021-05-22 02:34:53,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:53,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:53,121 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:53,122 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:53,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63587552] [2021-05-22 02:34:53,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [63587552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:53,122 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412436] [2021-05-22 02:34:53,122 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1096 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1096 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:53,147 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:34:53,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:53,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:53,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:53,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:53,207 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,210 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:53,210 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,211 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:53,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:53,246 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,248 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:53,248 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:53,249 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,249 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:53,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:53,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412436] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:53,277 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:53,277 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:53,277 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562698403] [2021-05-22 02:34:53,277 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:53,277 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:53,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:53,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:53,278 INFO L87 Difference]: Start difference. First operand 461 states and 1440 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:53,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:53,584 INFO L93 Difference]: Finished difference Result 686 states and 2103 transitions. [2021-05-22 02:34:53,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:53,585 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:53,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:53,586 INFO L225 Difference]: With dead ends: 686 [2021-05-22 02:34:53,586 INFO L226 Difference]: Without dead ends: 665 [2021-05-22 02:34:53,586 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 249.5ms TimeCoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:34:53,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 665 states. [2021-05-22 02:34:53,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 665 to 467. [2021-05-22 02:34:53,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.1351931330472103) internal successors, (1461), 466 states have internal predecessors, (1461), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:53,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1461 transitions. [2021-05-22 02:34:53,591 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1461 transitions. Word has length 21 [2021-05-22 02:34:53,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:53,591 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1461 transitions. [2021-05-22 02:34:53,591 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:53,591 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1461 transitions. [2021-05-22 02:34:53,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:53,591 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:53,592 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:53,792 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6363,1096 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:53,792 INFO L430 AbstractCegarLoop]: === Iteration 1108 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:53,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:53,792 INFO L82 PathProgramCache]: Analyzing trace with hash -797029863, now seen corresponding path program 1096 times [2021-05-22 02:34:53,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:53,792 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621936721] [2021-05-22 02:34:53,792 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:53,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:53,865 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:53,865 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:53,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621936721] [2021-05-22 02:34:53,865 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621936721] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:53,865 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1517368638] [2021-05-22 02:34:53,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1097 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1097 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:53,889 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:53,890 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:53,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:53,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:53,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:53,949 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,953 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:53,953 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,953 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:53,969 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:53,969 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:53,973 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:34:53,973 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:53,973 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:53,989 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:53,989 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1517368638] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:53,989 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:53,989 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:53,989 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69502631] [2021-05-22 02:34:53,989 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:53,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:53,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:53,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:53,990 INFO L87 Difference]: Start difference. First operand 467 states and 1461 transitions. Second operand has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:54,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:54,145 INFO L93 Difference]: Finished difference Result 586 states and 1805 transitions. [2021-05-22 02:34:54,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:54,145 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:54,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:54,146 INFO L225 Difference]: With dead ends: 586 [2021-05-22 02:34:54,146 INFO L226 Difference]: Without dead ends: 565 [2021-05-22 02:34:54,146 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 132.1ms TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:54,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-05-22 02:34:54,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 464. [2021-05-22 02:34:54,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.1295896328293735) internal successors, (1449), 463 states have internal predecessors, (1449), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:54,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1449 transitions. [2021-05-22 02:34:54,151 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1449 transitions. Word has length 21 [2021-05-22 02:34:54,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:54,151 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1449 transitions. [2021-05-22 02:34:54,151 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 15 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:54,151 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1449 transitions. [2021-05-22 02:34:54,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:54,152 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:54,152 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:54,352 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1097 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6366 [2021-05-22 02:34:54,352 INFO L430 AbstractCegarLoop]: === Iteration 1109 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:54,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:54,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1712111351, now seen corresponding path program 1097 times [2021-05-22 02:34:54,353 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:54,353 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357150763] [2021-05-22 02:34:54,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:54,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:54,434 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:54,434 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:54,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357150763] [2021-05-22 02:34:54,434 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357150763] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:54,434 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660249357] [2021-05-22 02:34:54,434 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1098 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1098 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:54,460 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:34:54,461 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:54,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:54,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:54,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:54,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:54,525 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:54,525 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:54,525 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:34:54,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:54,543 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:54,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:54,545 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:54,559 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:54,559 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:54,560 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:54,560 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:34:54,635 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:54,636 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660249357] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:54,636 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:54,636 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 18 [2021-05-22 02:34:54,636 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422642743] [2021-05-22 02:34:54,636 INFO L462 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-22 02:34:54,636 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:54,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-22 02:34:54,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:54,636 INFO L87 Difference]: Start difference. First operand 464 states and 1449 transitions. Second operand has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:55,025 INFO L93 Difference]: Finished difference Result 675 states and 2082 transitions. [2021-05-22 02:34:55,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:34:55,025 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:55,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:55,026 INFO L225 Difference]: With dead ends: 675 [2021-05-22 02:34:55,026 INFO L226 Difference]: Without dead ends: 654 [2021-05-22 02:34:55,026 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 13 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 321.9ms TimeCoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2021-05-22 02:34:55,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 654 states. [2021-05-22 02:34:55,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 654 to 459. [2021-05-22 02:34:55,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 459 states, 458 states have (on average 3.126637554585153) internal successors, (1432), 458 states have internal predecessors, (1432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 459 states to 459 states and 1432 transitions. [2021-05-22 02:34:55,031 INFO L78 Accepts]: Start accepts. Automaton has 459 states and 1432 transitions. Word has length 21 [2021-05-22 02:34:55,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:55,031 INFO L482 AbstractCegarLoop]: Abstraction has 459 states and 1432 transitions. [2021-05-22 02:34:55,032 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 18 states, 18 states have (on average 2.0) internal successors, (36), 18 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,032 INFO L276 IsEmpty]: Start isEmpty. Operand 459 states and 1432 transitions. [2021-05-22 02:34:55,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:55,032 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:55,032 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:55,232 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6369,1098 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:55,233 INFO L430 AbstractCegarLoop]: === Iteration 1110 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:55,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:55,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1050995239, now seen corresponding path program 1098 times [2021-05-22 02:34:55,233 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:55,233 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106724139] [2021-05-22 02:34:55,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:55,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:55,299 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:55,299 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:55,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106724139] [2021-05-22 02:34:55,299 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106724139] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:55,299 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [474136081] [2021-05-22 02:34:55,299 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1099 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1099 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:55,327 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:34:55,327 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:55,327 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:55,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:55,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:55,351 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,355 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:55,355 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,356 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:25, output treesize:17 [2021-05-22 02:34:55,379 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-05-22 02:34:55,380 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-05-22 02:34:55,382 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,391 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:55,391 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:55,392 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:55,392 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:21 [2021-05-22 02:34:55,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:55,427 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [474136081] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:55,427 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:55,427 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:34:55,427 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490500011] [2021-05-22 02:34:55,427 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:34:55,427 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:55,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:34:55,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:34:55,427 INFO L87 Difference]: Start difference. First operand 459 states and 1432 transitions. Second operand has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:55,636 INFO L93 Difference]: Finished difference Result 726 states and 2175 transitions. [2021-05-22 02:34:55,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:55,636 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:55,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:55,637 INFO L225 Difference]: With dead ends: 726 [2021-05-22 02:34:55,637 INFO L226 Difference]: Without dead ends: 679 [2021-05-22 02:34:55,637 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 143.3ms TimeCoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:34:55,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 679 states. [2021-05-22 02:34:55,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 679 to 463. [2021-05-22 02:34:55,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 462 states have (on average 3.1147186147186146) internal successors, (1439), 462 states have internal predecessors, (1439), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1439 transitions. [2021-05-22 02:34:55,642 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1439 transitions. Word has length 21 [2021-05-22 02:34:55,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:55,642 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1439 transitions. [2021-05-22 02:34:55,642 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.8461538461538463) internal successors, (24), 13 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:55,642 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1439 transitions. [2021-05-22 02:34:55,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:55,643 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:55,643 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:55,843 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1099 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6375 [2021-05-22 02:34:55,843 INFO L430 AbstractCegarLoop]: === Iteration 1111 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:55,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:55,844 INFO L82 PathProgramCache]: Analyzing trace with hash 1348261649, now seen corresponding path program 1099 times [2021-05-22 02:34:55,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:55,844 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215509607] [2021-05-22 02:34:55,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:55,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:55,913 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:55,913 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:55,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215509607] [2021-05-22 02:34:55,913 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1215509607] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:55,913 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504778200] [2021-05-22 02:34:55,914 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:55,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:55,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:55,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:55,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:55,964 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:55,967 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:55,973 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:55,973 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:55,973 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:56,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:56,010 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:56,013 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,021 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:56,021 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:56,022 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:56,022 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:56,072 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:56,072 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1504778200] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:56,072 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:56,072 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:34:56,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302716973] [2021-05-22 02:34:56,072 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:34:56,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:56,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:34:56,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:56,073 INFO L87 Difference]: Start difference. First operand 463 states and 1439 transitions. Second operand has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:56,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:56,381 INFO L93 Difference]: Finished difference Result 822 states and 2446 transitions. [2021-05-22 02:34:56,382 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:34:56,382 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:56,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:56,383 INFO L225 Difference]: With dead ends: 822 [2021-05-22 02:34:56,383 INFO L226 Difference]: Without dead ends: 799 [2021-05-22 02:34:56,383 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 256.2ms TimeCoverageRelationStatistics Valid=88, Invalid=292, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:34:56,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-05-22 02:34:56,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 488. [2021-05-22 02:34:56,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 488 states, 487 states have (on average 3.137577002053388) internal successors, (1528), 487 states have internal predecessors, (1528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:56,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 488 states to 488 states and 1528 transitions. [2021-05-22 02:34:56,389 INFO L78 Accepts]: Start accepts. Automaton has 488 states and 1528 transitions. Word has length 21 [2021-05-22 02:34:56,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:56,389 INFO L482 AbstractCegarLoop]: Abstraction has 488 states and 1528 transitions. [2021-05-22 02:34:56,389 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8) internal successors, (27), 15 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:56,389 INFO L276 IsEmpty]: Start isEmpty. Operand 488 states and 1528 transitions. [2021-05-22 02:34:56,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:56,390 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:56,390 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:56,590 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1100 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6378 [2021-05-22 02:34:56,590 INFO L430 AbstractCegarLoop]: === Iteration 1112 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:56,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:56,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1063998965, now seen corresponding path program 1100 times [2021-05-22 02:34:56,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:56,590 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [344254776] [2021-05-22 02:34:56,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:56,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:56,666 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:56,666 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:56,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [344254776] [2021-05-22 02:34:56,666 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [344254776] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:56,666 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [216313526] [2021-05-22 02:34:56,666 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1101 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:56,692 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:34:56,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:56,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:56,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:56,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:56,720 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:56,722 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,728 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:56,729 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:56,729 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:56,752 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:56,753 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:56,755 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:56,763 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:56,763 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:56,764 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:56,764 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:43, output treesize:19 [2021-05-22 02:34:56,842 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:56,842 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [216313526] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:56,842 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:56,842 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:34:56,842 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [224005325] [2021-05-22 02:34:56,842 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:34:56,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:56,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:34:56,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:56,843 INFO L87 Difference]: Start difference. First operand 488 states and 1528 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:57,189 INFO L93 Difference]: Finished difference Result 846 states and 2583 transitions. [2021-05-22 02:34:57,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:34:57,189 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:57,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:57,191 INFO L225 Difference]: With dead ends: 846 [2021-05-22 02:34:57,191 INFO L226 Difference]: Without dead ends: 819 [2021-05-22 02:34:57,191 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 283.2ms TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:34:57,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 819 states. [2021-05-22 02:34:57,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 819 to 501. [2021-05-22 02:34:57,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 500 states have (on average 3.148) internal successors, (1574), 500 states have internal predecessors, (1574), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 1574 transitions. [2021-05-22 02:34:57,197 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 1574 transitions. Word has length 21 [2021-05-22 02:34:57,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:57,197 INFO L482 AbstractCegarLoop]: Abstraction has 501 states and 1574 transitions. [2021-05-22 02:34:57,197 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,197 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 1574 transitions. [2021-05-22 02:34:57,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:57,198 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:57,198 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:57,398 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1101 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6385 [2021-05-22 02:34:57,398 INFO L430 AbstractCegarLoop]: === Iteration 1113 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:57,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:57,399 INFO L82 PathProgramCache]: Analyzing trace with hash -896748001, now seen corresponding path program 1101 times [2021-05-22 02:34:57,399 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:57,399 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870554482] [2021-05-22 02:34:57,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:57,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:57,467 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:57,467 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:57,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870554482] [2021-05-22 02:34:57,467 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870554482] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:57,467 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [788668006] [2021-05-22 02:34:57,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:57,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:34:57,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:57,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:57,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:57,520 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:57,521 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:57,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:57,523 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:57,529 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:57,530 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:57,530 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:57,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:57,578 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:57,581 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:57,582 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:57,582 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:57,582 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:34:57,597 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:57,597 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [788668006] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:57,597 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:57,597 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:57,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461637625] [2021-05-22 02:34:57,597 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:57,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:57,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:57,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:57,598 INFO L87 Difference]: Start difference. First operand 501 states and 1574 transitions. Second operand has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:57,797 INFO L93 Difference]: Finished difference Result 816 states and 2447 transitions. [2021-05-22 02:34:57,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:57,797 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:57,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:57,799 INFO L225 Difference]: With dead ends: 816 [2021-05-22 02:34:57,799 INFO L226 Difference]: Without dead ends: 797 [2021-05-22 02:34:57,799 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 17 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 167.9ms TimeCoverageRelationStatistics Valid=72, Invalid=234, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:57,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 797 states. [2021-05-22 02:34:57,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 797 to 499. [2021-05-22 02:34:57,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 499 states, 498 states have (on average 3.1506024096385543) internal successors, (1569), 498 states have internal predecessors, (1569), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 499 states to 499 states and 1569 transitions. [2021-05-22 02:34:57,805 INFO L78 Accepts]: Start accepts. Automaton has 499 states and 1569 transitions. Word has length 21 [2021-05-22 02:34:57,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:57,805 INFO L482 AbstractCegarLoop]: Abstraction has 499 states and 1569 transitions. [2021-05-22 02:34:57,805 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.7857142857142858) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:57,805 INFO L276 IsEmpty]: Start isEmpty. Operand 499 states and 1569 transitions. [2021-05-22 02:34:57,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:57,805 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:57,806 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:58,006 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1102 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6396 [2021-05-22 02:34:58,006 INFO L430 AbstractCegarLoop]: === Iteration 1114 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:58,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:58,006 INFO L82 PathProgramCache]: Analyzing trace with hash -351375347, now seen corresponding path program 1102 times [2021-05-22 02:34:58,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:58,006 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211629785] [2021-05-22 02:34:58,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:58,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:58,083 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:58,083 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:58,083 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211629785] [2021-05-22 02:34:58,083 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211629785] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:58,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [543997960] [2021-05-22 02:34:58,084 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1103 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:58,121 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:34:58,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:58,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:58,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:58,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:58,153 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:58,155 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,163 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:58,163 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:58,163 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:58,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:58,221 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,223 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:58,223 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:58,224 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,224 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:58,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:58,234 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [543997960] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:58,234 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:58,234 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 14 [2021-05-22 02:34:58,234 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728328371] [2021-05-22 02:34:58,234 INFO L462 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-22 02:34:58,234 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:58,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-22 02:34:58,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:34:58,234 INFO L87 Difference]: Start difference. First operand 499 states and 1569 transitions. Second operand has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:58,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:58,432 INFO L93 Difference]: Finished difference Result 748 states and 2284 transitions. [2021-05-22 02:34:58,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:58,432 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:58,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:58,433 INFO L225 Difference]: With dead ends: 748 [2021-05-22 02:34:58,433 INFO L226 Difference]: Without dead ends: 727 [2021-05-22 02:34:58,433 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 4 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 168.5ms TimeCoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:34:58,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 727 states. [2021-05-22 02:34:58,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 727 to 491. [2021-05-22 02:34:58,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 490 states have (on average 3.142857142857143) internal successors, (1540), 490 states have internal predecessors, (1540), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:58,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 1540 transitions. [2021-05-22 02:34:58,439 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 1540 transitions. Word has length 21 [2021-05-22 02:34:58,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:58,439 INFO L482 AbstractCegarLoop]: Abstraction has 491 states and 1540 transitions. [2021-05-22 02:34:58,439 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:58,439 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 1540 transitions. [2021-05-22 02:34:58,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:58,439 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:58,439 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:58,640 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1103 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6399 [2021-05-22 02:34:58,640 INFO L430 AbstractCegarLoop]: === Iteration 1115 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:58,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:58,640 INFO L82 PathProgramCache]: Analyzing trace with hash 588341325, now seen corresponding path program 1103 times [2021-05-22 02:34:58,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:58,640 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107396473] [2021-05-22 02:34:58,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:58,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:58,710 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:58,710 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:58,710 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107396473] [2021-05-22 02:34:58,710 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107396473] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:58,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [89104635] [2021-05-22 02:34:58,711 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:58,737 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-05-22 02:34:58,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:58,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:34:58,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:58,761 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:58,762 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:58,764 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,770 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:58,771 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:58,771 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:58,801 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:58,802 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,803 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:58,804 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:58,818 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:58,818 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:58,819 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:58,819 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:61, output treesize:31 [2021-05-22 02:34:58,889 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:58,890 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [89104635] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:58,890 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:58,890 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:34:58,890 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685247145] [2021-05-22 02:34:58,890 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:34:58,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:58,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:34:58,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:34:58,890 INFO L87 Difference]: Start difference. First operand 491 states and 1540 transitions. Second operand has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:59,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:59,426 INFO L93 Difference]: Finished difference Result 902 states and 2699 transitions. [2021-05-22 02:34:59,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-22 02:34:59,426 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:59,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:59,427 INFO L225 Difference]: With dead ends: 902 [2021-05-22 02:34:59,427 INFO L226 Difference]: Without dead ends: 883 [2021-05-22 02:34:59,427 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 399.3ms TimeCoverageRelationStatistics Valid=165, Invalid=537, Unknown=0, NotChecked=0, Total=702 [2021-05-22 02:34:59,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 883 states. [2021-05-22 02:34:59,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 883 to 465. [2021-05-22 02:34:59,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 465 states, 464 states have (on average 3.1293103448275863) internal successors, (1452), 464 states have internal predecessors, (1452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:59,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 465 states to 465 states and 1452 transitions. [2021-05-22 02:34:59,433 INFO L78 Accepts]: Start accepts. Automaton has 465 states and 1452 transitions. Word has length 21 [2021-05-22 02:34:59,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:34:59,433 INFO L482 AbstractCegarLoop]: Abstraction has 465 states and 1452 transitions. [2021-05-22 02:34:59,433 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.1875) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:59,433 INFO L276 IsEmpty]: Start isEmpty. Operand 465 states and 1452 transitions. [2021-05-22 02:34:59,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:34:59,434 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:34:59,434 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:34:59,634 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6404,1104 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:59,634 INFO L430 AbstractCegarLoop]: === Iteration 1116 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:34:59,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:34:59,635 INFO L82 PathProgramCache]: Analyzing trace with hash 1325837557, now seen corresponding path program 1104 times [2021-05-22 02:34:59,635 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:34:59,635 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [324822247] [2021-05-22 02:34:59,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:34:59,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:34:59,692 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:59,693 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:34:59,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [324822247] [2021-05-22 02:34:59,693 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [324822247] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:59,693 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [447082458] [2021-05-22 02:34:59,693 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1105 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:34:59,721 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:34:59,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:34:59,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:34:59,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:34:59,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:34:59,740 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:59,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:34:59,742 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:59,748 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:59,749 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:34:59,749 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:35, output treesize:19 [2021-05-22 02:34:59,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:34:59,771 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:34:59,774 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:34:59,774 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:34:59,774 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:34:59,774 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:34:59,784 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:34:59,784 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [447082458] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:34:59,784 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:34:59,784 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:34:59,784 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797365983] [2021-05-22 02:34:59,785 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:34:59,785 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:34:59,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:34:59,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:34:59,785 INFO L87 Difference]: Start difference. First operand 465 states and 1452 transitions. Second operand has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:34:59,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:34:59,995 INFO L93 Difference]: Finished difference Result 820 states and 2474 transitions. [2021-05-22 02:34:59,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:34:59,996 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:34:59,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:34:59,997 INFO L225 Difference]: With dead ends: 820 [2021-05-22 02:34:59,997 INFO L226 Difference]: Without dead ends: 799 [2021-05-22 02:34:59,997 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 121.8ms TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:34:59,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 799 states. [2021-05-22 02:35:00,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 799 to 458. [2021-05-22 02:35:00,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 458 states, 457 states have (on average 3.1269146608315097) internal successors, (1429), 457 states have internal predecessors, (1429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:00,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 458 states to 458 states and 1429 transitions. [2021-05-22 02:35:00,003 INFO L78 Accepts]: Start accepts. Automaton has 458 states and 1429 transitions. Word has length 21 [2021-05-22 02:35:00,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:00,003 INFO L482 AbstractCegarLoop]: Abstraction has 458 states and 1429 transitions. [2021-05-22 02:35:00,003 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 1.9090909090909092) internal successors, (21), 11 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:00,003 INFO L276 IsEmpty]: Start isEmpty. Operand 458 states and 1429 transitions. [2021-05-22 02:35:00,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:00,004 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:00,004 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:00,204 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1105 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6410 [2021-05-22 02:35:00,205 INFO L430 AbstractCegarLoop]: === Iteration 1117 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:00,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:00,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1211465707, now seen corresponding path program 1105 times [2021-05-22 02:35:00,205 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:00,205 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [173368108] [2021-05-22 02:35:00,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:00,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:00,277 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:00,277 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:00,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [173368108] [2021-05-22 02:35:00,277 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [173368108] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:00,277 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1306803015] [2021-05-22 02:35:00,277 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1106 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:00,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:00,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:00,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:00,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:00,341 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:00,344 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:00,345 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:00,345 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:00,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:00,373 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:00,376 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:00,376 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:00,376 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:00,376 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:35:00,403 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:00,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1306803015] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:00,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:00,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:00,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075711923] [2021-05-22 02:35:00,404 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:00,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:00,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:00,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:00,404 INFO L87 Difference]: Start difference. First operand 458 states and 1429 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:00,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:00,733 INFO L93 Difference]: Finished difference Result 726 states and 2225 transitions. [2021-05-22 02:35:00,733 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:35:00,733 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:00,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:00,734 INFO L225 Difference]: With dead ends: 726 [2021-05-22 02:35:00,734 INFO L226 Difference]: Without dead ends: 705 [2021-05-22 02:35:00,734 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 247.4ms TimeCoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:35:00,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 705 states. [2021-05-22 02:35:00,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 705 to 470. [2021-05-22 02:35:00,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 3.1300639658848612) internal successors, (1468), 469 states have internal predecessors, (1468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:00,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 1468 transitions. [2021-05-22 02:35:00,740 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 1468 transitions. Word has length 21 [2021-05-22 02:35:00,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:00,740 INFO L482 AbstractCegarLoop]: Abstraction has 470 states and 1468 transitions. [2021-05-22 02:35:00,740 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:00,740 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 1468 transitions. [2021-05-22 02:35:00,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:00,740 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:00,740 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:00,941 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6414,1106 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:00,941 INFO L430 AbstractCegarLoop]: === Iteration 1118 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:00,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:00,941 INFO L82 PathProgramCache]: Analyzing trace with hash 1753573427, now seen corresponding path program 1106 times [2021-05-22 02:35:00,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:00,941 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401064467] [2021-05-22 02:35:00,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:00,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:01,016 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:01,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:01,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401064467] [2021-05-22 02:35:01,017 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1401064467] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:01,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [386658066] [2021-05-22 02:35:01,017 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1107 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:01,042 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:01,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:01,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:01,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:01,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:01,080 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,084 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:01,084 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,084 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:01,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:01,099 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,103 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:01,103 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:01,103 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,103 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:01,144 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:01,144 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [386658066] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:01,144 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:01,145 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:01,145 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24379964] [2021-05-22 02:35:01,145 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:01,145 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:01,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:01,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:01,145 INFO L87 Difference]: Start difference. First operand 470 states and 1468 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:01,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:01,515 INFO L93 Difference]: Finished difference Result 720 states and 2210 transitions. [2021-05-22 02:35:01,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:35:01,515 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:01,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:01,516 INFO L225 Difference]: With dead ends: 720 [2021-05-22 02:35:01,516 INFO L226 Difference]: Without dead ends: 699 [2021-05-22 02:35:01,516 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 256.2ms TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:35:01,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 699 states. [2021-05-22 02:35:01,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 699 to 467. [2021-05-22 02:35:01,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 467 states, 466 states have (on average 3.124463519313305) internal successors, (1456), 466 states have internal predecessors, (1456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:01,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 467 states to 467 states and 1456 transitions. [2021-05-22 02:35:01,522 INFO L78 Accepts]: Start accepts. Automaton has 467 states and 1456 transitions. Word has length 21 [2021-05-22 02:35:01,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:01,522 INFO L482 AbstractCegarLoop]: Abstraction has 467 states and 1456 transitions. [2021-05-22 02:35:01,522 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:01,522 INFO L276 IsEmpty]: Start isEmpty. Operand 467 states and 1456 transitions. [2021-05-22 02:35:01,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:01,523 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:01,523 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:01,723 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6417,1107 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:01,723 INFO L430 AbstractCegarLoop]: === Iteration 1119 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:01,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:01,724 INFO L82 PathProgramCache]: Analyzing trace with hash 838491939, now seen corresponding path program 1107 times [2021-05-22 02:35:01,724 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:01,724 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1431608227] [2021-05-22 02:35:01,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:01,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:01,801 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:01,801 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:01,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1431608227] [2021-05-22 02:35:01,801 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1431608227] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:01,801 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641555137] [2021-05-22 02:35:01,801 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1108 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:01,828 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:35:01,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:01,828 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:01,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:01,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:01,879 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,882 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:01,883 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,883 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:01,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:01,899 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,902 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:01,902 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:01,902 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:01,903 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:01,945 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:01,945 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1641555137] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:01,945 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:01,945 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2021-05-22 02:35:01,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036114445] [2021-05-22 02:35:01,945 INFO L462 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-05-22 02:35:01,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:01,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-05-22 02:35:01,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:35:01,945 INFO L87 Difference]: Start difference. First operand 467 states and 1456 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:02,268 INFO L93 Difference]: Finished difference Result 702 states and 2153 transitions. [2021-05-22 02:35:02,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:35:02,269 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:02,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:02,270 INFO L225 Difference]: With dead ends: 702 [2021-05-22 02:35:02,270 INFO L226 Difference]: Without dead ends: 681 [2021-05-22 02:35:02,270 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 229.3ms TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:35:02,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 681 states. [2021-05-22 02:35:02,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 681 to 464. [2021-05-22 02:35:02,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 464 states, 463 states have (on average 3.125269978401728) internal successors, (1447), 463 states have internal predecessors, (1447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 464 states to 464 states and 1447 transitions. [2021-05-22 02:35:02,275 INFO L78 Accepts]: Start accepts. Automaton has 464 states and 1447 transitions. Word has length 21 [2021-05-22 02:35:02,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:02,275 INFO L482 AbstractCegarLoop]: Abstraction has 464 states and 1447 transitions. [2021-05-22 02:35:02,275 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 17 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,275 INFO L276 IsEmpty]: Start isEmpty. Operand 464 states and 1447 transitions. [2021-05-22 02:35:02,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:02,276 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:02,276 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:02,476 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1108 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6420 [2021-05-22 02:35:02,476 INFO L430 AbstractCegarLoop]: === Iteration 1120 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:02,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:02,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1971386031, now seen corresponding path program 1108 times [2021-05-22 02:35:02,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:02,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724628945] [2021-05-22 02:35:02,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:02,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:02,541 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:02,541 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:02,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724628945] [2021-05-22 02:35:02,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1724628945] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:02,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1963630868] [2021-05-22 02:35:02,541 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1109 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:02,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:35:02,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:02,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:02,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:02,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:02,604 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:02,607 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:02,607 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:02,607 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:35:02,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:02,623 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:02,626 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:02,626 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:02,627 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:02,627 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:02,640 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:02,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1963630868] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:02,641 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:02,641 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:35:02,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469580340] [2021-05-22 02:35:02,641 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:35:02,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:02,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:35:02,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:35:02,641 INFO L87 Difference]: Start difference. First operand 464 states and 1447 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:02,784 INFO L93 Difference]: Finished difference Result 739 states and 2244 transitions. [2021-05-22 02:35:02,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-22 02:35:02,784 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:02,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:02,785 INFO L225 Difference]: With dead ends: 739 [2021-05-22 02:35:02,785 INFO L226 Difference]: Without dead ends: 718 [2021-05-22 02:35:02,785 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 111.1ms TimeCoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:02,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-05-22 02:35:02,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 456. [2021-05-22 02:35:02,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.123076923076923) internal successors, (1421), 455 states have internal predecessors, (1421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1421 transitions. [2021-05-22 02:35:02,790 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1421 transitions. Word has length 21 [2021-05-22 02:35:02,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:02,790 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1421 transitions. [2021-05-22 02:35:02,790 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:02,790 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1421 transitions. [2021-05-22 02:35:02,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:02,791 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:02,791 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:02,991 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6423,1109 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:02,991 INFO L430 AbstractCegarLoop]: === Iteration 1121 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:02,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:02,992 INFO L82 PathProgramCache]: Analyzing trace with hash -1619731609, now seen corresponding path program 1109 times [2021-05-22 02:35:02,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:02,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084781264] [2021-05-22 02:35:02,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:02,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:03,052 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:03,053 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:03,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084781264] [2021-05-22 02:35:03,053 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084781264] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:03,053 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1926751759] [2021-05-22 02:35:03,053 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1110 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:03,080 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:35:03,081 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:03,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 20 conjunts are in the unsatisfiable core [2021-05-22 02:35:03,081 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:03,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:03,099 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:03,100 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:03,101 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:03,113 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:03,114 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:03,114 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:51, output treesize:37 [2021-05-22 02:35:03,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:03,180 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:03,181 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 20 [2021-05-22 02:35:03,182 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:03,190 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:03,190 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:03,191 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:03,191 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:55, output treesize:21 [2021-05-22 02:35:03,235 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:03,236 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1926751759] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:03,236 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:03,236 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:03,236 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290051408] [2021-05-22 02:35:03,236 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:03,236 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:03,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:03,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=195, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:03,236 INFO L87 Difference]: Start difference. First operand 456 states and 1421 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:04,287 INFO L93 Difference]: Finished difference Result 984 states and 2934 transitions. [2021-05-22 02:35:04,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-22 02:35:04,287 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:04,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:04,288 INFO L225 Difference]: With dead ends: 984 [2021-05-22 02:35:04,289 INFO L226 Difference]: Without dead ends: 942 [2021-05-22 02:35:04,289 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 754.0ms TimeCoverageRelationStatistics Valid=385, Invalid=1595, Unknown=0, NotChecked=0, Total=1980 [2021-05-22 02:35:04,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 942 states. [2021-05-22 02:35:04,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 942 to 456. [2021-05-22 02:35:04,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 456 states, 455 states have (on average 3.1164835164835165) internal successors, (1418), 455 states have internal predecessors, (1418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 456 states to 456 states and 1418 transitions. [2021-05-22 02:35:04,295 INFO L78 Accepts]: Start accepts. Automaton has 456 states and 1418 transitions. Word has length 21 [2021-05-22 02:35:04,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:04,295 INFO L482 AbstractCegarLoop]: Abstraction has 456 states and 1418 transitions. [2021-05-22 02:35:04,295 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,295 INFO L276 IsEmpty]: Start isEmpty. Operand 456 states and 1418 transitions. [2021-05-22 02:35:04,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:04,296 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:04,296 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:04,496 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1110 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6426 [2021-05-22 02:35:04,496 INFO L430 AbstractCegarLoop]: === Iteration 1122 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:04,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:04,496 INFO L82 PathProgramCache]: Analyzing trace with hash -1736989111, now seen corresponding path program 1110 times [2021-05-22 02:35:04,496 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:04,496 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676050552] [2021-05-22 02:35:04,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:04,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:04,572 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:04,572 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:04,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676050552] [2021-05-22 02:35:04,572 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676050552] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:04,572 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109058184] [2021-05-22 02:35:04,572 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1111 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:04,599 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-05-22 02:35:04,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:04,600 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:04,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:04,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:04,638 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:04,641 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:04,642 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:04,642 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:04,656 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:04,657 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:04,660 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:04,660 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:04,661 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:04,661 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:04,701 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:04,701 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109058184] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:04,701 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:04,701 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:04,701 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976063128] [2021-05-22 02:35:04,701 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:04,701 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:04,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:04,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:04,702 INFO L87 Difference]: Start difference. First operand 456 states and 1418 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:04,938 INFO L93 Difference]: Finished difference Result 771 states and 2302 transitions. [2021-05-22 02:35:04,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:35:04,938 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:04,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:04,939 INFO L225 Difference]: With dead ends: 771 [2021-05-22 02:35:04,939 INFO L226 Difference]: Without dead ends: 750 [2021-05-22 02:35:04,939 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 168.9ms TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:35:04,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 750 states. [2021-05-22 02:35:04,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 750 to 450. [2021-05-22 02:35:04,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 450 states, 449 states have (on average 3.11804008908686) internal successors, (1400), 449 states have internal predecessors, (1400), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 450 states to 450 states and 1400 transitions. [2021-05-22 02:35:04,945 INFO L78 Accepts]: Start accepts. Automaton has 450 states and 1400 transitions. Word has length 21 [2021-05-22 02:35:04,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:04,945 INFO L482 AbstractCegarLoop]: Abstraction has 450 states and 1400 transitions. [2021-05-22 02:35:04,945 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:04,945 INFO L276 IsEmpty]: Start isEmpty. Operand 450 states and 1400 transitions. [2021-05-22 02:35:04,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:04,945 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:04,945 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:05,152 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1111 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6433 [2021-05-22 02:35:05,152 INFO L430 AbstractCegarLoop]: === Iteration 1123 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:05,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:05,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1583006251, now seen corresponding path program 1111 times [2021-05-22 02:35:05,153 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:05,153 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784692097] [2021-05-22 02:35:05,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:05,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:05,223 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:05,224 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:05,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784692097] [2021-05-22 02:35:05,224 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784692097] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:05,224 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655094900] [2021-05-22 02:35:05,224 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1112 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:05,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:05,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:05,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:05,288 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:05,289 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:05,292 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:05,293 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:05,293 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:05,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:05,322 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:05,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:05,324 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:05,325 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:05,325 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:22, output treesize:7 [2021-05-22 02:35:05,352 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:05,352 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655094900] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:05,352 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:05,352 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:05,352 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680166704] [2021-05-22 02:35:05,352 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:05,352 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:05,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:05,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=194, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:05,353 INFO L87 Difference]: Start difference. First operand 450 states and 1400 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:05,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:05,657 INFO L93 Difference]: Finished difference Result 745 states and 2221 transitions. [2021-05-22 02:35:05,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:35:05,657 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:05,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:05,658 INFO L225 Difference]: With dead ends: 745 [2021-05-22 02:35:05,658 INFO L226 Difference]: Without dead ends: 724 [2021-05-22 02:35:05,659 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 191.0ms TimeCoverageRelationStatistics Valid=102, Invalid=404, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:35:05,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 724 states. [2021-05-22 02:35:05,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 724 to 452. [2021-05-22 02:35:05,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 3.11529933481153) internal successors, (1405), 451 states have internal predecessors, (1405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:05,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 1405 transitions. [2021-05-22 02:35:05,664 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 1405 transitions. Word has length 21 [2021-05-22 02:35:05,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:05,664 INFO L482 AbstractCegarLoop]: Abstraction has 452 states and 1405 transitions. [2021-05-22 02:35:05,665 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:05,665 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 1405 transitions. [2021-05-22 02:35:05,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:05,665 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:05,665 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:05,865 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6436,1112 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:05,866 INFO L430 AbstractCegarLoop]: === Iteration 1124 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:05,866 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:05,866 INFO L82 PathProgramCache]: Analyzing trace with hash 253078089, now seen corresponding path program 1112 times [2021-05-22 02:35:05,866 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:05,866 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618996741] [2021-05-22 02:35:05,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:05,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:05,939 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:05,939 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:05,939 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618996741] [2021-05-22 02:35:05,939 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618996741] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:05,940 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300219545] [2021-05-22 02:35:05,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1113 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:05,966 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:05,966 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:05,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:05,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:06,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:06,005 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,008 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:06,009 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,009 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:06,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:06,025 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,028 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:06,028 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:06,028 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,028 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:06,070 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:06,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300219545] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:06,070 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:06,070 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:06,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063907178] [2021-05-22 02:35:06,070 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:06,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:06,070 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:06,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:06,070 INFO L87 Difference]: Start difference. First operand 452 states and 1405 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:06,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:06,338 INFO L93 Difference]: Finished difference Result 739 states and 2206 transitions. [2021-05-22 02:35:06,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:35:06,338 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:06,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:06,339 INFO L225 Difference]: With dead ends: 739 [2021-05-22 02:35:06,339 INFO L226 Difference]: Without dead ends: 718 [2021-05-22 02:35:06,339 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 199.2ms TimeCoverageRelationStatistics Valid=106, Invalid=400, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:35:06,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 718 states. [2021-05-22 02:35:06,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 718 to 449. [2021-05-22 02:35:06,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 449 states, 448 states have (on average 3.109375) internal successors, (1393), 448 states have internal predecessors, (1393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:06,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 449 states to 449 states and 1393 transitions. [2021-05-22 02:35:06,345 INFO L78 Accepts]: Start accepts. Automaton has 449 states and 1393 transitions. Word has length 21 [2021-05-22 02:35:06,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:06,345 INFO L482 AbstractCegarLoop]: Abstraction has 449 states and 1393 transitions. [2021-05-22 02:35:06,345 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:06,345 INFO L276 IsEmpty]: Start isEmpty. Operand 449 states and 1393 transitions. [2021-05-22 02:35:06,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:06,345 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:06,345 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:06,546 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6439,1113 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:06,546 INFO L430 AbstractCegarLoop]: === Iteration 1125 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:06,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:06,546 INFO L82 PathProgramCache]: Analyzing trace with hash -662003399, now seen corresponding path program 1113 times [2021-05-22 02:35:06,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:06,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86008543] [2021-05-22 02:35:06,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:06,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:06,623 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:06,624 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:06,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [86008543] [2021-05-22 02:35:06,624 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [86008543] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:06,624 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416468548] [2021-05-22 02:35:06,624 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1114 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:06,656 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-05-22 02:35:06,656 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:06,657 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:06,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:06,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:06,695 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,699 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:06,699 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,699 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:06,714 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:06,715 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,718 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:06,718 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:06,718 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:06,718 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:06,759 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:06,760 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1416468548] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:06,760 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:06,760 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:06,760 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132865025] [2021-05-22 02:35:06,760 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:06,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:06,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:06,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:06,760 INFO L87 Difference]: Start difference. First operand 449 states and 1393 transitions. Second operand has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:06,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:06,999 INFO L93 Difference]: Finished difference Result 727 states and 2167 transitions. [2021-05-22 02:35:06,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:06,999 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:06,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:07,000 INFO L225 Difference]: With dead ends: 727 [2021-05-22 02:35:07,000 INFO L226 Difference]: Without dead ends: 706 [2021-05-22 02:35:07,000 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 183.6ms TimeCoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:35:07,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 706 states. [2021-05-22 02:35:07,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 706 to 446. [2021-05-22 02:35:07,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.1101123595505618) internal successors, (1384), 445 states have internal predecessors, (1384), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:07,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1384 transitions. [2021-05-22 02:35:07,006 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1384 transitions. Word has length 21 [2021-05-22 02:35:07,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:07,006 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1384 transitions. [2021-05-22 02:35:07,006 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.125) internal successors, (34), 16 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:07,006 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1384 transitions. [2021-05-22 02:35:07,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-22 02:35:07,006 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:07,007 INFO L521 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:07,207 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6442,1114 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:07,207 INFO L430 AbstractCegarLoop]: === Iteration 1126 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:07,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:07,207 INFO L82 PathProgramCache]: Analyzing trace with hash 823085927, now seen corresponding path program 1114 times [2021-05-22 02:35:07,207 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:07,207 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [511278323] [2021-05-22 02:35:07,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:07,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:07,273 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:07,273 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:07,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [511278323] [2021-05-22 02:35:07,273 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [511278323] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:07,273 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049489070] [2021-05-22 02:35:07,273 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1115 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:07,299 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:35:07,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:07,300 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:07,300 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:07,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:07,327 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,330 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:07,330 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,330 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:35:07,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 15 [2021-05-22 02:35:07,346 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,350 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:07,350 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:07,350 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,350 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:25, output treesize:10 [2021-05-22 02:35:07,390 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:07,391 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049489070] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:07,391 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:07,391 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:07,391 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804130325] [2021-05-22 02:35:07,391 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:07,391 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:07,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:07,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:07,391 INFO L87 Difference]: Start difference. First operand 446 states and 1384 transitions. Second operand has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:07,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:07,660 INFO L93 Difference]: Finished difference Result 819 states and 2413 transitions. [2021-05-22 02:35:07,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-05-22 02:35:07,661 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-05-22 02:35:07,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:07,662 INFO L225 Difference]: With dead ends: 819 [2021-05-22 02:35:07,662 INFO L226 Difference]: Without dead ends: 798 [2021-05-22 02:35:07,662 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 179.1ms TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2021-05-22 02:35:07,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 798 states. [2021-05-22 02:35:07,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 798 to 417. [2021-05-22 02:35:07,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 3.076923076923077) internal successors, (1280), 416 states have internal predecessors, (1280), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:07,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 1280 transitions. [2021-05-22 02:35:07,667 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 1280 transitions. Word has length 21 [2021-05-22 02:35:07,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:07,667 INFO L482 AbstractCegarLoop]: Abstraction has 417 states and 1280 transitions. [2021-05-22 02:35:07,667 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.2) internal successors, (33), 15 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:07,667 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 1280 transitions. [2021-05-22 02:35:07,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:07,668 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:07,668 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:07,868 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6445,1115 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:07,869 INFO L430 AbstractCegarLoop]: === Iteration 1127 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:07,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:07,869 INFO L82 PathProgramCache]: Analyzing trace with hash 384168452, now seen corresponding path program 1115 times [2021-05-22 02:35:07,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:07,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126457942] [2021-05-22 02:35:07,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:07,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:07,932 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:07,932 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:07,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126457942] [2021-05-22 02:35:07,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2126457942] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:07,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582275273] [2021-05-22 02:35:07,932 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1116 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:07,960 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:07,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:07,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:07,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:07,987 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:07,988 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,990 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:07,990 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:07,993 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:07,993 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:07,993 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:25, output treesize:9 [2021-05-22 02:35:08,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:08,009 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,011 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:08,011 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:08,011 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,011 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:20, output treesize:7 [2021-05-22 02:35:08,019 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:08,020 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582275273] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:08,020 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:08,020 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 11 [2021-05-22 02:35:08,020 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771852473] [2021-05-22 02:35:08,020 INFO L462 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-22 02:35:08,020 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:08,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-22 02:35:08,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2021-05-22 02:35:08,020 INFO L87 Difference]: Start difference. First operand 417 states and 1280 transitions. Second operand has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:08,116 INFO L93 Difference]: Finished difference Result 679 states and 2041 transitions. [2021-05-22 02:35:08,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:08,117 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:08,117 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:08,122 INFO L225 Difference]: With dead ends: 679 [2021-05-22 02:35:08,122 INFO L226 Difference]: Without dead ends: 651 [2021-05-22 02:35:08,122 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 19 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 70.6ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:08,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 651 states. [2021-05-22 02:35:08,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 651 to 427. [2021-05-22 02:35:08,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 426 states have (on average 3.0938967136150235) internal successors, (1318), 426 states have internal predecessors, (1318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 1318 transitions. [2021-05-22 02:35:08,127 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 1318 transitions. Word has length 22 [2021-05-22 02:35:08,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:08,127 INFO L482 AbstractCegarLoop]: Abstraction has 427 states and 1318 transitions. [2021-05-22 02:35:08,127 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 2.0) internal successors, (22), 11 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,127 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 1318 transitions. [2021-05-22 02:35:08,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:08,127 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:08,127 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:08,328 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6448,1116 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:08,328 INFO L430 AbstractCegarLoop]: === Iteration 1128 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:08,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:08,328 INFO L82 PathProgramCache]: Analyzing trace with hash 1340933574, now seen corresponding path program 1116 times [2021-05-22 02:35:08,328 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:08,328 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1450466770] [2021-05-22 02:35:08,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:08,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:08,392 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:08,393 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:08,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1450466770] [2021-05-22 02:35:08,393 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1450466770] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:08,393 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890023911] [2021-05-22 02:35:08,393 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1117 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:08,421 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 2 check-sat command(s) [2021-05-22 02:35:08,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:08,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:08,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:08,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:08,445 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,448 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:08,448 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,448 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:20, output treesize:13 [2021-05-22 02:35:08,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:08,472 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:08,473 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,476 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:08,476 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:08,476 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:08,476 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:29, output treesize:5 [2021-05-22 02:35:08,482 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:08,482 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890023911] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:08,482 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:08,483 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:35:08,483 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1859800505] [2021-05-22 02:35:08,483 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:35:08,483 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:08,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:35:08,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:08,483 INFO L87 Difference]: Start difference. First operand 427 states and 1318 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:08,668 INFO L93 Difference]: Finished difference Result 633 states and 1916 transitions. [2021-05-22 02:35:08,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:08,668 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:08,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:08,669 INFO L225 Difference]: With dead ends: 633 [2021-05-22 02:35:08,669 INFO L226 Difference]: Without dead ends: 575 [2021-05-22 02:35:08,669 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 19 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 87.0ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:08,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-05-22 02:35:08,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 428. [2021-05-22 02:35:08,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 3.088992974238876) internal successors, (1319), 427 states have internal predecessors, (1319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 1319 transitions. [2021-05-22 02:35:08,674 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 1319 transitions. Word has length 22 [2021-05-22 02:35:08,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:08,674 INFO L482 AbstractCegarLoop]: Abstraction has 428 states and 1319 transitions. [2021-05-22 02:35:08,674 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:08,674 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 1319 transitions. [2021-05-22 02:35:08,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:08,675 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:08,675 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:08,875 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1117 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6452 [2021-05-22 02:35:08,875 INFO L430 AbstractCegarLoop]: === Iteration 1129 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:08,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:08,875 INFO L82 PathProgramCache]: Analyzing trace with hash -1558531740, now seen corresponding path program 1117 times [2021-05-22 02:35:08,876 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:08,876 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039764469] [2021-05-22 02:35:08,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:08,941 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:08,941 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:08,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039764469] [2021-05-22 02:35:08,941 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039764469] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:08,941 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [754022424] [2021-05-22 02:35:08,941 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1118 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:08,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:08,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:08,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:08,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:08,997 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:08,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:08,999 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,001 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:09,002 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:09,002 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:25, output treesize:9 [2021-05-22 02:35:09,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:09,028 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,030 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:09,030 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:09,031 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,031 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:20, output treesize:7 [2021-05-22 02:35:09,038 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:09,038 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [754022424] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:09,038 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:09,038 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:35:09,038 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1342909586] [2021-05-22 02:35:09,038 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:35:09,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:09,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:35:09,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:09,038 INFO L87 Difference]: Start difference. First operand 428 states and 1319 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:09,162 INFO L93 Difference]: Finished difference Result 661 states and 2002 transitions. [2021-05-22 02:35:09,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:09,162 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:09,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:09,163 INFO L225 Difference]: With dead ends: 661 [2021-05-22 02:35:09,163 INFO L226 Difference]: Without dead ends: 633 [2021-05-22 02:35:09,163 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 83.4ms TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:35:09,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 633 states. [2021-05-22 02:35:09,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 633 to 430. [2021-05-22 02:35:09,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.086247086247086) internal successors, (1324), 429 states have internal predecessors, (1324), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1324 transitions. [2021-05-22 02:35:09,168 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1324 transitions. Word has length 22 [2021-05-22 02:35:09,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:09,168 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1324 transitions. [2021-05-22 02:35:09,168 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,169 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1324 transitions. [2021-05-22 02:35:09,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:09,169 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:09,169 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:09,369 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6456,1118 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:09,369 INFO L430 AbstractCegarLoop]: === Iteration 1130 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:09,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:09,370 INFO L82 PathProgramCache]: Analyzing trace with hash 127860100, now seen corresponding path program 1118 times [2021-05-22 02:35:09,370 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:09,370 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [682828699] [2021-05-22 02:35:09,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:09,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:09,436 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:09,437 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:09,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [682828699] [2021-05-22 02:35:09,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [682828699] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:09,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980111838] [2021-05-22 02:35:09,437 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1119 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:09,463 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:09,463 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:09,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:09,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:09,490 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:09,491 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,492 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:09,492 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:09,495 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:09,495 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:25, output treesize:9 [2021-05-22 02:35:09,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:09,513 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,514 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:09,515 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:09,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:09,520 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:09,521 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:09,521 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:35, output treesize:13 [2021-05-22 02:35:09,544 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:09,544 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980111838] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:09,544 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:09,544 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:35:09,544 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651683] [2021-05-22 02:35:09,544 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:35:09,545 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:09,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:35:09,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:35:09,545 INFO L87 Difference]: Start difference. First operand 430 states and 1324 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:09,684 INFO L93 Difference]: Finished difference Result 658 states and 1993 transitions. [2021-05-22 02:35:09,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:09,684 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:09,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:09,685 INFO L225 Difference]: With dead ends: 658 [2021-05-22 02:35:09,685 INFO L226 Difference]: Without dead ends: 624 [2021-05-22 02:35:09,685 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 18 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 103.6ms TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:09,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2021-05-22 02:35:09,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 427. [2021-05-22 02:35:09,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 427 states, 426 states have (on average 3.0938967136150235) internal successors, (1318), 426 states have internal predecessors, (1318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 427 states to 427 states and 1318 transitions. [2021-05-22 02:35:09,690 INFO L78 Accepts]: Start accepts. Automaton has 427 states and 1318 transitions. Word has length 22 [2021-05-22 02:35:09,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:09,690 INFO L482 AbstractCegarLoop]: Abstraction has 427 states and 1318 transitions. [2021-05-22 02:35:09,690 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 13 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:09,690 INFO L276 IsEmpty]: Start isEmpty. Operand 427 states and 1318 transitions. [2021-05-22 02:35:09,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:09,691 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:09,691 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:09,891 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6460,1119 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:09,891 INFO L430 AbstractCegarLoop]: === Iteration 1131 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:09,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:09,891 INFO L82 PathProgramCache]: Analyzing trace with hash 1468978378, now seen corresponding path program 1119 times [2021-05-22 02:35:09,892 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:09,892 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754476027] [2021-05-22 02:35:09,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:09,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:09,959 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:09,959 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:09,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754476027] [2021-05-22 02:35:09,959 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754476027] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:09,959 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596201238] [2021-05-22 02:35:09,959 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1120 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:09,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:35:09,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:09,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:09,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:10,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:10,039 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,040 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:10,041 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,047 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:10,047 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:10,047 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:17 [2021-05-22 02:35:10,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:10,062 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,064 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:10,064 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:10,064 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,064 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:20, output treesize:7 [2021-05-22 02:35:10,071 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:10,071 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596201238] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:10,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:10,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:35:10,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049952545] [2021-05-22 02:35:10,072 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:35:10,072 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:10,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:35:10,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:10,072 INFO L87 Difference]: Start difference. First operand 427 states and 1318 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:10,184 INFO L93 Difference]: Finished difference Result 550 states and 1681 transitions. [2021-05-22 02:35:10,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:10,184 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:10,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:10,185 INFO L225 Difference]: With dead ends: 550 [2021-05-22 02:35:10,185 INFO L226 Difference]: Without dead ends: 522 [2021-05-22 02:35:10,185 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 5 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 91.3ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:10,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-05-22 02:35:10,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 433. [2021-05-22 02:35:10,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 3.099537037037037) internal successors, (1339), 432 states have internal predecessors, (1339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 1339 transitions. [2021-05-22 02:35:10,190 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 1339 transitions. Word has length 22 [2021-05-22 02:35:10,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:10,190 INFO L482 AbstractCegarLoop]: Abstraction has 433 states and 1339 transitions. [2021-05-22 02:35:10,190 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,190 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 1339 transitions. [2021-05-22 02:35:10,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:10,190 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:10,190 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:10,391 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6465,1120 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:10,391 INFO L430 AbstractCegarLoop]: === Iteration 1132 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:10,391 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:10,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1246769766, now seen corresponding path program 1120 times [2021-05-22 02:35:10,391 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:10,391 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678918389] [2021-05-22 02:35:10,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:10,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:10,455 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:10,456 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:10,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678918389] [2021-05-22 02:35:10,456 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678918389] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:10,456 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743642648] [2021-05-22 02:35:10,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1121 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:10,483 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:35:10,483 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:10,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:10,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:10,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:10,531 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,535 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:10,535 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,536 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:10,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:10,570 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:10,571 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:10,573 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:10,574 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:10,574 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:10,574 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:29, output treesize:5 [2021-05-22 02:35:10,580 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:10,580 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743642648] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:10,580 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:10,580 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:10,581 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405296273] [2021-05-22 02:35:10,581 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:10,581 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:10,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:10,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:10,581 INFO L87 Difference]: Start difference. First operand 433 states and 1339 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:10,726 INFO L93 Difference]: Finished difference Result 556 states and 1699 transitions. [2021-05-22 02:35:10,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:10,727 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:10,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:10,727 INFO L225 Difference]: With dead ends: 556 [2021-05-22 02:35:10,727 INFO L226 Difference]: Without dead ends: 507 [2021-05-22 02:35:10,727 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 103.7ms TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:10,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-05-22 02:35:10,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 433. [2021-05-22 02:35:10,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 3.0925925925925926) internal successors, (1336), 432 states have internal predecessors, (1336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 1336 transitions. [2021-05-22 02:35:10,732 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 1336 transitions. Word has length 22 [2021-05-22 02:35:10,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:10,732 INFO L482 AbstractCegarLoop]: Abstraction has 433 states and 1336 transitions. [2021-05-22 02:35:10,732 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:10,732 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 1336 transitions. [2021-05-22 02:35:10,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:10,732 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:10,732 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:10,933 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6469,1121 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:10,933 INFO L430 AbstractCegarLoop]: === Iteration 1133 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:10,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:10,933 INFO L82 PathProgramCache]: Analyzing trace with hash -1139597078, now seen corresponding path program 1121 times [2021-05-22 02:35:10,933 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:10,933 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964283614] [2021-05-22 02:35:10,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:10,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:10,996 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:10,996 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:10,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964283614] [2021-05-22 02:35:10,996 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964283614] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:10,996 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930066989] [2021-05-22 02:35:10,996 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1122 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:11,022 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:11,022 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:11,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:11,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:11,066 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:11,067 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:11,069 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,075 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:11,076 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:11,076 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:17 [2021-05-22 02:35:11,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:11,087 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:11,089 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,095 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:11,095 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:11,095 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:11,095 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:35, output treesize:13 [2021-05-22 02:35:11,111 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:11,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930066989] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:11,112 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:11,112 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-05-22 02:35:11,112 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665742246] [2021-05-22 02:35:11,112 INFO L462 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-22 02:35:11,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:11,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-22 02:35:11,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:11,112 INFO L87 Difference]: Start difference. First operand 433 states and 1336 transitions. Second operand has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:11,233 INFO L93 Difference]: Finished difference Result 574 states and 1753 transitions. [2021-05-22 02:35:11,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:11,233 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:11,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:11,234 INFO L225 Difference]: With dead ends: 574 [2021-05-22 02:35:11,234 INFO L226 Difference]: Without dead ends: 540 [2021-05-22 02:35:11,234 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 6 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 84.7ms TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-05-22 02:35:11,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 540 states. [2021-05-22 02:35:11,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 540 to 430. [2021-05-22 02:35:11,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.093240093240093) internal successors, (1327), 429 states have internal predecessors, (1327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1327 transitions. [2021-05-22 02:35:11,238 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1327 transitions. Word has length 22 [2021-05-22 02:35:11,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:11,238 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1327 transitions. [2021-05-22 02:35:11,238 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.0) internal successors, (24), 12 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,238 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1327 transitions. [2021-05-22 02:35:11,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:11,239 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:11,239 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:11,439 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1122 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6473 [2021-05-22 02:35:11,439 INFO L430 AbstractCegarLoop]: === Iteration 1134 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:11,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:11,440 INFO L82 PathProgramCache]: Analyzing trace with hash -2025395358, now seen corresponding path program 1122 times [2021-05-22 02:35:11,440 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:11,440 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311013005] [2021-05-22 02:35:11,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:11,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:11,501 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:11,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311013005] [2021-05-22 02:35:11,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311013005] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:11,501 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1866332784] [2021-05-22 02:35:11,501 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1123 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:11,527 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:35:11,527 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:11,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:11,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:11,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:11,584 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,587 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:11,588 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,588 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:23, output treesize:16 [2021-05-22 02:35:11,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:11,607 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:11,609 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:11,614 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:11,614 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:11,615 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:11,615 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:35, output treesize:13 [2021-05-22 02:35:11,630 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:11,631 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1866332784] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:11,631 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:11,631 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2021-05-22 02:35:11,631 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081778186] [2021-05-22 02:35:11,631 INFO L462 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-22 02:35:11,631 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:11,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-22 02:35:11,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-05-22 02:35:11,631 INFO L87 Difference]: Start difference. First operand 430 states and 1327 transitions. Second operand has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:11,747 INFO L93 Difference]: Finished difference Result 553 states and 1690 transitions. [2021-05-22 02:35:11,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:11,747 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:11,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:11,748 INFO L225 Difference]: With dead ends: 553 [2021-05-22 02:35:11,748 INFO L226 Difference]: Without dead ends: 513 [2021-05-22 02:35:11,748 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 5 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 111.2ms TimeCoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2021-05-22 02:35:11,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 513 states. [2021-05-22 02:35:11,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 513 to 430. [2021-05-22 02:35:11,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.093240093240093) internal successors, (1327), 429 states have internal predecessors, (1327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1327 transitions. [2021-05-22 02:35:11,752 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1327 transitions. Word has length 22 [2021-05-22 02:35:11,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:11,752 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1327 transitions. [2021-05-22 02:35:11,752 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 2.0) internal successors, (26), 13 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:11,752 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1327 transitions. [2021-05-22 02:35:11,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:11,753 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:11,753 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:11,953 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6478,1123 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:11,953 INFO L430 AbstractCegarLoop]: === Iteration 1135 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:11,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:11,953 INFO L82 PathProgramCache]: Analyzing trace with hash 1985309254, now seen corresponding path program 1123 times [2021-05-22 02:35:11,953 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:11,954 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114260240] [2021-05-22 02:35:11,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:11,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:12,021 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:12,022 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:12,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114260240] [2021-05-22 02:35:12,022 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114260240] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:12,022 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [438738560] [2021-05-22 02:35:12,022 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1124 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:12,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:12,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:12,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:12,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:12,098 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:12,100 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,106 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:12,106 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:12,107 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:17 [2021-05-22 02:35:12,129 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:12,130 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,137 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:12,137 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:12,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:12,139 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,145 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:12,145 INFO L518 ElimStorePlain]: Eliminatee v_prenex_336 vanished before elimination [2021-05-22 02:35:12,145 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:12,145 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 4 variables, input treesize:35, output treesize:13 [2021-05-22 02:35:12,172 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:12,173 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [438738560] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:12,173 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:12,173 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:12,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479262760] [2021-05-22 02:35:12,173 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:12,173 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:12,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:12,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:12,173 INFO L87 Difference]: Start difference. First operand 430 states and 1327 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:12,339 INFO L93 Difference]: Finished difference Result 592 states and 1798 transitions. [2021-05-22 02:35:12,339 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-22 02:35:12,339 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:12,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:12,340 INFO L225 Difference]: With dead ends: 592 [2021-05-22 02:35:12,340 INFO L226 Difference]: Without dead ends: 552 [2021-05-22 02:35:12,340 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 156.2ms TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2021-05-22 02:35:12,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 552 states. [2021-05-22 02:35:12,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 552 to 448. [2021-05-22 02:35:12,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.102908277404922) internal successors, (1387), 447 states have internal predecessors, (1387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1387 transitions. [2021-05-22 02:35:12,345 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1387 transitions. Word has length 22 [2021-05-22 02:35:12,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:12,345 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1387 transitions. [2021-05-22 02:35:12,345 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,345 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1387 transitions. [2021-05-22 02:35:12,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:12,345 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:12,346 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:12,546 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1124 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6482 [2021-05-22 02:35:12,546 INFO L430 AbstractCegarLoop]: === Iteration 1136 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:12,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:12,546 INFO L82 PathProgramCache]: Analyzing trace with hash -623266202, now seen corresponding path program 1124 times [2021-05-22 02:35:12,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:12,546 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149923829] [2021-05-22 02:35:12,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:12,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:12,613 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:12,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:12,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149923829] [2021-05-22 02:35:12,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1149923829] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:12,614 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622221301] [2021-05-22 02:35:12,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1125 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:12,639 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:12,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:12,640 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-22 02:35:12,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:12,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 11 [2021-05-22 02:35:12,694 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-05-22 02:35:12,697 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,704 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:12,704 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 2 xjuncts. [2021-05-22 02:35:12,704 INFO L247 ElimStorePlain]: Needed 3 recursive calls to eliminate 1 variables, input treesize:31, output treesize:17 [2021-05-22 02:35:12,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:12,735 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,737 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:12,737 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:12,737 INFO L550 ElimStorePlain]: Start of recursive call 1: 2 dim-1 vars, End of recursive call: and 1 xjuncts. [2021-05-22 02:35:12,738 INFO L247 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:20, output treesize:7 [2021-05-22 02:35:12,747 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:12,747 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622221301] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:12,747 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:12,747 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:12,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154919711] [2021-05-22 02:35:12,748 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:12,748 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:12,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:12,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:12,748 INFO L87 Difference]: Start difference. First operand 448 states and 1387 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,874 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:12,874 INFO L93 Difference]: Finished difference Result 547 states and 1663 transitions. [2021-05-22 02:35:12,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-22 02:35:12,875 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:12,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:12,875 INFO L225 Difference]: With dead ends: 547 [2021-05-22 02:35:12,875 INFO L226 Difference]: Without dead ends: 516 [2021-05-22 02:35:12,875 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 138.1ms TimeCoverageRelationStatistics Valid=65, Invalid=207, Unknown=0, NotChecked=0, Total=272 [2021-05-22 02:35:12,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 516 states. [2021-05-22 02:35:12,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 516 to 428. [2021-05-22 02:35:12,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 428 states, 427 states have (on average 3.1053864168618266) internal successors, (1326), 427 states have internal predecessors, (1326), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 428 states to 428 states and 1326 transitions. [2021-05-22 02:35:12,880 INFO L78 Accepts]: Start accepts. Automaton has 428 states and 1326 transitions. Word has length 22 [2021-05-22 02:35:12,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:12,880 INFO L482 AbstractCegarLoop]: Abstraction has 428 states and 1326 transitions. [2021-05-22 02:35:12,880 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:12,880 INFO L276 IsEmpty]: Start isEmpty. Operand 428 states and 1326 transitions. [2021-05-22 02:35:12,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:12,881 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:12,881 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:13,081 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6491,1125 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:13,081 INFO L430 AbstractCegarLoop]: === Iteration 1137 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:13,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:13,081 INFO L82 PathProgramCache]: Analyzing trace with hash -1196397136, now seen corresponding path program 1125 times [2021-05-22 02:35:13,081 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:13,082 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1209121830] [2021-05-22 02:35:13,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:13,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:13,161 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:13,162 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:13,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1209121830] [2021-05-22 02:35:13,162 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1209121830] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:13,162 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1116590546] [2021-05-22 02:35:13,162 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1126 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:13,192 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-05-22 02:35:13,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:13,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:13,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:13,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:13,283 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:13,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:13,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:13,286 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,287 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:13,288 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,290 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:13,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:13,291 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,303 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:13,305 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:13,305 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:93, output treesize:48 [2021-05-22 02:35:13,438 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_339, o_4, v_prenex_340, v_prenex_341, v_prenex_344, v_prenex_345], 1=[v_prenex_338, o_2]} [2021-05-22 02:35:13,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:13,442 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,485 INFO L628 ElimStorePlain]: treesize reduction 27, result has 74.5 percent of original size [2021-05-22 02:35:13,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:13,488 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,522 INFO L628 ElimStorePlain]: treesize reduction 9, result has 87.5 percent of original size [2021-05-22 02:35:13,524 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:13,525 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,540 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:13,540 INFO L518 ElimStorePlain]: Eliminatee v_prenex_341 vanished before elimination [2021-05-22 02:35:13,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:13,543 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:13,555 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:13,556 INFO L518 ElimStorePlain]: Eliminatee v_prenex_345 vanished before elimination [2021-05-22 02:35:13,556 INFO L518 ElimStorePlain]: Eliminatee v_prenex_338 vanished before elimination [2021-05-22 02:35:13,556 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:13,557 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:35:13,558 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 12 variables, input treesize:113, output treesize:13 [2021-05-22 02:35:13,569 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:13,569 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1116590546] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:13,569 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:13,569 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:13,569 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [688207876] [2021-05-22 02:35:13,569 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:13,569 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:13,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:13,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:13,570 INFO L87 Difference]: Start difference. First operand 428 states and 1326 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:13,836 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:13,837 INFO L93 Difference]: Finished difference Result 583 states and 1723 transitions. [2021-05-22 02:35:13,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:13,837 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:13,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:13,838 INFO L225 Difference]: With dead ends: 583 [2021-05-22 02:35:13,838 INFO L226 Difference]: Without dead ends: 532 [2021-05-22 02:35:13,838 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 275.1ms TimeCoverageRelationStatistics Valid=94, Invalid=326, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:35:13,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 532 states. [2021-05-22 02:35:13,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 532 to 432. [2021-05-22 02:35:13,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.0951276102088165) internal successors, (1334), 431 states have internal predecessors, (1334), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:13,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1334 transitions. [2021-05-22 02:35:13,843 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1334 transitions. Word has length 22 [2021-05-22 02:35:13,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:13,843 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1334 transitions. [2021-05-22 02:35:13,843 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:13,843 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1334 transitions. [2021-05-22 02:35:13,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:13,843 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:13,843 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:14,046 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1126 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6495 [2021-05-22 02:35:14,046 INFO L430 AbstractCegarLoop]: === Iteration 1138 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:14,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:14,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1290560944, now seen corresponding path program 1126 times [2021-05-22 02:35:14,046 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:14,046 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302921254] [2021-05-22 02:35:14,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:14,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:14,130 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:14,130 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:14,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302921254] [2021-05-22 02:35:14,130 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302921254] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:14,130 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1081934957] [2021-05-22 02:35:14,130 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1127 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:14,157 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:35:14,157 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:14,158 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:14,158 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:14,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:14,278 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:14,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:14,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:14,282 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,283 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:14,283 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:14,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:14,287 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,302 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:14,304 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:14,304 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:93, output treesize:48 [2021-05-22 02:35:14,457 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_349, o_4, v_prenex_350, v_prenex_353, v_prenex_354, v_prenex_348], 1=[o_2, v_prenex_347]} [2021-05-22 02:35:14,460 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:14,460 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,500 INFO L628 ElimStorePlain]: treesize reduction 34, result has 67.3 percent of original size [2021-05-22 02:35:14,501 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:14,501 INFO L518 ElimStorePlain]: Eliminatee v_prenex_350 vanished before elimination [2021-05-22 02:35:14,503 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:14,504 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,520 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:14,520 INFO L518 ElimStorePlain]: Eliminatee v_prenex_354 vanished before elimination [2021-05-22 02:35:14,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:14,523 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:14,550 INFO L628 ElimStorePlain]: treesize reduction 9, result has 80.9 percent of original size [2021-05-22 02:35:14,550 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:14,550 INFO L518 ElimStorePlain]: Eliminatee v_prenex_347 vanished before elimination [2021-05-22 02:35:14,552 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:35:14,552 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 12 variables, input treesize:113, output treesize:13 [2021-05-22 02:35:14,563 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:14,563 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1081934957] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:14,563 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:14,564 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:14,564 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [593025987] [2021-05-22 02:35:14,564 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:14,564 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:14,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:14,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=191, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:14,564 INFO L87 Difference]: Start difference. First operand 432 states and 1334 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:14,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:14,828 INFO L93 Difference]: Finished difference Result 577 states and 1706 transitions. [2021-05-22 02:35:14,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:14,829 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:14,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:14,830 INFO L225 Difference]: With dead ends: 577 [2021-05-22 02:35:14,830 INFO L226 Difference]: Without dead ends: 534 [2021-05-22 02:35:14,830 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 295.5ms TimeCoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:35:14,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 534 states. [2021-05-22 02:35:14,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 534 to 434. [2021-05-22 02:35:14,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 433 states have (on average 3.087759815242494) internal successors, (1337), 433 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:14,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 1337 transitions. [2021-05-22 02:35:14,834 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 1337 transitions. Word has length 22 [2021-05-22 02:35:14,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:14,834 INFO L482 AbstractCegarLoop]: Abstraction has 434 states and 1337 transitions. [2021-05-22 02:35:14,834 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:14,835 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 1337 transitions. [2021-05-22 02:35:14,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:14,835 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:14,835 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:15,035 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1127 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6509 [2021-05-22 02:35:15,035 INFO L430 AbstractCegarLoop]: === Iteration 1139 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:15,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:15,036 INFO L82 PathProgramCache]: Analyzing trace with hash -552021456, now seen corresponding path program 1127 times [2021-05-22 02:35:15,036 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:15,036 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198599266] [2021-05-22 02:35:15,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:15,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:15,111 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:15,112 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:15,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198599266] [2021-05-22 02:35:15,112 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198599266] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:15,112 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466223205] [2021-05-22 02:35:15,112 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1128 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:15,138 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:15,138 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:15,139 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:15,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:15,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:15,231 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:15,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:15,232 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:15,235 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,236 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:15,236 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,238 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:15,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:15,239 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,252 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:15,253 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:15,254 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:93, output treesize:48 [2021-05-22 02:35:15,360 INFO L446 ElimStorePlain]: Different costs {0=[o_4, v_prenex_360, v_prenex_363, v_prenex_357, v_prenex_358, v_prenex_359], 1=[o_2, v_prenex_356]} [2021-05-22 02:35:15,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:15,365 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,416 INFO L628 ElimStorePlain]: treesize reduction 33, result has 70.8 percent of original size [2021-05-22 02:35:15,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:15,419 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,438 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:15,439 INFO L518 ElimStorePlain]: Eliminatee v_prenex_363 vanished before elimination [2021-05-22 02:35:15,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:15,441 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,474 INFO L628 ElimStorePlain]: treesize reduction 9, result has 84.2 percent of original size [2021-05-22 02:35:15,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:15,477 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:15,491 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:15,491 INFO L518 ElimStorePlain]: Eliminatee v_prenex_359 vanished before elimination [2021-05-22 02:35:15,491 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:15,491 INFO L518 ElimStorePlain]: Eliminatee v_prenex_356 vanished before elimination [2021-05-22 02:35:15,493 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:35:15,493 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 12 variables, input treesize:120, output treesize:14 [2021-05-22 02:35:15,509 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:15,509 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466223205] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:15,509 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:15,509 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:15,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690651317] [2021-05-22 02:35:15,509 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:15,509 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:15,509 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:15,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:15,509 INFO L87 Difference]: Start difference. First operand 434 states and 1337 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:15,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:15,863 INFO L93 Difference]: Finished difference Result 606 states and 1770 transitions. [2021-05-22 02:35:15,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-22 02:35:15,864 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:15,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:15,864 INFO L225 Difference]: With dead ends: 606 [2021-05-22 02:35:15,864 INFO L226 Difference]: Without dead ends: 571 [2021-05-22 02:35:15,865 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 347.7ms TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2021-05-22 02:35:15,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 571 states. [2021-05-22 02:35:15,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 571 to 446. [2021-05-22 02:35:15,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.0719101123595505) internal successors, (1367), 445 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:15,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1367 transitions. [2021-05-22 02:35:15,869 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1367 transitions. Word has length 22 [2021-05-22 02:35:15,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:15,870 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1367 transitions. [2021-05-22 02:35:15,870 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:15,870 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1367 transitions. [2021-05-22 02:35:15,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:15,870 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:15,870 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:16,070 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6529,1128 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:16,071 INFO L430 AbstractCegarLoop]: === Iteration 1140 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:16,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:16,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1134370384, now seen corresponding path program 1128 times [2021-05-22 02:35:16,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:16,071 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615087296] [2021-05-22 02:35:16,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:16,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:16,161 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:16,161 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:16,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615087296] [2021-05-22 02:35:16,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615087296] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:16,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81708068] [2021-05-22 02:35:16,161 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1129 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:16,186 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 3 check-sat command(s) [2021-05-22 02:35:16,187 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:16,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:16,187 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:16,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:16,280 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,282 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:16,282 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:16,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:16,283 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,284 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:16,284 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,286 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:16,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:16,287 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,300 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:16,302 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:16,302 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:93, output treesize:48 [2021-05-22 02:35:16,394 INFO L446 ElimStorePlain]: Different costs {0=[v_prenex_370, o_4, v_prenex_371, v_prenex_366, v_prenex_367, v_prenex_368], 1=[o_2, v_prenex_365]} [2021-05-22 02:35:16,397 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:16,398 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,443 INFO L628 ElimStorePlain]: treesize reduction 40, result has 64.0 percent of original size [2021-05-22 02:35:16,443 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:16,443 INFO L518 ElimStorePlain]: Eliminatee v_prenex_371 vanished before elimination [2021-05-22 02:35:16,445 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:16,446 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,481 INFO L628 ElimStorePlain]: treesize reduction 9, result has 85.9 percent of original size [2021-05-22 02:35:16,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:16,484 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:16,498 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:16,498 INFO L518 ElimStorePlain]: Eliminatee v_prenex_368 vanished before elimination [2021-05-22 02:35:16,498 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:16,498 INFO L518 ElimStorePlain]: Eliminatee v_prenex_365 vanished before elimination [2021-05-22 02:35:16,500 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:35:16,500 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 12 variables, input treesize:120, output treesize:14 [2021-05-22 02:35:16,516 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:16,516 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81708068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:16,516 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:16,516 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:16,516 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291334486] [2021-05-22 02:35:16,516 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:16,516 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:16,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:16,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:16,517 INFO L87 Difference]: Start difference. First operand 446 states and 1367 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:16,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:16,854 INFO L93 Difference]: Finished difference Result 580 states and 1707 transitions. [2021-05-22 02:35:16,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:35:16,854 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:16,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:16,855 INFO L225 Difference]: With dead ends: 580 [2021-05-22 02:35:16,855 INFO L226 Difference]: Without dead ends: 541 [2021-05-22 02:35:16,855 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 312.3ms TimeCoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-05-22 02:35:16,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2021-05-22 02:35:16,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 430. [2021-05-22 02:35:16,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 3.097902097902098) internal successors, (1329), 429 states have internal predecessors, (1329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:16,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 1329 transitions. [2021-05-22 02:35:16,859 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 1329 transitions. Word has length 22 [2021-05-22 02:35:16,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:16,859 INFO L482 AbstractCegarLoop]: Abstraction has 430 states and 1329 transitions. [2021-05-22 02:35:16,859 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:16,859 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 1329 transitions. [2021-05-22 02:35:16,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:16,860 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:16,860 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:17,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1129 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6543 [2021-05-22 02:35:17,060 INFO L430 AbstractCegarLoop]: === Iteration 1141 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:17,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:17,061 INFO L82 PathProgramCache]: Analyzing trace with hash -1927027798, now seen corresponding path program 1129 times [2021-05-22 02:35:17,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:17,061 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933399558] [2021-05-22 02:35:17,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:17,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:17,140 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:17,140 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:17,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933399558] [2021-05-22 02:35:17,140 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [933399558] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:17,140 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1815285229] [2021-05-22 02:35:17,140 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1130 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:17,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:17,166 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:17,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:17,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:17,286 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:17,289 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:17,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:17,290 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,292 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:17,292 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,294 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:17,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:17,295 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,312 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:17,313 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:17,314 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:105, output treesize:58 [2021-05-22 02:35:17,430 INFO L446 ElimStorePlain]: Different costs {0=[o_2, o_4, v_prenex_374, v_prenex_375, v_prenex_377, v_prenex_379], 1=[v_prenex_376, v_prenex_378]} [2021-05-22 02:35:17,434 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:17,435 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,475 INFO L628 ElimStorePlain]: treesize reduction 34, result has 64.9 percent of original size [2021-05-22 02:35:17,476 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:17,478 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:17,478 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,495 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:17,495 INFO L518 ElimStorePlain]: Eliminatee v_prenex_375 vanished before elimination [2021-05-22 02:35:17,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:17,498 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:17,524 INFO L628 ElimStorePlain]: treesize reduction 9, result has 80.9 percent of original size [2021-05-22 02:35:17,525 INFO L518 ElimStorePlain]: Eliminatee v_prenex_379 vanished before elimination [2021-05-22 02:35:17,525 INFO L518 ElimStorePlain]: Eliminatee v_prenex_376 vanished before elimination [2021-05-22 02:35:17,525 INFO L518 ElimStorePlain]: Eliminatee v_prenex_378 vanished before elimination [2021-05-22 02:35:17,526 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:35:17,526 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 12 variables, input treesize:113, output treesize:13 [2021-05-22 02:35:17,538 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:17,538 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1815285229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:17,538 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:17,539 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 16 [2021-05-22 02:35:17,539 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487633062] [2021-05-22 02:35:17,539 INFO L462 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-22 02:35:17,539 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:17,539 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-22 02:35:17,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2021-05-22 02:35:17,539 INFO L87 Difference]: Start difference. First operand 430 states and 1329 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:17,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:17,807 INFO L93 Difference]: Finished difference Result 522 states and 1575 transitions. [2021-05-22 02:35:17,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:17,807 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:17,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:17,808 INFO L225 Difference]: With dead ends: 522 [2021-05-22 02:35:17,808 INFO L226 Difference]: Without dead ends: 479 [2021-05-22 02:35:17,808 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 15 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 298.9ms TimeCoverageRelationStatistics Valid=98, Invalid=322, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:35:17,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2021-05-22 02:35:17,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 434. [2021-05-22 02:35:17,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 434 states, 433 states have (on average 3.087759815242494) internal successors, (1337), 433 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:17,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 1337 transitions. [2021-05-22 02:35:17,813 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 1337 transitions. Word has length 22 [2021-05-22 02:35:17,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:17,813 INFO L482 AbstractCegarLoop]: Abstraction has 434 states and 1337 transitions. [2021-05-22 02:35:17,813 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 16 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:17,813 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 1337 transitions. [2021-05-22 02:35:17,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:17,813 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:17,813 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:18,013 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6557,1130 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:18,014 INFO L430 AbstractCegarLoop]: === Iteration 1142 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:18,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:18,014 INFO L82 PathProgramCache]: Analyzing trace with hash -1188488310, now seen corresponding path program 1130 times [2021-05-22 02:35:18,014 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:18,014 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607475630] [2021-05-22 02:35:18,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:18,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:18,096 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:18,096 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:18,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607475630] [2021-05-22 02:35:18,096 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1607475630] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:18,096 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472864342] [2021-05-22 02:35:18,096 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1131 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:18,122 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-22 02:35:18,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:18,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:18,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:18,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:18,237 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,240 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:18,240 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:18,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:18,241 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,243 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:18,243 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,245 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:18,245 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:18,246 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,271 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:18,273 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:18,273 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:105, output treesize:58 [2021-05-22 02:35:18,332 INFO L446 ElimStorePlain]: Different costs {0=[o_4, v_prenex_384, v_prenex_385, v_prenex_386, v_prenex_387, v_prenex_388], 1=[o_2, v_prenex_383]} [2021-05-22 02:35:18,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:18,336 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,378 INFO L628 ElimStorePlain]: treesize reduction 49, result has 56.6 percent of original size [2021-05-22 02:35:18,378 INFO L518 ElimStorePlain]: Eliminatee v_prenex_384 vanished before elimination [2021-05-22 02:35:18,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:18,381 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,398 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:18,398 INFO L518 ElimStorePlain]: Eliminatee v_prenex_386 vanished before elimination [2021-05-22 02:35:18,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:18,401 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:18,415 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:18,415 INFO L518 ElimStorePlain]: Eliminatee v_prenex_388 vanished before elimination [2021-05-22 02:35:18,415 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:18,415 INFO L518 ElimStorePlain]: Eliminatee v_prenex_383 vanished before elimination [2021-05-22 02:35:18,417 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:35:18,417 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 12 variables, input treesize:120, output treesize:14 [2021-05-22 02:35:18,433 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:18,433 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472864342] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:18,433 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:18,433 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:18,433 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596563977] [2021-05-22 02:35:18,433 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:18,433 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:18,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:18,433 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:18,434 INFO L87 Difference]: Start difference. First operand 434 states and 1337 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:18,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:18,732 INFO L93 Difference]: Finished difference Result 553 states and 1645 transitions. [2021-05-22 02:35:18,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-22 02:35:18,732 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:18,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:18,733 INFO L225 Difference]: With dead ends: 553 [2021-05-22 02:35:18,733 INFO L226 Difference]: Without dead ends: 518 [2021-05-22 02:35:18,733 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 313.5ms TimeCoverageRelationStatistics Valid=122, Invalid=384, Unknown=0, NotChecked=0, Total=506 [2021-05-22 02:35:18,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 518 states. [2021-05-22 02:35:18,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 518 to 446. [2021-05-22 02:35:18,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 446 states, 445 states have (on average 3.0719101123595505) internal successors, (1367), 445 states have internal predecessors, (1367), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:18,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 446 states to 446 states and 1367 transitions. [2021-05-22 02:35:18,737 INFO L78 Accepts]: Start accepts. Automaton has 446 states and 1367 transitions. Word has length 22 [2021-05-22 02:35:18,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:18,737 INFO L482 AbstractCegarLoop]: Abstraction has 446 states and 1367 transitions. [2021-05-22 02:35:18,737 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:18,737 INFO L276 IsEmpty]: Start isEmpty. Operand 446 states and 1367 transitions. [2021-05-22 02:35:18,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:18,738 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:18,738 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:18,938 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1131 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6571 [2021-05-22 02:35:18,939 INFO L430 AbstractCegarLoop]: === Iteration 1143 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:18,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:18,939 INFO L82 PathProgramCache]: Analyzing trace with hash 497903530, now seen corresponding path program 1131 times [2021-05-22 02:35:18,939 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:18,939 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1515658657] [2021-05-22 02:35:18,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:18,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:19,012 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:19,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:19,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1515658657] [2021-05-22 02:35:19,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1515658657] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:19,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [685371128] [2021-05-22 02:35:19,012 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1132 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:19,038 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-22 02:35:19,038 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:19,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:19,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:19,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:19,162 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:19,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:19,163 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,166 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:19,167 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,168 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:19,169 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,171 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:19,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:19,172 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,189 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:19,191 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-1 vars, End of recursive call: 2 dim-0 vars, and 3 xjuncts. [2021-05-22 02:35:19,191 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 2 variables, input treesize:105, output treesize:58 [2021-05-22 02:35:19,251 INFO L446 ElimStorePlain]: Different costs {0=[o_2, v_prenex_392, v_prenex_393, o_4, v_prenex_395, v_prenex_397], 1=[v_prenex_394, v_prenex_396]} [2021-05-22 02:35:19,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:19,256 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,302 INFO L628 ElimStorePlain]: treesize reduction 40, result has 64.0 percent of original size [2021-05-22 02:35:19,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:19,306 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,324 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:19,324 INFO L518 ElimStorePlain]: Eliminatee v_prenex_393 vanished before elimination [2021-05-22 02:35:19,324 INFO L518 ElimStorePlain]: Eliminatee o_4 vanished before elimination [2021-05-22 02:35:19,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:19,327 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:19,357 INFO L628 ElimStorePlain]: treesize reduction 9, result has 81.3 percent of original size [2021-05-22 02:35:19,357 INFO L518 ElimStorePlain]: Eliminatee v_prenex_397 vanished before elimination [2021-05-22 02:35:19,357 INFO L518 ElimStorePlain]: Eliminatee v_prenex_394 vanished before elimination [2021-05-22 02:35:19,357 INFO L518 ElimStorePlain]: Eliminatee v_prenex_396 vanished before elimination [2021-05-22 02:35:19,359 INFO L550 ElimStorePlain]: Start of recursive call 1: 4 dim-0 vars, 8 dim-1 vars, End of recursive call: and 4 xjuncts. [2021-05-22 02:35:19,359 INFO L247 ElimStorePlain]: Needed 4 recursive calls to eliminate 12 variables, input treesize:120, output treesize:14 [2021-05-22 02:35:19,375 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:19,375 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [685371128] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:19,375 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:19,375 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:19,375 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387253088] [2021-05-22 02:35:19,376 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:19,376 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:19,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:19,376 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:19,376 INFO L87 Difference]: Start difference. First operand 446 states and 1367 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:19,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:19,613 INFO L93 Difference]: Finished difference Result 514 states and 1543 transitions. [2021-05-22 02:35:19,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:19,614 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:19,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:19,614 INFO L225 Difference]: With dead ends: 514 [2021-05-22 02:35:19,614 INFO L226 Difference]: Without dead ends: 477 [2021-05-22 02:35:19,614 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 268.4ms TimeCoverageRelationStatistics Valid=94, Invalid=286, Unknown=0, NotChecked=0, Total=380 [2021-05-22 02:35:19,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-05-22 02:35:19,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 432. [2021-05-22 02:35:19,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 432 states, 431 states have (on average 3.0904872389791183) internal successors, (1332), 431 states have internal predecessors, (1332), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:19,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 432 states to 432 states and 1332 transitions. [2021-05-22 02:35:19,619 INFO L78 Accepts]: Start accepts. Automaton has 432 states and 1332 transitions. Word has length 22 [2021-05-22 02:35:19,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:19,619 INFO L482 AbstractCegarLoop]: Abstraction has 432 states and 1332 transitions. [2021-05-22 02:35:19,619 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:19,619 INFO L276 IsEmpty]: Start isEmpty. Operand 432 states and 1332 transitions. [2021-05-22 02:35:19,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:19,619 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:19,619 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:19,820 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6585,1132 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:19,820 INFO L430 AbstractCegarLoop]: === Iteration 1144 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:19,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:19,820 INFO L82 PathProgramCache]: Analyzing trace with hash 1416536082, now seen corresponding path program 1132 times [2021-05-22 02:35:19,820 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:19,820 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1709158818] [2021-05-22 02:35:19,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:19,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:19,894 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:19,894 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:19,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1709158818] [2021-05-22 02:35:19,894 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1709158818] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:19,894 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [576934363] [2021-05-22 02:35:19,894 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1133 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:19,919 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-05-22 02:35:19,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:19,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 18 conjunts are in the unsatisfiable core [2021-05-22 02:35:19,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:20,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:20,025 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,027 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-05-22 02:35:20,028 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:20,031 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,032 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:20,033 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,048 INFO L628 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2021-05-22 02:35:20,049 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:35:20,049 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 1 variables, input treesize:109, output treesize:57 [2021-05-22 02:35:20,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2021-05-22 02:35:20,109 INFO L550 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:20,114 INFO L550 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,116 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:20,117 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:20,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 18 [2021-05-22 02:35:20,118 INFO L550 ElimStorePlain]: Start of recursive call 4: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,120 INFO L173 IndexEqualityManager]: detected equality via solver [2021-05-22 02:35:20,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2021-05-22 02:35:20,121 INFO L550 ElimStorePlain]: Start of recursive call 5: End of recursive call: and 1 xjuncts. [2021-05-22 02:35:20,140 INFO L628 ElimStorePlain]: treesize reduction 42, result has 26.3 percent of original size [2021-05-22 02:35:20,141 INFO L518 ElimStorePlain]: Eliminatee o_2 vanished before elimination [2021-05-22 02:35:20,141 INFO L550 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-1 vars, End of recursive call: and 3 xjuncts. [2021-05-22 02:35:20,141 INFO L247 ElimStorePlain]: Needed 5 recursive calls to eliminate 3 variables, input treesize:97, output treesize:6 [2021-05-22 02:35:20,158 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:20,158 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [576934363] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:20,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-22 02:35:20,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 15 [2021-05-22 02:35:20,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [830525310] [2021-05-22 02:35:20,158 INFO L462 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-22 02:35:20,158 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-22 02:35:20,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-22 02:35:20,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2021-05-22 02:35:20,158 INFO L87 Difference]: Start difference. First operand 432 states and 1332 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:20,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-22 02:35:20,467 INFO L93 Difference]: Finished difference Result 557 states and 1654 transitions. [2021-05-22 02:35:20,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-22 02:35:20,467 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-05-22 02:35:20,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-22 02:35:20,468 INFO L225 Difference]: With dead ends: 557 [2021-05-22 02:35:20,468 INFO L226 Difference]: Without dead ends: 522 [2021-05-22 02:35:20,468 INFO L777 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 16 SyntacticMatches, 3 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 337.6ms TimeCoverageRelationStatistics Valid=105, Invalid=315, Unknown=0, NotChecked=0, Total=420 [2021-05-22 02:35:20,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2021-05-22 02:35:20,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 448. [2021-05-22 02:35:20,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 3.0738255033557045) internal successors, (1374), 447 states have internal predecessors, (1374), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:20,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 1374 transitions. [2021-05-22 02:35:20,473 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 1374 transitions. Word has length 22 [2021-05-22 02:35:20,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-22 02:35:20,473 INFO L482 AbstractCegarLoop]: Abstraction has 448 states and 1374 transitions. [2021-05-22 02:35:20,473 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 15 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-22 02:35:20,473 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 1374 transitions. [2021-05-22 02:35:20,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-05-22 02:35:20,473 INFO L513 BasicCegarLoop]: Found error trace [2021-05-22 02:35:20,473 INFO L521 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-22 02:35:20,674 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6605,1133 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:20,674 INFO L430 AbstractCegarLoop]: === Iteration 1145 === [ULTIMATE.startErr0ASSERT_VIOLATIONASSERT]=== [2021-05-22 02:35:20,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-22 02:35:20,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1192039374, now seen corresponding path program 1133 times [2021-05-22 02:35:20,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-22 02:35:20,674 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772001102] [2021-05-22 02:35:20,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-22 02:35:20,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-22 02:35:20,761 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-22 02:35:20,761 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-22 02:35:20,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772001102] [2021-05-22 02:35:20,761 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772001102] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-22 02:35:20,761 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601779271] [2021-05-22 02:35:20,761 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1134 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-22 02:35:20,788 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 3 check-sat command(s) [2021-05-22 02:35:20,788 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-22 02:35:20,788 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-22 02:35:20,789 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-22 02:35:20,853 WARN L348 FreeRefinementEngine]: Global settings require throwing the following exception [2021-05-22 02:35:21,060 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 1134 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6612 [2021-05-22 02:35:21,061 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.NullPointerException at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.derSimple(XnfDer.java:308) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate_EqInfoBased(XnfDer.java:138) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.XnfDer.tryToEliminate(XnfDer.java:101) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.elim(PartialQuantifierElimination.java:255) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.PartialQuantifierElimination.tryToEliminate(PartialQuantifierElimination.java:100) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer$QuantifierEliminationPostprocessor.postprocess(IterativePredicateTransformer.java:246) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.applyPostprocessors(IterativePredicateTransformer.java:440) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.predicates.IterativePredicateTransformer.computeStrongestPostconditionSequence(IterativePredicateTransformer.java:201) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolantsUsingUnsatCore(TraceCheckSpWp.java:299) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.computeInterpolants(TraceCheckSpWp.java:185) at de.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.singletracecheck.TraceCheckSpWp.(TraceCheckSpWp.java:163) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:108) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSpWp.construct(IpTcStrategyModuleSpWp.java:1) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:297) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:190) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:180) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:439) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:374) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:69) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:63) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:371) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:307) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseConcurrentProgram(TraceAbstractionStarter.java:236) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-05-22 02:35:21,064 INFO L168 Benchmark]: Toolchain (without parser) took 866853.79 ms. Allocated memory was 350.2 MB in the beginning and 528.5 MB in the end (delta: 178.3 MB). Free memory was 329.0 MB in the beginning and 215.3 MB in the end (delta: 113.8 MB). Peak memory consumption was 292.6 MB. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 350.2 MB. Free memory was 330.3 MB in the beginning and 330.2 MB in the end (delta: 65.8 kB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L168 Benchmark]: Boogie Procedure Inliner took 27.69 ms. Allocated memory is still 350.2 MB. Free memory was 329.0 MB in the beginning and 327.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L168 Benchmark]: Boogie Preprocessor took 17.90 ms. Allocated memory is still 350.2 MB. Free memory was 327.5 MB in the beginning and 326.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L168 Benchmark]: RCFGBuilder took 462.65 ms. Allocated memory is still 350.2 MB. Free memory was 326.4 MB in the beginning and 329.1 MB in the end (delta: -2.7 MB). Peak memory consumption was 21.4 MB. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L168 Benchmark]: TraceAbstraction took 866341.15 ms. Allocated memory was 350.2 MB in the beginning and 528.5 MB in the end (delta: 178.3 MB). Free memory was 328.1 MB in the beginning and 215.3 MB in the end (delta: 112.8 MB). Peak memory consumption was 290.0 MB. Max. memory is 16.0 GB. [2021-05-22 02:35:21,064 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.12 ms. Allocated memory is still 350.2 MB. Free memory was 330.3 MB in the beginning and 330.2 MB in the end (delta: 65.8 kB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Procedure Inliner took 27.69 ms. Allocated memory is still 350.2 MB. Free memory was 329.0 MB in the beginning and 327.5 MB in the end (delta: 1.5 MB). There was no memory consumed. Max. memory is 16.0 GB. * Boogie Preprocessor took 17.90 ms. Allocated memory is still 350.2 MB. Free memory was 327.5 MB in the beginning and 326.5 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.0 GB. * RCFGBuilder took 462.65 ms. Allocated memory is still 350.2 MB. Free memory was 326.4 MB in the beginning and 329.1 MB in the end (delta: -2.7 MB). Peak memory consumption was 21.4 MB. Max. memory is 16.0 GB. * TraceAbstraction took 866341.15 ms. Allocated memory was 350.2 MB in the beginning and 528.5 MB in the end (delta: 178.3 MB). Free memory was 328.1 MB in the beginning and 215.3 MB in the end (delta: 112.8 MB). Peak memory consumption was 290.0 MB. Max. memory is 16.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: NullPointerException: null de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: NullPointerException: null: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.EqualityInformation.getEqinfo(EqualityInformation.java:130) RESULT: Ultimate could not prove your program: Toolchain returned no result. Received shutdown request...